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Old 22nd August 2003, 09:49 PM   #11
diyAudio Member
Join Date: Feb 2001
Location: Mars
Originally posted by Konrad
Thylantyr: please let's know your fuse size.

Mbk : I am talking aktive x-over.
Fuse size is dependent on your driver and power. You have
to experiment with your setup.

First you need to turn on your stereo system to the maximum
level you feel comfortable that the drivers won't blow up.

Second, you insert inline fuses starting with low amperage
ratings and progressively work up until you find the correct

For tweeters start with 1/2 amp and work your way up
to 1 1/2 amp until you find the sweet spot.

At 1/2 amp, the fuse may blow too early, at 1 1/2 amp,
the fuse may never blow, instead your tweeter may

This is a one-time calibration, then remember which fuse
rating works for you.

3/4 amp or 1 amp fast blow AGC is average for the common system.
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Old 23rd August 2003, 12:30 PM   #12
diyAudio Member
Join Date: Jul 2003
Location: Newcastle, Australia
In my main domain of pro audio, where HF driver diaphrams are hundreds of dollars, and solid state amplifiers can & DO develop faults where DC voltage can appear on the outputs, we DO use such DC blocking capacitors. If the value is high enough, then there is no discernable degredation to the system.

In your case, a lot will depend on your perceived likelyhood of anything going amiss.

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Old 23rd August 2003, 02:42 PM   #13
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Join Date: Jun 2003
Location: Menlo Park, CA
So what's a high enough value? Placing the pole an octave below XO shouldn't affect the frequency response, but what about phase shift? Two octaves below seems consistant with other aspects of XO design?
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Old 23rd August 2003, 08:15 PM   #14
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Join Date: Jun 2003
Location: Wroclaw
Wouldn't it be easier to put some relay with some delay at the output of the power amp feeding the tweeters?
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Old 24th August 2003, 06:36 AM   #15
Konrad is offline Konrad  Norway
diyAudio Member
Join Date: Jun 2003
Location: way up north
Relay at the output? (as DC switch of/fuse ) The responsetime is normaly set minimum 1/2SEC or more. More important is the amp's DC drift, There should not bee any! anny value abow ca50mv is not tolerable. Then designing a dc sensor with this sensitivity, and not a to loong responsetime ( in case of failure ) is quite a task. I prefer DC blocking Cap's And DC sensor to switch of the output of amp.
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