Velodyne Acoustics VA-907.2 User's Manual
Contents
1. 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 If you want the absolute deepest most feel it in your tushy BASS under a grand look no farther than the Velodyne 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 Web Site htto www velodyne com E mail velodyne earthlink net Printed on recycled paper M 907 2 Owner s Manual Velodyne Audio Video Subwoofer System CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN Caution To reduce the risk of electric shock do not remove back panel No user serviceable parts inside Refer servicing to qualified service personnel The lighting 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 of electric 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 Ji Roo DOS 10 11 12 13 14 15 16 Read Instructions All safety and operating instructions should be read before the subwoofer is operated Retain Instructions The s2. will notice no additional loading effects when you use these inputs because of their high impedance Note Do not use both LINE IN and FROM AMPLIFIER inputs simulta neously Caution Polarity is critical when using speaker level inputs Reversing the polarity of soeaker level inouts 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 Low pass crossover 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 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 sam
3. 4 5 x14 5 x14 5 H W D 35 120 Hz 3 dB Passive 85 Hz 6dB octave slope 40 120 Hz active adjustable 100 watts 250 watts peak Class A B 8 forward firing 10 downward firing 55 OZ 2 diameter Line and speaker level Two years parts amp labor 45 lbs approx Specifications are subject to change without notice FOR YOUR RECORDS DATE PURCHASED DEALER SERIAL NOTE Please complete and return your warranty card within ten 10 days 10 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 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 Troubleshooting amp Service Before seeking service for your VA 907 2 subwoofer please re check all systems Following is a simple troubleshooting guide to assist yOu Verify unit is plugged in and power outlet used is active Is power switch on Is auto turn on off set properly Is unit receiving an input signal from your source Have all controls on subwoofer volume crossover phase etc been properly set If unit has been running at high levels one of the protection circuits may be engaged Has the built in amplifier overheated Ha
4. afety and operating instructions should be retained for future reference Heed Warnings All warnings on the subwoofer and in the operating instructions should be adhered to Follow Instructions All operating and use instructions should be followed Water and Moisture The subwoofer 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 Wall or Ceiling Mounting The subwoofer should be mounted to a wall or ceiling only as recommended by the manufacturer Ventilation The subwoofer should be situated so that its location or position does not interfere with its proper ventilation For example the subwoofer 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 Heat The subwoofer should be situated away from heat sources such as radiators heat registers stoves or other subwoofers that produce heat Power Sources The subwoofer should be connected to a power supply only of the type described in the operating instructions or as marked on the subwoofer 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 re
5. ceptacles and the point at which they exit from the subwoofer Caution To prevent electrical shock match wide blade of plug to wide slot fully inserted Attention Pour eviter les chocs electriques introduire lame la plus large de la fiche dans la borne correspondante de la prise et pousser jusqu au fond Cleaning The subwoofer should be cleaned only as recommended by the manufacturer Nonuse Periods The power cord of the subwoofer should be unplugged from the outlet when left unused for a long period of time Object and Liquid Entry Care should be taken so that objects do not fall and liquids are not spilled onto the enclosure Damage Requiring Service The subwoofer should be serviced by qualified service personnel when The power supply cord or plug has been damaged Objects have fallen or liquid has been spilled into the subwoofer The subwoofer has been exposed to rain The subwoofer does not appear to operate normally or exhibits a marked change in performance The subwoofer has been dropped or damaged Servicing The user should not attempt to service the subwoofer beyond what is described in the operating instructions oaoo All other servicing should be referred to qualified service personnel SPECIFICATIONS Cabinet including legs Frequency Response High Pass Crossover Low Pass Crossover Amplifier Woofer Passive Radiator Magnet Voice Coil Inputs Outputs Warranty Weight VA 907 2 1
6. e channel CAUTION 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 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 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 Care of your subwoofer 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 During normal conditions the VA 907 2 subwoofer may be left on continued 8 IS Figure 2 Installation usin
7. e 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 amp 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 amp outputs Speaker level inputs amp 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 Gain compression circuit to protect woofer from over excursion Input overload protection continued 9 IS 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 Inputs 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
8. g speaker level from amplifier inputs Velodyne AGA MAIN OUTPUTS speaker level INTEGRATED AMP RECEIVER Oe Oe Interconnect cables 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 When using the speaker level inouts outputs use the same quality speaker cable to your subwoofer as you run to your satellites 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 soeakers room and system conditions often dictate otherwise Keep in mind that frequency response and output levels can be drastically influ 7 Ts 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 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 ad
9. ite 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 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 Figure 1 Installation using line level line in inputs PRE AMP AMPLIFIER MAIN OUTPUTS MAIN INPUTS MAIN OUTPUTS RIGHT LEFT RIGHT LEFT RIGHT LEFT TO SATELLITE SPEAKERS 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 5 IS mance you should bypass the internal crossover in your Velodyne subwoofer the Subwoofer Direct feature 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 Note If not using an external crossover you should use the b
10. justment 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 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 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 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 O for off down continued 4 IE Line level connection Figure 1 shows connection to a pre amplifier s main outputs and returning them to your amplifier inputs When installed in this fashion your satell
11. s the speaker s voice coil started to heat up AE el A E lf 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 The following conditions require service by a qualified technician 1 The power cord has become damaged 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 Thank you for purchasing a Velodyne 9 is 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 Warning 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 cabinet Pleas
12. uilt in crossover for optimal performance Subwoofer out from A V Processor 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 Speaker level connection Figure 2 shows an easy way to connect your VA 907 2 subwoofer directly to your receiver or integrated amplifier 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 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 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 continued 6 Ts
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