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Multi-Way Conventional loudspeakers with crossovers

Crossover makes amp go into protection mode
Crossover makes amp go into protection mode
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Old 17th April 2019, 09:34 PM   #11
MarcelvdG is online now MarcelvdG  Netherlands
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If you tested with unloaded crossover outputs, that might bring your amplifier to the edge of instability. Because of component tolerances, it could be just over the edge with one crossover and just before the edge with the other one. That is, neither crossover would then be broken.

On the first picture of the copper side of the crossover in the first post, it looks like the soldering of a wire between the upper two tieraps is not good, but it is difficult to see whether it really is loose. It might just be the shadow of the wire that makes it look like that.
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Old 17th April 2019, 09:51 PM   #12
Defo is offline Defo  Norway
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Quote:
Originally Posted by wolf_teeth View Post
Did you also check the drivers?
Wolf
Yep, all good there
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Old 17th April 2019, 09:53 PM   #13
MAAC0 is offline MAAC0  Portugal
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It's just one channel ? Does the speaker connected to it actually produce sound ?
Did You test on the other channel too ?
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Old 17th April 2019, 09:56 PM   #14
rayma is offline rayma  United States
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Quote:
Originally Posted by Defo View Post
Yep, all good there
If you switch (only) the crossovers between channels,
does the other channel's amplifier then go into limiting,
and does the original limiting amplifier now work ok?

If not, the amplifier itself probably has a fault.

Last edited by rayma; 17th April 2019 at 10:00 PM.
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Old 17th April 2019, 10:00 PM   #15
Defo is offline Defo  Norway
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Quote:
Originally Posted by MarcelvdG View Post
If you tested with unloaded crossover outputs, that might bring your amplifier to the edge of instability. Because of component tolerances, it could be just over the edge with one crossover and just before the edge with the other one. That is, neither crossover would then be broken.

On the first picture of the copper side of the crossover in the first post, it looks like the soldering of a wire between the upper two tieraps is not good, but it is difficult to see whether it really is loose. It might just be the shadow of the wire that makes it look like that.
The bad crossover makes the amp go into protection both with the drivers connected and without, whereas the amp doesn't care with the good one (normal operation both with and without load).

Double checked now, and no loose wires anywhere. One of the solder points have a bit of a "dirty" / "burnt" tin. Measures fine tho, so shouldn't be an issue?

Quote:
Originally Posted by MAAC0 View Post
It's just one channel ? Does the speaker connected to it actually produce sound ?
Did You test on the other channel too ?
Tested both boards loaded and unloaded. With the broken board, the woofer and tweeter makes a popping sound when the amp goes in and out of protection mode.
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Old 17th April 2019, 10:17 PM   #16
Defo is offline Defo  Norway
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Quote:
Originally Posted by rayma View Post
If you switch (only) the crossovers between channels,
does the other channel's amplifier then go into limiting,
and does the original limiting amplifier now work ok?

If not, the amplifier itself probably has a fault.
The issue follows the crossover, i.e same issue on both channels.
The amp (ICEpower 300ASC) does seem to have independent protection for each channel (only the one with the bad crossover goes into protection).
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Old 18th April 2019, 08:48 AM   #17
wolf_teeth is offline wolf_teeth  United States
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There was a time when I had zip-tied down a coil, and the ratcheting of the part to the board allowed the urethane on 2 places of the coil to rub and short out. It is possible that the coil in the tweeter spot might be doing this. This could look like a short to the amp.

Later,
Wolf
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Old 18th April 2019, 10:40 AM   #18
Defo is offline Defo  Norway
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Quote:
Originally Posted by wolf_teeth View Post
There was a time when I had zip-tied down a coil, and the ratcheting of the part to the board allowed the urethane on 2 places of the coil to rub and short out. It is possible that the coil in the tweeter spot might be doing this. This could look like a short to the amp.

Later,
Wolf
That would cause it to measure 0 ohms I reckon?
Both coils measure ~0.8 ohms.
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Old 18th April 2019, 11:25 AM   #19
afa is offline afa  Australia
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Hi, check for dry joints, resolder them all, I recently had to work on a crossover that was tripping out a new fangled home theatre amp and it turned out to be a dry joint on one of the cap leads.
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Old 18th April 2019, 09:25 PM   #20
Defo is offline Defo  Norway
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Quote:
Originally Posted by afa View Post
Hi, check for dry joints, resolder them all, I recently had to work on a crossover that was tripping out a new fangled home theatre amp and it turned out to be a dry joint on one of the cap leads.
Thanks! After reading about "dry joints" I think I might have some.
What's the best way to remove the old solder without making a mess?
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