Excessive Hiss Noise; Excessive Hum Noise; Dimensions - Ashly SRA-120 Operating Manual

Operating Manual - SRA-120 Power Amplifier
• Signal present indicators active but clip LED is not:
Applied input signal is distorted before it gets to
the amp. Check to see if a piece of equipment in
the signal chain before the amp is clipping.
Normally the amplifier should be operated with
input levels fully CW to maximize headroom in
the signal source. Also check for damaged
speaker drivers that could cause distorted sound.
If distorted sound is still heard, there may be an
internal problem. Call Ashly Audio service department at
1-800-828-6308.
10.3

Excessive Hiss Noise

If an excessive hiss noise is heard relative to the
signal level, then the amplifier may not be getting
a strong enough input signal. Push the rear panel
sensitivity switch to the out position and increase
the output level of the audio source which feeds
into the amplifier. If excessive hiss noise is still
heard, then a noisy signal is being fed into the
11.

DIMENSIONS

SRA-120. Isolate which piece of equipment in
the audio chain is causing the noise. The audio
source medium itself may contain the noise.
10.4

Excessive Hum Noise

This is usually caused by "ground loops" in the
system wiring. In a complex sound system where
there are many components separated by
significant distances and where several power
outlets are being used, there are many
opportunities for this problem to occur. If
possible, feed every component in the system from
one power source with a single ground point. Use
balanced input and output connections between
widely separated components. If a hum noise still
exists, the SRA-120 signal ground can be
disconnected from its chassis ground by removing
the jumper strap from the input barrier strip.
If you still need help, get in touch with your Ashly
dealer, or call Ashly direct: (800) 828-6308. In New
York State, dial (716) 872-0010.
11