Subwoofer out from a TA2020 amp.

[Mayuri]

Hello everyone!

I have a TA2020 based amp which has 2 speaker outputs, one stereo in an power cable in (the ones in aluminum casing you find on ebay). But I also have a subwoofer with Hypex DS 1.2 amp, which only takes subwoofer signal from one RCA in.

How can I get subwoofer RCA-level stereo-to-mono signal from the amplifiers speaker outputs to the subwoofer?

Thanks in advance for the help,
Simo

[Minion]

I think it would be best to take the signal from the preamp into the Subamp not the speaker outputs ....

[Mayuri]

Already did it, the signal comes to a 100k stereo log pot center feet (ground is unconnected to the pot), leaves from the right feet to the stereo output and a summed output with 475 ohm resistors on both channels.

The ground leaves from the ground connector from stereo in (duh), and splits to the stereo out and to RCA (subout) with a 20k ohm resistor on the way.

The device only produces a loud buzzing sound from my sub, speakers work alright, expect the volume control is very clumsy. Overall it seems very... sub-par.

[Mayuri]

Well, how do I do such a device which splits a stereo line signal coming from the computer to a mono signal for the subwoofer and a stereo line signal for the amplifier?

[richie00boy]

Sounds like you have your pot wired wrong. The input signal should go to the top and bottom pins, ground being the bottom pin (the one that you get zero ohms when turned fully anti-clockwise and measure from middle pin to outer pin). The feed to the sub sound come from the ground pin and middle pin.