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PHASE
The Phase is a variable control used to adjust the phase of
the output signal relative to the phase of the input signal.
This "phase alignment" is most noticeable when used with
an array of woofers whose vertical or horizontal planes are
staggered (not emanating from the same point.) Adjusting
the Phase can electrically realign the signal fed to each
woofer as if all woofers were aligned on a common ZDP
(Zero Delay Plane). In SPL (Sound Pressure Level) systems, a
desired ZDP is the point source where all speaker's voice
coils are aligned on the same imaginary plane, thus
allowing the signals to arrive at the microphone at the
same time.
The phase is most noticeable when the system is playing a
sine wave (test tone), not music. When used with the
proper test equipment, this feature can increase the
relative SPL in a system.
If the Phase is not used (like with a competitive SPL vehicle,) each amplifier's Phase should be set to (0)
or (No Delay).
Amplifier Does Not Turn On
Possible Cause
The in-line fuse on battery positive
cable is blown.
Poor ground connection
Poor power connection or power
outside acceptable range.
No Sound Coming From Amplifier
Possible Cause
Poor RCA connections.
Poor speaker connections
Bad source unit
Speaker "Pop" When Amplifier Turns On
Possible Cause
Remote from source unit comes on too
quickly.
Poor remote power signal from source
Solution
Check in-line fuse on battery positive cable. Replace if necessary.
Verify that Ground connection is connected to clean metal on the
vehicle's chassis. Repair/replace if necessary.
Verify there is 10.5 - 15.5 Volts present at the positive battery and
remote turn-on cable. Verify quality connections for both cables at
amplifier, stereo, and battery/fuseholder. Repair/replace if necessary.
Solution
Verify good RCA input connections at source and amplifier. Check
entire length of cables for kinks, splices, etc. Test RCA inputs for
AC voltage with the source unit on. Repair/replace if necessary
Use an ohm meter to check speaker wire integrity. Check entire
length of wires for kinks, splices, etc. Repair/replace if necessary.
Connect RCA input from test source directly to amplifier input. If
this solves the problem, have the source unit repaired or replaced.
If not, have the amplifier checked by a qualified technician.
Solution
Disconnect input signal to amplifier and turn amplifier on and off.
If the noise is eliminated, connect the REM lead of amplifier to
source unit with a delay turn-on module
Use a different 12 Volt source for REM lead of amplifier (i.e.
battery direct). If the noise is eliminated, use a relay to isolate the
amplifier from noisy turn-on output.
O
PERATION
T
ROUBLESHOOTING
11
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