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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 3rd April 2013, 05:40 PM   #11
Sgrilli AD is offline Sgrilli AD  Brazil
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Wow ... I could not expect better answer ... directly from Mr. George!

Well, I'm sure the ways were shown.

I'll build the SSE with EDCOR I have on hand and see what happens. I will follow exactly what Mr. George recommends on part list and add a input selector switch, because I do not intend to use a preamp for now, only a phono preamp for my turntable. I´ll also play DVD and CD player.

I think it is better to make now a subwoofer output if I want to use it in the future. I really like to have this output in SSE, since I will not have a preamp now. If possible, I'd like Mr. George sent me a diagram showing how to make this output.

I'm sure many readers might enjoy these discussions and I appreciate the help.

Sgrilli AD
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Old 4th April 2013, 02:52 AM   #12
rknize is offline rknize  United States
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That is a loaded question, because it depends a great deal on what you are going to use for a subwoofer. Do you need a line-level cross over network? If you are just going to buy a typical powered subwoffer, they often already have the necessary low-pass filters. In that case you just think of the subwoofer as another power amp to drive and wire it accordingly. If you want to control the SSE and the subwoofer with the same volume control, that complicates things. You would needed some sort of line driver/buffer circuit to drive the cables and the SS amp that will power the sub. This is what your preamp would do for you.
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Old 4th April 2013, 03:31 AM   #13
scott17 is offline scott17
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If you have a powered subwoofer with only one input this very simple summing circuit may be of interest.

The output is taken from the collector of Q1.

Here is the reference thread: Simple subwoofer buffer/summer circuit
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