Velodyne Subcontractor SC-IW User`s manual

Amplifier /
S C - 1 2 5 0 A m p l i f i e r,
SC-8, SC-10, SC-12, SC-15,
S C - I W, S C - I F, S C - I C S u b w o o f e r s
SubContractor User’s Manual
At t e n t i o n !
SubContractor User’s Manual
Vo r s i c h t !
SubContractor User’s Manual
At t e n z i o n e !
SubContractor User’s Manual
Ta b l e o f C o n t e n t s
Congratulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Product Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
– SC-1250 Subwoofer Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
– SC-8, SC-10, SC-12, SC-15, SC-IW, SC-IF Woofers . . . . . . . . . . . . . . . . . . . . . . . . .2
Setup Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
– Front Panel Controls and Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
– Rear Panel Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
– About Low-Pass Crossovers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
– A Word About Your Receiver’s Crossover and the SC-1250 Crossover . . . . . . . . . . .10
– A Word About Interconnect Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
– A Word About Subwoofer Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Selecting the Subwoofer(s) to be Controlled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
– Using the SC-1250 to Drive Two Subwoofers . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Restore Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Care of Your Amplifier and Subwoofer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
– Troubleshooting and Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Appendix A: RS-232 Serial Overview and Commands . . . . . . . . . . . . . . . . . . . . . . . . .18
SubContractor User’s Manual
Congratulations on your purchase of a Velodyne SubContractor Series subwoofer. This system
represents the state-of-the-art in low frequency reproduction. Read and follow the instructions
below to insure safe and proper system operation.
To prevent fire or shock hazard, do not expose this equipment to rain or moisture. To avoid
electrical shock, do not open speaker enclosure or 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. Remove all staples used to seal the carton as they can
scratch the chassis. 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.
Product Features
SC-1250 Subwoofer Amplifier
Amplifier: 3000 watts dynamic/1250 watts RMS high efficiency, Class D
4 selectable presets for customized listening mode
Automatic 7 band room equalizer (microphone included)
Night-mode setting
Mute control
Adjustable (30 to 160 Hz) low-pass crossover (defeatable)
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 digital low-pass crossover with 24 dB/octave slope
Driver Displacement Control software to prevent over excursion and amp clipping
Blue power indicator LED
RS-232 Serial Interface
12 Volt trigger
Universal remote input jack
Ability to drive up to TWO subwoofers**
** If two subwoofers are driven, they must each have 8 ohm or higher impedence. SC Series
subwoofers can be run in this fashion. If a more traditional 4 ohm subwoofer is driven with the
SC-1250, only one can be driven.
SubContractor User’s Manual
S C - 8 , S C - 1 0 , S C - 1 2 , S C - 1 5 , S C - I W, S C - I F / I C S u b w o o f e r s
8” (6.5” piston diameter) subwoofer
2.5” high-temp voice coil
Oversized spider for linearity at high excursion
High-excursion EPDM rubber surround
107 ounce magnet/204 ounce motor structure
Frequency Response: 28 - 120 Hz (+/- 3 dB)
8 ohm impedance
10” (8” piston diameter) subwoofer
3” high temperature inside/outside voice coil
Oversized spider for linearity at high excursion
High-excursion EPDM rubber surround
162 ounce magnet/346 ounce motor structure
Magnetically shielded for video use
Frequency Response: 24 - 120Hz (+/- 3 dB)
8 ohm impedance
12” (9.7” piston diameter) subwoofer
3” high temperature inside/outside voice coil
Oversized spider for linearity at high excursion
High-excursion EPDM rubber surround
162-ounce magnet/346 ounce motor structure
Magnetically shielded for video use
Frequency Response: 22 - 120Hz (+/- 3 dB)
8 ohm impedance
15” (12.7” piston diameter) subwoofer
3” high temperature inside/outside voice coil
Oversized spider for linearity at high excursion
High-excursion EPDM rubber surround
162-ounce magnet/346 ounce motor structure
Magnetically shielded for video use
Frequency Response: 22 - 120Hz (+/- 3 dB)
8 ohm impedance
SC-IW (In-Wall):
- 4” x 14” rectangular driver (3” x 13.25” piston diameter) with flat Carbon
Fibre/Rohacell/Carbon Fiber sandwich diaphragm
- Neodymium magnet structure
- Quad spider configuration with upper/lower spider modules
- High-excursion EPDM rubber surround
- 3” high temperature inside/outside voice coil
- Magnetically shielded for video use
- Frequency Response: 22 - 120Hz (+/- 3 dB)
- 8 ohm impedance
SubContractor User’s Manual
SC-IF/SC-IC (In-Floor/In-Ceiling):
- 12” (9.7” piston diameter) subwoofer
- 3” high temperature inside/outside voice coil
- Oversized spider for linearity at high excursion
- High-excursion EPDM rubber surround
- 162 ounce magnet/346 ounce motor structure
- Magnetically shielded for video use
- Frequency Response: 22 - 120Hz (+/- 3 dB)
- 8 ohm impedance
Setup Checklist
Be sure to do the following to ensure the best performance from your subwoofer(s):
❑ If possible, optimize the placement of the subwoofer(s) in the listening area.
See page 11 of the User’s Manual.
❑ Install and wire the subwoofer per the instructions on pages 3 - 9.
❑ Select the proper model per the instructions on page 11.
❑ Be sure the low pass crossover is set correctly. See pages 9 - 10.
❑ Be sure to equalize the subwoofer using the microphone and Auto-EQ feature.
❑ Be sure to set the phase control on the remote. See page 12.
❑ Select the correct preset for the source material. See pages 13 – 14.
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.
I n s ta l l a t i o n
2 3
Figure 1: Front Panel Connections of the SC-1250.
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 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. This LED
dims when the unit is in night mode.
(2) Power Switch
This push button style switch is the main on/off for the unit.
SubContractor User’s Manual
(3) Mic Input
Connect the supplied microphone for the Auto-EQ feature to this mini-jack.
(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’s volume. 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 9 for a more detailed discussion
on crossovers.
(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-1250 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 from between both
the main speakers and subwoofer. The default volume is 30.
Note: Volume is also controllable by using the supplied remote.
(8) Optional Rack Mount
These detachable ears allow the SC-1250 to be rack mounted.
SubContractor User’s Manual
Figure 2: Rear Panel Connections of the SC-1250.
(9) Thru Jacks (See Figure 3A)
These RCA connectors are for passing along the same signal that goes into your subwoofer
to a second “daisy-chained” subwoofer. The signal from these RCA connectors is the same
as the input signal.
(10) Line Input / LFE Input (See Figure 3A & 3B)
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 (not
included) and feed the signal into both “R” and “L” inputs.
Option 1
Figure 3A: Mono (LFE) Line-Level Connection.
SubContractor User’s Manual
Option 2
Figure 3B: Stereo Line-Level Connection.
SubContractor User’s Manual
(11) Balanced XLR LFE Input (See Figure 4)
This XLR input jack receives the balanced LFE signal from your receiver or processor.
Figure 4: Balanced Line-Level Connection.
(12) Mic Input
Connect the supplied microphone for the Auto-EQ feature to this mini-jack.
(13) IR Input
This is a connection that allows the utilization of a third party infrared remote sensor,
such as Elan or Xantech, or an extended cable for placement closer to your other
remote controlled equipment. This keeps you from awkward control angles using the infrared
remote control.
(14) 12V Trigger
When this 2-conductor mini jack is connected, the amplifier remains in power-off mode until
the trigger is applied. The correct trigger is +12V on the tip of the connector relative to the
grounded sleeve.
(15) RS-232 In
Use this port to communicate with a touch panel remote control. See Appendix A for an
explanation of the use of the serial port, available commands, and their formats.
SubContractor User’s Manual
(16) Auto ON/OFF Switch
Use this switch to select between auto-on active and auto-on inactive (constant on) operation.
For maximum amplifier life, we recommend the Auto ON/OFF “Active” setting.
(17) Speaker Level Output Terminals (See Figure 5)
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 and giving your receiver’s amp more headroom (up to 50%
more power).
You may also connect your satellites directly to your receiver or amplifier along with the
subwoofer if you wish to bypass this crossover.
Figure 5: Speaker-Level Connection.
SubContractor User’s Manual
(18) Speaker Level Input Terminals (See Figure 5)
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.
(19) Subwoofer Connection Terminals
Connect these output terminals to the subwoofer(s) being controlled by the SC-1250. Only
connect ONE subwoofer per red/black pair of subwoofer output terminals - DO NOT connect
the subwoofers in a “daisy chain” configuration.
Note: SC series subwoofers are designed so that TWO subwoofers can be driven from a
single SC-1250 amplifier. If you are using the SC-1250 to power a non-SC subwoofer, make
sure you check the resistance of the subwoofer’s voice coil. A SINGLE 4 ohm subwoofer can
be driven with the SC-1250, but not TWO 4 ohm woofers. If you attempt to run more than a
single 4 ohm subwoofer, internal protection circuitry will activate within the SC-1250.
To avoid damage to your SC-1250, be sure to maintain correct polarity when making all
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.
(20) Power Cord Adaptor
Connect the detachable 117V~60Hz 15A AC power plug to this male interface connection.
The detachable cord allows for easy replacement should the original be damaged.
(21) 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.
(22) Master 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.
The SC-1250 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-1250 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.
SubContractor User’s Manual
You should set the crossover frequency to obtain a smooth and seamless transition from the
subwoofer(s) 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. With larger
speakers, you might start with this control set lower, such as 80 Hz. The SC-1250 crossover
has a default of 80 Hz.
Most receivers and processors provide an option to characterize main speakers as “large” or
“small.” This affects the 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 1250 watt SC-1250 combined with the SC subwoofer(s) you have acquired are
more than likely more suited to low bass reproduction than your amp and main speaker
combination. With the burden of low frequency reproduction relieved, your amplifier and main
speaker combination will enjoy better performance and about 50% more available headroom,
enabling them to more accurately reproduce the rest of the frequency spectrum.
Disabling the Low-Pass Crossover (Subwoofer Direct)
If your receiver/processor provides a crossover to the subwoofer(s), you may want to bypass
the SC-1250’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.
A W o r d A b o u t Yo u r R e c e i v e r ’ s C r o s s o v e r
and the SC-1250 Crossover
Your Velodyne SC-1250 amplifier is designed to operate using the full range audio signal for
input when using the built-in crossover. Many home theater processors/receivers (Dolby
Digital®, DTS®, THX™) have a “subwoofer out” jack that performs this same function and are
designed to be used with a powered subwoofer.
In these installations, you may want to bypass the crossover in either the processor or the
Velodyne SC-1250 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.
A Wor d About Inter connect Cables
When installing your Velodyne SC-1250 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-1250 to your subwoofer(s), 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.
SubContractor User’s Manual
A Wor d 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 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. The worst location for a
subwoofer is typically far away from any walls, close to the center of your room and near an
opening or doorway. Avoid these locations when possible. When using a pair of SC subwoofers
in stereo, it is preferable to place each subwoofer by the satellite of the same channel. 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 7 band EQ will help to get the most performance out of your
subwoofer no matter where it is placed.
This amplifier has electronics built into the cabinet. 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 result in damaging the insulation or wire.
Selecting the Subwoofer(s) to be Controlled
Your SC-1250 can control a variety of Velodyne SubContractor 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-1250 amplifier with the
subwoofer(s) it is controlling. The SC-1250 comes with a default setting for the SC-10 subwoofer. When the
unit is first powered up, the model being controlled is displayed for 2 seconds on the numeric LED before the
display reverts to the volume setting. The subwoofer to be controlled is shown as follows:
LED Display
LED Display
S C - I n - Wa l l ( S C - I W )
SC-In-Floor (SC-IF)
SC-In-Ceiling (SC-IC)
G e n e r i c S u b w o o f e r **
** - The generic subwoofer setting is for passive subwoofers not on the above list. CAUTION: there is no anticlipping or anti-distortion protection on this setting.
To change the subwoofer to be controlled, first power down the amplifier using the 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-1250’s
SubContractor User’s Manual
memory. To exit model selection mode, use the power switch on the back panel to power down and power up
the unit. You should see the model you selected for 2 seconds on the LED display before the display reverts
to the volume.
Using the SC-1250 to Drive Two Subwoofers
Once the model selection process is completed, no other adjustments are needed to enable the SC-1250 to
drive one or two subwoofers.
This section addresses day-to-day usage of your SC-1250 amplifier.
Remote Control
The features of the SC-1250 remote control are listed below.
• POWER — This button forces your SC-1250 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, press the power switch
on the front 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. 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.
Figure 6: SC-1250 Remote.
• EQ — This button automatically EQs the subwoofer using a 7 band internal graphic equalizer.
To use this feature, first plug the supplied microphone into the Mic-In jack on the back panel
of the subwoofer and place the mic in your preferred listening position. Then, by pressing EQ
on the remote, 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. To prevent
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-1250 are reset. If the
microphone is not plugged in, the SC-1250 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. Select the switch position at which you hear the most bass. The
LED will show the phase selected by showing “PH” followed by the phase number.
• LIGHT — If you wish, you can deactivate the numeric LED on your SC-1250. To do this, press
the LIGHT button on your remote. To reactivate the LED, press the LIGHT button again.
SubContractor User’s Manual
• NIGHT — Night mode limits the maximum dynamic 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 feature on or off. Activation of night mode causes “n” to appear briefly on
the display. When night mode is deactivated, the display shows “n off” and then returns to
normal function.
• 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
from between 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.
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 4 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:
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.
Maximum loudness available for the impact of video games.
SubContractor User’s Manual
The following table indicates musical style and which preset is recommended for it.
Action Adventure Movies
Country – Rock
Country – Soft
Indie Music
Alternative Rock
Broadway and Vocalists
Children’s Music
Christian and Gospel
Classic Rock
Dance and DJ
Hard Rock/Heavy Metal
Latin Music
– Non-Action Adventure
New Age
Opera and Vocal
Rap and Hip-Hop
Video Games
R&B – Rock
Jazz – Classical
Jazz – Classical
R&B – Rock
R&B – Rock
R&B – Rock
Jazz – Classical
Jazz – Classical
Jazz – Classical
Jazz – Classical
Jazz – Classical
R&B – Rock
Jazz – Classical
R&B – Rock
R&B – Rock
R&B – Rock
Jazz – Classical
Jazz – Classical
Jazz – Classical
Jazz – Classical
R&B – Rock
R&B – Rock
R&B – Rock or Jazz
– Classical
SubContractor User’s Manual
Each preset has its own characteristics with respect to subsonic filter, volume differential and
a single equalizer (EQ) in order to optimize the listening mode for the preset.
R e s t o r i n g D e fa u l t s
There is a feature that allows you to restore default settings for your SC-1250. By pressing
presets in EXACTLY the following order on the remote, the unit’s power light will blink indicating
that you have restored defaults.
R&B – Rock
Jazz – Classical
Jazz – Classical
R&B – Rock
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.
C a r e o f yo u r A m p l i f i e r a n d S u b w o o f e r
Do not use any harsh detergents or chemicals to clean the SC-1250 chassis or the subwoofer
cabinet. Abrasives, detergents, or cleaning solutions will damage the finish on the SC-1250
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 turn off
the unit by the master power switch on the front panel.
SubContractor User’s Manual
T roubleshooting and Service
Before seeking service for your amplifier or subwoofer, please re-check all systems. Following
is a simple troubleshooting guide to assist you.
Verify that the unit is plugged in and power outlet used is active.
Is the power switch on?
Is the unit receiving an input signal from your source?
Have all controls (volume, crossover, phase, etc.) been properly set?
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. Make sure binding posts are tightened.
8. 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 part of the chassis or circuitry is physically damaged
Thank You for Purchasing an SC-1250 Amplifier!
SubContractor User’s Manual
SubContractor User’s Manual
Appendix A: RS-232 Serial Overview and Commands
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:
Pin 2 = Transmit
Pin 3 = Receive
Pin 5 = Ground
Pin 2 = Receive
Pin 3 = Transmit
Pin 5 = Ground
Runtime Command Format
Byte Number
Byte Description
Header Character
1 to 3 or 4
Command and
Parameter Data
3 to 4 ASCII characters see formats below
Case sensitive - CAPS ONLY!
4 or 5
Termination Character (required or
command is ignored)
SubContractor User’s Manual
RS232 Commands
n Values
Volume Control
00 – 80
Sets volume to a value,
increments volume up
or down, or requests
current volume setting
Preset Control
1, 2, 3, 4
#PS1$, #PS2$,
#PS3$, #PS4$,
Activates the indicated
preset, or requests
the current preset
Logo Light
0: Light Off
1: Light On
Turns the Logo Light
on or off, or requests
light state
Night Mode
0: Night
Mode Off
1: Night
Mode On
Night Mode, or
requests light
mode state
Mute Control
0: Mute Off
1: Mute On
Mutes/Unmutes the
woofer, or requests
mute state
Power Control
0: Power Off
1: Power On
Powers On/Powers
Off the woofer, or
requests power state
SubContractor User’s Manual
Velodyne Products
115 - 120V
DD ® Series
Digital Drive 1812
Signature Edition
DEQ-R Series
DLS™-R Series
DLS -3500R
DLS -3750R
DLS -4000R
DLS -5000R
Impact Series
Impact - Mini
Impact -10
Impact -12
220 - 240V
MiniVee 10
Optimum Series
SC-600 Amp
SC-602 Amp
SC-600 IW
SC-600 IF/IC
DD ® Series
Digital Drive 1812
Signature Edition
CHT-Q Series
Impact Series
Impact - Mini
Impact -10
Impact -12
SPLi Series
SPL-Ultra Series
SPL-800 Ultra
SPL-1000 Ultra
SPL-1200 Ultra
SC-600 Amp
SC-602 Amp
SC-600 IW
SC-600 IF/IC
SMS™ -1
SubContractor User’s Manual
VELODYNE ACOUSTICS, Inc. (“VELODYNE”) warrants all electronics for a period of three years, drivers for a period
of five years, and full range speakers for a period of five years. All VELODYNE products have a warranty from the
date of purchase against defects in materials and workmanship subject to the following conditions:
VELODYNE is not responsible for defects which result from the use of an amplifier or controller other than
the one originally supplied with the unit (subwoofer) or defects which result from modifications or repairs
made by any component of the system by anyone other than a VELODYNE factory authorized
service representative.
This warranty is void if any repairs or service covered by the terms of this warranty are made to any
component of the system by anyone other than a VELODYNE factory authorized service representative.
VELODYNE is not responsible for damage caused by accidents, abuse, misuse, natural or personal disaster
or unauthorized modification. The VELODYNE products are not intended for professional or commercial use
and VELODYNE is not responsible for damage resulting from such use.
The VELODYNE product warranty is limited to units that are purchased from authorized VELODYNE dealers
and finalized within authorized dealer locations.
This warranty is nontransferable under any condition.
Use of this product outside the U.S. and Canada voids this warranty.
Information regarding service may be obtained from the dealer from whom you purchased the unit, or by contacting
VELODYNE customer service. Warranty service must be performed by a VELODYNE factory authorized service
representative within the warranty period set forth above. If VELODYNE determines the unit is defective, VELODYNE
will, at VELODYNE’s option, repair or replace the product at no charge if the product is forwarded prepaid to a factory
authorized service representative. Products forwarded to the factory authorized service representative should be
shipped securely and properly packaged, insured and freight prepaid.
The Warranty of this product if it is sold to a consumer outside of the United States or Canada shall comply with
applicable law and shall be the sole responsibility of the distributor that supplied this product. To obtain any applicable
warranty service, please contact the dealer from which you purchased this product, or the distributor that supplied
this product.
Velodyne Acoustics, Inc.
345 Digital Drive
Morgan Hill, CA 95037
408.465.2800 voice
408.779.9227 fax
408.779.9208 service fax
Service E-mail:
Product E-mail:
Technical E-mail:
RevD JUN 2010
SubContractor User’s Manual