Sub is around 10 years old, Athena AS-P400 10" driver, 100W mossfet amp.
Denon AVR 1712 receiver connected using an RCA Low Level Sub In cable.
I've had a problem with this sub a few years ago, it stopped outputting any sound, if I remember correctly...
I paid $100 for parts/labour, the guy might've changed a switch? I can't remember...
The sub worked OK since that repair (maybe 5 years ago) until a couple of days ago when while watching a movie,
it suddenly made a loud popping noise (during a bass intensive scene) and the volume dropped to barely audible.
It looks like there's still power going to it, the LED is on, but I can barely hear it, even at max volume.
I unplugged the sub from power for a few minutes, I switched the Low Level RCA from "sub in" to "direct in",
Checked settings on my receiver, still very low sound.
I removed the amp to take a look at the fuse, it looks OK...
Capacitors also appear to be OK (not blown or leaking).
I see some yellow spots around power and fuse connectors on the board, not sure if that is corrosion and
if it'd affect the amp?
Some pics attached.
I have a volt meter and am handy with a soldering iron, but I need help with further testing
Can anyone help with troubleshooting?
Any help would be greatly appreciated!
- Front-mounted controls
- Auto on/off (with dual-LED indicator)
- Adjustable bass level
- 10" injection-molded polypropylene driver (with rubber surround)
- 100W MOSFET amplifier
- Front-ported design
- High-level (speaker) connections
- Mono line-level input
- Direct Input to bypass crossover
- Internal protection circuitry
- Anti-clipping circuitry