Last night at my house party, my speakers suddenly stopped working.
They just don’t turn on. I thought maybe the fuse had gone, so i changed it, with no joy.
However, since then they’ve turned on, worked for about a minute, then stopped working again, two or three times. After stopping working again, they won’t turn on again for a fair while.
There’s no signs of liquid damage, I just wondered if anyone could think of something that may have happened to them.
Can they over-heat or anything?
It could be a loose connection, but the turning on then stopping working again thing wouldn’t happen, would it?
They’re these ones. http://www.amazon.co.uk/Logitech-X-230-Multimedia-Speaker-System/dp/B00069ZEA6/ref=sr_1_1?ie=UTF8&s=electronics&qid=1237757182&sr=8-1
As you can see from the pics, the casing on the Sub has few places where it can be opened, and the speakers have no visible screws whatsoever, so opening it up may be a problem.
So, the question - does anyone have any idea what could have happened to them?
Mods - If this thread doesn’t constitute a proper general question, by all means move it please
One of your neighbors really is a witch?
Seriously, if you short across the speaker wires, it’s possible that you blew out your amp, although I think newer amps are supposed to protect against this these days. (Don’t ak me how I know this.)
Do you have another set of speakers you can hook up?
both speakers at the same time? Not likely. Probably shorted out the amp.
Many amplifiers have a thermal protection circuit that’ll shut down the output if the amp gets too hot, and let it work again after it cools off.
One of the reasons that an amp may run hot is if a speaker is drawing too much current, as in this scenario:
You’re playing the stereo at a party, so it’s turned up loud - putting out close to it’s peak power (with a good bit of distortion in the output) - and the poor speakers can’t handle it. So a speaker voice coil overheats, creating a permanent short in the speaker, and the amp sees this, so it shuts down.
You could try playing the stereo with only one speaker at a time connected, to see if the amp tolerates any of the speakers. If it does, the amp is likely OK (try both channels just for grins). If it doesn’t, then you either have a bad amplifier, or a batch of shorted speakers (happens, but rarely) or both. So then try hooking up a known-good speaker (or just skip to this step out of the gate), and see if the amp tolerates that speaker on each channel. Replace parts as necessary.
And remember to turn off the amp before connecting/disconnecting any speaker.
You may have also blown the output stage of the amp, and a speaker protection circuit is kicking in - if the output stage has blown, then the output is switching DC (bad for the speaker coils), and a DC detection circuit disconnects the speakers on a relay timer. Of course, for your system the amp is probably a (so-called) digital amplifier chip, which may have an entirely different failure mode to the Class A/B/AB amplifiers - YMMV.
But it is most likely you have blown the speaker coils.
Si