Velodyne SA-7 User manual

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Velodyne
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VElODYNE ACOUSTICS, INC. 1746JUNCTIONAVE,SANJOSE,CA95112
408-436-0688 • BOO-VELOOYNE (800-835-6396) 1:1 TLX: 3716957 "VELO" III F,A,X 408-436-0311
For your records:
Serial Number
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Date of Purchase
Name of Store
OWner's Manual
Velod~1e SA-7 Subwoofer System
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Congratulations on your purchase of a Velodyne SA-7
Subwoofer Syst.em. This unit represents the state of the art, in
accurate bass reproduction. Read and follow the instructions
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.
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.
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 (located to the left of the power switch on the
rear control panel) in the space provided above for future
reference.
Installation:
There are three installation options for the SA·-7. A single SA-7
may be wired directly bE!tween an amp or receiver and the main
speakers. A single SA-7 may be installed using the line level
subwoofer output found on many surround/signal processors.
Finally ,one SA·-7 may be! wired in each channel between the amp
and the main speakers for stereo bass.
Please observe the rear control panel and proceed with the
installation of your choice:
1) ~ingle SA-'7 direct from Amplifier. or Receiver:
Run a length of speaker cable from the RIGHT CHANNEL speaker
output of your amplifier/receiver to the terminals of the SA-7
control panel labeled AMP IN/RIGHT. Run a second length of cable
from the. SA-7 terminals labeled SPEAKER OU'lI/RIGHT to the
terminals on t,he back of RIGHT SATELLITE SPEAKER.
Repeat the above procedure for LEFT CHANNEL. Observe caution
not~ce below. \'ili th the above connection completed proceed t:o
placement section below.

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2) single SA-7 direct from mono output of a signal processor:
Many signal processors and surround sound decoders have monaural
subwoofer outputs with built in crossovers. To install your SA-7
in such a system, run a single phono cable from the subwoofer
output to the jack labeled LINE IN. This confiquration bypasses
the SA-7's adjustable crossover network. Do not use speaker
level inputs or outputs in conjunction with LINE IN.
vJith the above connection completed, proceed to placement section
below.
3) stereo SA-7s:
Run a length of speaker cable from the RIGHT CHANNEL speaker
output of your amplifier/receiver to the terminals on the SA-7
control panel labeled AMP IN/RIGHT.
Run a second length of cable from the SA-7 terminals labeled
SPEAKER QUT/R[GHT to the terminals on the back of the RIGHT
satellite speaker.
Repeat the above procedure on the second SA-7 using the LEF~r
CHANNEL inputs and outputs. (When using stereo pairs of
SA-7s you will use only 2 pair of terminals on each subwoofer,
leaving 2 pair unused) .
caution: To avoid damage to your main amplifier
be sure 'to make all speaker connections from RED
(positive) to RED and from BLACK (negative) to
BLACK. Be sure that all connections are tight,
and that there arE~ no loose strands or frayed wires.
Placement:
The SA-7 operates primarily at frequencies below 85Hz. For most
listeners these low pitches are essentially non-directional.
This means that you may place the subwoofer almost anywhere,
without degrading the stereo imaging characteristics of your main
speaJeers.
When using a pair of SA-7s in stereo, it is preferable to place
each subwoofer adjacent to the satellite on the same channel.
Placing a pair of bookshelf speakers directly on top of a pair of
SA-7s yields an unparalleled full range biamped loudspeaker
syst~'?m.
Keep in mind that frequency response and output level can be
greatly influenced by placement, depending on the acoustic
properties of the listening room. Typically the SA-7 will sound
louder next to a wall or in a corner.
caution: The SA-7 amplifier is built into the
woofer cabinet. Do not place cabinet next to

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sources of heat such as furnace registers, etc.
The power cord shcmld be routed in such a way
that it will not be walked on, pinched, or com-
pressed.
Due to the strengt~ to the magnet in the~ SA-7
driver, it is recmnmended that t.he unit be
placed at least 2 1/2 feet from any television
or other magnet sEmsitive device such as a
computer disk drive.
Control Functions:
The control panel on the back of the SA-7 includes a power
switch, a level control, and a microadjustable low pass cross-
over selector. Once the system is installed as described above,
the unit may be plugged in and switched on.
The subwoofer level control is used to adjust the amount of bass
information in relation 1:0 the midrange and tre~ble frequencies.
We recommend that you begin listening with the level set at. the
point midway between MAX and MIN. Play several selections of
music and vary the subwoofer level until the bass matches t.he
mids and highs to your satisfaction. Once you set the subvwofer
level, you simply use thE: volume control on your preamp or
receiver and the bass proportion will remain consistent.
The LOW PASS crossover selector controls the upper limit of' the
SA-7 I S frequency respons,~. For example, with t:he selector set at
60HZ, the subwoofer begins rolling off above this frequency.
Using the selector you may match the Velodyne precisely to your
main speakers. If you are using very small bookshelf speakers
you may wish to raise the low pass as high as 100Hz. If you own
large full range loudspeakers, you may find a lower setting more
appropriate.
By fine tuning the level and crossover controls, you can create a
seamless blend between the SA-7 and your main speakers, with bass
response and output tailored to your listening room and personal
preference.
~are of your SA-7:
The SA-7 is designed to provide years of trouble free service.
We recommend using a clean damp cloth for cleaning the cabinet.
Never use detergents or abrasive on your SA-7.
Please unplug the unit if you do not intend to use it for a
prolonged period of time.
?rot~ction Circuitry:
Your SA-7 is equipped with several electrical circuits designed

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to protect the unit from damage. Any of the following conditions
will power t:he unit down and it will remain off for 5 seconds
after the fault is corrected.
1. If the amplifier chassis reaches a temperature in ,excess
of 140 degrees Fahrenheit.
2. If there is a significant drop in the line voltage.
3. If there is an input signal which momentarily exceeds
the dynamic range of the unit.
Troubleshooting:
If your unit shuts itsel1: down, please consider the protect:ion
circuits described above. You may only need to turn the volume
down a bit. Remember that the amplifier is built into the
subwoofer box and adequate ventilation must be maintained.
Overheating will shut the unit off.
For other problems refer to the service section below.
service:
For service please contact your local Velodyne dealer. The
following conditions always require service by qualified
personnel:
1. If the power cord is damaged.
2. If the unit does not appear to operate normally or
exhibits a marked change in performance.
3. If the unit has been exposed to the possibility of water
damage.
Velodyne Acoustics, Inc.
'r'1-4"'6-'.:Juneti-orr-AvenUe
Sa~'Jose-,-eA 95112
40-8-4:3 6"""0688
Velodyne and SA-7 are registered trademarks of Velodyne
Acoustics, Inc.

VELODYNE SA-7 SUBWOOFER SYSTEM SPECIFICATIONS
Amplifier
Type: Integrated Class B.
Power: 100 watts continuous RMS, 400 watts peak.
Monaural line level input sensitivity/impedence: 700mv/12K ohms.
Diameter:
Linear TravE:l:
12 inches.
9/16"
Driver
Voice Coil:
Magnet:
Copper; 2 3/8"
560z.
Con(~:
Resin impregnated fiber.
Crossovers
High Pass:
Low Pass:
Passive/85Hz nominal. 6db per octave.
Active/Microadjustable from 60Hz to 100Hz. 12db per
octave.
High Gain Servo
The SA-7 utilizes the same full H.G.S. error correction
circuitry as the Velodyne ULD-18, ULD-15, and ULD-12. At t:he
heart of this technology is a small transducer called an
accelerometer. This device, a hybrid of piezoelectric and
integrated circuit technologies, is hand built by Velodyne to
meet rigid requirements for low mass, dynamic range, frequency
response, and signal-to-noise ratio.
The accelerometer generates a precise analog of the
speaker's acoustical output. This signal is directed to a
soph.isticatE~d comparator circuit that immediately detects any
differences between the "feedback" signal and the pure input from
the preamplifier. At the onset of nonlinearity, the amplified
signal to the woofer is corrected.
Servo Loop Gain:
Servo Loop Feedback Rate:
Maximum Distortion
(25Hz @ 104db):
Frequency Response:
Driver Resonant Frequency:
Air Volume Displacement:
Damp ing Fac1:or:
Protection:
Cabinet:
Wa.rranty:
26db.
3500 corrections per second.
<2%
25Hz low, 60Hz - 100Hz high
(depending on crossover setting).
<4Hz
45 c.L
>1000
Chassis Thermal; Low Voltage;
Excessive signal.
Forward Firing (H) 33 1/2", (W) 13
3/4", (D) 12 5/8", 60 lb Black vinyl.
2 years.