Hi Helmuth, maybe I've drawn it wrong or connected it wrong. I have to say it didn't seem to do all that much on these particular speakers, though my bottom end is superb (maybe it's doing something to help).
The answers are here: http://www.diyaudio.com/forums/full-range/130679-t-bass-drive-ob-lf-drivers.html
Basically the transformer is meant to give up to 6dB of gain at woofer resonance or thereabouts. It is also meant to be or at least sound more time-coherent than when using electronic or other EQ systems. Please see that thread, I don't understand it well enough to discuss it fully being honest. It reduces impedance at those frequencies so needs a strong solid state amp (works well with my modified 400WPC Carlsbro PA amp).
That schematic is actually out of date now as I'm using 3rd order on the woofers now, which gives (to the ears) a much more correct tone and deep lows. There's less confusion brought into the midrange by separating it more, and because the mid driver is so thoroughly coerced into performing properly (again, more filtering than shown now) it mates up perfectly to my ears. The dream of running it all 1st order fell apart as this system sounds so much better on steeper slopes, contrary to what I was expecting.
The answers are here: http://www.diyaudio.com/forums/full-range/130679-t-bass-drive-ob-lf-drivers.html
Basically the transformer is meant to give up to 6dB of gain at woofer resonance or thereabouts. It is also meant to be or at least sound more time-coherent than when using electronic or other EQ systems. Please see that thread, I don't understand it well enough to discuss it fully being honest. It reduces impedance at those frequencies so needs a strong solid state amp (works well with my modified 400WPC Carlsbro PA amp).
That schematic is actually out of date now as I'm using 3rd order on the woofers now, which gives (to the ears) a much more correct tone and deep lows. There's less confusion brought into the midrange by separating it more, and because the mid driver is so thoroughly coerced into performing properly (again, more filtering than shown now) it mates up perfectly to my ears. The dream of running it all 1st order fell apart as this system sounds so much better on steeper slopes, contrary to what I was expecting.
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With all the inductor losses I now have in the bass it's high time I went active on the mid-bass crossover. I'll look into sorting this out very soon.
It does also do that, gives a slight cut, which is meant to occur where the dipole peak is.
Simon
ps - currently measuring tweeter crossovers with the PROBABLY GOOD (non-broken) tweeter. The response is quite different to the "glued up" one - louder and with a peak at 2.5khz. Looking at a 2nd order filter to get it straightened up.
Simon
ps - currently measuring tweeter crossovers with the PROBABLY GOOD (non-broken) tweeter. The response is quite different to the "glued up" one - louder and with a peak at 2.5khz. Looking at a 2nd order filter to get it straightened up.
Hard to say, they both sound great right now! 😀
Need to listen and assess for a bit now, but it would appear that with 2nd order slopes on the tweeters it's not necessary to implement such a falling top end to avoid a shrill sound.
Need to listen and assess for a bit now, but it would appear that with 2nd order slopes on the tweeters it's not necessary to implement such a falling top end to avoid a shrill sound.
This system really does sound very sweet now. I have things just the way I like them: full, bassy, great tonal texture, detailed, no strong sibilant emphasis or bass overhang. Just beautiful music. It'll be interesting to see what a basic active crossover can bring to the party.
Hey Simon.
Just read this thread and wondered were your system is at now?
Still using the same rig?
Cheers
Dean
Just read this thread and wondered were your system is at now?
Still using the same rig?
Cheers
Dean
Hi Dean,
My speakers and system are exactly the same as when I last posted. I've been really busy recently and haven't had much chance to work on things. I would like to update soon as I really want to try inverting a bass driver and assessing any possible audible benefits this may have.
Simon
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