|
High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
|
|
|
High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
|
In Reply to: Re: old wizzer cone -neat Gary! - how bout xover approach? posted by freddy on September 2, 2001 at 12:35:40:
how did you make a "laid-back" xover? - was it "optimized"?? - what electical slopes did you employ?I think the thing that made the most difference was adding a resonant notch filter to the mid horn. The crossover point between the SP10 and the mid horn is at 1Khz. The horn has a wild free air resonance at 500 Hz. With the notch filter in place it killed a very noticable "honk" from the mid horn.
The slopes used are: woofer low pass 18db, mid high pass 18db, no high pass on mid- just natural rolloff, tweeter high pass 6db. The mid horn needed the steep crossover because it has an ugly low frequency rolloff. Starts to droop at 800 (it's rated frequency) then spikes back up at 500. The tweeter only needed gentle low frequency protection, it has a really nice and quite steep low frequency rolloff.
To match the effeiency of the horns to the woofer I used an autotransformer (we won't talk about what it's out of);-}. It is providing 9.5 db of attenuation. Also raises the impedance of the horns from about 6 ohms to someware near 30 ohms. I added a zobel across the input of the autoformer to flaten out the impedance of the system. Other than the doubble hump of the reflex box it stays pretty much at 16 ohms from about 250Hz all the way to 15Khz. Without the zobel on the autoformer it is 16 ohms to 1Khz where it jumps to 30 ohms. I'm using SE triodes to drive the system and liked the flat impedance better.
There is also a resonant peak filter on the tweeter. All the capasitors in the signal path are oil caps. Some plastic and electrolytics in the notch filters and zobels.
I have added lpads to the mid and tweeter since the schmatic was drawn. The speakers were setup and tuned in a rather small room. When I moved them out into my living room (which is more reflective) they were a little bright for my taste. The only optimization was listening.
Gary
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- Re: old wizzer cone -neat Gary! - how bout xover approach? - Gary P 09/2/0116:15:31 09/2/01 (1)
- Re: Gary - some neat pages ! - micing distance? - freddy 16:58:58 09/2/01 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2025, Audio Asylum, all rights reserved ]
