REL Acoustics Q Series User manual

Operating Instructions
for the
Q
Range
of
SUB-BASS SYSTEMS
REL Acoustics Limited
North Road, Bridgend industrial Estate
Bridgend, CF31 3TP
United Kingdom
Telephone: [phone]
Fax: [phone]
Web: www.REL.net

REL Acoustics ‘Q’ range User manual
2
First Printed March 12th 2003

REL Acoustics ‘Q’ range User manual
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Contents
CONTENTS.................................................................................................................................................................3
IMPORTANT SAFEGUARDS................................................................................................................................4
WARNING...................................................................................................................................................................4
WELCOME.................................................................................................................................................................5
WORLD WIDE WARRANTY.................................................................................................................................5
SERVICE AFTER WARRANTY...........................................................................................................................5
DESIGN SAFETY......................................................................................................................................................6
IMPORTANT...........................................................................................................................................................6
INTRODUCTION TO ‘Q’ RANGE SUB BASS SYSTEMS...............................................................................7
CONTROLS AND CONNECTIONS - QUAKE...............................................................................................8
CONTROLS AND CONNECTIONS - Q108 US MARKET ONLY..............................................................9
CONTROLS AND CONNECTIONS - Q150E................................................................................................10
CONTROLS AND CONNECTIONS- Q200E, Q201E, Q400E .......................................................................11
CONNECTING UP..................................................................................................................................................12
TO CONNECT TO THE POWER AMPLIFIER USING THE UNBALANCED NEUTRIK HIGH LEVEL INPUT.................13
TO CONNECT TO THE AMPLIFIER/PROCESSOR USING THE PHONO TO PHONO LOW LEVEL INTERCONNECT..........14
MODE SELECTOR.................................................................................................................................................15
Q108 CONTROLS....................................................................................................................................................15
REL SET-UP MADE SIMPLE..............................................................................................................................16
REL SET-UP MADE SIMPLER...........................................................................................................................19
RUNNING IN............................................................................................................................................................20
CARE AND POLISHING.......................................................................................................................................20
TECHNICAL.............................................................................................................................................................21
OVERLOAD PROTECTION.................................................................................................................................21
POWER SAVING EFFICIENCY..........................................................................................................................22
SPECIFICATIONS..................................................................................................................................................23
SPECIFICATIONS (CONT.).................................................................................................................................24

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IMPORTANT SAFEGUARDS
1. Read all of these instructions.
2. Save these instructions for future use.
3. Unplug from the wall socket before cleaning. Do not use liquid cleaners or aerosol cleaners.
Use a damp cloth for cleaning.
4. Do not use near water.
5. Do not place on a stand or table, it may fall causing injury to a child or adult, and damage to the
unit.
6. The unit should only be operated from the power source indicated on the panel of the amplifier.
7. Only use the power cord supplied.
8. Do not allow anything to rest on the power cord. Position the power cord such that it can not be
walked on.
9. For added protection during a lightening storm, or when not in use for long periods of time,
unplug it from the wall socket.
10. Never spill any kind of liquid on the unit.
11. Do not attempt to service the unit yourself, as removing the amplifier may expose you to
dangerous voltages. Refer all servicing to your dealer.
12. Unplug the unit from the wall socket and refer servicing to your dealer under the following
conditions:
a. When the power cord or plug is damaged.
b. If liquid has been spilled onto the unit.
c. If the unit does not operate properly by following the operating instructions.
d. If the unit has been dropped and damaged.
e. When the unit exhibits a drastic change in performance.
WARNING
This item is heavy. To avoid risk of injury, take care when handling.

REL Acoustics ‘Q’ range User manual
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WELCOME
Thank you for buying a REL “Q” range Sub-Bass system. Our “Q” range is carefully hand built using
the finest materials available and is designed for maximum performance. This manual contains
important safety information as well as helpful advice and should be carefully studied before
connecting up.
WORLD WIDE WARRANTY
In addition to any local Warranty, REL offer a 3-year conditional Worldwide Warranty to the end user.
It is done in collaboration with our Distributors.
The conditions of this Warranty are:
1. That REL receive the necessary registration details from the end user.
2. That these details are received within six weeks of purchase.
3. That the product is not exported from the country of purchase for at least eight weeks after
purchase.
4. That any claim is accompanied by the necessary proof of purchase.
5. That it shall be for a term of 3 years from the date of purchase.
6. That the product has not been abused or modified in any way.
7. That it was purchased originally from a REL authorised dealer.
This Warranty is offered in good faith and is in addition to any statuary rights or existing Warranty that
may be available to the end user.
Should your REL Sub Bass Unit give you a problem, please contact your dealer who will be able to
make whatever arrangements are necessary to correct it.
SERVICE AFTER WARRANTY
Please contact your dealer in the first instance before returning any product directly to us. Should the
unit need to be returned for any reason, all carriage costs will be payable by the customer. Losses or
damage caused during transit are the customer's risk.

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DESIGN SAFETY
This apparatus is designed to Class II specification and is double insulated,
therefore it does not require to be earthed.
This apparatus is supplied with a fitted mains plug. For UK operation a 5 Amp fuse is fitted in the
plug. Should the fuse need to be replaced use a similar rated fuse approved to ASTA or BSI 362.
Do not use without the fuse cover in place. Replacement fuse covers are available from your dealer.
If for any reason the plug is cut off it must NOT be re used. Please dispose of any such plug safely.
There is a danger of electric shock if the cut off plug is inserted into a mains socket.
IMPORTANT
The wires in the mains lead are coloured in accordance with the following code:
Green and Yellow -Earth
Blue -Neutral
Brown -Live
As the colours of the wires in the mains lead may not correspond with the markings identifying the
terminals in the replacement mains plug, proceed as follows:
- The wire coloured Green and Yellow must be connected to the terminal marked with the
letter "E" or with the earth symbol
- The wire coloured Blue must be connected to the terminal marked with the letter "N"
- The wire coloured Brown must be connected to the terminal marked with the letter “L"
This product is CE marked and has been tested to ensure it satisfies all relevant standards.
It satisfies all relevant standards for Conducted Emissions, Radiated Emissions, Susceptibility and
Immunity.
It also complies with the requirements relating to class II construction detailed in clauses 9 & 10 of BS
EN 60065 1994
It also satisfies all relevant safety tests for consumer use provided it is used within the guidelines of
this manual.

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Main Features of REL Quake, Q108 (US ONLY), Q150E, Q200E, Q201E and
Q400E
1. High level input and low level input. Also PC input on Quake and Q108
2. Separate volume controls for high level and low level inputs
3. Variable filter roll off control
4. Mode switch to control phase and low level filter bypass (Not on Q108)
5. All components of matching superior quality to achieve both long life and long term consistency
of sound quality
6. Superior wood veneered finishes available for Quake and Q201E
7. Set-Safe® circuitry ensuring ultimate protection if overloaded.
INTRODUCTION TO ‘Q’ RANGE SUB BASS SYSTEMS
Many or most loudspeakers designed to reproduce low bass are specifically designed to emphasize
the mid bass. This is the range from 30 to 70 Hertz. We at REL believe this is wrong. All of our
designs are true sub bass systems, meaning they are designed to reproduce those very low
frequencies that are felt rather than heard. This is because we believe that music is full range, as are
sound effects on movies, and we intend our products to reproduce all of these sounds, not a narrow
band.
The “Q” range models are equipped to allow you to take full advantage of AC3, Dolby Digital, DTS,
MPEG 2 and any other digital sound format that includes a dedicated Low Frequency Effects (LFE)
channel.
The dedicated LFE input meets the tough specification laid down for digital 3/2.1 channels, usually
known as 5.1. The output is nominally flat from 25Hz - 120hz. It has a dedicated input level control
which enables users to set the LFE level independently of the processor. This is important because
not all processors offer control over this significant parameter. The LFE channel is typically recorded
at 10db higher levels than the other channels.
The “Q” range also has standard speaker level inputs with their own input level control. Uniquely,
both the speaker level and the LFE input can be used simultaneously. This means you can set it up
for an audiophile sound with your CD’s or other stereo signals and instantly revert to using the Sub-
Bass System as the dedicated LFE component when watching movies. This is a feature of real
benefit if you wish to play music in stereo mode in the purist audiophile way and in full 5.1 digital
mode. True flexibility!
On two models there is a ‘Slam’ and ‘Depth’ selector, (Q150E and QUAKE). 'Slam' mode allows you
to choose a higher output level at 40Hz - 150Hz at the expense of maximum bass extension. This is
an excellent ‘party’ mode where subtlety and ultimate fidelity is secondary.
Alternatively the standard ‘Depth’ mode 20Hz - 100Hz provides maximum bass extension and is
strongly recommended where the highest possible fidelity is demanded. This is ideal for people in
pursuit of the absolutely highest fidelity.
See the specification table on pages 18 and 19 for features of the various models.

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CONTROLS AND CONNECTIONS - QUAKE
12 3 4 5
6
7
8
9
1 Slam/Depth switch. Changes the characteristics of the filter/roll off. Depth mode 20 – 100 Hz
Slam mode bass emphasised 50 – 150 Hz. ONLY FITTED TO QUAKE AND Q150E
2 Roll off control. Adjust to set the upper roll off frequency of the Sub Bass System.
3 MODE SWITCH. Used to set phase* and to bypass crossover for Low Level input**.
Position 1 / Line: 0 degrees phase, crossover engaged low level input
Position 2 / LFE: 0 degrees phase, crossover bypassed for low level input
Position 3 / Line: 180 degrees phase, crossover engaged for low level input
Position 4 / LFE: 180 degrees phase, crossover bypassed for low level input
*PHASE SELECTION AFFECTS BOTH HI AND LO LEVEL INPUTS
**Crossover is always engaged for Hi level input regardless of mode switch position.
4 LO LEVEL input volume control. Adjust for output level when using LO LEVEL phono input
or balanced line level input XLR socket.
5HI LEVEL input volume control. Adjust for output level when using HI INPUT Neutrik socket or
BAL HI INPUT Neutrik socket.
6 PC input 3.5mm jack socket. Used to connect the Sub Bass System to a computer.
7. LFE input phono socket. Used to connect the Sub Bass System to the LFE/Sub output of a
5.1 channel amplifier or processor.
8. HI LEVEL input Neutrik Speakon socket. Used to connect the Sub Bass System to the main
front speaker terminals on the amplifier.
9 IEC Mains input socket.
MAX
MIN
LO LEVEL
MAX
MIN
106HZ
26HZ
HI LEVEL
ROLLOFF
POWER
41HZ
1
2
3
4
MODE
SLAM
DEPTH
CONTOUR
HI LEVEL
LFE
PC
CE
QUAKE
SOURCE
1
2
3
4
LINE
LFE
LINE
LFE
PHASE
0
0
180
deg
180
deg
MODE
SELECTOR
FUSE 2 A/T
~ 220-240 VAC 50-60
HZ
100 WATT MOSFET
SUB-BASS SPEAKER SYSTEM
PROTECTED BY
R
REL ACOUSTICS
LTD NORTH ROAD BRIDGEND CF31 3TP UNITED KINGDOM
http://REL.net
FAX: [phone]

REL Acoustics ‘Q’ range User manual
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MAX
MIN
LO LEVEL
MAX
MIN
106HZ
26HZ
HI LEVEL
CROSS OVER
POWER
41HZ
IN
OUT
XOVER
HI LEVEL
LFE
PC
CE
Q108
FUSE 3.15 A/T
~ 110-120 VAC 50-60 HZ
100 WATT MOSFET
SUB-BASS SPEAKER SYSTEM
PROTECTED BY
R
REL ACOUSTICS
LTD NORTH ROAD BRIDGEND CF31 3TP UNITED KINGDOM
http://REL.net
FAX: [phone]
0
180
PHASE
CONTROLS AND CONNECTIONS - Q108 US MARKET ONLY
1 2 3 4 5
6
7
8
9
1 PHASE switch 0 and 180 degrees. Phase selection affects both high and low level inputs.
2 CROSS OVER. Adjust to set the roll off frequency of the sub bass system.
3XOVER. Switches the CROSS OVER in or out. Only affects LFE input, always active for
high level input.
4LO LEVEL input volume control. Adjust for output level when using LO LEVEL phono input.
5 HI LEVEL input volume control. Adjust for output level when using HI LEVEL Neutrik input.
6 PC. Low level input 3.5mm jack socket. Used to connect the Sub Bass System to a
computer.
7 LFE input phono socket. Used to connect the Sub Bass System to the LFE/Sub output of a
5.1 channel amplifier or processor.
8 HI LEVEL input Neutrik Speakon socket. Used to connect the Sub Bass System to the main
front speaker terminals on the amplifier.
9IEC Mains input socket.

REL Acoustics ‘Q’ range User manual
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CONTROLS AND CONNECTIONS - Q150E
LO LEVEL input volume control. Adjust for output level when using LO LEVEL phono input.
HI LEVEL input volume control. Adjust for output level when using HI LEVEL Neutrik input.
Roll off control. Adjust to set the upper roll off frequency of the Sub Bass System.
MODE SWITCH. Used to set phase* and to bypass crossover for Low Level input**.
Position 1 / Line: 0 degrees phase, crossover engaged low level input
Position 2 / LFE: 0 degrees phase, crossover bypassed for low level input
Position 3 / Line: 180 degrees phase, crossover engaged for low level input
Position 4 / LFE: 180 degrees phase, crossover bypassed for low level input
*PHASE SELECTION AFFECTS BOTH HI AND LO LEVEL INPUTS
**Crossover is always engaged for Hi level input regardless of mode switch position.
SLAM/DEPTH switch. Changes the characteristics of the filter/roll off. Depth mode 20 – 100 Hz.
Slam mode bass emphasised 50 – 150 Hz. ONLY FITTED TO QUAKE AND Q150E
HI LEVEL input Neutrik Speakon socket. Used to connect the sub woofer at high level to the main
speaker terminals on the amplifier using the supplied interconnect.
LO LEVEL input phono sockets. Used to connect the sub woofer at low level to the SUB/LFE
output of the processor/amplifier or spare pre amplifier outputs.
Ground switch. Used to provide a physical earth connection to the sub if necessary. Not fitted to
Q400E (Q401E) and later Quake models.
IEC Mains input socket.
MIN
LO LEVEL
MAX
MIN
106HZ
26HZ
HI LEVEL
ROLLOFF
POWER
32HZ
41HZ
59HZ
1
2
3
4
MODE
SLAM
DEPTH
CONTOUR
HI LEVEL
LO LEVEL
0dB
+12dB
CE
Q150E
SOURCE
1
2
3
4
LINE
LFE
LINE
LFE
PHASE
0
0
180 deg
180 deg
MODE SELECTOR
FUSE 2 A/T
~ 220-240 VAC 50-60 HZ
1
5
0
W
A
T
T
M
O
F
S
U
B
-
B
A
S
S
S
P
E
A
K
E
R
S
Y
S
E
M
P
R
O
T
E
C
T
E
D
B
Y
REL ACOUSTICS
LTD NORTH ROAD BRIDGEND CF31 3TP UNITED KINGDOM
http://REL.net
GROUND
OUT
IN
FAX: [phone]
LO INPUT
0dB
+12dB
1
2
3
4
5
6
7
8
9
2
3
4
6
7
8
9
1
5

REL Acoustics ‘Q’ range User manual
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CONTROLS AND CONNECTIONS- Q200E, Q201E, Q400E
7
LO LEVEL input volume control. Adjust for output level when using LO LEVEL phono input.
HI LEVEL input volume control. Adjust for output level when using HI LEVEL Neutrik input.
Roll off control. Adjust to set the upper roll off frequency of the Sub Bass System.
MODE SWITCH. Used to set phase* and to bypass crossover for Low Level input**.
Position 1 / Line: 0 degrees phase, crossover engaged low level input
Position 2 / LFE: 0 degrees phase, crossover bypassed for low level input
Position 3 / Line: 180 degrees phase, crossover engaged for low level input
Position 4 / LFE: 180 degrees phase, crossover bypassed for low level input
*PHASE SELECTION AFFECTS BOTH HI AND LO LEVEL INPUTS
**Crossover is always engaged for Hi level input regardless of mode switch position.
0dB LO INPUT phono socket. Used to connect the Sub Bass System at low level to the sub/LFE
output of the amplifier/processor or left and right pre-amp outputs.
If Lo Level inputs are used to connect pre-amp right and left outputs then a 12dB attenuator is
available from REL to balance the two inputs.
Alternatively, a high quality Y-adaptor may be employed to connect at either input as system gain
characteristics demand.
+12dB LO INPUT phono socket . As 6 but a higher sensitivety. If LO LEVEL inputs are used
connected to pre-amp right and left outputs then a 12 dB attenuator is available from REL to
balance the two inputs.
Alternatively, a high quality Y-adaptor may be employed to connect at either input as system gain
characteristics demand.
UNBAL HI INPUT Neutrik Speakon socket. Used to connect the Sub Bass System at high level
to the main speaker output of amplifiers.
IEC Mains input socket
1
2
3
4
5
6
MAX
MIN
LO LEVEL
MAX
MIN
106HZ
26HZ
1
2
3
4
HI LEVEL
ROLLOFF
MODE
SOURCE
1
2
3
4
LINE
LFE
LINE
LFE
PHASE
0
0
180 deg
180 deg
MODE SELECTOR
LO LEVEL
0dB
+12dB
Q200E
CE
FUSE 2 A/T
~ 220-240 VAC 50-60 HZ
HI LEVEL
POWER
32HZ
41HZ
59HZ
R
200 WATT MOSFET
SUB-BASS SPEAKER SYSTEM
PROTECTED BY
REL ACOUSTICS
LTD NORTH ROAD BRIDGEND CF31 3TP UNITED KINGDOM
http://REL.net
FAX: [phone]
8
2
3
4
1
5
6
7
8

REL Acoustics ‘Q’ range User manual
12
CONNECTING UP
Always switch off your system before disconnecting any wires
To increase the versatility of connecting up, the “Q” range has two separate inputs. A Neutrik
Speakon socket and a pair of phono sockets. (single phono socket on Quake and Q108). As
mentioned, this is to facilitate use with both two channel stereo systems and AV surround sound
systems.
The high level, unbalanced, dual channel (stereo) input is via a Neutrik Speakon connector which is
connected to the power amplifier’s left and right channel speaker terminals. This has the advantage
of ensuring that the REL receives exactly the same signal as the main speakers. This means that the
character of the bass from the main system is carried forward into the sub-bass. This is a very
important point and together with the REL’s Active Bass Controller (ABC), ensures far superior
system integration of the sub-bass with the main system.
The low level input is via phono connectors and connects to the Sub/LFE output of the
amplifier/processor. Two inputs are available, 0dB and +12dB, (Single phono input on Quake and
Q108 at +12dB), it is usual to use the 0dB input but if the Sub/LFE output level of the
amplifier/processor is a little low then the higher sensitivity +12dB input can be used.
If the main speakers are active then again the low level input must be used and connected to the pre
amplifier outputs. Because the low level inputs are 0dB and +12dB an attenuator is necessary to
balance the two inputs, Quake and Q108 are not suitable for this method of connection as it
only has a single channel low level input.
Quake and Q108 also have an input for connection to a PC, this is via a 3.5mm jack socket
HI LEVEL and LO LEVEL inputs can be used simultaneously. The benefits are two-fold when used
with a home cinema system. The low level input reproduces the .1 Sub/LFE channel and the high
level connection underpins the main front speakers. The main front speakers should be set to the
‘large’ option on the processor. See “SETTING UP”

REL Acoustics ‘Q’ range User manual
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To connect to the power amplifier using the UNBALANCED Neutrik high level
input.
To engage the Neutrik Speakon plug, insert fully into socket and rotate clockwise until locked.
To remove the Neutrik Speakon plug, grip body of plug, place thumb on chrome lever, move lever
backwards rotate plug anti-clockwise (counter-clockwise in the US) quarter turn and withdraw.
The high level input is designed to accept the stereo (two channel) signals from the speaker
terminals of your receiver, integrated amplifier, and basic amplifiers. This has the advantage of
ensuring that your subwoofer receives exactly the same signal as the main speakers, which means
that the character of the bass from the main system is carried forward into the sub-bass. This is a
very important point and together with the REL’s ABC circuitry, ensures far superior system
integration of the sub-bass with the main system.
**Supplied Neutrik Speakon High level Interconnect
HI LEVEL input RELease lever YELLOW + - + -
BLACK L R
RED Amplifier main speaker outputs
** NOT SUPPLIED WITH QUAKE
High Level connections should be made to the same binding posts as the main speakers.
Connect as shown above. Red to amplifier main right speaker red terminal, yellow to amplifier main
left speaker red terminal and black to amplifier main speaker black terminal, right or left but not both.
Plug the Neutrik Speakon plug into the HI LEVEL Neutrik socket.
The output level is adjusted using the control marked HI LEVEL.

REL Acoustics ‘Q’ range User manual
14
To connect to the amplifier/processor using the phono to phono low level
interconnect
Two low level inputs are provided, 0dB and +12dB, One only on Quake and Q108 at +12dB
Connect as shown above. Although a twin phono to phono interconnect is supplied, only one core
need be used, either the red or the black. Plug one end into the sub/LFE output on the
amplifier/processor and the other end into the 0dB input (single input on Quake and Q108) on the sub
woofer.
On the models with two low level phono inputs, if the output is too low when using the 0dB input then
use the more sensitive +12 dB input.
The output level is adjusted using the control marked LO LEVEL
If the low level connection is to be made to left and right pre-amp outputs then a 12dB attenuator is
available to balance the 0dB and +12dB phono inputs. See below.
One Q108 not suitable for this type of connection. Two Q108 units would be required.
Supplied Phono to Phono Interconnect. To sub/LFE output of
Amplifier/Processor
Sub Low Level
Input. (One phono
Only on Quake and Q108)
.
Sub Low Level 12dB Supplied phono to phono
Input Attenuator interconnect

REL Acoustics ‘Q’ range User manual
15
MODE SELECTOR
(NOT APPLICABLE TO Q108)
POSITION SOURCE PHASE
1LINE 0
2LFE 0
3LINE 180 DEG
4LFE 180 DEG
The mode switch is a dual function control, it can reverse the phase for both high level and low level
inputs and it can bypass the internal filter/roll off.
Phase reversal is rarely needed but can be useful as explained in “SETTING UP” .
MODE SWITCH. Used to set phase* and to bypass crossover for Low Level input**.
Position 1 / Line: 0 degrees phase, crossover engaged low level input
Position 2 / LFE: 0 degrees phase, crossover bypassed for low level input
Position 3 / Line: 180 degrees phase, crossover engaged for low level input
Position 4 / LFE: 180 degrees phase, crossover bypassed for low level input
*PHASE SELECTION AFFECTS BOTH HI AND LO LEVEL INPUTS.
**Crossover is always engaged for Hi level input regardless of mode switch position,
bypassing is only possible for the low level input.
Q108 CONTROLS
On the Q108, US model, the MODE SWITCH has been replaced with two separate controls namely
phase and LFE XOVER.
The PHASE switch has two positions, 0 and 180 degrees.
The LFE XOVER switch is marked IN/OUT. At its IN position the CROSSOVER control is active. At
its OUT position the CROSSOVER control is bypassed. This means that the Q108 will reproduce the
full range of the LFE/SUB output of the amplifier/processor, or the limit can be set on the processor if
it has this facility.
The CROSSOVER is always active for the HI LEVEL input.
Other controls are the same as for Quake.

REL Acoustics ‘Q’ range User manual
16
REL Set-Up Made Simple
REL products are not traditional subwoofers, but true sub-bass systems. A REL is designed to
augment the performance of “full range” speaker systems, to provide linear response down to below
12 Hz (Studio III, -6 dB down at 9 Hz). Therefore, for the moment, set aside everything you’ve been
taught about subwoofers and how they are integrated into a stereo or theatre system. REL sub bass
systems set-up and positioning differs from other subwoofers. A REL will take advantage of physics
and room acoustics to provide deep pressurisation as no other sub-woofer can. It’s important that you
bring to the set-up process a willingness to do things a little differently in order to obtain these
superior results. The end result of your labours will be an utterly seamless integration of true deep
bass to a sound system, regardless of the main speakers low bass capability.
Two Things Before You Begin
A. It is helpful to know that you will almost always connect the REL to the input on the rear
panel labelled “Hi Level.” This connection is made using the supplied 34’ 10” (10 meters)
cable, the bare leads of which connect to the speaker output terminals of the power amplifier.
The easy and foolproof connection at the REL is done with a Neutrik Speakon connector.
The purpose of connecting to the speaker output terminals is one of the unique secrets of
REL’s success. By connecting to the high level input on the REL from the amplifier, you build
forward the sonic signature of your main system, including the tonal balance and timing cues
of the entire electronics chain. In this way, the REL is fed the exact signal that is fed to the
main speakers.
B. When possible, the REL should be placed in one of the corners behind the speakers.
Remember, we are dealing with true LOW bass pressurisation with RELs, not the mid-bass
that most competitors settle for. Low bass pressurisation below 40Hz is best derived from
corner placement, where the most linear and efficient low bass can be produced.
Basic set-up should take no more than ten to fifteen minutes to accomplish once connected.
Connecting
High-level connection, using the enclosed cable with the Neutrik Speakon connector, is
always the first choice. By connecting to the amplifier’s speaker outputs the sonic signature
of the entire amplification chain is folded into the signal for the sub, thereby keeping timing
and timbre cues consistent. In other words, the signal sent to the REL is exactly the same
signal sent to the speakers, allowing for seamless integration. This connection can be made
without affecting the performance of the amplifier because the sub’s amplifier input
impedance is 100,000 ohms. This scheme also avoids adding any detrimental effects by not
interposing any additional electronics into the amplification chain.
•The standard high level hook up procedure is: attach the red wire to the amplifier’s right
positive speaker output terminal; attach the yellow wire to the amplifier’s left positive speaker
output terminal; attach the black wire to which ever of the amplifier’s ground output terminals
is convenient; plug the Speakon connector into the sub’s high level input.
•For differential amplifiers using one sub, simply use the standard connecting scheme with the
exception of connecting ground to chassis ground, not to speaker output ground, and then
connecting into the high level input (Hi Input or Unbal Hi Input on Stentor III and Studio III).
•For differential amplifiers using two subs, one for each channel: connect red to positive;
yellow to negative; and black to chassis ground; plug the Speakon into the balanced high
level input (Bal Hi Input).
Low-level connection, RCA inputs (or XLR on some models), is always an option, should high-level
connection not be possible, or in a theatre system where both high-level and low-level connection
should be used. When connecting to the low level inputs, connect a single RCA cable to the 0dB
RCA jack. Additional gain can be achieved by connecting to the +12dB input. If you are connecting
two channels of stereo output from a pre-amplifier, simply use a high-quality y-adapter to sum the two
signals together.

REL Acoustics ‘Q’ range User manual
17
Positioning
The optimal position for a REL is in one of the corners behind the main speakers. This position
provides 9 dB of mechanical amplification and allows for the most linear true low bass wave launch,
owing to the ability to tune the sub to the axial node of the room, or longest throw distance.
The Process
To begin the set-up process, choose a piece of music that has a repetitive bass line that is very low in
frequency. We recommend cut 4 from the soundtrack to Sneakers (Columbia CK 53146). This has a
repetitive bass drum throughout that gives you plenty of time to move the woofer around, but more
importantly, the recording venue was quite large for this recording, and therefore it has a very deep
and large-scale bass signature. This type of cut is perfect for the set-up process, and should be
played at the highest reasonable level expected for system play back.
Working with a partner, one in the listening position and one at the woofer manipulating the controls,
is the most effective and efficient ways to set up the woofer. If working alone, the initial steps in the
set-up can very effectively be carried out from the location of the woofer. Trying to ignore all other
music in the cut, listen for the bass drum and its effect on the listening room.
1. Phase Orientation: Once in the corner we need to adjust for phase. This may be the single
most critical step, and because it really is quite simple, it is often over thought, especially by
the most experienced audiophiles. Keep in mind; the right phase is whichever position is the
loudest or fullest. While playing music with true low bass, adjust the crossover to a point
where the sub and the speaker are sure to share frequencies (B, 3 for big speakers or C, 4
for smaller speakers). At this point turn the gain so that both sub and speaker are roughly
equal and then switch, using the “mode selector” switch, from “0” (position 1) to “180”
(position 3) phase positions. Again, whichever position is loudest or fullest is the correct
position, and, as often as not, may be 180-degree phase. That is, this position is working in
harmony with your main speakers, reinforcing bass, and not cancelling it.
2. Room Orientation: Next, if space allows, try two different orientations of the woofer relative to
the wall. First, while playing the set-up cut, place the REL with the connection panel parallel
with the rear wall. Second, place the REL with the connection panel parallel with the side
wall. As with phase, the orientation which yields the most output is the best position for that
room. This process simply orients the driver, and port, to most efficiently vent into the room.
In some instances there may be little difference, at which point aesthetic concerns may
override performance concerns. For Q series, if possible, point the driver directly out of the
corner, equidistant from the side walls.
3. Placement: The next step is to determine precisely how far out from the corner the sub
should be placed to achieve the most efficient output, as well as the lowest frequency
extension. With the sub fully into the corner, continuing to play the music, slowly pull the sub
from the corner on the diagonal, equidistant from both side and rear wall. At a certain point
(sometimes a matter of only a few inches, in rare cases a foot or more) the sub will audibly
go lower, play louder, and, if it truly locks on to the room and is fully pressurising it, the air
around the sub will seem to be energised, stop right there! This is the correct position for the
sub.
4. Crossover and Gain Settings: To determine the crossover point, bring the gain down, put the
crossover to A-1, bring the gain back up to the point where you have achieved a subtle
balance (In some situations where there may not be sufficient output due to room and
subwoofer interactions B-1 should be the position to use in setting initial gain). Working only
with the coarse control (A-D), bring the crossover point up until it is obviously too high, at this
point bring it down to the next lowest setting. Now, working with the fine control (1-6), bring
up the crossover point until it sounds too high at which point bring it back down to the next
lowest setting. For all intents and purposes, this is the correct crossover point. Once this
stage has been reached subtle changes to gain and crossover can be accomplished to
provide the last bit of complete and seamless integration. With that, set-up is complete.

REL Acoustics ‘Q’ range User manual
18
Note: As the Q-series crossover adjustment uses a single variable control, use the closest
correlating position to any of the crossover settings noted above for ST series models.
Ultimately, as with the click stops of the ST range, simply bring gain and then crossover up
until excess output is achieved, then back down a soft-click or two.
Hint: There is a tendency among audiophiles to set the crossover point too high and the gain
too low when first learning how to integrate a REL with the system, the fear being one of
overwhelming the main speakers with bass. But in doing so, the resulting set-up will be
lacking in bass depth and dynamics. The proper crossover point and gain setting will
increase overall dynamics, allow for extended bass frequencies, and improve soundstage
properties.
Note, gain must be adjusted in conjunction with crossover changes. In general, when
selecting a lower crossover point, more gain may need to be applied.
Theatre and Film Applications: For Dolby Digital AC-3or other 5.1 theatre systems, once the
standard set-up for two-channel outlined above is complete, the LFE output from the processor or
receiver should be connected to the low-level input and appropriate gain adjustments made. It may
be necessary to take the crossover out of the low-level input using the “mode” switch if extra upper
bass output is called for. Keep phase consistent with what was selected during high-level set-up by
simply choosing the corresponding setting (1 = 2, 3 = 4). For this configuration, you must set the
processor to the “large” or “full range” setting for the left and right speakers in order for the REL to
receive the bass signal via the high-level cable. In this configuration, the REL provides support for
both the left and right speakers for two-channel listening, and support for the LFE when movies are
playing. Most processors will allow you to defeat the subwoofer output when listening in the two-
channel mode. The effect of this set-up is one of greatly increased dynamics in the mid-bass range,
no bass bloat, and a greater degree of space and timing from the Foley effects. For an even greater
sense of space and impact, a second woofer connected in parallel to the centre channel will prove to
be a dramatic improvement as well. And if that is not enough fun, a rear sub, both to support the rear
channel speakers as well as to evenly distribute LFE through the room, truly completes the full-range
sonic picture for state-of-the-art film reproduction. A comprehensive set-up paper for home theatre
will be coming very soon.
Other Tips: Generally speaking, do not use the supplied spikes. RELs work on the principle of the
driver in a high-pressure zone relative to the floor. Spiking the REL will decouple the woofer from the
floor, which will lean out the bass response. If the floor is an older, very “springy” floor, spikes can be
useful in reducing the influence of the REL on the floor. But better yet, a heavy stone slab placed
under the REL will work better. Even if you intend to use the spikes, do NOT insert them until
completion of the set-up process. After which, subtle adjustments to crossover and gain may be
necessary.

REL Acoustics ‘Q’ range User manual
19
REL Set-Up Made Simpler
Connecting
High-level connection, using the enclosed cable, is always the first choice. The standard high
level hook up procedure is: attach the red wire to the amplifier’s right positive speaker output
terminal; attach the yellow wire to the amplifier’s left positive speaker output terminal; attach
the black wire to which ever of the amplifier’s ground output terminals is convenient; plug the
connector into the “Hi Level” input. For connection to a differential amplifier consult your
dealer.
Positioning
Primary Placement, for a REL is in one of the corners behind the main speakers.
Phase Selection is the next step. Keep in mind; the correct phase is whichever position is the loudest
or fullest. While playing music with true low bass, adjust the crossover to a point where the sub and
the speaker are sure to share frequencies (B, 3 for big speakers or C, 4 for smaller speakers). At this
point adjust the gain so that both sub and speaker are roughly equal in output and then switch, using
the “mode selector” switch, from “0” (position 1) to “180” (position 3) phase positions. Again,
whichever position is loudest or fullest is the correct position, and, as often as not, may be 180-
degree phase (see enclosed “Control Panel” section from the owner’s manual).
Orientation. With phase correct, it is important to site the woofer in the corner by determining which
wall, the side or the rear, the REL’s amp should face. Flip the sub back and forth in the corner, and,
again as with phase, whichever position sounds the loudest is the correct orientation for the sub. For
Q series, if possible, point the driver directly out of the corner, equidistant from the side walls.
Final Position. The next step is to determine precisely how far out from the corner the sub should be
to achieve the most efficient output, as well as the lowest frequency extension. With the sub fully into
the corner, continuing to play the music, slowly pull the sub from the corner on the diagonal,
equidistant from both side and rear wall. At a certain point (sometimes a matter of only a few inches,
in rare cases a foot or more) the sub will audibly go lower, play louder, and, if it truly locks on to the
room and is fully pressurising it, the air around the sub will seem to be energised. Stop right there!
This is the correct position for the sub.
Adjusting
Crossover Selection. To determine the crossover point, bring the gain down, put the crossover to A-1
(or B-2 should output not be sufficient), and then bring the gain back up to the point where you have
achieved a subtle balance. Working only with the coarse control (A-D), bring the crossover point up
until it is obviously too high, at this point bring it down to the next lowest setting. Now, working with
the fine control (1-6), bring up the crossover point until it sounds too high, at which point bring it back
down to the next lowest setting. For all intents and purposes, this is the correct crossover point. Once
this stage has been reached, subtle changes to gain and crossover can be accomplished to provide
the last bit of complete and seamless integration. For Q series, use the variable controls in much the
same way, slowly turning up both gain and crossover until excess output is realised, then back down
a soft-click or two.
Including Theatre
Multi-channel systems LFE output should be connected to the low-level input and appropriate gain
adjustments made at this point. It may be necessary to take the crossover out of the low-level input
using the “mode” switch if extra upper bass output is called for. Keep phase consistent with what was
selected during high-level set-up by simply choosing the corresponding setting (1 = 2, 3 = 4). When
connecting to the low level inputs, connect a single RCA cable to the 0dB RCA jack. Should
additional gain be required, connect to the +12 dB input.

REL Acoustics ‘Q’ range User manual
20
RUNNING IN
Care taken over running in will be rewarded by many years of pleasurable use. Both the electronics
and the drive unit will benefit from an initial period of carefully controlled use. Possible damage may
be sustained by running in the unit at too high a volume setting over an extended period. On the
other hand, by taking a little care over this initial period, about 24 hours of actual use, a longer life
with a higher potential eventual performance is assured.
CARE AND POLISHING
Grittex (sprayed) finishes:
These are best maintained by careful dusting with a lint free cloth. Alternatively, a soft bristled brush
may be used to sweep off any dust failing on the surface. If objects are to be placed upon the top, it is
advisable to use a small mat to protect the surface and to avoid the risk of rattles.
Wood veneer finishes:
Dusting as above, plus the occasional polishing with a good quality furniture polish for the wood
veneers. Treat the finish as you would any other piece of quality furniture in your home.