Overheating Sub 15
Got a Sub15 that I've had for about two years. It hasn't been used much as we were building a house last 18 months so it sat in storage.
Recently I found it keeps shutting down - I suspect thermal issues as it gets VERY hot on the amp back plate.
It's certainly too hot to keep your hand on the plate amp for extended period of time.
I have the gain at about 50% and listening to around 100db in room. I'm not exactly pushing it to silly levels and this is watching a movie not test tones.
It's not clipping and it merely shuts off for about 5 seconds and then back on but unless I turn it down substantially it merely enters a cycle of 5 sec on / 5 sec off.
I moved the Sub from auto to trigger as I felt even while 'idling' the amp got warm. However it stills appears to be pulling significant current from the wall socket as the amp
is cooler than 'auto' but not by much. This has always bothered me as I had a Servo 15 for 8 years without a hiccup. The marketing claims and I quote
"Dual Efficient Ultra-Class-D™ Amplifiers with Switching Power Supplies. Boast more than 90% efficiency!" are surely impossible with this much heat being generated.
I have a Rotel 1575 Class-D amp (5x 250w) and it can takes hours of abuse and never gets nearly as hot as the Sub15.
If I'm doing a system demo (pushing over 110db) the Sub15 really battles and often within 60 seconds it shuts itself off.
I have equalized the system and running the EQ off a SVS AS-EQ1.
At reference 0 volume on Yamaha receiver - speakers are at 77db + Sub15 is at 80db.
Sub level on Amp is -9 (Range -10 to +10)
Everything seems okay to about 90db in room (Radioshack SPL Slow-C) but totally unstable at higher volumes.
Room size - 5.8m x 5m
Ceiling height - 2.6m
Ave Room Temp - 25 C / 77 F (summer here now)
Any owners out there in warmer climates having thermal issues with Sub15?
Anyone have any ideas that I can try - My three year warranty expires on the 8th of February but I need something substantial that I can get the dealer/distributor to
test and confirm is an issue.