RCA
RCA
RCA splitter cable x 2
Optional Connection - RCA Inputs
PA2 Amplifier
3.5mm to RCA cable
The PA2 is provided with 4 channel line level (RCA) inputs. These inputs can be used
to connect an additional audio source device that can be played either simultaneously
or separately to the high level inputs from the factory head unit.
As an example, the headphone output (3.5mm) from a smartphone can be connected
to the RCA inputs on the PA2 amplifier by using a 3.5mm to RCA cable together with
2 x RCA splitter cables.
*3.5mm to RCA cable and RCA splitter cables are sold separately and are not included.
Appendix A
6
Installation (continued)
4
4.4 Decide a suitable location to mount the PA2 amplifier. The mounting location will
vary depending on the vehicle. Suggested mounting locations include behind the
factory head unit, inside the glove compartment, behind the glove compartment or
under the passenger seat.
i) If installing behind the factory head unit, behind the glove compartment or other
location inside the dash, use the use the supplied foam padding strips by cutting
to size to insulate against possible rattles from metal to metal contact.
ii) If installing inside the glove compartment, use the provided double sided tape
strips to secure the amplifier in place. An opening may need to be cut into the
top/side of the glove compartment to allow the cables to pass through. Before
installing, confirm the glove compartment can be freely opened and
closed with
the amplifier in place, and the cables do not obstruct moving parts.
iii) If installing under the passenger seat, first confirm the cable length will reach the
desired location under the seat. After confirming, attach the supplied carpet
mounting tape to the underside of the PA2 amplifier. The carpet mounting tape
will grip the carpet and hold the amplifier in place.
4.5 Route the PA2 wiring harness to the location of the amplifier and connect both the
16-pin grey connector and 8-pin white connector to the amplifier.
4.6 Confirm all connectors are fully inserted before reinstalling the head unit back into
it’s original position. Test the system by turning on the radio and confim that sound
is output from all speakers. Play music through the sound system and adjust the
gain if necessary (see section 5 below).
4.7 Return panels and trim to the original locations taking care to ensure all connectors
are reconnected to complete the installation.
472-5 Koushin, Fujieda, Nisshin, Aichi, 470-0112, JAPAN
TEL: +81-561-75-1655 FAX: +81-561-74-5595
International
USA and Canada
14778 Beach Blvd. La Mirada, CA 90638
TEL: 1-714-994-1085 FAX: 1-714-249-4741
Beat-Sonic USA Inc.
Gain Adjustment
5
Gain adjustment allows optimization of the factory head unit volume range in relation to
the amount of power output by the PA2 amplifier. In most installations, the gain on the
PA2 amplifier can be left at the factory set 50% gain (approx. 12 o’clock) position. In
some cases however, adjustment may be necessary to prevent overdriving the speakers
at relatively low volumes.
It is important to remember that a lower gain setting does not mean less available power
- it just means that the head unit volume needs to be increased to deliver the same
output volume.
5.1 Adjust factory head unit bass, treble, balance and any other equalizer settings to the
mid point positions.
5.2 Play music with impactful bass, treble and vocals. Slowly increase the volume on the
factory radio to a medium-high level while carefully listening for any distortion.
Use your
finger
nail or small flat head screwdriver to adjust the gain on the front and rear channels
for maximum volume without distortion or overdriving the speakers.
FRONTREAR
GAIN
FR
Turn clockwise
to increase gain
Do not apply excessive force to
gain control. Maximum gain is
at 5 & minimum gain is at 7.
Turn anti-clockwise
to decrease gain
12
39
5 7
8
1
2
4
10
11
6
Troubleshooting
7
How to Adjust the Gain
The gain control will turn easily until the maximum or minimum stop position is reached.
Do not forcibly turn the gain beyond the max / min stop position otherwise damage can occur.
Caution!
12
39
5 7
8
1
2
4
10
11
6
12
39
5 7
8
1
2
4
10
11
6
Factory set gain position
(approx. 12 o’clock)
Minimum gain position
(approx. 7 o’clock)
maxmin
12
39
5 7
8
1
2
4
10
11
6
Maximum gain position
(approx. 5 o’clock)
Ensure vehicle is in ACC mode
or IGN mode.
The ground lead is not securely
connected.
The fuse is blown.
The battery voltage is too low.
No sound
No sound in ACC
mode
The sound is too
quiet
The sound is
distorted
Vehicle must be in ACC or IGN mode.
Ensure ground terminal is securily attached to a metal
point on the vehicle.
Replace the fuse with a new one.
Check battery voltage (11V ~ 15V).
Vehicle uses digital accessories
(ACC) mode.
Certain vehicles, notably Toyota ZN8 GR86 & Subaru
ZD8 BRZ use digital ACC mode. Place vehicle into IGN
mode to turn on the amplifier. This is unique to the
vehicle and is not a defect.
Head unit volume is too low or
fader is biased to front or rear.
The gain setting is not adjusted
correctly.
Adjust volume on radio. Check fader settings are set to
neutral.
Adjust gain settings as explained in section 5 of this
manual.
Head unit volume is too high or
fader is biased to front or rear.
The gain setting is not adjusted
correctly .
Vehicle uses factory 2ch input
amplifier.
Adjust volume on radio. Check fader settings are set to
neutral.
Adjust gain settings as explained in section 5 of this
manual.
Adjusting rear gain
has no effect on
music volume
Keep rear gain at 12 o'clock (default) position. PA2 will
provide maximum power to the factory amplifier using
the front 2 channels.
The amplifier gets
abnormally hot
Speaker impedance is too low.
Inadequate ventilation.
Use speakers with suitable impedance 4 ~ 8Ω.
Make sure amplifier is installed in a well ventilated
location.
Symptom Possible Cause Action
