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Active Equalization
WARNING: All Panaray
¤
LT Series III loudspeakers require active equalization. Do not operate the loudspeakers
without the proper active equalization for the particular loudspeaker and operating configuration. Failure to do
so may result in permanent damage to the loudspeaker.
Active equalization with the Bose
®
1600-VI or 1800-VI amplifier
When using the Bose 1600-VI or 1800-VI amplifier to power Panaray LT Series III loudspeakers, optional active equaliza-
tion cards are available from Bose. These cards install inside the rear of the 1600-VI or 1800-VI amplifier. The equalized
signal from one 1800-VI amplifier can be daisy-chained to other amplifiers that use the same audio signal as the first loud-
speaker (same equalization, in the same configuration, with the same time delay, etc.). Usually only one EQ card is
required for each loudspeaker type in a cluster.
Other methods of providing active equalization
If you are using a non-Bose amplifier, the Panaray system digital controller can provide active equalization for the LT
Series III loudspeakers. A parametric equalizer can also replicate the active equalization curve below along with a high-
pass filter and low-pass filter. The active equalization curves are located in the Acoustical Specifications and Wiring sec-
tion.
LT Series III Mid/High Loudspeakers
When using the loudspeakers in the passive mode, there is a different EQ card required for each of the four loudspeakers.
These equalization curves are designed for a single loudspeaker.
When several loudspeakers are used together in a cluster, coupling in the low mid-frequency often occurs which boosts
these frequencies. There is a jumper on the EQ cards that compensates for this coupling phenomenon. Cutting jumper
C20 decreases the low mid-frequency equalization (by 4dB at 200Hz).
In bi-amplified mode, one mid-frequency EQ card is available for use with any of the three Panaray LT Series III loud-
speakers. This EQ card is used to provide an equalized signal for the mid-frequency (V2) driver only.
In bi-amplified dual mid range mode (LT 3202-III only), the mid frequency EQ card should be used for each pair of V2 driv-
ers.
LT MB24 Modular Bass Loudspeaker:
The LT MB24 requires the same active equalization for both parallel and discrete modes.
EQ Card Product CodesPC
LT 3202
®
-II/III Passive EQ Card 011502
LT 4402
®
-II/III Passive EQ Card 011504
LT 9702
®
-II/III Passive EQ Card 017929
LT 9402
TM
-III Passive EQ Card 035325
LT Series II MF EQ Card 018485
LT MB24-III/MB4 EQ Card 027058