Subwoofer out question.

G · 6th February 2008, 09:55 AM

Let's say that I want to build a integrated amplifier with 50K pots on the input. Let's also say that I wanted to control the volume of a subwoofer amp using the same 50K pots. Could I take the signal off of the wipers of the pots to the subwoofer amp in parallel with the grid of the input tube of the amplifier? I am using a Aragon A2D2 DAC and I believe that it can handle the load but I will soon be adding a turntable to my system so I guess I would need to make sure that the phono stage that I use would handle the load also. Does my question make sense?

SY · 6th February 2008, 11:28 AM

You'd probably want to buffer it. The takeoff point is high impedance and prone to noise pick-up. This is a perfect spot to use a FET-input opamp.

EC8010 · 6th February 2008, 05:28 PM

Or you could use a cathode follower if you didn't want to break the thermionic faith. I'd use a source follower.

6th February 2008, 09:55 AM	#1
G diyAudio Member Join Date: Apr 2002 Location: Belleville, IL.	Subwoofer out question. Let's say that I want to build a integrated amplifier with 50K pots on the input. Let's also say that I wanted to control the volume of a subwoofer amp using the same 50K pots. Could I take the signal off of the wipers of the pots to the subwoofer amp in parallel with the grid of the input tube of the amplifier? I am using a Aragon A2D2 DAC and I believe that it can handle the load but I will soon be adding a turntable to my system so I guess I would need to make sure that the phono stage that I use would handle the load also. Does my question make sense? __________________ Gavin

6th February 2008, 11:28 AM	#2
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	You'd probably want to buffer it. The takeoff point is high impedance and prone to noise pick-up. This is a perfect spot to use a FET-input opamp. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

6th February 2008, 05:28 PM	#3
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	Or you could use a cathode follower if you didn't want to break the thermionic faith. I'd use a source follower. __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

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