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
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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
The FREQ control only works when the crossover switch is set to HPF or LPF, when crossover is set to FULL it has no effect at all.(see Speaker Wiring & Options for more settings)
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.
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
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.
Left Channel | Right Channel |
FRONT CHANNEL | REAR CHANNEL |
Left & Right Speakers | Left & Right Speakers |
Shielded RCA Cable
Shielded RCA Cables
LEFT CHANNEL | RIGHT CHANNEL | FRONT CHANNEL | REAR CHANNEL | |
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Left Front |
| Right Front |
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RCA "Y" Adaptors |
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Left Rear | Right Rear |
| Left Front | Right Rear |
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LINE INPUTS ON |
| Right Front | Left Rear | |
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THE FRONT OF AMPLIFIER |
| LINE INPUTS ON | ||
Four Full Range Speakers
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 range of sound to the speakers.
Stereo | Bridge |
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 |
| (adjustable) |
What if my car radio doesn't have RCA line outputs?
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.
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 the amplifier off when the ignition switch is turned off.
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?
Suspect the power and ground connections, insufficient wire size to carry the current demand, or improper speaker wiring. Check all wiring connections.
THE FRONT OF AMPLIFIER |
LINE INPUTS |
Two Full Range Speakers and a Bridged Sub woofer
| LINE INPUTS | |
| LEFT |
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| RIGHT |
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FRONT | REAR | RIGHT |
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Connect 2 full range or satellite speakers to the front channel, and
a sub woofer to the rear channel 
of the amplifier. Set the front crossover 
switch to FULL, this allows the full range of sound to the front speakers.
Stereo | Bridge |
Front Channel Settings | |
HPF FULL LPF | 0 - +12db |
CROSSOVER | BASS BOOST |
or | (adjustable) |
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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' instructions.
You must trim the unused speaker wires on the stereo
and wrap with electrical tape as shown to prevent a short circuit.
RCA "Y" Adaptors 
Not Included
Shielded RCA Cable
Not Included
High Level to Low Level Input Adaptor
Not Included
Do not splice RCA jacks directly to the car stereo's speaker wires.
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 full range of sound to the front speakers. 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
to HPF. See Two Bridged Sub Woofers below for FREQ. adjustments for HPF crossover.
Two Bridged Sub Woofers
Connect 2 sub woofers, one to the
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
HPF FULL LPF
CROSSOVER
For tweeter/satellite (not recommended)
Stereo Bridge
Rear Channel Settings
HPF FULL LPF | 0 - +12db |
CROSSOVER | BASS BOOST |
| (adjustable) |
Set GAIN Higher
When Bridged
Stereo Bridge
Front Channel Settings
HPF FULL LPF | 0 - +12db |
CROSSOVER | BASS BOOST |
| (adjustable) |
Set GAIN Higher
When Bridged
For Information and Technical Assistance,
Call
VIRTUAL REALITY SOUND LABS® products are designed and manufactured to provide a high level of
CONDITIONS OF WARRANTY:
If during the 30 day warranty period your new product is found to be defective, VIRTUAL REALITY SOUND LABS® will repair such defect, 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® and/or its affiliates in Eatontown, New Jersey.
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.
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® under this warranty are protected only for the unexpired 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® will not be responsible for any charge incurred for installation.
OWNER’S RESPONSIBILITIES:
VIRTUAL REALITY SOUND LABS® will make every effort to provide warranty service within a reasonable period of time.
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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 | |
Jersey 07724. | |
3. | Please include a detailed explanation of the problem you are having. |
4. If your product is found by VIRTUAL REALITY SOUND LABS® to have a defect in material or workmanship, within the warranty period, it | |
will be repaired or replaced at no charge and returned to you prepaid. Where permitted by Iaw VIRTUAL REALITY SOUND LABS® liability | |
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 |
MIN MAX | on the car stereo, set the bass and treble at 50%, and set the equalizer, if you have one, to flat |
| across all frequencies. Also make sure the left & right balance and front & rear fader settings are |
| set in the middle. |
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.
Stereo Bridge
Rear Channel Settings
HPF FULL LPF | 0 - +12db |
CROSSOVER | BASS BOOST |
| (adjustable) |
Set GAIN Higher
When Bridged
shall be limited to that set forth in this warranty. This warranty shall be the exclusive remedy of the purchaser. |
VIRTUAL REALITY SOUND LABS® makes no other warranty of any kind, expressed or implied; and all implied warranties, are hereby disclaimed by VIRTUAL REALITY SOUND LABS® and excluded from this warranty, VIRTUAL REALITY SOUND LABS® and/or its affiliates, the manufacturer, distributor and seller shall not be liable for any injury, loss or damage, incidental or consequential, arising out of the use or intended use of the product.
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