Inter-M PS-80 - Manual (Page 13)

11 PS-80 (FIXED-INSTALLATION 5" POWERED SPEAKER)
· Advantage & precaution of ceiling installation
Install the speaker at the corner of the ceiling or wall
causes lots of energy increase. For listening accurate
sound, tone control by EQ is necessary. Do not
recommend to install at piled up space, but if the user
can improve the sound control by EQ, it doesn’t matter
the location of installation.
Multiple speaker installaton
Even if speaker support a 120 degree wide angel, we
recommend overlapped speaker installation properly,
when numerous speakers are installed nearly. If
narrow and long-distance sound is needed, two
speakers can be installed at less than 120 degree.
However, still less than 90 degree is not
recommended.
Speaker should be installed with proper space, if not, it
cause the low quality of sound due to interference of
speakers. In this case, recommend to install 2 X
distance than speaker and audience distance.
When the speaker is used for sub-speaker, the delay
compensating circuit should be added according to the
distance with main speaker. The playing sound from
multiple speakers arrived to audience at different time.
It might cause lack of sound clearness, sound
degradation, sound dualization etc.