Velodyne SUBCONTRACTOR SC-600 Amplifier User manual

SC-600 Amplifier
SubContractor™Series
USER’S
MANUAL
SC-600 Amplifier,SC-600 IW,
SC-600 IF/IC Subwoofers

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Caution!
IMPORTANT SAFETY INSTRUCTIONS
Caution
To reduce the risk of electric shock, do not remove cover (or back). No user-serviceable parts inside. Refer
servicing to qualified service personnel.
The lightning flash with arrowhead symbol is intended to alert the user to the presence of uninsulated
“dangerous voltage” within the product’s enclosure that may be of sufficient magnitude to constitute a risk
ofelectric shock to persons.
The exclamation point symbol is intended to alert the user to the presence of important operating and
maintenance (servicing) instructions in the literature accompanying the subwoofer.
1. Read Instructions — All safety and operating instructions should be read before the product is operated.
2. Retain Instructions — The safety and operating instructions should be retained for future reference.
3. Heed Warnings — All warnings on the product and in the operating instructions should be
adhered to.
4. Follow Instructions — All operating and use instructions should be followed.
5. Water and Moisture — The product should not be used near water — for example, near a bathtub,
washbowl, kitchen sink, laundry tub, in a wet basement, near a swimming pool or the like.
6. Carts and Stands — The product should be used only with a cart or stand recommended by
the manufacturer.
7. Wall or Ceiling Mounting — The product should be mounted to a wall or ceiling only as recommended
by the manufacturer.
8. Ventilation — The product should be situated so that its location or position does not interfere with its
proper ventilation. For example, the product should not be situated on a bed, sofa, rug, or similar surface
that may block the ventilation openings; or placed in a built-in installation such as a bookcase or cabinet
that may impede the flow of air through the ventilation openings.
9. Heat — The product should be situated away from heat sources such as radiators, heat registers,
stoves, or other products that produce heat.
10. Power Sources — The product should be connected to a power supply only of the type described in
the operating instructions or as marked on the product.
11. Grounding or Polarization — This product may be equipped with a polarized alternating-current line plug
(a plug having one blade wider than the other). This plug will fit into the power outlet only one way.
This is a safety feature. If you are unable to insert the plug fully into the outlet, try reversing the plug.
If the plug should still fail to fit, contact your electrician to replace your obsolete outlet. Do not defeat
the safety purpose of the polarized plug.
12. Power-Cord Protection — Power-supply cords should be routed so that they are not likely to be walked
on or pinched by items placed upon or against them, paying particular attention to cords at plugs,
convenience receptacles, and the point at which they exit from the product.
13. Cleaning — The product should be cleaned only as recommended by the manufacturer.
14. Nonuse Periods — The power cord of the product should be unplugged from the outlet when left unused
for a long period of time.
15. Object and Liquid Entry — Care should be taken so that objects do not fall and liquids are not spilled
onto the enclosure.
16. Damage Requiring Service — The product should be serviced by qualified service personnel when:
a. The power-supply cord or plug has been damaged.
b. Objects have fallen or liquid has been spilled into the product.
c. The product has been exposed to rain.
d. The product does not appear to operate normally or exhibits a marked change in performance.
e. The product has been dropped or damaged.
17. Servicing — The user should not attempt to service the product beyond what is described in the
operating instructions. All other servicing should be referred to qualified service personnel.
18. Lightning — For added protection for the product during a lightning storm or when it is left unattended
and unused for long periods of time, unplug it from the wall outlet.
19. Overloading — Do not overload wall outlets, extension cords or integral convenience receptacles as this
can result in a risk of fire or electric shock.
20. Attachments — Only use attachments and accessories specified by the manufacturer.
21. Voltage — Insure that the subwoofer is only connected to the rated source voltage. Do not connect the
120-volt version to 230-volts or vice-versa. This will result in damage to the subwoofer and possible
injury to the user.
CAUTION: To prevent electrical shock, match wide blade of plug to wide slot, fully inserted.

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Congratulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Product Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
–SC-600 Subwoofer Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
–SC-600 IW, SC-600 IF/IC Subwoofers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Setup Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
–Front Panel Controls and Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
–Rear Panel Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Rear Panel Connections - Detailed Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
–About Low-Pass Crossovers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
–AWord About Your Receiver’s Crossover and the SC-600 Amplifier Crossover . . . . . .8
–AWord About Interconnect Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
–AWord About Subwoofer Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Selecting the Subwoofer to be Controlled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Restore Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Care of Your Amplifier and Subwoofer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Troubleshooting and Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Appendix A: RS-232 Serial Overview and Commands . . . . . . . . . . . . . . . . . . . . . . . . .17
Velodyne Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Table of Contents

Congratulations
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Congratulations on your purchase of a Velodyne SubContractor Series (SC) 600 amplifier and
subwoofer. This system represents the state-of-the-art in low frequency reproduction. Read and
follow the instructions below to ensure safe and proper system operation.
Warning!
To prevent fire or shock hazard, do not expose this equipment to rain or moisture. To avoid
electrical shock, do not open the speaker enclosure or the amp chassis cover. Please observe
all warnings on the equipment itself. There are no user serviceable parts inside. Please refer
all service questions to your authorized Velodyne dealer.
Prior to Installation
Please unpack the system carefully. Please save the carton and all packaging materials
for future use. Record the serial number in the space provided on the warranty card for
future reference.
SC-600 SUBWOOFER AMPLIFIER
•Amplifier: 400 watts dynamic/200 watts RMS high efficiency, Class A/B
•DSP-controlled
•Four selectable presets for customized listening mode
•Automatic 5-band room equalizer (microphone included)
•Night-mode setting
•Mute control
•Line-level (RCA) inputs and outputs
•Speaker-level inputs with 5 way binding post connections
•Signal sensing auto turn on/off (defeatable)
•Variable volume control
•Selectable phase control (0, 90, 180 or 270 degrees)
•Built-in adjustable (30-160 Hz) digital low-pass crossover with 24 dB/octave slope
•Driver Displacement Control softwareto prevent over excursion and amp clipping
•Blue power indicator LED
•RS-232 Serial Interface
•12 Volt trigger
•Universal IR repeater mini-jack
•Automatically adjusted subsonic filter
Product Features

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SC-600 IW, SC-600 IF/IC SUBWOOFERS
SC-600 IW (In-Wall):
-Two high excursion 6.5” active drivers, two 12.5” x 3” oval
passive radiators with ribbed rubber surround
-High-excursion rubber surround
-2” dual layer inside/outside voice coil
-Frequency Response: 30 - 120Hz (+/- 3 dB)
-4ohm impedance
SC-600 IF/IC (In-Floor/In-Ceiling):
-12” (9.7” piston diameter) subwoofer
-2.5” dual layer inside/outside voice coil
-Oversized spider for linearity at high excursion
-High-excursion rubber surround
-Frequency Response: 25 - 120Hz (+/- 3 dB)
-4ohm impedance
Be sureto do the following to ensure the best performance from your subwoofer:
❑If possible, optimize the placement of the subwoofer(s) in the listening area.
See page 10 of the User’sManual.
❑Install and wire the subwoofer per the instructions on pages 3 - 8.
❑Select the proper model per the instructions on page 10.
❑Select the proper volume control. See page 4.
❑Be surethe low pass crossover is set correctly. See pages 8 - 9.
❑Be sure to equalize the subwoofer using the microphone and Auto-EQ feature.
See page 11.
❑Be sureto set the phase control on the remote. See page 11.
❑Select the correct preset for the source material. See page 13.
Your new Velodyne amplifier provides for a number of installation options. Read all the
installation information below in order to determine which installation option is best for your
system. Remember to perform all installation procedures with system power turned off.
Setup Checklist

FRONT PANEL CONTROLS AND DISPLAYS
FRONT PANEL CONTROLS AND DISPLAYS
Figure 1: Front Panel Connections of the SC-600 amplifier.
Following are brief descriptions of the controls described in Figure 1. More detail on these
controls can be found in the next section.
(1) Power Switch
This button forces your SC-600 amplifier into standby mode. The power LED turns amber,
the numeric LED shuts off, and the amplifier puts out no power. The unit will remain in this
mode until the POWER button is pressed again. Tofully deactivate (i.e. power down) the unit,
use the main power switch on the back panel.
(2) Power LED
This LED illuminates when the power is on. Blue is normal operation. It turns amber when
the unit is in standby mode or the remote has been used to deactivate the unit, and dims
when the unit is in night mode.
(3) Mic Input
Connect the supplied microphone for the Auto-EQ feature to this mini-jack input.
(4) Remote Eye
This is the eye that receives infrared commands from the supplied remote.
(5) Low-Pass Crossover
Use these up and down buttons to select the high-frequency range at which you wish to cut
off the signal to the subwoofer. The frequency is indicated on the LED display briefly, then
the display reverts to showing the subwoofer’svolume level. The slope is fixed at 24
dB/octave. To deactivate the crossover, press BOTH the up and down crossover buttons at
the same time – two dashes on the display indicate the crossover is deactivated and the
woofer plays all frequencies presented to it. Please see page 8 for a more detailed
discussion on crossovers.
Installation
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(6) LED Numeric Indicator
This LED supplies information on volume, crossover, woofer type, and other information. The
light button on the remote deactivates this display. Upon startup, the display shows the
model of subwoofer the SC-600 amp is controlling, then reverts to the volume indicator.
(7) Volume Control
These buttons allow you to balance the output from the subwoofer to the main speakers in
your system. The volume should be set to achieve similar volume level of both the main
speakers and subwoofer. The default volume is 30.
Note: Volume can also be controllable by using the supplied remote.
WARNING: Some manufacturers preset their receivers with the Sub-Out (A.K.A. LFE)
channel signal at a minimum level. It is very important to verify that your receiver Sub-Out
channel is set to the same output level as your front right and left channels. Refer to your
receiver manual for the individual channel level adjustment procedure. If your receiver
Sub-Out channel is set too low, the subwoofer may appear to have a weak output, it may
sound noisy or distorted, and the Auto On/Off feature may not operate properly.
(8) Optional Rack Mount Ears (Included)
These ears can be attached to the SC-600 amp to allow standard19” rack mounting.
REAR PANEL CONNECTIONS
Following are brief descriptions described in Figure 2. More detail on these controls can be
found in the next section.
Figure 2: Rear Panel Connections of the SC-600 amplifier.
(9) Thru Jacks
These RCA connectors are for passing along the same signal that goes into your subwoofer
to a second “daisy-chained” system. The signal from these RCA connectors is the same as
the input signal.
(10) Line Input / LFE Input
Connect these jacks to the LINE OUT preamp output, LFE output, or subwoofer output jacks
of your receiver/processor. If using the LFE output from your receiver or processor, plug
the single cable into the jack labeled LFE input or, for more signal, use a “Y” connector
(optional) and feed the signal into both “R” and “L” inputs. Examples of these types of
connections can be found in Figures 2A and 2B.
N10533

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Option 1
Figure 2A: Mono (LFE) Line-Level Connection.
Option 2
Figure2B: Stereo Line-Level Connection.
Line-Level
Subwoofer Signal
from Source (LFE)
Note: A “Y” Connector can
be used as an option.
Stereo Line-Level
Input from Source
Stereo Line-Level Output
to Another system, e.g. SC-600 IW
N10533
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(11) IR Input
An IR repeater can be connected to this mini-jack.
(12) 12V Trigger
When this mini-jack is connected, the unit remains in power-off mode until 12 volts is
supplied across the two leads. Polarity is irrelevant.
(13) RS-232 In
Use this port to communicate with an RS-232 controlled touch panel system. See Appendix
Afor an explanation of the use of the serial port, available commands, and their formats.
(14) Signal Sensing Auto On/Off Switch
With this switch in the “standby” position, your subwoofer can be safely left with the main
power switched on continuously. The subwoofer will turn itself on automatically when an audio
signal is present. If no signal is present for approximately 10 minutes, the unit will switch to
standby mode. While in standby mode, your subwoofer will draw very minimal power. This
function can be disabled by leaving the switch in the “always on” position.
(15) Speaker Level Input Terminals
Connect these input terminals to the speaker output terminals of your amplifier or receiver.
If you use this method of connection, when you go to the receiver speaker set up menu, make
sure you select the “large” speaker option.
(16) Speaker Level Output Terminals
These connections send a crossed-over speaker-level signal to the front speakers. When
connected in this fashion, your satellite speakers will be crossed over at 80 Hz. This removes
the lower bass frequencies from your satellites, enabling them to do a better job reproducing
high frequencies.
You may also connect your satellites directly to your receiver or amplifier along with the
subwoofer if you wish to bypass this crossover.
An example of a speaker-level connection is shown in Figure 3.

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Figure 3: Speaker-Level Connection.
(17) Subwoofer Connection Terminals
Connect the output terminals to the subwoofer being controlled by the SC-600 amplifier. Only
connect ONE subwoofer to the red/black pair of subwoofer output terminals - DO NOT
connect multiple subwoofers to the terminals in any configuration.
Caution!!!
Toavoid damage to your SC-600 amp and subwoofer,be sure to maintain correct polarity when
making all speaker connections; red (positive) to red, and black (negative) to black. Be sure that
all connections are tight, and that there are no loose strands or frayed wires.
(18) Power CordAdapter
Connect the detachable power plug to this male interface connection. The detachable cord
allows for easy replacement should the original become damaged.
(19) Fuse
If the unit is not functioning, check the fuse. If the fuse is blown, replace with an identically
rated fuse. If the fuse blows again, refer the unit for service.
(20) Main Power Switch
Press the POWER switch to the ON position to activate the amplifier.If the unit is to be left
unused for an extended period of time, move this switch to the OFF position to prolong the
life of the amplifier.
(21) 115V or 230V Operation Selectable Switch
This selectable voltage switch is factory preset for the correct voltage in the geographical
region in which the product is sold. To retain full Velodyne warranty coverage, this switch
should ONLYbe operated by a Velodyne factoryauthorized service representative during a
FULL factory-authorized mains voltage change procedure. Should anyone other than a
Velodyne factoryauthorized service representative attempt to perform a mains voltage
change in any way, the warranty for the product will be terminated. In this case, Velodyne
assumes no liability for any and all injuries to any persons involved, or for any property
damage, whether to the subwoofer or any other property involved or damaged as a result of
this unauthorized mains voltage change.

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The SC-600 amplifier is equipped with both speaker-level and line-level inputs. Use the
RCA/Phono type “INPUT” jacks when connecting from a pre-amp, signal processor, or line-level
crossover. The “SPEAKER LEVEL INPUT” jacks connect directly to the speaker outputs of an
integrated amplifier or receiver. Your amplifier section will notice no additional loading effects
when you use these inputs because of their high impedance.
Note: Do not use both the RCA/Phono “INPUT” connections and “SPEAKER LEVEL INPUT”
connections simultaneously.
ABOUT LOW-PASS CROSSOVERS
All of the SC-600 amplifier inputs sum the left and right channels together and the resulting
signal is passed through an adjustable low-pass crossover before being amplified. The crossover
control allows you to adjust the upper limit of the subwoofer’s frequency response from 30 to
160 Hz. The subwoofer’s response will begin rolling off above the frequency you set this control
to. The slope is 24 dB/octave.
You should set the crossover frequency to obtain a smooth and seamless transition from the
subwoofer to the main speakers in your system. If your main speakers are smaller units with
limited low frequency output, you may wish to choose a higher frequency (such as 100-120 Hz)
than you would with larger speakers which have greater low frequency output. The SC-600
amp’s crossover has a default of 80 Hz.
Most receivers and processors provide an option to characterize main speakers as “large” or
“small” speakers. This will affect the speaker’s crossover point. We recommend in most cases
setting the main speakers to “small,” despite their size and frequency response characteristics.
This is because the powerful 400 watt SC-600 amp combined with the SC-600 subwoofer you
have acquired are more likely suited to low bass reproduction than your amp and main
speaker.With the burden of low frequency reproduction relieved, your speakers will exhibit
better performance.
Disabling the Low-Pass Crossover (Subwoofer Direct)
If your receiver/processor provides a crossover to the subwoofer, you may want to bypass
/switch off the SC-600 amp’s low-pass crossover. To do this, depress BOTH the Crossover UP
and Crossover DOWN buttons simultaneously. The numeric LED will show indicating that
the low-pass crossover has been defeated. To reactivate the low-pass crossover, simply push
the crossover UP or crossover DOWN buttons.
AWORD ABOUT YOUR RECEIVER’S CROSSOVER
AND THE SC-600 AMPLIFIER CROSSOVER
Your Velodyne SC-600 amplifier is designed to operate using the full range audio signal for
input when using the built-in crossover. Many home theater processors/receivers have a
“subwoofer out” jack that performs this same function and are designed to be used with
apowered subwoofer.
--
Rear Panel Connections — Detailed Explanation

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Inthese installations, you may want to bypass the crossover in either the processor or the
Velodyne SC-600 amplifier as described above. However, in some cases you may want to use
BOTH crossovers. If you choose to do this you should stagger the frequencies, (i.e., 120 Hz
subwoofer, 80 Hz processor) for best results.
Note: If not using an external crossover, you should use the built-in crossover for optimal
performance. When using a single RCA sub out from the processor, it does not matter which
line level input (L/R) is used.
AWORD ABOUT INTERCONNECT CABLES
When installing your Velodyne SC-600 amplifier using the line-level connections, you should
always use high quality shielded interconnect cables. It is recommended that you keep the
length of cable as short as possible to avoid any potential external interference problems.
When connecting the SC-600 amplifier to your subwoofer, use a quality speaker cable that is
at least 14-gauge. Be very careful to avoid any loose or frayed strands that could result in a
short, causing a dangerous condition and possible damage to your unit. Cables of extremely
large size are typically not required. Extremely large gauge wire may not properly fit in the
binding posts, resulting in a poor connection and possible short circuits.
AWORD ABOUT SUBWOOFER PLACEMENT
Subwoofers operate at extremely low frequencies, which are primarily omni-directional. Keep in
mind that frequency response and output level can be drastically influenced by room placement,
depending on the acoustic properties of the listening room. Typically, the optimum
location for a subwoofer is in a front corner of your listening room. This location will usually
offer the greatest output levels and optimum low frequency extension. Typically, a minimum
distance of one to two feet from your TV to the subwoofer will be adequate to avoid any
magnetic interference.
Remember that the built-in 5-band EQ will help to get the most performance out of your
subwoofer no matter whereit is placed.
Caution!
This amplifier is an electronic device. Do not place the amplifier next to sources of heat such
as furnace registers, radiators, etc. Likewise, do not place the amplifier near sources of
excessive moisture, such as evaporative coolers, humidifiers, etc. The power cord should be
routed in such a way that it will not be walked on, pinched or compressed in any way that could
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Your SC-600 amplifier can control the Velodyne SC-600 Series subwoofers as well as generic
passive subwoofers. Special internal software settings are designed to maximize performance
and reliability depending on the model of subwoofer being controlled, so it is important to match
the SC-600 amplifier with the subwoofer it is controlling. The SC-600 amplifier comes with a
default setting for the SC-600 IW subwoofer. When the unit is first powered up, the model
being controlled is displayed for two seconds on the numeric LED before the display reverts to
the volume setting. The subwoofer to be controlled is shown as follows:
Note: Both the IF and the IC settings control the SC-600 In-Floor/In-Ceiling (IF/IC) subwoofer
and have identical internal settings.
Tochange the subwoofer to be controlled, first power down the amplifier using the main power
switch on the back panel (DO NOT use the power button on the front panel). Then, turn the
switch on while depressing any of the buttons on the front panel (crossover up or down, or
volume up or down). The unit will show the model it is currently controlling. To change the
model, simply push the crossover up or crossover down buttons and the model changes on the
LED display. Once the desired model is seen on the LED display, simply release the button. You
don’t need to do anything else - the model to be controlled is automatically stored in the
SC-600 amp’smemory. To exit model selection mode, use the main power switch on the back
panel to power down and power up the unit. You should see the model you selected for two
seconds on the LED display before the display reverts to the volume.
Note: The SC-600 amplifier can control only one subwoofer at a time, either the SC-600 IW
or SC-600 IF/IC.
Selecting the Subwoofer to be Controlled
Model LED Display
SC-600 IW (In-Wall) IW
SC-600 IF (In-Floor) IF
SC-600 IC (In-Ceiling) IC
Generic Subwoofer GS

This section addresses day-to-day usage of your SC-600 amplifier.
Remote Control
The features of the SC-600 remote control are listed below.
•POWER — This button forces your SC-600 amplifier unit into
standby mode. The power LED turns amber, the numeric LED
shuts off, and the amplifier puts out no power. The unit will
remain in this mode until the POWER button is pressed again.
To fully deactivate (i.e. power down) the unit, use the main
power switch on the back panel.
Note: The master power switch on rear panel must be on in
order for the front power button to function.
•MUTE — This button mutes the subwoofer’s output. The LED
on the amplifier will show 00 if the unit is muted. To unmute
the subwoofer, press the MUTE button again and the original
volume setting shows on the LED.
•EQ — This button automatically EQs the subwoofer using a 5-band internal graphic equalizer.
Touse this feature, first plug the supplied microphone into the Mic-In jack on the front panel
of the amplifier and place the mic in your preferred listening position. Then press EQ on the
remote for about 2-3 seconds. The subwoofer emits 12 “sweep tones” that cover the
frequencies between 20 and 150 Hz. The LED displays “AU” during the Auto-EQ process.
After the sweeps are complete, the unit saves its EQ settings and returns to normal
operation. Toprevent accidental invocation of the EQ feature, you must hold down the EQ
button for 2-3 seconds before the EQ sweeps begin.
Note: Each time the EQ feature is utilized, the EQ settings for the SC-600 amplifier are reset.
If the microphone is not plugged in, the SC-600 amplifier will emit one or two sweep tones then
cease the EQ operation. In this case, the previous EQ settings will be preserved.
•PHASE — These buttons allow you to optimize the subwoofer performance for the location
and your listening position. Play some bass heavy music. While listening, push one of the four
phase buttons, listen for a few moments, and then press the next phase button. In most
installations, one of the four button positions will offer an audibly better blend of subwoofer
and speakers. Selecting the correct phase position is just that easy. The LED will show the
phase selected by showing “PH” followed by the phase number: 0, 90, 180 or 270.
•LIGHT — If you wish, you can deactivate the numeric LED on your SC-600 amplifier. To
do this, press the LIGHT button on your remote. To reactivate the LED, press the LIGHT
button again.
•NIGHT — Night mode limits the maximum output of the subwoofer for late night listening
or to be more considerate of close neighbors. Press the night button to turn the night
mode featureon or off. Night mode, when active, will reduce the brightness of the blue LED.
•VOLUME CONTROL — This control allows you to balance the output from the subwoofer to
the main speakers in your system. This control should be set to achieve similar volume level
of both the main speakers and subwoofer. When pressing volume up or down, the volume
level is shown on the numeric LED on the front panel.
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Usage
Figure5: SC-600 Remote.

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WARNING: Some manufacturers preset their receivers with the Sub-Out channel signal at a
minimum level. It is very important to verify that your receiver Sub-Out channel is set to the
same output level as your front right and left channels. Refer to your receiver manual for the
individual channel level adjustment procedure. If your receiver Sub-Out channel is set too low,
the subwoofer may appear to have a weak output, it may sound noisy or distorted, and the
Auto On/Off feature may not operate properly.
Note: The volume can also be adjusted via the volume buttons on the front panel of the
amplifier. These buttons have the same effect as pressing the up and down volume buttons on
your remote.
•PRESETS — There are four presets, consisting of Movies, R&B – Rock, Jazz – Classical, and
Games. As a preset is chosen, the preset is shown on the numeric LED as P1 for preset 1,
P2 for preset 2, etc. The presets provide the following characteristics for bass reproduction:
Movies: Maximum output and impact for explosions and other
action adventure movie content.
R&B – Rock: Provides the driving bass found in today’s rock music.
Jazz – Classical: The tightest, cleanest, lowest distortion bass. The flattest frequency
response of the four presets.
Games: Maximum loudness available for the impact of video games.
Each preset has its own characteristics with respect to subsonic filter, volume differential and
asingle contour equalizer in order to optimize the listening mode for the preset.

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The following table indicates musical style and which preset is recommended for it.
MUSICAL STYLE SUGGESTED PRESET
Action Adventure Movies Movies
Country – Rock R&B – Rock
Country – Soft Jazz – Classical
Folk Jazz – Classical
Indie Music R&B – Rock
Pop R&B – Rock
Rock R&B – Rock
Alternative Rock Jazz – Classical
Blues Jazz – Classical
Broadway and Vocalists Jazz – Classical
Children’s Music Jazz – Classical
Christian and Gospel Jazz – Classical
Classic Rock R&B – Rock
Classical Jazz – Classical
Dance and DJ R&B – Rock
Hard Rock/Heavy Metal R&B – Rock
Latin Music R&B – Rock
Miscellaneous Jazz – Classical
Movies – Non-Action Adventure Jazz – Classical
New Age Jazz – Classical
Opera and Vocal Jazz – Classical
R&B R&B – Rock
Rap and Hip-Hop R&B – Rock
Soundtracks R&B – Rock or Jazz – Classical
Video Games Games

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Restoring Defaults
Care of your Amplifier and Subwoofer
There is a feature that allows you to restore default settings for your SC-600 amplifier. By
pressing presets in EXACTLY the following order on the remote, the unit’s power light will blink
indicating that you have restored defaults.
Preset 1: Movies
Preset 2: R&B – Rock
Preset 3: Jazz – Classical
Preset 4: Games
Preset 4: Games
Preset 3: Jazz – Classical
Preset 2: R&B – Rock
Preset 1: Movies
When you press the presets in the above order, the numeric LED will display “P3” indicating that
you have restored defaults. The unit’s volume is reset to level 30 out of 80.
Do not use any harsh detergents or chemicals to clean the SC-600 chassis or the subwoofer
cabinet. Abrasives, detergents, or cleaning solutions will damage the finish on the SC-600
chassis or the subwoofer cabinet. We recommend using a damp cloth to clean the front, back
and sides.
During normal conditions, the amplifier may be left on continuously without any problems. If you
plan to leave the unit unused for an extended period of time, we recommend that you turnoff
the unit by the master power switch on the front panel.

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Before seeking service for your amplifier or subwoofer, please re-check all systems. Following
is a simple troubleshooting guide to assist you.
1. Verify that the unit is plugged in and power outlet used is active.
2. Is the power switch on?
3. Is the unit receiving an input signal from your source?
4. Have all controls on the amplifier (volume, crossover, phase, etc.) been properly set?
5. If the unit has been running at high levels, one of the protection circuits may be engaged.
Has the amplifier overheated?
6. Has the power button been depressed on the remote?
7. Is the remote non-responsive? We recommend replacing the batteries in the remote.
If the protection circuitry is active, the unit may cycle on and off until operating parameters
return to normal. Under more serious conditions, the unit may shut off completely. Normal
operation should return upon cooling, but you may be required to turn the power off and then
on again to reset the unit.
The following conditions require service by a qualified technician:
1. The power cord has become damaged
2. The unit does not appear to operate normally or exhibits a marked
change in performance
3. The unit has been exposed to water
4. Some partof the chassis or circuitry is physically damaged
Thank You for Purchasing an SC-600 Amplifier!
Troubleshooting and Service

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Specifications SC-600 IW (In-Wall) SC-600 IF/IC (In-Floor/In-Ceiling)
Woofer: Two 6.5" active drivers
Two 12.5" x 3" passive radiators
12" (9.7" piston diameter) subwoofer
Frequency Response:
(+/-3 dB)
37-120Hz 25-120Hz
Harmonic Distortion: <5% (typical) <5% (typical)
Magnet Structure: 56 oz.
(3.5 lbs.)
Voice Coil: 2” Dual Layer
inner/outer wind
2.5" Dual layer
inner/outer wind
Dimensions (H/W/D):
(inc. feet & grille)
16.5" x 14.25" x 3.75"
(42 x 36 x 10 cm)
**excludes grilles, mounting tabs, etc.
9.3" x 14.0" x 34"
(24 x 36 x 86 cm)
**Allow 1-2 extra inches in depth for wire
Cabinet: Active/Passive Slotted bass reflex enclosure
Warranty:
(parts/labor)
22 lbs. (9 Kg) 40 lbs. (18 Kg)
Specification SC-600 Subwoofer Amplifier
Amplifier:
(Class A/B)
400 watts Dynamic
200 watts RMS Power
High Pass Crossover: 80Hz (6 dB/octave)
Low Pass Crossover: 30Hz-160Hz, Defeatable,
24dB/octave slope
Inputs: Line and Speaker Level
Outputs: Line-level, 80 Hz up,
speaker level
Phase: 0°, 90°, 180°, 270°
Dimensions (H/W/D):
(inc. feet & grille)
4.25" x 17.0 " x 13.0"
(11 x 43 x 33 cm)
**Allow two extra inches in depth for wire
connectors and power cable.
**Includes feet. Feet can be removed for
rack mount use. Unit is approximately
“two rack units” high.
Warranty:
(parts/labor)
Shipping Weight:
(approx.) 25 lbs. (22.7 Kg)
The following subwoofers are designed to work with the SC-600 amplifier:
Shipping Weight:
(approx.)
64 oz (4 lbs) each
active / 128 oz (8 lbs) total
Three years (electronics - parts and labor),
Five years (drivers - parts and labor)
Three years (electronics - parts and labor),
Five years (drivers - parts and labor)
Three years (electronics - parts and labor),
Five years (drivers - parts and labor)
Specifications

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Appendix A: RS-232 Serial Overview and Commands
Introduction
This document outlines Velodyne’s SubContractor (SC) RS-232 protocol specification. This
protocol indicates how SC products receive run-time commands from devices such as Creston
Universal Remote Controls.
Com Port Setup
Use standard communications settings: Baud Rate: 9600, Data Bits: 8, Parity: None,
Stop Bits: 1
SC IN and OUT Port Pin Configuration
SC serial ports use a standard configuration that allows direct connection to a PC via a FEMALE
to MALE serial cable. It uses only three pins (Transmit, Receive, Ground).
The pin configurations are:
IN: Pin 2 = Transmit
Pin 3 = Receive
Pin 5 = Ground
OUT: Pin 2 = Receive
Pin 3 = Transmit
Pin 5 = Ground
Runtime Command Format
Byte Number Byte Description Notes
0 ‘#’ Header Character
1to 3 or 4 Command and 3 to 4 ASCII characters see formats below
Parameter Data Case sensitive -CAPS ONLY!
4 or 5 ‘$’ Termination Character (required or
command is ignored)