Mute function on the amp
I have a Marantz PM4000 amplifier. It's great and has oomphh BUT,the mute function ocasionally comes in without good reason. I have two pairs of out speaker lines one pair to outside garden outdoor speakers (newly installed), the others to lounge indoors. The fault is intermittent and seems to be irrespective of volume or whichever speaker combination is on. The amp allows either or both sets of speakers then sometimes decides to cut out even at low volume! Cambridge weatherproof outside speakers, Wharfedale Llintons inside. Whats wrong? Appreciate your advice thanks
Bob
Bob
Audio Players & Recorders - Marantz
Answers & Comments
A couple of questions to try and narrow this down:
1) What is the impedence rating for the speakers?
2) When the unit shuts down, will it recover on its own after a little while or do you need to power cycle it to get it to work again?
3) When the unit shuts down, is it hot?
Possible causes of this behavior:
1) Impedence rating too low causing the amp to work too hard and shutdown.
2) Excessive heat (caused by #1?) will shutdown the unit to prevent damage.
3) Possible intermittant short in the speaker wires somewhere? Loose connection?
A little more investigation will be required to find this. A repair shop would run this unit under load and monitor the outputs for heat and any spikes in the signal that could kick in the protection circuits.
Keep us posted on what you find.
Dan