Line level sub out?

[SHRED]

I finally isolated my HU's(Alpine CDA-9827) problem to the SUB OUT. It
is intermittent and then stops working.
In the mean time, during the isolation tests, I got the SUB OUT to work
for about 15 minutes and both 20A fuses on my JBL 300.1 sub amp burned
through when the amp got HOT!.

My question:

Can line level SUB OUTS be so screwed up that they could cause this to
happen to the sub amp? I am trying to determine if this was a
coincidence or not?

THanks

[MOSFET]

> I finally isolated my HU's(Alpine CDA-9827) problem to the SUB OUT. It
> is intermittent and then stops working.
> In the mean time, during the isolation tests, I got the SUB OUT to work
> for about 15 minutes and both 20A fuses on my JBL 300.1 sub amp burned
> through when the amp got HOT!.
>
> My question:
>
> Can line level SUB OUTS be so screwed up that they could cause this to
> happen to the sub amp? I am trying to determine if this was a
> coincidence or not?
>
> THanks

Well, it's unlikely that these two events are related, but something does
come to mind. It's possible that your Alpine's subwoofer line level output
is messed up in such a way that it is creating subsonic distortion or some
type of subsonic hum. While not apparently audible, such a problem would
cause your amp to get really hot and perhaps blow fuses as you describe.
However, please know that this is only a guess.

MOSFET

[SHRED]

MOSFET wrote:
>>I finally isolated my HU's(Alpine CDA-9827) problem to the SUB OUT. It
>>is intermittent and then stops working.
>>In the mean time, during the isolation tests, I got the SUB OUT to work
>>for about 15 minutes and both 20A fuses on my JBL 300.1 sub amp burned
>>through when the amp got HOT!.
>>
>>My question:
>>
>>Can line level SUB OUTS be so screwed up that they could cause this to
>>happen to the sub amp? I am trying to determine if this was a
>>coincidence or not?
>>
>>THanks
>
>
> Well, it's unlikely that these two events are related, but something does
> come to mind. It's possible that your Alpine's subwoofer line level output
> is messed up in such a way that it is creating subsonic distortion or some
> type of subsonic hum. While not apparently audible, such a problem would
> cause your amp to get really hot and perhaps blow fuses as you describe.
> However, please know that this is only a guess.
>
> MOSFET
>
>
Thanks again MOSFET.

Now the latest.

I forgot about the tiny "reset" button on the deck face. DOH!

Well I pushed it and now all is well. My Alpine sub amp drives the sub
fine. I think the JBL sub amp has some internal problems but I plan on
replacing the fuses and trying it again post "reset" button activation
on the HU.