Roadmaster Four Channel Amplifier VRA4.0 Leaflet
Do not splice RCA jacks directly to
the car stereo's speaker wires.
the car stereo's speaker wires.
LINE INPUTS ON
THE FRONT OF AMPLIFIER
LINE INPUTS
LEFT
RIGHT
FRONT
REAR
FRONT CHANNEL
Left & Right Speakers
REAR CHANNEL
Left & Right Speakers
FRONT CHANNEL
REAR CHANNEL
Right Front
Right Rear
Left Rear
Left Front
Shielded RCA Cables
Two Full Range Speakers and a Bridged Sub woofer
Two Bridged Sub Woofers
Four Full Range Speakers
Rear Channel Settings
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.
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.
range of sound to the speakers.
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.
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.
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.
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.
to HPF. See Two Bridged Sub Woofers below
for FREQ. adjustments for HPF crossover.
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.
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.
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.
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).
a pair of full range speakers (FULL), or a pair of satellite tweeters like the RoadmasterUSA RT-15 (LPF).
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)
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.
make the bass sound better, it only adds volume to the lowest frequency.
HPF FULL LPF
CROSSOVER
Front Channel Settings
HPF FULL LPF
CROSSOVER
Rear Channel Settings
HPF FULL LPF
CROSSOVER
Front Channel Settings
HPF FULL LPF
CROSSOVER
HPF FULL LPF
CROSSOVER
Front Channel Settings
or
HPF FULL LPF
CROSSOVER
For tweeter/satellite
(not recommended)
(not recommended)
MIN MAX
GAIN
The GAIN control matches the line output of your car stereo's RCA jacks, to the line inputs
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
across all frequencies. Also make sure the left & right balance and front & rear fader settings are
set in the middle.
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
across all frequencies. Also make sure the left & right balance and front & rear fader settings are
set in the middle.
Gain Control
LINE OUTPUTS
LINE OUTPUTS
Speaker
&
Antenna wires
LINE INPUTS ON
THE FRONT OF AMPLIFIER
LINE INPUTS
LEFT
RIGHT
FRONT
REAR
Left Channel
Right Channel
LINE OUTPUTS
LEFT CHANNEL
RIGHT CHANNEL
Right Front
Right Rear
Left Rear
Left Front
Shielded RCA Cable
RCA "Y" Adaptors
Speaker
&
Antenna wires
You must trim the unused speaker wires on the stereo
and wrap with electrical tape as shown to prevent a short circuit.
and wrap with electrical tape as shown to prevent a short circuit.
FIGURE 1.
2 CHANNELS INTO 4 CHANNELS
FIGURE 2.
4 CHANNELS INTO 4 CHANNELS
High Level to Low Level Input Adaptor
Not Included
RCA "Y" Adaptors
Not Included
Shielded RCA Cable
Not Included
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.
The color of the cables and adaptors that you purchase for installation will vary by manufacturer.
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.
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.
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)
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)
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.
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.
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.
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.
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.
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.
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.
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.
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?
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.
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.
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.
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.
Suspect the power and ground connections, insufficient wire size to carry the current demand,
or improper speaker wiring. Check all wiring connections.
VIRTUAL REALITY SOUND LABS
®
products are designed and manufactured to provide a high level of trouble-free performance. VIRTUAL
REALITY SOUND LABS
®
warrants, to the original purchaser, that its products are free from defects in material and workmanship for 30
days from the date of original purchase. As part of our commitment to product excellence, VIRTUAL REALITY SOUND LABS
®
and/or its
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:
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
®
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and insurance prepaid to the following address: VIRTUAL REALITY SOUND LABS, Service Department, 41 James Way, Eatontown, New
Jersey 07724.
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4. If your product is found by VIRTUAL REALITY SOUND LABS
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liability
shall be limited to that set forth in this warranty. This warranty shall be the exclusive remedy of the purchaser.
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and excluded from this warranty, VIRTUAL REALITY SOUND LABS
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Foreign Intellectual Property Rights Pending. 072108 Printed In China
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0 - +12db
BASS BOOST
(adjustable)
Stereo
Bridge
HPF FULL LPF
CROSSOVER
Front Channel Settings
0 - +12db
BASS BOOST
(adjustable)
Stereo
Bridge
0 - +12db
BASS BOOST
(adjustable)
0 - +12db
BASS BOOST
(adjustable)
0 - +12db
BASS BOOST
(adjustable)
0 - +12db
BASS BOOST
(adjustable)
Stereo
Bridge
Stereo
Bridge
Stereo
Bridge
Set GAIN Higher
When Bridged
Set GAIN Higher
When Bridged
Set GAIN Higher
When Bridged
Stereo
Bridge