DIY subsonic filter anyone?

BobM · 25th August 2003, 02:41 PM

Anyone construct a DIY subsonic filter to get rid of the woofer pumping action when playing vinyl? A few questionsI have on a project like this:

(1) I assume it might go between the preamp and the amp, and would therefore need fairly high grade components to be inaudible (but could it go in the phono preamp??? - a far better location for me)

(2) It would need a switch to be active or bypassed

(3) I don't have a clue on the components needed or a schematic for this

Thanks,
Bob

Keld · 25th August 2003, 03:23 PM

http://sound.westhost.com/project99.htm

sam9 · 25th August 2003, 04:36 PM

How about a 1 or 2uF film cap in series on the preamp or amp input. I recall some 70's gear that touted a "rumble filter" that was no more than that. You probably want to switch it out when paying CD's. If you can modify your preamp you could put only on the pono input, then you wouldn't need to switch it (unless your LP include some old Telarc's or Vigil Fox D2D's.)

jackinnj · 25th August 2003, 05:17 PM

here's the Analog Devices online filter design software -- just choose an F3 of 16Hz or so:
http://www.analog.com/Analog_Root/st...er/filter.html

jackinnj · 25th August 2003, 05:21 PM

and you get a nice magnitude/phase plot

25th August 2003, 02:41 PM	#1
BobM diyAudio Member Join Date: Apr 2003 Location: Long Island, New York	DIY subsonic filter anyone? Anyone construct a DIY subsonic filter to get rid of the woofer pumping action when playing vinyl? A few questionsI have on a project like this: (1) I assume it might go between the preamp and the amp, and would therefore need fairly high grade components to be inaudible (but could it go in the phono preamp??? - a far better location for me) (2) It would need a switch to be active or bypassed (3) I don't have a clue on the components needed or a schematic for this Thanks, Bob

25th August 2003, 05:17 PM	#4
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	link to ADI here's the Analog Devices online filter design software -- just choose an F3 of 16Hz or so: http://www.analog.com/Analog_Root/st...er/filter.html

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25th August 2003, 03:23 PM	#2
Keld diyAudio Member Join Date: Jan 2002 Location: Borås, Sweden, Tellus	http://sound.westhost.com/project99.htm

25th August 2003, 04:36 PM	#3
sam9 diyAudio Member Join Date: Jun 2002 Location: Left Coast	How about a 1 or 2uF film cap in series on the preamp or amp input. I recall some 70's gear that touted a "rumble filter" that was no more than that. You probably want to switch it out when paying CD's. If you can modify your preamp you could put only on the pono input, then you wouldn't need to switch it (unless your LP include some old Telarc's or Vigil Fox D2D's.)

25th August 2003, 05:21 PM	#5
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	and you get a nice magnitude/phase plot

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