On 29/03/2016 11:39 AM, wrote:
"**Fuses open in seconds. Semiconductors can fail in MILLISECONDS.
Active current limiting is the best solution. "

Yeah like when seconds count, the cops will be there in minutes.
Completely true. The problem is the implementation.

Active current limiting tends to make bad bad distortion on low
impedance loads. It sounds as if a speaker is blown or a woofer is
bottoming out.

**Nonsense. There are several methods of implementing current limiting,
which do not impact severely on sound quality. If the current limiting
can be kept out of the global NFB loop, then the result can be very benign.


I have tried to figure out a better way but am at a loss on that, so
I understand why they did it. It protects their product from abuse
and unnecessary warranty claims. And it was cheap, couple
transistors, diodes, maybe six resistors in all.

The alternative is to use a relay and a latch, which is run through
the uProcessor on newer **** and it reads "Protection" on the
display. I am not fond of those type of circuit because it makes it
harder to troubleshoot.

I think they should make amp ready to drive one ohm loads, but then
they would be more expensive and sales would be lost.


**That is the way high quality products do it.



--
Trevor Wilson
www.rageaudio.com.au

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