TROUBLESHOOTING
Am I In Phase?
If your inputs are out of phase and you turn the balance
control of your radio all the way to one side, right or left, the
bass output from the Bazooka
®
will increase. When you bring
the balance control back to the center position the bass level
will drop. This confirms that one of your input channels is
wired out of phase with the other.
When one of the Amplified Bazooka's High-level Input channels
is out of phase electrically with the other High-level Input
channel, your Bazooka will sound as if it has little or no output
and any output that is produced may sound distorted. If you
suspect that your Bazooka is out of phase, use the AM I IN
PHASE procedure to diagnose and correct the Bazookas' output,
and proper bass response will be produced. channels is wired
out of phase with the other. To correct this situation, simply
flip the phase switch on the amplified Bazooka
®
. When the
input signal is in correct electrical phase, the level of bass
output will be greatest when the balance control of the radio
is set to the center position.
Do You Have A Phase Problem?
If the bass response in your application appears to be lower
then you expected or sounds muffled and or distorted, you
may be experiencing Phase Cancellation.
Phase Cancellation
When two speakers in the same frequency range produce
sound waves that are inverted from one another or 180° out
of phase, the sound waves will cancel each other out to some
degree. This effect will be heard as a drop in the output level
and/or a muffled or muddy quality in the Bass Response. The
source of this Phase Cancellation can be at any point in the
signal path. The obvious cause of this problem would be a
speaker connection that was reversed in polarity, but that is
not always the case. Sometimes amplifier channels will shift
phase 180° for no good reason, or a signal processor could
have a setting for phase that has been set incorrectly or the
21
ENGLISH
source material could just be recorded in error. Also speaker
placement and the acoustics of the listening environment can
effect the phase. No matter what or where the cause is located,
the solution is an easy one.
PHASE CORRECTING PROCEDURE
Disconnect all but one Bazooka
®
from your system. Be sure
that any loose wire connections are insulated to avoid the
chance of short-circuiting any of the electronic equipment.
Listen to the system and take note of the level of the Bass
Response. Connect the next Bazooka
®
and compare the level
of the combined output to that of the single unit. If the Bass
Response increases, the Phasing is correct and you can repeat
this process on the next Bazooka. If the level of the Bass
Response drops, the Phasing is incorrect and you should reverse
the speaker connections to this Bazooka
®
and compare again.
In short to
INCREASE IS GOOD
, to
DECREASE IS BAD
! Using
this method, any number of Bazooka
®
subwoofers can be kept
in absolute phase.
PRACTICE SAFE LISTENING
Continuous exposure to high volumes of sound may cause
permanent hearing loss. High-powered auto sound systems
are capable of producing sounds well over 130 dB. Even short
periods of play at high volume levels can impair your ability
to hear necessary traffic sounds and may constitute a hazard.
Please use common sense and practice SAFE LISTENING!
22
ENGLISH
