Specifications

Amplifiers

(3) Indicators

The APL-10/12 speakers have a green LED labeled PWR (Power) that indi-

cates AC mains power is applied and the power supplies are functioning

properly. A green Signal LED is above the level control. An amber LED just

above the power LED indicates clipping. A red LED labeled PROT (Protect)

is provided to indicate that the amplifier has gone into protect mode. Protect

mode occurs under the following conditions:

(a) The amplifier has exceeded its maximum safe operating temperature (the

amplifier will automatically reset after cooling down).

(b) The amplifier has failed and is outputting DC voltages that could damage

the driver(s), or DC is present upstream of the amplifier due to component

failure in the processor.

output voltage.

(d) The amplifier has failed to pass its automatic internal start-up test.

If conditions b, c, or d are encountered, the amplifier will latch in the Protect

mode until the power is cycled to force a reset. However, if the fault condi-

tion has not been repaired upon power-up, the amplifier will again enter into

the Protect mode.

(1) Overview

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

dual, fully-independent amplifiers. Each amplifier is capable of delivering over

1200 watts of music power.

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 fil-

ters.

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.