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Operating Manual - Powerflex Multi-Channel Power Amplifier

11.2

Distorted Sound

1.) Clip LED is flashing regularly

Amplifier is being overdriven. Turn down the in-

put level control, or reduce the output level from the sig-

nal source.

2.) Clip LED is not flashing at all

Amplifier input signal may be exceeding input

headroom, which is greater than +12dBu, or 3.4V rms

(measured using continuous 1kHz sine wave). Incoming

signal level higher than +12.8 dBu will cause distortion in

the amplifier. Turning down the input level controls will

not eliminate distortion if the input headroom is exceeded.

Turn down the output level of the device driving the am-

plifier instead.

Additionally, an input signal may already be dis-

torted before it gets to the amp. Check to see if a piece of

equipment in the signal chain before the amp is clipping.

For best performance, the amplifier should be operated with

input levels fully CW. Also check for damaged speaker

drivers that could cause distorted sound.

12.

POWERFLEX DIMENSIONS

11.3

Hum or Buzz Noise

Be sure that the power cord's 3-prong plug is con-

nected to a properly earth-grounded outlet. Lifting the

grounding third prong may not improve hum or buzz and

can create a potential shock hazard.

Hum is usually caused by ground currents flow-

ing between different pieces of equipment. Ground cur-

rents can be minimized by using a single point AC ground

for the sound system, and by using balanced connections

with quality cable throughout the audio path.

Buzz, as well as certain audible high frequency

tones, can be caused by environmental emissions such as

lighting dimmers, neon lights, or computer equipment. Use

balanced connections, and try moving the amplifier, wir-

ing, lighting, or other equipment to different locations to

isolate the source of the noise.

Sections 3.3, 5.3, 7.1, and 7.2 further discuss is-

sues related to grounding and noise problems.

Powerflex

6250