18
7. ADJUSTMENT OF THE CONTROL FUNCTIONS
7.7 PHASE SHIFT CONTROL
The phase shift control - to be activated by the ON/OFF switch - provides you with a simple "tool" to
match the front door installed satellite system with the subwoofer playing in the trunk compartment of
your car. The phase shift control is used to achieve a good match of the phase (time) relation between
satellite and subwoofer system. The phase-shift function is only to be used, if the corresponding chan-
nels of your EMPHASER amplifier drive a subwoofer system. The phase-shift shall not be used for
Kickbass and for satellite speaker systems!
Since the satellite speaker system and the subwoofer are playing in locations separated by at least
2.5m of distance, there is always a time (or wave length) difference between these two speaker
systems. A difference in phase bigger than 90° will cause a partial cancellation of the frequencies that
are radiated at the specific crossover point. Two effects derive from this fact: 1. the sound reproduc-
tion is not as tight as it can be, and 2. the subwoofer can easily be localized to play in the trunk of
your car.
There is no rule of thumb, so this setting must entirely matched by ear! The assistance of somebody
adjusting the phase shift in the back of your car, while you monitor the change of sound, sitting on the
drivers seat location - complicates this matter. At least, you need a buddy to help you and an optimi-
sed phase match between satellite speakers and the subwoofer is well worth the efforts!
EA 2/4-CH Manual 12.03.2002 12:55 Uhr Seite 18
