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In Reply to: also just remembered that this morning posted by snkby on February 2, 2007 at 22:10:17:
It is hard to connect the dots. Only so much you can do over the net. Some of the DC offsets you mention seem a little high. 10ma is bad enough but a 100ma isn't okay with me.A tube amp doesn't like to see an open ciruit to the speakers and a transistor amps doesn't like to see a short. I don't know where a digital amp stands. The speaker doesn't care as long as it is external.
When something unexplained happens, out of the blue for no good reason, I think power blink stuff. That said, a constant DC offset from a source amplified by the rest of the chain can indeed overheat and damage a voice coil. The speaker intended to do the bass is the one that isn't going to have any blocking cap and therefore most vulnerable despite having the biggest voice coil.
So I guess I'd be looking to see what DC offset I had going to the drivers. And with active (op amp) crossovers a simple power blink could possibly throw a lot of DC out.
Doubt I helped but a few things to consider.
Follow Ups:
something there.the batteries supplying the power for the xover were from my powertools and being used just for testing.
i had to rig the power leads with tape and at 1 point lost power because the tape on 1 contact got loose.
i wonder if 1 of the taped leads arced on the battery terminal ?
but then why only the right speaker and the side that has the lowest dc offset throughout ?
bought a xformer yesterday to make a real psu for the xover.
watching the kids all day so it will have to wait until tomorrow.
alligator clips, tape, power tool batteries???this sounds like a disaster... are you really surprised you're having trouble with your "prototype" system?
wrong with batteries whether powertool or not ?and who doesnt use alligator clips ?
you live and learn (hopefully) and what i learned was to not trust power connections to iffy electrical tape.
building the --real-- psu today. :)
and --prototypes-- especially first tries are usually cobbled together with whatever is at hand.
if one of your supply rails on a differential PSU fails - one that has a +, - and ground (i.e has a potential of 0v (ground potential) for what-ever reason, that will produce a large offset that will be amplified.Comfortably enough to fry a voicecoil using your normal amp.
Hope this helps
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