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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, 04:38 PM   #1
Defo is offline Defo  Norway
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Default Crossover makes amp go into protection mode

Hi!

I've just assembled a pair of Volt 10 crossovers from DIY Sound Group.
However, I have a peculiar issue with one of the crossovers.

When hooking it up to the amp, it makes the amp go into protection mode.
The other crossover is fine, and I can't see any differences between the two

What could cause this? I've attached a bunch of pictures...
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Old 17th April 2019, 04:52 PM   #2
rayma is online now rayma  United States
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Quote:
Originally Posted by Defo View Post
When hooking it up to the amp, it makes the amp go into protection mode.
Possibly a bad or damaged part, or a solder bridge.
Even a new pcb alone can have a fault like a short.
I've found shorts on pcbs underneath connectors
Use an ohm meter for finding shorts.

Last edited by rayma; 17th April 2019 at 05:03 PM.
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Old 17th April 2019, 04:57 PM   #3
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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The most likely cause is a short circuit on the input side. Check the capacitors are not short circuit first.
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Old 17th April 2019, 07:04 PM   #4
Defo is offline Defo  Norway
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I have a multimeter, but no idea how to use it
How do I use it to check for a short?
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Old 17th April 2019, 07:09 PM   #5
MarcelvdG is offline MarcelvdG  Netherlands
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Did you load all outputs of the crossover with loudspeakers or power resistors? If not, the LC filters that comprise the crossover will essentially short the amplifier at their resonance frequencies.
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Old 17th April 2019, 07:14 PM   #6
BigE is offline BigE  Canada
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Quote:
Originally Posted by Defo View Post
I have a multimeter, but no idea how to use it
How do I use it to check for a short?
Measure resistance between two points.

First, set meter to measure ohms, then touch meter tips together. This is the resistance of the leads. Anything measuring this low or lower, should be considered a short.

Do this with the crossover disconnected from the amp:

Touch the probe tips to points that you think ought not be connected. If they read OL ( open loop ) there is no connection.

You may read a higher ohm value between certain points. This implies there is a connection for DC to flow between those two points.
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Old 17th April 2019, 07:19 PM   #7
stratus46 is offline stratus46  United States
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Quote:
Originally Posted by Defo View Post
I have a multimeter, but no idea how to use it
How do I use it to check for a short?
Measure Ohms, resistance. 0 (zero) ohms is great for wires but for your crosover, not good. There are lots of Youtube videos on how to use your meter.

Here is one.

YouTube

G
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Old 17th April 2019, 07:21 PM   #8
Xoc1 is offline Xoc1  United Kingdom
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Just a note that you should not run a crossover without the speakers connected as this can cause a damaging low impedance short at the resonant frequency of the capacitor and inductor.
Ref
Passive Crossover Network Design
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Old 17th April 2019, 09:15 PM   #9
Defo is offline Defo  Norway
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I've now measured every possible connection on the broken crossover and compared it to the working one. And they measure exactly the same
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Old 17th April 2019, 09:33 PM   #10
wolf_teeth is offline wolf_teeth  United States
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Did you also check the drivers?
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