Apogee APL-220, Руководство пользователя

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(2) Input and Output Connectors
The input and output connectors are wired as follows:
XLR Pin # Function
Pin 1 Earth & Chassis Ground
Pin 2 DIFFERENTIAL INPUT
Pin 3 Signal - DIFFERENTIAL INPUT
Connector Case Earth & Chassis Ground
A positive signal applied to pin 2 of the XLR will result in a positive acoustic
pressure wave (excursion) appearing at the front of the drivers in the speak-
er system. Conversely, a positive signal appearing at pin 3 of the XLR will
result in a negative acoustic pressure wave (recursion) appearing at the front
of the speaker system’s drivers.
Overview
The internal amplification package consists of dual, fully-independent power
supplies and dual, fully-independent 500-watt RMS,
1 600-watt peak, digital
amplifiers. One channel is utilized for the low frequency driver and the other
channel is used for the high frequency driver, hence the term "bi-amped."
These amplifiers and power supplies use numerous, proprietary design fea-
tures that result in extremely low distortion, high reliability, and a very low
heat by-product. No fans are used or needed, eliminating the risk of a
mechanical device becoming noisy during a quiet performance due to bear-
ing wear or contamination. The absence of fans also greatly simplifies main-
tenance, by eliminating the need to regularly check and clean air intake filters.
Unlike some competing designs, the amplifiers used in Apogee powered loud-
speakers are designed to drive normal 4- and 8-ohm loads. Due to an excep-
tionally high voltage swing, the Apogee design does not require unusually low
impedance drivers in order to develop full power. Very low impedance driv-
ers (
1- or 2-ohm) have a low BL-product and typically exhibit poor damp-
ening and transient response, resulting in a loss of clarity.
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Amplifiers