Line-level connection – Velodyne Acoustics VA-1250X User Manual

Page 8

continued. . .

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
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 up to 180 degrees so the
output of the subwoofer will blend in to that of your main speakers
without any cancellation.

Video/Audio switch
Many listeners prefer an "emphasized" low end on movie
soundtracks. This switch sets the VA-1250X for an additional 3dB
of output when in video mode.

Auto turn on function
With this function in the "auto" position, your subwoofer can be
safely left with the main power switch on continuously. The sub-
woofer will turn itself on automatically when an audio signal is
present. If no signal is present for approximately 15 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 "on" position.

High pass crossover switch
This switch selects the frequency for the high pass crossover. This
crossover is functional on both line and speaker-level outputs.
Smaller speakers with limited low frequency output may prefer the
higher 100Hz setting which will reduce the low frequencies sent to
them. Larger speakers with greater low frequency output may be
able to handle the 80Hz. setting without strain.

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).

Detachable power cord (available on some versions)
Allows for easy replacement should the original be damaged.

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 satellite speakers will be
crossed over at 80/100Hz 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 there .1 channel outputs, have a "subwoofer out" jack
that 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

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Figure 1: Installation using line-level (line in) inputs

MAIN OUTPUTS
RIGHT LEFT

AMPLIFIER

MAIN INPUTS
RIGHT LEFT

MAIN OUTPUTS
RIGHT LEFT

TO SATELLITE SPEAKERS

PRE-AMP

117 V

60 Hz

3 A

POWER

VIDEO/AUDIO

NORMAL/BYPASS

LOWPASS

CROSSOVER

AUTO / ON

MADE IN USA

LEFT

RIGHT

H I G H P A S S 1 0 0

8 0

OUT

POWER

RISK OF ELECTRIC SHOCK

DO NOT OPEN

Velodyne Acoustics, Inc.

San Jose, CA 95112

Serial # Label

AVIS: RISQUE DE CHOC ELECTRIQUE-NE PAS OUVRIR

WARNING: TO REDUCE THE RISK OF

FIRE OR ELECTRIC SHOCK DO NOT EXPOSE

THIS APPLIANCE TO RAIN OR MOISTURE

CAUTION!

SERIES

Audio/Video Subwoofer System

VOLUME

120HZ

100HZ

70HZ

80HZ

90HZ

60HZ

40HZ

LOW-PASS

CROSSOVER

50HZ

110HZ

PHASE

180

120

150

☞