Roadmaster VRA1.0 用户手册

Left Channel

Right Channel

LEFT CHANNEL

RIGHT CHANNEL

Shielded RCA Cable

Speaker

&

Antenna wires

FIGURE 1.

Generic Car Stereo

OFF   ON

BASS BOOST

(optional)

The line inputs on the front of the amplifier receive low level, high impedance signals from the low level RCA 
outputs of 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 car stereo, 
in order to use all of the speaker outputs.

The line inputs on the front of the amplifier receive low level, high impedance signals from the low level RCA 
outputs of 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 car stereo, 
in order to use all of the speaker outputs.

VIRTUAL REALITY SOUND LABS

TM

 products are designed and manufactured to provide a high level of trouble-free performance. VIRTUAL REALITY SOUND 

LABS

TM

 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

TM

  and/or  it’s  affiliates  routinely  improves  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.

If during the 30 day warranty period your new product is found to be defective,  VIRTUAL REALITY SOUND LABS

TM

 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

TM

 and/or it’s 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

TM

 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

TM

 will not be responsible for any charge incurred for installation.

VIRTUAL REALITY SOUND LABS

TM

 will make every effort to provide warranty service within a reasonable period of time. 

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.

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: 

TM

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

TM

 liability shall be limited to that set forth in this 

warranty. This warranty shall be the exclusive remedy of the purchaser.

VIRTUAL  REALITY  SOUND  LABS

TM

  makes  no  other  warranty  of  any  kind,  expressed  or  implied;  and  all  implied  warranties,  are  hereby  disclaimed  by 

VIRTUAL REALITY SOUND LABS

TM

 and excluded from this warranty, VIRTUAL REALITY SOUND LABS

TM

and/or it’s 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.

The  pre-amp  line  outputs  allow 
unamplified  signals  to  pass 
through  the  amplifier  to  be  used 
in  a  multiple  amplifier  stereo 
system.

Do not splice RCA jacks directly to 
the car stereo's speaker wires.

Not Included

Not Included

Not Included

For best sound performance use Shielded RCA Cables 
to  connect  the  Line  Outputs  from  your  stereo  to  the  
Amplifier  Line  Inputs.  Shielded  RCA  Cables  prevent 
electrical  interference  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)

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.

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.  

You  must  trim  the  unused  speaker  wires  on  the  stereo  and 
wrap with electrical tape as shown to prevent a short circuit.

To  wire  a  4  ohm  single  voice  coil  subwoofer  to 
the amplifier, connect the amplifier’s positive (

+

)

terminal to the subwoofer’s positive (

+

) terminal. 

Then  connect  the  amplifier’s  negative  (-) 
terminal to the subwoofer’s negative (-) terminal.

To wire a dual voice coil subwoofer connect the 
amplifier’s positive (

+

) terminal to the positive (+) 

terminal of voice coil “A”. 
Next connect the negative terminal of voice coil 
“A”  to  the  postive  (

+

)  terminal  of  voice  coil  “B”. 

Then  connect  the  negative  (-)  terminal  of  the 
amplifier  to  the  negative  (-)  terminal  voice  coil 
“B”.

To wire two single voice coil 4 ohm subwoofers in series 
connect  the  amplifier’s  positive  (+)  terminal  to  the 
positive (+) terminal of subwoofer “A”. 
Next connect the negative (-) terminal of subwoofer “A” 
to the positive (+) terminal of subwoofer “B”. 
Then  connect  the  negative  (-)  terminal  of  the  amplifier 
to the negative terminal of subwoofer “B”.

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,

the gain control must be set at 

no more than half way to prevent damage to the amplifier

.

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 set the left & right balance and front & rear fader settings are set in the 
middle. If you have any distortion at these setting, then turn the gain down until the distortion 
disappears.

50Hz  250Hz

FREQ

The  frequency  adjustment  screw  (FREQ.)  only  has  an  effect  if  the  crossover  switch  is  set  to 
"BASS" or "TREBLE", when the crossover is set to FLAT it has no effect. 
To set the FREQ. turn FREQ. all the way to the right, this allows a range of sound from 50 Hz  - 
250  Hz  to  the  subwoofer.  As  you  turn  the  FREQ.  to  the  left  (counterclockwise),  you  will  be 
cutting off the high frequencies coming from the subwoofer. 

The BASS BOOST switch adds an additional 6dB at 50Hz. It normally is set to OFF. Turning 
ON  BASS  BOOST,  will  not  make  the  bass  sound  better,  it  only  adds  volume  to  the  lowest 
frequency. Bass Boost should not be turned on if you have Bass Control or Loudness on your 
stereo head unit. 

4 Ohms + 4 Ohms = 8 Ohms

What is the per channel RMS power of this amplifier?
150 Watts RMS into 4 Ohm @ <1.0% THD +/- 5%

Can I hook up two subwoofers to this amplifier?
Only if both subwoofers are wired in series.

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. 
The VRPC1000 Power Capacitor is the perfect companion to the VRA2.0 Amplifier.

Why does the Power / Protect LED switch between green & red?
Check your POWER and GROUND connections.  Also check to see that your wire size is sufficient to 
carry the current demand.  Check for improper impedance loads

Why does the Power / Protect LED stay red?
This typically indicates that one or more of the MOSFET output transistors has shorted. 
This condition will not fix itself. The amplifier must be returned to Virtual Reality Sound Labs for repair.

Why don’t I have any sound when the protection light is green?
Check the controls on the stereo, make sure that the volume, balance, and fader controls are set properly. 
Also check or replace the RCA cables. They may be defective.

4 OHM SUBWOOFER

4 OHM SUBWOOFER

©2005 Virtual Reality Sound Labs

TM

.  All designs, logos and images are the exclusive property of Virtual Reality Sound Labs

TM

and/or its affiliates.  Design Patent Pending.  All rights reserved. 050505 Printed in China 00000