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Old 12th February 2013, 10:05 AM   #1
Tyimo is offline Tyimo  Hungary
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Default Speaker protecion for F5

Hi!
What should be the ideal speaker protecion for the F5 or any direct coupled relatives?
Is there any "official" solution?

Greets:
Tyimo
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Old 12th February 2013, 10:13 AM   #2
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In a word, there is no official solution. I believe the original design relies upon the sturdy design to protect itself.
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Old 12th February 2013, 11:18 AM   #3
ianc13 is offline ianc13  United Kingdom
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While there isn't an official line on this if you are concerned then have a look in the diyaudio store. There is a PCB set for soft start + speaker protection (2 boards as a set) that will do the job. And you are supporting the forums if you do decide to buy.
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Old 12th February 2013, 11:49 AM   #4
Dzius is offline Dzius  Poland
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According to F5 manual there should be no more than 25mV at the speaker output, so isn't dangerous unless there is any fault.
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Old 12th February 2013, 11:59 AM   #5
ianc13 is offline ianc13  United Kingdom
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Alas I had one channel of my F5 go pop and trigger one of my speaker protection boards. It was during normal operation so, while rare, these things can happen!
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Old 12th February 2013, 12:24 PM   #6
willamp is offline willamp  United States
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Early in my F5's life it was accidentally left on for a couple of days. When I had been using it the heatsinks had never gotten over 48 C but somehow during this couple of days something happened and the fuse blew. I found both output mosfets on the failed channel were now burned out. I had no speaker protection on it at the time but fortunately my speakers were switched to a different amp via a switchbox and weren't connected to the F5. After this I added the store's speaker protection board and lowered the bias from 1.3 to 1A after replacing the mosfets and source resisters. I haven't had any trouble with it since but definitely wouldn't go without the speaker protection again. And also, of course I'm much more careful that it doesn't get left on.
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Old 12th February 2013, 02:36 PM   #7
Dzius is offline Dzius  Poland
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Guess it had something to do with P1 and P2 potentiometers quality.
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Old 12th February 2013, 02:58 PM   #8
Tyimo is offline Tyimo  Hungary
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Quote:
While there isn't an official line on this if you are concerned then have a look in the diyaudio store. There is a PCB set for soft start + speaker protection (2 boards as a set) that will do the job. And you are supporting the forums if you do decide to buy.
Thanks!
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Old 12th February 2013, 05:03 PM   #9
willamp is offline willamp  United States
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Quote:
Originally Posted by Dzius View Post
Guess it had something to do with P1 and P2 potentiometers quality.
Not sure what you mean about the pots. If you're referring to me lowering the bias, I only did that to be safer, and run a little cooler.
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Old 13th February 2013, 12:04 AM   #10
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Gogle up NTE 7100 I am using those and Amplimo relay on my F5
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