Alesis Matica 900, Matica 500 manual Hum and/or Noise, Thin or Muffled Sound, Audio Cuts In and Out

In Case Of Trouble

Hum and/or Noise	¥Is the signal source working correctly?
	¥Are the systemÕs electrical and audio ground connections
	proper?
	¥Are there any noise-producing sources on the AC mains
	circuit, such as light dimmers, motors, etc.? If so, it
	may be necessary to run a separate power line for the
	audio equipment.
Thin or Muffled Sound	¥Are the loudspeakers all working properly, or are one or
	more drivers defective?
	¥In a multi-amplified system with a low level crossover
	network, are all outputs from the network operating
	properly? Are all loudspeakers properly connected?
	¥Are both sides of a balanced input solidly connected? Is
	the low side of the amplifier input connected to Audio
	Ground with an unbalanced input connection?
Audio Cuts In and Out	¥Is the signal at the amplifier input terminals good?
	¥Are all the input and output wires solidly connected?
	¥If the sound cuts out for a minute or two and then returns,
	is the amplifier overheating and cycling through
	thermal protect mode? If so, check for short circuits in
	the output wiring or excessive ambient temperature.
Channel B Shows Heavy	¥The two black output binding posts have been connected
Clipping, Channel A is OK.	together. These terminals are not at the same
	potential and cannot be connected without special
	wiring consideration. See page 10.

Matica 500/900 Reference Manual 17