Stereo Distributed Speakers - JBL Control 24C Application Manual

Connection of Hybrid Bi-Amplified Speaker System
70V/100V Full-Range (or High-Passed) Speakers and Low Impedance Control 19CS
Subwoofers
(mono shown — duplicate for stereo, or use crossover that provides mono subwoofer feed)
High-Pass or
Full-Range
ACTIVE
Low-Pass
CROSSOVER
Note: JBL MPC-T amplifiers have the ability to simultaneously drive a 70V/100V line from one channel
and low impedance speakers on the other channel, such as shown in diagram.
Stereo Distributed Systems
Stereo systems are becoming popular in higher-end business music applications. Stereo can add a
sense of spaciousness to the listening environment, but is slightly more expensive to implement. Stereo
requires additional amplification channels and sometimes a more expensive controller/mixer/preamp.
It also requires a stereo source and more complex line and loudspeaker wiring.
Speaker Expense for Stereo – Stereo often does NOT require much higher expense when it comes to
the loudspeaker portion of the system. With the importance of audio to the business music
environment, it is often worth the additional cost to make the system stereo instead of mono.
Speaker Density for Stereo – While stereo can be accomplished adequately with the normal mono
layout density, there are opportunities for even better stereo sound by selecting one of the tighter
density patterns.
Left/Right Configuration – Laying out a distributed system stereo is simply a matter of assigning
every other speaker as a left or a right speaker. In this way – with the left and right speakers staggered
throughout the room – there is no "true" left or right side of the room. Regardless where a listener is
located in the room, they hear both the right and left channels from nearby speakers. Even those
listeners located right under one of the speakers hear some of the other channel from the adjacent
speakers.
Paging in Stereo Systems – It is important that the paging signal go to BOTH the left and right
channels equally so that pages come through in mono and everyone can hear them.
+
70V/100V Output
–
One Amplifier Channel
+
DIRECT Output
–
One Amplifier Channel
+ – + – +
+
– + –
Subwoofer Subwoofer
To
Add'l
Spkrs
–
To
Add'l
Spkrs
19