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SET Asylum Single Ended Triodes (SETs), the ultimate tube lovers dream. |
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SET Asylum Single Ended Triodes (SETs), the ultimate tube lovers dream. |
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In Reply to: Thanks Paul--Highpass Question? Re: Sure it's not your amp .... posted by Dr Deville on January 3, 2007 at 21:35:15:
Haha! Yes, I was referring to the "S.E.X.y Speaker" design which we've posted for anyone to use. We came up with that after we were unhappy with the ported box.I wanted to make this as easy as possible, thinking of customers who might have bought our cheapest amp, so I kept it simple. But I do believe an additional crossover would be an improvement. Here's the deal:
1) The original is a sealed box with fullrange drive; this makes a second order (12dB/octave) rolloff and the small box gives a Q in the range of 0.5 (Linkwitz/Riley) to 0.7 (Butterworth) depending on the amp's damping factor. This matches well with a second order (12dB/octave) powered "sub"woofer, such as the less expensive models from Parts Express. (I put "sub" in quotes because I am using them as woofers, and the smaller/cheaper ones don't go down to 20Hz... :^)
2) With an additional, external line level crossover, 12dB/octave, this same system would produce a fourth order (24dB/octave) acoustic crossover, which I expect to have significant further benefits. I've not been able to prototype this yet, but recent developments make it more practical and I expect to have something to listen to in the next few months. This becomes complicated because of the variety of subwoofers. Some are 12dB/octave and would need an external 12dB/octave filter. Some are actually 24dB/octave and need no additional filter. And some have a fixed 12dB filter (usualy in the 100Hz-200Hz range) plus another, variable 12dB filter. These are sold as "24dB/octave" but it's not easy to determine exactly how best to make them act like 24dB/octave L-R filters at a particular frequency. In some cases it's nearly impossible to determine what the device actually does in this respect. And with a 120Hz crossover, you really need to get it right - just playing with the controls is not likely to get you an optimum.
That's not to even address the idea of a separate sub crossover, used with a "normal" amp. Which I'd love to do - a handy way to use that solid-state boat anchor you gave up on when you discovered SET magic!
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Follow Ups
- Re: Thanks Paul--Highpass Question? Re: Sure it's not your amp .... - Paul Joppa 23:32:44 01/03/07 (7)
- Thanks Again Paul--Very Useful - Dr Deville 01:42:00 01/04/07 (6)
- FX120 and FE167 probably better... - Thomas Martens 16:36:22 01/04/07 (5)
- Hemp FR6.5 - RC Daniel 14:41:09 01/05/07 (0)
- Re: FX120 and FE167 probably better... - Paul Joppa 23:56:06 01/04/07 (0)
- We're Talking About the FE166E for Sealed Boxes and 94dB Efficiency - Dr Deville 21:38:20 01/04/07 (2)
- I hear you... - Thomas Martens 10:45:06 01/05/07 (1)
- Groovy--Please Share Your Review! - Dr Deville 13:43:31 01/05/07 (0)
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