Roadmaster Block Subwoofer Amplifier VRA1.0 User Manual

Power terminal, Ground terminal, Remote terminal

MIN MAX

OFF ON

20Hz 300Hz

GAIN

FREQ

BASS BOOST

INPUT

LEFT

RIGHT

LINE OUT

4 OHM SUB WOOFER

30 AMP

POWER

PROTECTION

FUSE

MOSFET POWER SUPPLY

POWER REMOTE GROUND

When mounting the amplifier, make sure there is enough room for access to make
adjustments to the switches and adjustment screws.

Mark the holes for the 4 mounting screws in
the 4 mounting brackets with a marker/pen.

Drill 4 pilot holes with electric drill and 1/16" bit.
Make sure there is nothing behind mounting surface
that can be damaged when drilling the holes.

(Safety glasses should be worn at this time.)

Secure amplifier with included screws and
washers using Phillips screwdriver.

DISCONNECT THE VEHICLE’S NEGATIVE (-) BATTERY TERMINAL FROM THE NEGATIVE BATTERY POST.

2. Strip ½" of insulation from the end of the 8 gauge power wire. Connect the 8 gauge power wire to the

after-market positive battery terminal according to the manufacturer's installation instructions.

3. Install a 35 amp fuse or 35 amp circuit breaker in the 8 gauge power wire as close to the battery as practical.
4. Then route the 8 gauge power wire from the 30 amp fuse or circuit breaker to the rear of the amplifier.
5. Strip 1/2" width of insulation from the end of the 8 gauge power wire.
6. Attach a spade lug on the end of 8 Gauge wire.
7. Loosen screw to open POWER connector plates on rear of amplifier.
8. Insert the spade lug between between the connector plates. Turn screw until power cable is tight.

1. Power Terminal

. The ground connection cable should be attached to clean, unpainted chassis metal for a good electrical connection.

2. Find good, non-rusted chassis metal, as close to the amplifier as possible.
3. Drill a pilot hole with a 1/16" drill bit.

4. Use sandpaper to expose an area of bare metal around the pilot hole about the size of a dime.
5. Tightly fasten the provided ground cable with the self tapping sheet metal screw to the chassis metal.

A loose ground will cause distortion and popping noises in the speakers.

3. Ground Terminal

After Market Positive Terminal (

)

In-line 35 amp Fuse or Circuit Breaker

(not included)

Vehicle's Positive (

)

12 Volt power cable

To Amplifier Power Terminal

The REMOTE wire connection automatically turns on your amplifier when your stereo is turned on.

On most stereos, this wire is marked as the REMOTE, ACCESSORY, or POWER ANTENNA.

2. Remote Terminal

1. Locate the REMOTE, ACCESSORY, or POWER ANTENNA on the stereo. (Refer to your stereo owner's manual.)
2. Splice REMOTE, ACCESSORY or POWER ANTENNA wire from rear of the stereo to a length of wire that will

reach the rear of the amplifier

3. Loosen screw and open REMOTE connector plates on rear of amplifier.
4. Insert wire end between the REMOTE connector plates.
5. Tighten screw closing REMOTE connector plates on wire.

Recommended Method For Attaching Wires to Terminals

1. POWER WIRE

2. REMOTE WIRE

3. GROUND WIRE

You may purchase shielded RCA cables that have a remote wire that is built right into the cable.
This type of cable makes it possible to route both RCA cable and remote wire at the same time.

Recommended Method For Splicing Wires

Strip 1/2" of insulation from the ends of the wires..

Twist together and bend as shown.

Wrap with electrical tape.

Read the following wiring instructions very carefully. If you have any trouble understanding
any of these instructions, have the amplifier professionally installed by an experienced
technician. Incorrect wiring will prevent the amplifier from operating, or will damage the
amplifier.

Virtual Reality Sound Labs

SERIOUS SOUND

• 300 Watts Total Peak Power
• 300 Watts Peak into 4 Ohm@ <1.0% THD +/- 5%
• 150 Watts RMS into 4 Ohm @ <1.0% THD +/- 5%
• Measured at 14.4 VDC Input Voltage
• Frequency Response: 20 Hz to 300 Hz +/- 3 db
• THD: Less than 1%
• Dimensions: 2” H X 10.25” W X 9.25” D

• Input Sensitivity: 250 mV to 6 Volts
• Signal to Noise Ratio: Greater than 95 db
• Bass Boost (Mega Bass

): 0 or +6 db

• Adjustable Crossover Freq.: 50 Hz to 250 Hz
• Output Impedance: 4 Ohm Recommended
• Fuse: 30 Amp Automotive Blade Type
• Dimensions: 5.08cm H x 26.04cm W x 23.5cm D

1-800-445-1797

PLEASE DO NOT RETURN PRODUCT TO STORE.

visit us on the WEB

WWW.VR-3.COM

For Information and Technical Assistance,

Call Toll-Free in U.S.A. and Canada.

1. POWER WIRE

When connecting the power wire, place
the spade terminal under the contact plate
and the forks around the screw. Then
tighten the screw.

2. REMOTE WIRE

To connect the remote wire, place the
twisted end under the contact plate and
tighten screw.

3. GROUND WIRE

To connect the supplied ground wire,
remove the screw and contact from the
ground terminal on the rear of the amplifier.
Put the screw through the contact plate,
then through the ground wire, and finally
tighten the screw.

With a hammer and nail set/center punch,
make dimple marks on the mounting
surface for each mounting screw.

Water Damage: Do not install this amplifier in a location that will expose it to water or moisture.
Dust or Dirt: Do not install this amplifier in a location that will expose it to dusty or dirty conditions.
Modifications: Do not open the amplifier for any reason or modify the amplifier in any way. If
modified in any way a fire hazard or malfunction may occur. Modification will void the warranty.

FOR USE WITH 4 to 8 OHM SUBWOOFERS ONLY!

Tools Needed For Installation:

We recommend an Amplifier Installation Kit containing the following parts:

• Power Wire - 8 Gauge w/Terminal Lug
• Remote Wire - 20 Gauge OK

• Speaker Wire - 16 to 12 Gauge
• Input Wires - Shielded RCA cables

• RCA Cables & "Y" Adaptors
• After-Market Battery Terminal

• RCA Cables & "Y" Adaptors

• After-Market Battery Terminal

Allow for air to circulate around the amplifier. Do not mount inverted or upside down. Do not cover with
carpeting or enclose it behind interior panels. Avoid mounting under a seat.

Location

When choosing a location for the amplifier, keep in mind that the amplifier will generate heat. Place the amplifier in
a location that allows air to circulate around it. Amplifier location and installation will vary from vehicle to vehicle,
depending on physical layout of the vehicle. Carefully consider as many installation locations and configurations
as is practically possible DO NOT COVER the amp with carpet or enclose it behind interior panels. DO NOT
mount inverted or upside down. The amplifier may be mounted vertically.

Before permanently installing your VRA1.0 Amplifier, place the VRA1.0 Amplifier in the approximate place it will
occupy in your car. Run all power and speaker wires inside the vehicle toward the amplifier prior to mounting. This
will allow you to estimate how much wire you'll need and where to route the wires inside of your vehicle.

Connect the fused 12 Volt DC power wire, chassis ground cable, and remote wires

. (SEE SECTION 3, ELECTRICAL CONNECTIONS)

Turn on the amplifier, if the Power Protection light is green, turn off the amplifier and proceed to the next section. If
the Power Protection light is red, review all of the connections and wires. You may have a loose connection, a bad
chassis ground, or an inadequate size power wire. If after reviewing all the connections and wires the problem
persists, call our-toll free help line for assistance.

Automotive audio equipment installations can be troublesome at times, even to the most experienced of
installation technicians. If you are not confident working with electrical wiring, removing and reinstalling
interior panels, carpeting, dashboards or other components of your vehicle, please call our toll-free help
line (800)445-1797 and our in-house technical service team will answer your installation questions.

• Nail Set/Center Punch
• Phillips Screwdriver

• Safety Glasses
• Marker/Pen

• Hammer
• Wire Cutter

• Electrical Tape
• Electric Drill with 1/16" bit

Dear Customer,
CONGRATULATIONS. The VRA1.0 Mono Block Subwoofer Amplifier, when used as described, will give you years of
dependable service in your car, truck, RV or mini-van. We have taken numerous measures in quality control to
ensure that your product arrives in top condition, and will perform to your satisfaction. In the rare event that your
VRA1.0 Mono Block Subwoofer Amplifier contains a damaged or missing item, does not perform as specified,
requires warranty service or you have an installation problem.

DO NOT RETURN THIS PRODUCT TO THE STORE.

Please call our TOLL-FREE number US (800-445-1797

) and ask to speak with a member of our technical service

team, or submit your questions by E-Mail to [email protected] and a member of our technical
service team will respond by E-Mail to your questions. Our in-house technical service team will expedite delivery of
your part, advise you on installation, or help troubleshoot a problem with you. If your product needs warranty
service, our technical service team representative will help you obtain the fastest remedy possible under the
warranty.

• 1 Ground Wire

• 12 Wire Nuts

• 30 Amp Fuse

• 1 Self Tapping Screw

• 4 Mounting Screws

• 4 Flat Washers

• Spade Terminal

FRONT OF UNIT

REAR OF UNIT

• Crossover Frequency Adjustment (Freq.)

• Gain Adjustment (GAIN)

• Bass Boost

• 30 Amp Fuse

• “RCA” Outputs To Be
Used With Multiple Amps

• Terminals for

12 Volt DC Power,

Remote Switch,

And Chassis Ground

• Power,

Protection/Connection

Indicator Light

• Terminals for

One 4 OHM Subwoofer

• “RCA” Inputs

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