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Old 15th June 2003, 06:38 PM   #1
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Default protecting my speakers from my GC

After blowing up the crossover and drive unit on one of my Kef Q1s with (i think) my gainclone. well im sure it was my gainclone.

How do i protect my speakers from any other gc mishaps?

would just putting a fuse at the speaker terminals work? what sorta amperage?

btw, what couldve caused the speaker to blow. it was playin at low volume..

thanks
Amit
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Old 15th June 2003, 06:50 PM   #2
elizard is offline elizard  Canada
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its not simple as a fuse ..
i found there isn't a need, but you can check out some speaker protection circuits
rod elliot has one on his site, velleman has one ..

check your dc offset btw
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Old 15th June 2003, 06:55 PM   #3
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Velleman K4700 speaker protection kit is OK.
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Old 15th June 2003, 07:02 PM   #4
elizard is offline elizard  Canada
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http://www.velleman.be/common/product.Aspx?id=9233
http://www.qkits.com/serv/qkits/vell...ages/K4700.asp

that's for the velleman kit

http://sound.westhost.com/project33.htm
that's rod elliot's link
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Old 15th June 2003, 07:02 PM   #5
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Of course you must know what you want to protect the speakers
against: DC, oscillations or just too high power?

Which of these things do the Elliott and Velleman kits check?

Edit: OK, oscillations are mostly interesting to detect to protect
the amp, since a Zobel filter should do the job of protecting the
speakers.
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Old 15th June 2003, 07:07 PM   #6
elizard is offline elizard  Canada
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Quote:
Originally posted by Christer
Of course you must know what you want to protect the speakers
against: DC, oscillations or just too high power?

Which of these things do the Elliott and Velleman kits check?

Edit: OK, oscillations are mostly interesting to detect to protect
the amp, since a Zobel filter should do the job of protecting the
speakers.

i don't think he's trying to protect against high power either, since he said he's playing at low power

i'll guess its dc that blew it

as i suggested, check your dc offset .. make sure its low .. mine's at 28mV w/o any problems
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Old 15th June 2003, 07:22 PM   #7
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Quote:
Originally posted by elizard
i don't think he's trying to protect against high power either, since he said he's playing at low power

i'll guess its dc that blew it
Yes, it was hardly high power that blew it in this case. For some
people it might be useful with such protection, though. My
comment was merely a reaction to the fact that people often
speak about speaker protection, without specifying what kind
of protection they mean.

DC is a good guess but I suppose it could be oscillations too,
at least it there is no Zobel filter. Did the amp get hot??

BTW, one must not forget that statistically, things do occasionally
break without any obvious reason, which could depend on
manufacturing defects, fatigue etc. I blew a speaker once
for no apparent reason. I had used the same speakers and
amp for three or four years without problem, and I didn't play
particularly loud. I replaced the faulty element and it never
happened again.
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Old 15th June 2003, 07:23 PM   #8
Thomas is offline Thomas  Denmark
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It must be DC he's talking about...

If you forget to connect (or it breaks later) Vin+ to ground you almost get clean rail voltage at your Vout and Vin- ! Happened to me once. (It's the inverting design I'm using.) I was sensible enough to meassure the creature before connecting it to anything, so no harm was done.
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Old 16th June 2003, 07:57 AM   #9
Nuuk is offline Nuuk  United Kingdom
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Quote:
If you forget to connect (or it breaks later) Vin+ to ground you almost get clean rail voltage at your Vout and Vin- ! Happened to me once. (It's the inverting design I'm using.) I was sensible enough to meassure the creature before connecting it to anything, so no harm was done.
And that's only one way to get nasties on the output! The negative rail connection from my PSU to amp broke and that put 36VDC on my terminals. Like Thomas, I was lucky enough to have tested the amp before connecting the speakers!

I've been testing my GC's with old or cheap speakers so far but will revert to using my Velleman protection modules before connecting up my precious Goodmans 201's.
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Old 16th June 2003, 08:25 AM   #10
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When a load is connected and negative power is missing the protection circuit of the chip kicks-in pretty fast. I would expect most reasonably powerful speakers to be safe. It will be interesting to see how much the relays in your Velleman will affect the sound quality. If the relays i've tried in the past are similar - a lot.

cheers
peter
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