Virtual Reality Four Channel Amplifier VRA4.0 Installation Manual page 2

The line inputs on the front of the amplifier receive low level, high impedance signals from the low level RCA
outputs on the car stereo. The amplifier receives the signals and converts them to high level, low impedance
signals to be used to drive the speakers. All of the amplifiers line inputs need to be connected to the to car stereo,
in order to use all of the speaker outputs, or to bridge the outputs. If you plug left and right line inputs into the front
channel, Only the front left and right speaker terminals will have power to output, the other speaker terminals will
not.
FIGURE 1.
2 CHANNELS INTO 4 CHANNELS 4 CHANNELS INTO 4 CHANNELS
Speaker
&
LINE OUTPUTS
LINE OUTPUTS Antenna wires
Right Channel
Left Channel
FRONT CHANNEL
Left & Right Speakers
Shielded RCA Cable
LEFT CHANNEL RIGHT CHANNEL
FRONT CHANNEL
Left Front Right Front
RCA "Y" Adaptors
Left Rear Left Front
Right Rear
Right Front
LINE INPUTS ON
THE FRONT OF AMPLIFIER LINE INPUTS ON
THE FRONT OF AMPLIFIER
LINE INPUTS
LEFT
RIGHT
FRONT REAR
FRONT
Your car stereo may only has 2 line outputs (left & right),
RCA "Y" Adaptors will be needed to split the left and right
signals into 2 right channels and 2 left channels, one of
each channel for both the front and rear inputs.(See Fig.1)
For best sound performance use Shielded RCA Cables to
connect the Line Outputs from your stereo to ALL FOUR
(4) Amplifier Line Inputs. Shielded RCA Cables prevent
electrical inteference from the vehicles electrical system,
and also radio frequency interference.
If your stereo does not have RCA type output jacks, a
high level to low level adaptor will need to be purchased.
The high level to low level adaptor takes the signals from
the car stereo's speaker wires and converts them to low
level, high impedance signals to be used by the amplifier.
Install the converter according to the manufacturers'
High Level to Low Level Input Adaptor
instructions.
Do not splice RCA jacks directly to
the car stereo's speaker wires.
You must trim the unused speaker wires on the stereo
and wrap with electrical tape as shown to prevent a short circuit.
The colors of the jacks on the RCA cables and adaptors shown here are for illustration purposes.
The color of the cables and adaptors that you purchase for installation will vary by manufacturer.
Gain Control
The GAIN control matches the line output of your car stereo's RCA jacks, to the line inputs
GAIN of the amplifier. When you have completed installing the amplifier, turn the gain control to
about 1/2 way(recommended). If you have any distortion at this setting, Play a CD or cassette
on the car stereo, set the bass and treble at 50%, and set the equalizer, if you have one, to flat
MIN MAX
across all frequencies. Also make sure the left & right balance and front & rear fader settings are
set in the middle.
The VRA 4.0 amplifier is capable of driving different speaker configurations by using different combinations of settings.
The 3 Way CROSSOVER permits you to customize the amplifier to power a sub woofer (HPF),
a pair of full range speakers (FULL), or a pair of satellite tweeters like the RoadmasterUSA RT-15 (LPF).
FIGURE 2.
The FREQ control only works when the crossover switch is set to HPF or LPF, when crossover is set to FULL
Speaker
it has no effect at all.(see Speaker Wiring & Options for more settings)
&
Antenna wires
LINE OUTPUTS
The HPF BOOST switch adds a additional 6dB at 50Hz. It normally is set to off. Turning on HPF BOOST, will not
make the bass sound better, it only adds volume to the lowest frequency.
Four Full Range Speakers
REAR CHANNEL
Left & Right Speakers
Shielded RCA Cables Connect 4 full range
speakers to the amplifier, 2 to the
front channel, and 2 to the back channel.
set both the front and rear crossover
switches to FULL.
The FULL setting allows the full
REAR CHANNEL
range of sound to the speakers.
Right Rear
Left Rear
Two Full Range Speakers and a Bridged Sub woofer
LINE INPUTS
Connect 2 full range or satellite
LEFT
speakers to the front channel, and
a sub woofer to the rear channel
RIGHT
of the amplifier. Set the front crossover
REAR
switch to FULL, this allows the full
range of sound to the front speakers.
To set the FREQ. when the crossover is set
to LPF, turn FREQ. all the way to the
left(counter clockwise) this will allow the
RCA "Y" Adaptors
full range of sound to the front speakers.
Not Included
As you turn the FREQ. to the
right(clockwise), you will be cutting off the
low frequencies coming from the front speakers.
Adjust to your liking.
The rear crossover will be set
Shielded RCA Cable
to HPF. See Two Bridged Sub Woofers below
Not Included
for FREQ. adjustments for HPF crossover.
Two Bridged Sub Woofers
Connect 2 sub woofers, one to the
Not Included
front chancel and one to the rear channel.
Set both crossover switches to HPF,
this will allow only the bass sounds
to the sub woofer.
To set the FREQ. when the crossover is
set to HPF, turn FREQ. all the way to
the right, this will allow the full range
of sound to the sub woofer.
As you turn the FREQ. to the
left(counter clockwise), you
will be cutting the high frequencies
coming from the speaker.
Adjust to your liking.
What is the per channel RMS power of this amplifier?
50 Watts RMS per channel times two channels. Consult the specifications in the installation manual.
What is a 3 Way Electronic Crossover?
A 3 Way Electronic Crossover divides the audio signal into two parts, this permits you to customize the amplifier
to power a subwoofer (LPF), or a pair of satellite tweeters like the RoadmasterUSA RT-15 (HPF).
When the switch is set to (FULL) the full audio signal will power a pair of full range speakers.
Why do I hear a clicking sound?
Digital amplifiers make a clicking sound when driven into distortion. Turn down the Gain control.
Can I wire a bridged subwoofer ("Bridge" two channels)?
Yes you can connect a subwoofer by bridging the two channels, see Speaker Wiring and Options.
What if my car radio doesn't have RCA line outputs?
Stereo Bridge
You will need a converter used to change the signals from the speaker wires to RCA line level inputs. Follow
the converter manufacturer's installation instructions.
Front Channel Settings
What should I do if my car radio doesn't have a remote wire?
Connect the amplifier remote terminal to a switched 12 volt circuit controlled by the ignition switch. This will turn
HPF FULL LPF
0 - +12db
the amplifier off when the ignition switch is turned off.
CROSSOVER
BASS BOOST
(adjustable)
Do I need a stiffening capacitor with this amplifier?
It never hurts to have extra reserve power when operating an amplifier of this caliber.
Why does the Protect LED stay red?
Stereo Bridge
Suspect the power and ground connections, insufficient wire size to carry the current demand,
or improper speaker wiring. Check all wiring connections.
Front Channel Settings
HPF FULL LPF
0 - +12db
CROSSOVER
BASS BOOST
(adjustable)
Stereo Bridge
Front Channel Settings
HPF FULL LPF
0 - +12db
CROSSOVER
BASS BOOST
or
(adjustable)
HPF FULL LPF
CROSSOVER
For tweeter/satellite
(not recommended)
Stereo Bridge
Rear Channel Settings
VIRTUAL REALITY SOUND LABS
HPF FULL LPF 0 - +12db
REALITY SOUND LABS
CROSSOVER BASS BOOST
days from the date of original purchase. As part of our commitment to product excellence, VIRTUAL REALITY SOUND LABS
(adjustable)
affiliates routinely improve the designs, materials or production methods of its existing products. Because it is impractical to publicize all
changes in every product, we reserve the right to make such changes without notice.
CONDITIONS OF WARRANTY:
Set GAIN Higher
If during the 30 day warranty period your new product is found to be defective, VIRTUAL REALITY SOUND LABS
When Bridged
or replace the product, without charge for parts or labor subject to the following conditions:
1. All repairs must be performed by VIRTUAL REALITY SOUND LABS
2. The equipment must not have been altered or been damaged through negligence, accident, or improper operation.
3. The replacement of parts are exempted from this warranty when replacement is necessary due to normal wear and tear.
Stereo Bridge
4. All warranty claims must be accompanied by a copy of the sales receipt or bill of sale.
5. Repair or replacement parts supplied by VIRTUAL REALITY SOUND LABS
Front Channel Settings
portion of the original warranty.
6. In the case of car stereos, this warranty does not extend to the elimination of car static or motor noise; correction of antenna problems;
costs incurred for the removal or reinstallation of the product; damage to tapes, speakers, accessories or car electrical systems.
7. VIRTUAL REALITY SOUND LABS
HPF FULL LPF 0 - +12db
OWNER'S RESPONSIBILITIES:
CROSSOVER BASS BOOST VIRTUAL REALITY SOUND LABS
(adjustable) SHOULD YOU HAVE ANY QUESTIONS ABOUT SERVICE RECEIVED, OR IF YOU WOULD LIKE ASSISTANCE IN OBTAINING SERVICE,
PLEASE CALL TOLL FREE 1-800-445-1797, 8:30am - 4:30pm EST.
In order to provide you with the proper warranty service, we request that you adhere to the following procedure:
1. Include a copy of your sales receipt or bill of sale with your unit when it is returned for warranty service.
2. If it is necessary to return your product for service, please return it securely packed, preferably in the original shipping carton, and freight
and insurance prepaid to the following address: VIRTUAL REALITY SOUND LABS, Service Department, 41 James Way, Eatontown, New
Set GAIN Higher Jersey 07724.
3. Please include a detailed explanation of the problem you are having.
When Bridged
4. If your product is found by VIRTUAL REALITY SOUND LABS
will be repaired or replaced at no charge and returned to you prepaid. Where permitted by Iaw VIRTUAL REALITY SOUND LABS
shall be limited to that set forth in this warranty. This warranty shall be the exclusive remedy of the purchaser.
VIRTUAL REALITY SOUND LABS
Stereo Bridge
disclaimed by VIRTUAL REALITY SOUND LABS
the manufacturer, distributor and seller shall not be liable for any injury, loss or damage, incidental or consequential, arising out of the use
Rear Channel Settings
or intended use of the product.
HPF FULL LPF 0 - +12db
CROSSOVER BASS BOOST
(adjustable)
Set GAIN Higher
When Bridged ©2004 Virtual Reality Sound Labs. All rights reserved. All designs, logos and images are the exclusive property of Virtual Reality Sound Labs. US and
GIVE US A CALL, WE'LL HELP YOU INSTALL.
PLEASE DO NOT RETURN PRODUCT TO STORE.
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www.vr-3.com
For Information and Technical Assistance,
Call Toll-Free in U.S.A. and Canada.
1-800-445-1797
® products are designed and manufactured to provide a high level of trouble-free performance. VIRTUAL
®
warrants, to the original purchaser, that its products are free from defects in material and workmanship for 30
® will repair such defect,
® and/or its affiliates in Eatontown, New Jersey.
® under this warranty are protected only for the unexpired
® will not be responsible for any charge incurred for installation.
® will make every effort to provide warranty service within a reasonable period of time.
® to have a defect in material or workmanship, within the warranty period, it
® makes no other warranty of any kind, expressed or implied; and all implied warranties, are hereby
® ®
and excluded from this warranty, VIRTUAL REALITY SOUND LABS and/or its affiliates,
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