Velodyne Acoustics Speaker VA 9072 User Manual

"It delivered room-shaking bass and dramatically demonstrated the  
effectiveness of a single subwoofer placed to one side of the room"  
- Julian Hirsh  
Stereo Review, January 1997  
907.2  
"If you want the absolute-deepest, most feel it-in-your-tushy BASS  
under a grand, look no farther than the Velodyne . . ."  
Owner's Manual  
- Corey Greenberg  
Home Theater, February 1995  
Velodyne Acoustics, Inc.  
1070 Commercial St. Suite #101  
San Jose, CA 95112  
408.436.7270 voice  
408.436.7276 fax  
Audio/Video Subwoofer System  
Printed on recycled paper.  
 
continuously without any problems. The unit is equipped with a  
signal sensing turn on/off that will automatically turn on the unit  
when a signal is present at the inputs and turn off the unit after  
several minutes when there is no longer any signal at the inputs.  
Congratulations!  
Congratulations on your purchase of a Velodyne VA-907.2 sub-  
woofer system. This system represents the state of the art in  
accurate low frequency reproduction. Read and follow the instruc-  
tions below to insure safe and proper system operation.  
If you plan to leave the VA-907.2 unused for an extended period of  
time, we recommend that you turn off the unit by the master power  
switch on the rear panel.  
Warning!  
Troubleshooting & Service  
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.  
Before seeking service for your VA-907.2 subwoofer, please re-  
check all systems. Following is a simple troubleshooting guide to  
assist you.  
Prior to installation  
1. Verify unit is plugged in and power outlet used is active.  
2. Is power switch on?  
3. Is auto turn on/off set properly?  
4. Is unit receiving an input signal from your source?  
5. Have all controls on subwoofer (volume, crossover, phase,  
etc.) been properly set?  
Please unpack the system carefully. Remove all staples used to  
seal the carton as they can scratch the cabinet. 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.  
6. If unit has been running at high levels, one of the protection  
circuits may be engaged.  
Has the built-in amplifier overheated?  
Has the speaker's voice coil started to heat up?  
Product Features & Controls  
Built-in 100 watt (RMS) power amplifier  
Subwoofer Direct - switchable crossover bypass  
Adjustable (40 to 120 Hz) low-pass crossover  
Passive (85 Hz fixed) high-pass crossover  
Line-level inputs & outputs  
If the protection circuitry is active, the unit may cycle on and off until  
operating parameters return to normal. Under more serious condi-  
tions, the unit may shut off completely. Normal operation will return  
upon cooling, but you may be required to turn the power off and then  
on again to reset the unit.  
Speaker-level inputs & outputs  
Signal sensing auto turn on/off with bypass option  
Variable volume control  
Selectable phase control (0 or 180 degrees)  
Anti-clipping circuitry  
Magnetically shielded for video use  
Dual staggered low-pass crossover; 12dB/octave initial,  
24dB/octave ultimate  
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 cabinet or circuitry is physically damaged.  
Gain compression circuit to protect woofer from over excursion  
Thank you for purchasing a Velodyne!  
Input overload protection  
continued. . .  
2
9
 
enced by placement, depending on the acoustic properties of the  
listening room. Typically, the optimum location for a subwoofer is  
tucked away in a 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, and close to the center of your room. Avoid these  
locations when possible. When using a pair of Velodyne subwoof-  
ers in stereo, it is preferable to place each subwoofer by the satellite  
of the same channel.  
Installation  
Your new VA-907.2 subwoofer system 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.  
CAUTION!  
Inputs  
The VA series subwoofers have amplifiers built into the cabinet. Do  
not place the cabinet next to sources of heat such as furnace  
registers, radiators, etc. The power cord should be routed in such a  
way that it will not be walked on, pinched, or compressed in any way.  
Your new VA-907.2 subwoofer is equipped with both speaker-level  
and line-level inputs. Use the LINE-IN jacks when connecting your  
subwoofer to a pre-amp, signal processor, or line-level crossover.  
The FROM AMPLIFIER jacks connect directly to the speaker  
outputs of a integrated amplifier or receiver. Your amplifier section  
will notice no additional loading effects when you use these inputs  
because of their high impedance.  
Regardless of where you install your VA-907.2 subwoofer, it must  
remain in an upright position (passive radiator facing downward).  
Using, shipping, or otherwise storing the VA-907.2 subwoofer in  
any other position for an extended period of time may result in  
damage to the unit not covered by warranty.  
Note  
Do not use both LINE-IN and FROM AMPLIFIER inputs simulta-  
neously.  
The VA-907.2 subwoofer is magnetically shielded to reduce mag-  
netic emission from its cabinet to increase the number of possible  
locations available for placement. However, this shielding may not  
be adequate for all installations. Certain types of televisions are  
particularly sensitive to stray magnetic fields. If your television  
produces distorted colors after installation of your VA-907.2 sub-  
woofer, simply increase the distance between your television and  
the VA-907.2 until normal color and operation is returned.  
Caution!  
Polarity is critical when using speaker level inputs. Reversing the  
polarity of speaker level inputs can damage the unit.  
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 both the main speakers and  
subwoofer.  
Care of your subwoofer  
Low-pass crossover  
Do not use any harsh detergents or chemicals to clean the cabinet.  
Abrasives, detergents, or cleaning solutions may damage the finish  
on the cabinet. We recommend using a damp cloth to clean the  
cabinet.  
Both sets of 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 40 to  
120 Hz. The subwoofer's response will begin rolling off above the  
frequency you set this control to.  
During normal conditions, the VA-907.2 subwoofer may be left on  
continued. . .  
3
8
 
Figure 2: Installation using speaker-level (from amplifier) inputs  
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. With larger speakers, you might start  
with this control set lower, such as 80 Hz.  
POWER  
LOW-PASS  
CROSSOVER  
VOLUME  
CAUTION!  
Serial  
#
Label  
TO SPEAKERS  
RIGHT LEFT  
FROM AMPLIFIER  
LEFT  
MADE IN USA  
~
RIGHT  
LEFT  
RIGHT  
IN  
OUT  
A bypass switch is also provided if you wish to use an external  
crossover. If you are not using an external crossover, we recom-  
mend that you use the one provided within the unit for optimum  
performance.  
Phase adjustment  
MAIN OUTPUTS  
(speaker-level)  
This control allows you the ability to compensate for having the  
subwoofer in a different location than the main speakers. Ideally,  
you will have the sound from the subwoofer reach the listening  
position the same time as the sound from the main speakers.  
However, if the distance from the listening position to the subwoofer  
and the distance from listening position to the main speakers differs,  
the sound from each will reach your ears at a different time.  
INTEGRATED AMP / RECEIVER  
SATELLITE  
SPEAKERS  
Interconnect cables  
This control allows the signal to be delayed 180 degrees so the  
output of the subwoofer will blend in to that of your main speakers  
without any cancellation.  
When installing your VA-907.2 using the line-level inputs/outputs,  
you should use standard shielded phono cables. Always keep the  
lines as short as practical to minimize noise.  
Auto turn on switch  
The auto turn on switch allows the user to bypass the auto turn on  
function if desired. When set in the "auto" mode with main power on,  
the VA-907.2 will turn itself on when an input signal is present. If no  
signal is present, after several minutes the unit will shut itself off.  
When set in the "on" mode, the auto turn on/off function is bypassed  
and the unit will be on whenever the main power switch is on.  
When using the speaker-level inputs/outputs, use the same quality  
speaker cable to your subwoofer as you run to your satellites.  
Power switch  
The master power switch is located on the right half of the unit. This  
rocker style switch is the main on/off for the unit. This switch should  
be set to position 1 for on (up), 0 for off (down).  
Placement  
True subwoofers operate at extremely low frequencies which are  
primarily omnidirectional. While it is recommended that the sub-  
woofer be placed on the same plane as the satellite speakers, room  
and system conditions often dictate otherwise. Keep in mind that  
frequency response and output levels can be drastically influ-  
continued. . .  
7
4
 
mance you should bypass the internal crossover in your Velodyne  
subwoofer, the Subwoofer Direct feature.  
Line-level connection  
Figure 1 shows connection to a pre-amplifier's main outputs and  
returning them to your amplifier inputs.  
To bypass the crossover within the subwoofer, simply locate the  
switch marked "out / in" on the back panel of the subwoofer and set  
to the "out" position. This will eliminate the internal crossover  
function.  
When installed in this fashion, your satellite speakers will be  
crossed over at 85Hz which removes the lower bass from your  
amplifier and speakers, enabling them to do a better job reproduc-  
ing high frequencies. By utilizing this method, you will have a bi-  
amplified system, gaining improved power and headroom for your  
system.  
Note  
If not using an external crossover, you should use the built-in  
crossover for optimal performance.  
Subwoofer out from A/V  
Processor  
A word about subwoofer outputs  
The Velodyne subwoofer is designed to operate using the full range  
audio signal for input when using the built-in crossover. Some  
surround sound processors/receivers, including the Dolby AC3  
system with their .1 channel output, have a "subwoofer out" jack that  
From the low pass output of your signal processor Install into right  
or left RCA line in connector in the back of the subwoofer or use a  
"Y" connector adapter into both right and left RCA line in connectors  
in the back of the subwoofer, and switch the crossover switch to  
"out".  
Figure 1: Installation using line-level (line in) inputs  
POWER  
LOW-PASS  
CROSSOVER  
VOLUME  
Speaker-level connection  
CAUTION!  
Figure 2 shows an easy way to connect your VA-907.2 subwoofer  
directly to your receiver or integrated amplifier.  
Serial  
#
Label  
TO SPEAKERS  
RIGHT LEFT  
FROM AMPLIFIER  
LEFT  
MADE IN USA  
~
RIGHT  
LEFT  
RIGHT  
IN  
OUT  
When connected in this fashion, your satellite speakers will be  
crossed over at 85 Hz, which removes the lower bass from your  
speakers thus, enabling them to do a better job reproducing high  
frequencies.  
PRE-AMP  
AMPLIFIER  
MAIN OUTPUTS  
RIGHT LEFT  
MAIN OUTPUTS  
MAIN INPUTS  
RIGHT LEFT  
RIGHT  
LEFT  
You may also connect your satellites directly to your receiver or  
amplifier along with the subwoofer if you wish to bypass the internal  
high-pass crossover.  
TO SATELLITE SPEAKERS  
Caution!  
To avoid damage to your main amplifier, 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.  
is already crossed over and designed to be used with a conventional  
amplifier and speaker. Combining both an external crossover and  
the one internal to the subwoofer may result in low output and  
increased noise. In these cases, to optimize your subwoofer perfor-  
continued. . .  
5
6
 

Therma Stor Products Group Dehumidifier UA 135H User Manual
Toshiba Camera Accessories IK HR2D User Manual
Toshiba DVD Player SD 4100 User Manual
Toshiba Telephone DK14 User Manual
Triarch Indoor Furnishings 60129 User Manual
Tripp Lite Network Cables N201 014 BK User Manual
Tripp Lite Surge Protector ISOBAR6ULTRA User Manual
Viking Food Warmer F21200 EN User Manual
Vizio Model Vehicle E322AR User Manual
Waterpik Technologies Outdoor Shower CF 200 User Manual