Ouput relay vs low end response

d3imlay · 10th December 2006, 11:40 AM

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?

AndrewT · 10th December 2006, 12:36 PM

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.

djk · 10th December 2006, 11:23 PM

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)

AndrewT · 11th December 2006, 07:24 AM

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.

10th December 2006, 11:40 AM	#1
d3imlay diyAudio Member Join Date: Sep 2004 Location: Ohio	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?

10th December 2006, 12:36 PM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	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. __________________ regards Andrew T.

11th December 2006, 07:24 AM	#4
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	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. __________________ regards Andrew T.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
balanced ouput to transformer	Raj1	Digital Source	4	7th August 2007 09:34 PM
hybrid amp,split ouput	blondfire	Solid State	3	1st March 2007 11:06 AM
LM4780 - ouput = 4.4v - PB! HELP!	aceditnanar	Chip Amps	6	3rd July 2006 04:10 PM
Ouput DC	lawka	Pass Labs	6	15th April 2005 04:31 AM


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

10th December 2006, 11:23 PM	#3
djk diyAudio Member Join Date: Feb 2001 Location: USA	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)

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read