MT HT-TX52 WORKED FOR A COUPLE OF MONTHS, THEN THE SUB WOOFER WOULD MAKE A VERY LOUD CRACKELING NOISE ALL OF A SUDDEN, BUT ONLY ONCE IN A WHILE, SO I UNPLUGGED IT AND JUST RAN THE OTHER 4 SPEAKERS. WORKED FINE FOR A YEAR NOW I AM HEARING THE SAME LOUD CRACKELING ON ANOTHER SPEAKER. IT'S DRIVING ME CRAZY, I THOUGHT IT WAS A SPEAKER PROBLEM BUT IT THINK ITS A RECIEVER. ANYONE ELSE HEARD OF THIS?

besides I must warn You - pay attention what kind of UPS You use to supply your system with clean power.Line interactive UPS is NOT a good solution as it has some very short time of black out when conecting the battery and this short time of black out - about 10ms - can destroy very sensible parts in any amp.The ONLY solution is a so called double conversion UPS - the battery is always supplaying your unit with power so if black out occur ,You have always 220 v besides I must warn You - pay attention what kind of UPS You use to supply your system with clean power.Line interactive UPS is NOT a good solution as it has some very short time of black out when conecting the battery and this short time of black out - about 10ms - can destroy very sensible parts in any amp.The ONLY solution is a so called double conversion UPS - the battery is always supplaying your unit with power so if black out occur ,You have always 220 v