Specifications

are working properly.The LED will illuminate only if the following three con-

ditions are met: audio is present at the input connector; the amplifier(s) are

operating properly, and the LF drivers are functioning properly.This indicator

is especially useful as an aid in visually checking large systems, where failure

of one subwoofer might otherwise go unnoticed.

(1) Overview

The internal amplification package in both the APL-10 and -12 consists of

dual, fully-independent power supplies and dual, fully-independent 1000-watt

power amplifiers.

The APL-SB includes one power supply and one 1000-watt power amplifier.

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.

Patented Primary Drive Control

™ power supplies drastically reduce the

overall size and weight of each speaker. Each 1000-watt amplifier, also patent-

ed, uses an output configured as class A/B but with the advantage of inte-

grated, continuously tracking supply rails,thereby maintaining minimal voltage

drop through the output devices regardless of amplitude. The result is effi-

ciency that rivals a switching-type amplifier, but with the sound quality of a

linear amp.

The unique design of the amplifiers also results in the ability to provide

exceptional transient response. This equates to a wider dynamic range and

more low-frequency “punch” than that of conventional amplifiers of a similar

power rating.

(2) Special Functions

The APL-10, -12, and -SB are equipped with a SLEEP mode.After initial acti-

vation, the system constantly seeks an input signal. If no signal is present for

approximately 30 minutes, the SLEEP circuitry will shut down the main

power supplies, the amplifier, and all but one section of the processor.When

in sleep mode, the yellow LED labeled SLEEP will illuminate on the rear panel.

Whenever a signal does occur, the system will rapidly “wake up,” ready for

use.The system awakens with a signal of any nature, from 20 Hz to 10 kHz,

applied at a level of -20 dBu or greater.

Amplifiers