Nice PROFICIENT AUDIO PAS-A4100 User manual

Installation Guide
Four Channel Analog Filtering Amplier
PAS-A4100
4-Channel Amplier
CAN/ICES-003(B)/NMB-003(B)
Nice North America LLC
5919 Sea Otter Plac e, Carlsbad, CA USA 92010
Designed a nd Engineered in the U. S.A, Made in China
CLASS 2 W IRIN G CLASS 2 W IRIN G
PAS-A4100
1 2 3
20Hz
100Hz
20Hz 20Hz 20Hz
4 1 2 3 4
T6.3A L 250V~
100-120 / 220-240V~
50/60Hz 400W
1 2
100Hz 100Hz 100Hz
3 4
TRIGGER IN
TRIGGER OUT
TRIGGERAUTO
NORMAL
BRIDGE
OFF ON
BRIDGE
OFF ON
IN
OUT OUT OUT OUT
INININ
PAS-A4100

2
Contents
Important Safety Instructions ............................................... 4
Introduction ............................................................. 5
Bridgeable Power Amplier ................................................ 5
Features and Benets ..................................................... 6
Real World Power..................................................... 6
Bridgeable in Pairs .................................................... 6
Freedom from Crosstalk................................................ 6
Freedom from Fan Noise ............................................... 6
Independent Level Controls ............................................. 6
Reliable Connections .................................................. 7
Turn-On Modes ...................................................... 7
Automatic Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Status Display for Troubleshooting ....................................... 7
Control Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Bridged Mode ....................................................... 7
Compact 1U Design................................................... 7
Installation Considerations ................................................. 8
Placement .......................................................... 8
Turn-On Modes ...................................................... 9
Analog High-Pass Filters ............................................... 9
Bridged Mode ...................................................... 10
Multiple Speaker Loads ............................................... 10
Front and Rear Panel Details .............................................. 12
Installation ............................................................. 13
Setting the Turn-On Mode Switch ....................................... 13
Control Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Speaker Wire Connections............................................. 14
Line Level Audio Input ................................................ 15
Cascade Audio Outputs............................................... 15
AC Power Plug ...................................................... 16
Operation .............................................................. 17
Power Switch ....................................................... 17
Power LED ......................................................... 17
Bicolor Status LED ................................................... 17
Cleaning and Maintenance............................................. 17
Input Level Adjustment Control ......................................... 18
Listening At Higher Volumes ........................................... 19
Troubleshooting Guide ................................................... 20
Specications .......................................................... 21
Limited Warranty ........................................................ 22
Notes ................................................................. 23

3
Thank you for purchasing the Procient PAS-A4100 amplier, one of the most
exible and convenient ampliers ever offered, your new “go-to” amp.
Like all Nice products, the Procient PAS-A4100 is built to the highest standards
of quality control and reliability. With proper installation and operation, you’ll enjoy
years of trouble-free use.
Use this guide as a reference, and be sure to visit www.niceforyou.com for
additional materials and support.
CONGRATULATIONS!

4
Important Safety Instructions
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with a dry cloth.
7. Do not block any ventilation openings. Install in
accordance with the manufacturer’s instructions.
8. Do not install near any heat sources such
as radiators, heat registers, stoves or other
apparatus (including ampliers) that produce
heat.
9. Do not defeat the safety purpose of the
polarized or grounding-type plug. A polarized
plug has two blades with one wider than the
other. A grounding-type plug has two blades
and a third grounding prong. The wide blade
or the third prong is provided for your safety. If
the provided plug does not t into your outlet,
consult an electrician for replacement of the
obsolete outlet.
10. Protect the power cord from being walked on
or pinched, particularly at plugs, convenience
receptacles and the point where they exit from
the apparatus.
11. Only use attachments/accessories specied by
the manufacturer.
12. Use only with the cart, stand,
tripod, bracket or table specied
by the manufacturer or sold with
the apparatus. When a cart is
used, use caution when moving
the cart/apparatus combination
to avoid injury from tip-over.
13. Unplug this apparatus during lightning storms or
when unused for long periods of time.
14. Refer all servicing to qualied service personnel.
Servicing is required when the apparatus has
been damaged in any way, such as power supply
cord or plug is damaged, liquid has been spilled
or objects have fallen into the apparatus, the
apparatus has been exposed to rain or moisture,
does not operate normally, or has been dropped.
15. Do not expose this apparatus to dripping or
splashing and ensure that no objects lled
with liquids, such as vases, are placed on the
apparatus.
16. To completely disconnect this apparatus from
the AC Mains, disconnect the power supply cord
plug from the AC receptacle.
17. The power supply cord (sometimes referred to
as the “Mains Plug”) is used as the disconnect
device and shall remain accessible and operable
at all times.
18. Do not expose batteries to excessive heat such
as sunshine, re or the like.
19. Open ame sources, such as lighted candles,
should NOT be placed on the apparatus.
WARNING: To reduce the risk of re or electric
shock, do not expose this apparatus to rain or
moisture.
The lightning ash with arrowhead
symbol, within an equilateral triangle, is
intended to alert the user to the presence
of uninsulated “dangerous voltage”
within the product’s enclosure that may
be of sufcient magnitude to constitute a
risk of electric shock to persons.
The exclamation point within an
equilateral triangle is intended to alert the
user to the presence of important
operating and maintenance (servicing)
instructions in the literature
accompanying the product.
FCC Required Text:
NOTE: This equipment has been tested and found
to comply with the limits for a Class B digital device,
pursuant to part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against
harmful interference in a residential installation. This
equipment generates, uses, and can radiate, radio
frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful
interference to radio communications. However,
there is no guarantee that interference will not occur
in a particular installation. If this equipment does
cause harmful interference to radio or television
reception, which can be determined by turning the
equipment off and on, the user is encouraged to
try to correct the interference by one or more of the
following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the
equipment and receiver.
• Connect the equipment into an outlet on a
circuit different from that to which the receiver
is connected.
• Consult the dealer or an experienced radio/TV
technician for help.
Changes or modications not expressly approved by
the party responsible for compliance could void the
user’s authority to operate the equipment.

5
Introduction
Bridgeable Power Amplifier
The Procient PAS-A4100 Four Channel Analog Filtering Amplier is designed
for exibility and convenience for the vast majority of distributed audio and home
entertainment applications. It is powerful, easy to congure and install.
The Procient PAS-A4100 delivers up to 100 watts of power to each of four
independent channels. It is bridgeable in pairs- doubling the output and enabling
for 2, 3 or 4-channel conguration.
Additionally, each channel has two selectable analog high pass lters. These
lters are critical to optimize the performance of connected satellite speakers or
subwoofers, without the hassle of DSP or IP. Independent level control allows
you to trim the signal for lower output to small speakers or turn all the way up for
max power. The amplier is stable at a low impedance so it is capable of driving
multiple satellite speakers or a subwoofer from each channel.
Preamp outputs on every channel allow for patching to an adjacent channel or
sending the signal to another device. Audio sensing, and In and Out triggers add
power management convenience. Each channel has a signal and clipping indicator
located on the stylish brushed aluminum front panel for easy troubleshooting and
signal verication. Rack ears and tabletop feet are included for mounting options.
The Procient PAS-A4100 4-Chanel Amplier offers exceptional performance
features, convenience, and exibility in an elegant single rack mount chassis.

6
Features and Benefits
Real World Power
The Procient PAS-A4100 deploys four independent channels of up to 100 watts
per channel peak and over 70 watts per channel continuous with an 8Ω load and
all channels driven. The power nearly doubles when presented with a 4Ω load. The
Procient PAS-A4100 delivers more than enough power for the vast majority of
architectural and outdoor speakers.
Bridgeable in Pairs
Each bridged pair delivers 200 watts of rated power with an 8Ω load and all
channels driven. This enables conguration as a 2 x 200W two -channel amp,
or a 1 x 200w + 2X 100W 3 channel amp for exceptional exibility in the eld.
It is designed to operate with a wide range of impedance loads, so it can drive
sub woofers and multiple satellite speakers simultaneously in a variety of
congurations.
Freedom from Crosstalk
Each channel has a choice of two high pass lters. One rolls off at 20Hz and
is designed for subwoofers and large full range speakers with extended bass
capabilities and will lter out in audible low frequencies and rumble that can
overwork subwoofers and impede optimum performance in the audible range.
Freedom from Fan Noise
The oversized heat sinks inside the 4-Channel Amplier allow the amplier circuitry
to stay cool even when operating into low impedance loads without the distracting
noise created when using fan-cooled ampliers.
Independent Level Controls
Each amplier channel features an independent level control enabling precise
volume matching to the rest of the system. These level controls can also limit
volume to prevent abuse of the system.

7
Features and Benefits
Reliable Connections
The Procient 4-Channel Amplier features gold plated stereo inputs, cascade
stereo outputs, and ve way binding posts to ensure perfect connections without
corrosion for years to come.
Turn-On Modes
The Procient 4-Channel Amplier family features three turn-on modes:
1. Music Sense, 2. External Voltage Trigger, 3. Manual Turn-On via the Front panel
switch. You can congure amplier to interface with any kind of system and have
the unit automatically turn on.
Automatic Protection
The Procient 4-Channel Amplier family is equipped with sophisticated protection
circuits. In the unlikely event that a problem occurs, the amplier shuts itself off.
When conditions return to normal, regular operation resumes.
Status Display for Troubleshooting
LED indicators on the front panel indicate: Power- Active Status, and a Protection
Warning. Channel – Signal present (green) Clipping (red). With a glance at the front
panel key information is presented.
Control Output
A 12 Volt DC output is provided whenever the amplier is on, allowing you to
operate voltage triggered devices like motorized screens and curtains.
Bridged Mode
The Procient PAS-A4100 can be bridged in pairs. Bridged mode is perfect for
subwoofer, rock speakers or any applications requiring high power output.
Compact 1U Design
The Procient PAS-A4100 compact design requires only a single rack space (1U).
Designed and Engineered in the USA
Limited two-year parts and labor warranty.

8
Allow a minimum of 2” of depth behind unit to
accommodate cables and connectors.
If the cabinet rear is not open to fresh air or if
you’re using low impedance loads, install two
“boxer fans” to provide continuous air ow into
and out of the cabinet.
Boxer Fan (55 CFM)
directly centered 2”
behind the Amplier.
Boxer Fan (55 CFM)
directly centered 7”
on top of the Amplier.
Figure 1 Figure 2
Make sure that there is a minimum of 7” of free air
space above the amplier for proper ventilation.
Installation Considerations
Placement
Place the amplier on a at level surface like a table or shelf. It should be placed
upright so that its weight rests on the four attached feet. Placing the weight of the
amplier on the rear or front panel for even an instant will result in damage to the
amplier’s connectors and controls.
Like any hi- component, the amplier will last much longer if it is given adequate
ventilation for proper cooling. When installing in a cabinet, be sure that the rear
of the cabinet is open to fresh air to provide proper cooling (see Figure 1). If the
cabinet’s design will not accommodate an open rear, install two small “boxer fans”
to provide continuous air ow into and out of the cabinet (see Figure 2). Place
the amplier so that there is at least 7” of free air space above the chassis. If the
amplier is located on a carpeted surface, place a board under the amplier’s feet.
Do not block the ventilation holes on the top and bottom of the amplier.
CAUTION! When using low impedance speaker loads (less than 8 ohms Normal
Mode) refer to Figure 2 for proper placement.

9
CAN/ICES-003(B)/NMB-003(B)
Nice North America LLC
5919 Sea Otter Place, Carlsbad, CA USA 92010
Designed and Engineered in the U.S.A, Made in China
CLASS 2 WIRING CLASS 2 WIRING
PAS-A4100
1 2 3
20Hz
100Hz
20Hz 20Hz 20Hz
4 1 2 3 4
T6.3AL 250V~
100-120 / 220-240V~
50/60Hz 400W
1 2
100Hz 100Hz
100Hz
3 4
TRIGGER IN
TRIGGER OUT
TRIGGERAUTO
NORMAL
BRIDGE
OFF ON
BRIDGE
OFF ON
IN
OUT OUT OUT OUT
INININ
Installation Considerations
Turn-On Modes
The Procient 4-Channel Amplier draws more current than a preamplier’s
switched AC outlet can safely supply. Also, your preamplier may “thump” at
dangerous volumes if the amplier is already on when the preamp turns on.
It is usually best to turn the amplier on only when it is needed. The Turn-On Mode
selector switch gives you three options for turning the amplier on and off.
Audio sense is the factory default setting.
Analog High-Pass Filters
Switch left for 20Hz, ideal for subwoofers and large full range speakers. Middle
is at (no lter). Switch right for 100 Hz, ideal for speakers with 3- 7” woofers,
speakers and larger speakers when paired with a sub.
NORMAL - The auto turn-on circuitry is off. The front panel master power switch
operates the amplier. In is “On”, out is “Off”.
AUDIO SENSE - The master switch on the front panel must be in the “On”
position. The amplier is off when there is no audio signal present at either the
left or the right input, but the sensing circuitry is on. The turn-on sensing circuitry
looks for a tiny amount of audio signal present at any of the audio inputs. If it
detects a signal, the amplier is turned on. Once the audio signal stops, the
sensing circuit waits 30 minutes, then turns the amplier off.
3-24 VOLT AC/DC OPTO-ISOLATED VOLTAGE TRIGGER - The Power switch
on the front panel must be in the “On” position for the voltage trigger to function.
When a 3.5mm Mono plug is inserted into the rear panel connector and the
sensing circuitry detects a voltage, the amplier is turned on. Once the Trigger
voltage is turned off, the sensing circuit instantly turns the amplier off. The
amplier is off when there is no 3-24V AC or DC voltage detected at the trigger
input. Voltage triggers can be supplied by Nice automated switchers, some video
projectors, some surround sound processors, or something as simple as a 12 volt
AC wall adapter plugged into the switched outlet of your stereo receiver. Linear DC
wall adapters are not recommended; the long discharge time of the DC adapter’s
lter capacitor will delay the turn-off of the amplier. Trigger sources must be
3-24VAC or DC, 20mA or greater.

10
Installation Considerations
Bridged Mode
The Procient PAS-A4100 is bridgeable in pairs, each bridged mode switch allows
you to bridge either channels 1 with 2 or 3 with 4. The example below is for bridging
channels 1 and 2. The same procedure can be applied to channel 3 and 4.
TURN OFF THE AMP BEFORE SWITCHING TO BRIDGE MODE. Set the bridge
mode switch to ON.
In bridged mode, connect the speakers to the channel 1 red terminal and the
channel 2 red terminal. In bridged mode the channel 1’s red terminal becomes
positive and the channel 2’s red terminal becomes negative.
DO NOT USE THE BLACK NEGATIVE (-) TERMINALS. THE SIGNAL IS AT THE
RED TERMINALS ONLY.
The line level input signal must connect to the channel 1 (channel 3 when bridging
3 and 4) input of the amplier when using bridged mode. [When in bridged
mode only, the odd channels (channels 1 and 3) need connection since the even
channels are not engaged when in bridge mode].
Multiple Speaker Loads
The Procient PAS-A4100 Amplier is stable into very low impedance loads.
This means you can safely operate up to three 8-ohm speakers per channel
(2.67 ohm load) directly connected to the amplier. Note that the 2-Channel
Amplier does not have on/off speaker switching built in. When the amplier is
on, so are all of the speakers.
CAN/ICES-003(B)/NMB-003(B)
Nice North America LLC
5919 Sea Otter Place, Carlsbad, CA USA 92010
Designed and Engineered in the U.S.A, Made in China
CLASS 2 WIRING
CLASS 2 WIRING
PAS-A4100
1 2 3
20Hz
100Hz
20Hz 20Hz 20Hz
4 1 2 3 4
T6.3AL 250V~
100-120 / 220-240V~
50/60Hz 400W
1 2
100Hz 100Hz 100Hz
3 4
TRIGGER IN
TRIGGER OUT
TRIGGERAUTO
NORMAL
BRIDGE
OFF ON
BRIDGE
OFF ON
IN
OUT OUT OUT OUT
INININ

11
PAS-A4100
4-Channel Amplier
Front panel “Master Power” switch turns off the
entire amplier, including the Turn-On circuitry.
CAN/ICES-003(B)/NMB-003(B)
Nice North America LLC
5919 Sea Otte r Place, Car lsbad, CA USA 9 2010
Design ed and Engi neered in th e U.S.A, M ade in China
CLASS 2 WIRING
CLASS 2 WIRING
PAS-A4100
1 2 3
20Hz
100Hz
20Hz 20Hz 20Hz
4 1 2 3 4
T6.3 AL 250V~
100-120 / 220-240V~
50/60Hz 400W
1 2
100Hz 100Hz 100Hz
3 4
TRIGGER IN
TRIGGER OUT
TRIGGERAUTO
NORMAL
BRID
GE
OFF
ON
BRIDGE
OFF ON
IN
OUT OUT OUT OUT
INININ
Main Inputs enable you
to route a stereo line level
source to the amplier.
3.5 mm mini-jack
for voltage input
Analog High-Pass Filters
3.5 mm mini-
jack for 12V DC
control output
Turn-On
Mode
Switch
Bridge mode switches
Level Adjustments
enable you to preset
the maximum system
volume (or match levels
with another amplier)
Cascade (preamp)
Outputs of the main
input enable you to daisy
chain multiple ampliers
or cross patch to an
adjacent channel
Installation Considerations

12
PAS-A4100
4-Channel Amplier
Channel indicators light green
when signal is present and red
when clipping
Bicolor Status LED illuminates
“Blue” when the amplier circuitry
has been turned on by the Turn-On
circuits, and illuminates “red” to
indicate activation of the amplier’s
built-in protection circuitry
CAN/ICES-003(B)/NMB-003(B)
Nice North America LLC
5919 Sea Otter Place, Carlsbad, CA USA 92010
Designed and Enginee red in the U.S.A, M ade in China
CLASS 2 WIRING CLASS 2 WIRING
PAS-A4100
1 2 3
20Hz
100Hz
20Hz 20Hz 20Hz
4 1 2 3 4
T6.3AL 250V~
100-120 / 220-240V~
50/60Hz 400W
1 2
100Hz 100Hz 100Hz
3 4
TRIGGER IN
TRIGGER OUT
TRIGGERAUTO
NORMAL
BRIDGE
OFF ON
BRIDGE
OFF ON
IN
OUT OUT OUT OUT
INININ
Binding posts for
speaker connections
IEC receptacle for
AC power cord
Replaceable main
power fuse
Front and Rear Panel Details

13
Installation
Setting the Turn-On Mode Switch
The Procient 4-Channel Amplier has three turn-on modes. Select which mode
you desire by sliding the mode switch. See Installation Considerations on pages
7-9 for more information about each of the turn-on modes. Audio sense is the
factory default setting.
Control Output
This terminal provides a 12V DC signal suitable for triggering Nice automated
switchers, some motorized screens, some electric curtain controls, etc. The trigger
voltage is present only when the amplier is active or “on”. When the amplier
turns “off”, the 12 Volt signal is off.
CAN/ICES-003(B)/NMB-003(B)
Nice North America LLC
5919 Sea Otter Place, Carlsbad, CA USA 92010
Designed and Engineered in the U.S.A, Made in China
CLASS 2 WIRING CLASS 2 WIRING
PAS-A4100
1 2 3
20Hz
100Hz
20Hz 20Hz 20Hz
4
1 2 3 4
T6.3AL 250V~
100-120 / 220-240V~
50/60Hz 400W
1 2
100Hz 100Hz 100Hz
3 4
TRIGGER IN
TRIGGER OUT
TRIGGERAUTO
NORMAL
BRIDGE
OFF ON
BRIDGE
OFF ON
IN
OUT OUT OUT OUT
INININ
Slide the switch with your
ngernail or a 1/8” slotted
screwdriver blade
TIP: To conserve energy set the TURN ON mode to either AUDIO SENSE or
TRIGGER INPUT. Use of the NORMAL mode will prevent the amplier from
turning off when not in use.
STEP DESCRIPTION
1. Check the requirements of the
device you want to control.
The control output has a maximum
current capability of 12V DC 150 mA.
2. Connect a 3.5 mm Jack to the
control output maintaining proper
polarity (tip = +).

14
BARE WIRE
Unscrew the red or
black plastic knob,
insert the bare wire
end into the opening,
and then tighten the
knob until the wire is
securely clamped.
BANANA PLUGS
There are many types of
banana plugs, some crimp,
some solder. The gold
banana plug has 3 quick-
connect binding post for the
bare wire on the body of the
plug. A banana plug is simply
inserted into the jack at the
end of the amplier’s binding
post. Dual banana plugs will
t the binding post.
CAUTION! All speaker wire connections must be made with the amplier off.
Installation
Speaker Wire Connections
STEP DESCRIPTION
1. Label all wires. If you label the wires for their destination, rather
than which terminal of the amplifier they are
connected to, it will be easier to reconfigure your
system in the future.
2. Connect one stripped wire end or
banana plug to the black terminal
and one to the red terminal.
A. Split the speaker wire insulation so that at least
two inches of each conductor are separated.
B. Strip one half inch of insulation from the end of
each conductor of the speaker wire.
C. Attach banana plugs or twist the strands
of wire together and insert them into the
appropriate binding post.

15
Installation
Line Level Audio Input
CAUTION! The amplier must be off whenever you make changes to the input
connections.
Cascade Audio Outputs
The “Cascade Audio Outputs” enable you to connect an adjacent channel or
another amplier to your preamplier output. The connectors are gold-plated
RCA phono jacks. Connect them to another amplier’s inputs with a standard
RCA cable.
STEP DESCRIPTION
1. Label all of the interconnecting cables
for the sources they connect to.
Use audio patch cables with RCA phono plugs
attached to the ends.
2. Connect the sources by inserting the
RCA plugs into the amplifier’s jacks.
Connect outputs from your sources to inputs
on the amplifier. Never connect a source or
preamplifier’s input (e.g., record inputs) to the
inputs of your amplifier.

16
Installation
AC Power Plug
CAUTION! Typically a preamp/receiver’s switched outlet is not rated for a power
amplier. The Procient PAS-A4100 draws 400 watts maximum from an AC wall
outlet respectively. Use a dedicated AC wall outlet along with the amplier’s auto
turn on circuit to ensure adequate power.
STEP DESCRIPTION
1. Plug the female IEC socket of the supplied
AC power cord (the supplied power cord
is designed for 120V AC wall outlets), or
use an appropriate IEC AC power cord
to match the electrical wall outlet you
are using (e.g. 240V AC), into the IEC
receptacle on the rear of the amplifier.
Just like a computer or printer, the Proficient
4-Channel Amplifier has an AC cord which
unplugs either at the amp or at the wall for
your convenience.
2. Plug the male end of the AC power cord
into a correctly grounded wall outlet.
If you use a grounded power strip, surge
suppressor or extension cord, verify that
proper ground is maintained.

17
Operation
Power Switch
The front panel switch is a master or “vacation” power switch. No matter which
turn-on mode you have selected, the master power switch will turn off all circuitry
including the sensing circuitry. If you will not be using the amplier for an extended
period of time, turn the master power switch “Off” (push button switch out). When
you would like to return to normal operation, turn the switch “On” (push button
switch in).
IMPORTANT NOTES: Equipment is not completely disconnected from main
power source when power switch is in the “OFF” position.
Power LED
The power LED indicates that the AC cord is plugged into a working AC power
receptacle and that the power switch is in the “On” position.
Bicolor Status LED
The bicolor Status LED illuminates “blue” when the amplier circuitry has been
turned on by the Turn-On circuits, and illuminates “red” to indicate activation of
the amplier’s built-in protection circuitry due to either a fault in the wiring or the
speaker, or with the amplier itself.
Cleaning and Maintenance
The internal parts of the Procient 4-Channel Amplier are electronic and require
no maintenance. Once a year it is appropriate to twist the RCA connectors on
each input to remove corrosion and improve conductivity. You can clean the
amplier with soft cloth or paper towel dampened with water or a mild detergent.
Do not use any spray-type, abrasive cleaners on the amplier.

18
Operation
Input Level Adjustment Control
The rear panel Input Level adjustment screws allow you to adjust the level of the
amplier relative to other ampliers in your system and / or to limit maximum safe
gain to protect speakers in the system.
NOTE: Start this adjustment with the Input Level Adjustment Controls at their
factory default. (12:00 position).
For systems that have multiple ampliers and / or operated by remote
control; i.e. in-wall volume controls, touch pads, etc.,
Use the Input Level Control to achieve a “maximum” desired listening level across
all of the ampliers / zones, following these steps:
1. Lower the Input Level Controls to the minimum position. If there are any
other ampliers in the system, lower their respective Input Level Controls
to their minimum (all ampliers in your system must have level controls.)
2. Raise all of the individual in-wall volume controls to their loudest setting.
3. Play a loud radio station with the tuner set to Mono.
4. Raise the volume of your preamplier or receiver SLOWLY – if you hear
any sound, lower the volume and recheck that all of your ampliers
Input Level Controls are turned to their minimum. They must be at their
minimums. Raise the volume again on your preamplier or receiver
SLOWLY. If no sound is heard, proceed to step ve.
5. Have someone step into each room and listen as you adjust each Input
Level Control to the desired maximum level for that room. (Special note:
There is a potential of running the amplier into “clipping distortion” and
/ or “protection shut-down” by sraising the Input Level Controls to their
extreme. Please review “Listening at Higher Volumes” following this
section.)
• In applications with multiple ampliers, step between the different zones /
rooms and adjust the Input Level Controls of each additional amplier to
best match the volume of the rst amplied zone / room.
• With independent Input Level Controls for each channel, volume balance
between speakers within the same room is possible, allowing ne volume
tuning for the most appropriate listening position variables.

19
Operation
For systems that ARE NOT operated by remote control; i.e. in-wall volume
controls, touch pads, etc.,
Use the Input Level Controls to set a maximum “safe” volume level to protect your
speakers and / or optimize the signal-to-noise ratios between source components
and amplier. Source component output level controls are sometimes overly-
sensitive near their minimum position. By reducing an amplier’s Input Level
Controls, you urge the source component’s volume control to operate in a more
reasonable and enjoyable range. This is very subjective, so trial adjustments and
listening are in order to dial this for the given application.
As identied in 5b above, with independent Input Level Controls for each channel,
volume balance between speakers within the same room are possible. This
exibility allows for channel volume tuning (left/right channel balance) for off-
center listening positions.
Listening At Higher Volumes
It requires more power to achieve a reasonable volume of sound in a large room
than it does in a small room. It is possible (even if you are not a teenager) to turn
the volume so high that the amplier runs out of power. This creates “clipping”
distortion.
Clipping distortion can be rst detected in the higher frequencies of your musical
content. Clipping distortion will make the treble sound very harsh and unmusical.
When you hear harsh sounding treble from any good speaker, turn the volume
down immediately! Those harsh sounds are masking some much more powerful
high frequency sound spikes which could quickly damage the speaker and/or
activate the ampliers protection circuit. Clipping distortion causes the amplier to
work harder in its attempt to reproduce the signal resulting in an increase in heat
generated by the amplier.
If you continue to operate the amplier at “clipping” power levels, the amplier
protection circuits will activate when the amplier overheats, shutting the amplier
off. The protection circuits will reset automatically once the amplier’s internal
circuitry cools. Should the protection circuit become activated, reduce the
master volume and re-check the Input Level Control adjustments to minimize the
chance of a reoccurrence. Perpetually overdriving your speakers and amplier
is considered abuse and will void the manufacturer’s warranty of all affected
products.

20
Troubleshooting Guide
When there is a problem, consult this guide rst. If the problem persists, or you
have additional questions, call your local Nice dealer or Nice Technical Support at
1-800-421-1587. The most common problems relate to hook up. Call from your
telephone extension nearest the system.
Symptom Possible Causes and Test Procedure
No sound on one channel
• Check front panel signal indicators. If not illuminated,
check that the level control on the rear panel is not all
the way down.
• Check the cable back to the source and the source
output.
• Check the Speaker wire on both sides of the channel.
No sound on all channels
• Check power.
• Check AC cord is in completely.
• Check front panel signal present LED’s.
• Check level controls of rear panel.
• Check power on status, power source (wall, outlet
strip etc.)
• Check front panel LED for fault (Red).
• Check all speaker connections at amp and speakers,
look for shorts if fault indicator is on.
• Power cycle the amp.
Hum from the speakers
• Hum may be caused by a ground loop between two
of the other components in the system. To test for
another ground loop, try reversing the AC plugs of
each of the components in the system.
Hum from the speakers • Check for faulty cables, faulty source material, an
ungrounded phono system or a defective component.
Amp will not turn on
• AC power cord must be plugged into a working outlet.
• Master power switch must be on.
• Be sure the IEC power cord is fully seated into the
amp’s chassis.
• Check external changeable fuse located on the rear
Bass sound is weak and the
stereo image is “phasey” or
“blurry” sounding in one room
• The loudspeakers are wired out of phase. Reverse the
connections at the back of one speaker.