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Old 10th December 2006, 11:40 AM   #1
d3imlay is offline d3imlay  United States
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Default Ouput relay vs low end response

I'm playing with some output relay disconnects for DC. Their is a tradeoff of delay time in the detection to avoid nuisance trips and low frequency response. If it is assumed the amp is used for subs, is a response to 20 Hz adequate?
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Old 10th December 2006, 12:36 PM   #2
AndrewT is offline AndrewT  Scotland
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Hi,
you asked for an opinion.

Absolutely not.
Not even for a bass speaker.

aim for F-3db @ 1Hz to 2Hz for sub-bass and bass driving.

As for false triggering on low bass notes, I suggest the detect/trigger should allow 20Hz at full output voltage to pass.

For a sub this could be as low as 10Hz @ full output voltage.
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Old 10th December 2006, 11:23 PM   #3
djk is offline djk
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The Hafler DH500 has a three-pole lowpass filter in the DC detect circuit. It will allow full power response to 8hz and still trip at about 1.5V DC.

http://www.hafler.com/techsupport/pd...00_amp_man.pdf

(page 16)
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Old 11th December 2006, 07:24 AM   #4
AndrewT is offline AndrewT  Scotland
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Hi,
how quickly does the Hafler trip @ 1.5Vdc?

It's all about time and frequency and delay.

I would like to model this, but I don't know how.
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