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In the Forum: Audio Discussions
In the Thread: The loudspeakers for a powerful SET

Post Subject: Now the Real Work BeginsPosted by Paul S on: 8/1/2010

OK, maybe I got too zealous with the notch filter for the Reps. I aimed to bring it down 6 dB at ~2.2k Hz, using .47 mH and 10 uF against 10 Ohms for the notch, with the Reps itself at 7 Ohms. Right now, drums are too backed off, there is no "hair" to speak of on bowed strings, and I am still waiting for "spiky" treble. I am debating whether to put some kind of clips on the notch filter so I can play with parallel resistors until I get a better sense of what's going on there. Needless to say, of all the parts I do have, I don't seem to have any small-value, 12 Watt Mills resistors...

Not to divide this up like a "reviewer", but HF sounds a little bit "detached" now. It may well be OK, once the upper-mids/lower treble are balanced out; hard to say against an apparent trough. Just now, I suspect that, if anything, I might have to raise the HF x/o a little; it sounds like a slight peak at the HF x/o, exagerated by the trough below.

Midrange soundfield is very clean, calm, relaxed and "extended". It easily "swallows" the LF, and it seems like just the clear, empty soundfield for the "spiky treble" to emerge from, once the "spikes" are there to be had.

Upper bass is indeed much better; I am pleased with the tone that the harder-working Audax is developing; however, BR is still BR. Of course, I would have to double the woofers to go with sealed...

A possible generic point of interest: The extended-range Audax is still not "source-able", at all. In fact, bass imaging is now by far the best I've ever had. Upright bass is now totally detached from the speakers, and it stands alone in the soundfield.

I'm trying to keep in mind that I've used many new parts for this experiment, including the long-unused Reps, and I've added new duties for the Audax and the Audaphon, so I don't want to get too hung-up on any of this too soon. Not to mention that I have to "break myself in" to the new sound, also.

I don't know why for sure, but what I hate worst about tuning is the emperical work (sweeps, etc.). Still, it must be done at some point -- unless I just luck into "success"(!)...

Paul S

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