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I haven't posted here before, but I have acquired an SET amp (ASL AQ-1005DT) and need some advice with optimizing the way to connect it with the preamp and subwoofer. I am willing to DIY, even change the amp a little.
I've got two problems: 1) the subwoofer loads up the amp and changes its sound too much when connected (using either line-in or high-level in), and 2) the preamp gain is too high
Can I make or buy a box that takes the preamp input and splits it into two relatively isolated copies, one for the amp and the other for the sub line in? Then I could also attenuate the preamp output.
And could I make this a passive box by doing it all with transformers? The preamp output is transformer-coupled, so I like the idea of running balanced cables from the preamp to this box, which would then also be a balanced-to-single-ended converter and splitter. I've been looking at the SILK transformers, and it almost seems like this is feasible.
The input circuit of the amp could not be simpler: from the connector right to the gates of a 6SN7, with 100K to ground. As for the subwoofer, the inputs go to some kind of proprietary summing L+R network (it's a mono sub setup), details of which are not disclosed by the manufacturer. So I definitely want to isolate them.
May I ask this forum for any advice on this?
Perhaps a simpler solution; drive the plate amp from the speaker outputs into the low level inputs through a 2K (or so, adjust to get the sensitivity right) resistor. Since the input impedance of the low level inputs is probably in the 20-100K range it will have very little effect on the impedance seen by the amplifier, plus the sub gets the same signal as the speakers for greater coherence.
Brian
Take control! DIY.
Hello Brian, thanks for your response. I want to make sure I understand: There are plus and minus speaker outputs for each channel. You are suggesting to connect each speaker minus terminal to the respective line in ground, and to connect the plus speaker output to a 2K (or so) resistor, and connect the other side of that resistor to the "hot" line in signal?
Then this would connect the minus side of each speaker output together, tieing together the minus sides of the two ouput transformers. I think right now the minus speakers outputs are not tied to chassis ground (but I'll check). Does your advice still hold for speaker outputs that are floating w.r.t to each other?
-steverw
Like this: amplifier speaker outs> > > to bi-wire cable with a 2K in series with +> > > RCA input on the plate amp. One each of above for right and left channel since your plate amp already has one each L/R RCA input as does the summing internally.
Brian
Take control! DIY.
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