Hi,
see here:
https://1drv.ms/b/s!AnKX4vLSHn4Nh5ty6YD-Ge9iJbJ8qA
maybe ist interesting for you. 8 channel x-over and DSP with one AVR.
regards
Guenter
see here:
https://1drv.ms/b/s!AnKX4vLSHn4Nh5ty6YD-Ge9iJbJ8qA
maybe ist interesting for you. 8 channel x-over and DSP with one AVR.
regards
Guenter
Gluca,
I share your interest in using chokes in a passive line level crossover.
I got a pair of chokes from Dave Slagle for a 500 hz low pass - he recommended using 20k as the load so my chokes are 6.25 henrys (can't see using "ies" to pluralize a name, my peculiarity).
The problem is getting them to not pick up noise. I could not get it to work, even in a steel box. Maybe this is a reason to use a lower resistance load? Dave thinks the 20K is a much easier load and of course he is right. But, could the larger choke be more susceptible to picking up noise? I have no idea.
I followed my LR filter with a complimentary buffer (2sk170/2sj74) since after the filter is a (Slagle) 1:5 autoformer to match levels - I do not want to use a potentiometer, especially on the high pass side - would rather preserve my gain without having to add a gain stage.
The matching autoformer works extremely well on its own. Maybe the combo is the problem though I thought the buffer between would eliminate any compatibility problems.
Have you tried a filter yet? Have you had any noise problems? I am not getting HF noise - the chokes are picking up junk in the hum range.
Must say I do not see the a great benefit in using chokes in the high pass - I am using a cap in conjunction with the amp's input impedance for that.
Have you put something together you can listen to?
I share your interest in using chokes in a passive line level crossover.
I got a pair of chokes from Dave Slagle for a 500 hz low pass - he recommended using 20k as the load so my chokes are 6.25 henrys (can't see using "ies" to pluralize a name, my peculiarity).
The problem is getting them to not pick up noise. I could not get it to work, even in a steel box. Maybe this is a reason to use a lower resistance load? Dave thinks the 20K is a much easier load and of course he is right. But, could the larger choke be more susceptible to picking up noise? I have no idea.
I followed my LR filter with a complimentary buffer (2sk170/2sj74) since after the filter is a (Slagle) 1:5 autoformer to match levels - I do not want to use a potentiometer, especially on the high pass side - would rather preserve my gain without having to add a gain stage.
The matching autoformer works extremely well on its own. Maybe the combo is the problem though I thought the buffer between would eliminate any compatibility problems.
Have you tried a filter yet? Have you had any noise problems? I am not getting HF noise - the chokes are picking up junk in the hum range.
Must say I do not see the a great benefit in using chokes in the high pass - I am using a cap in conjunction with the amp's input impedance for that.
Have you put something together you can listen to?
hey, i suspect your output autoformers are picking up noise as they should be in the 100H ballpark. i used ferrite core inductors in the past with success and no noise (150mH for a low impedance network). I made 2 or 3 LCR crossovers but I have none currently, they sounded really great to me.
I'd like to build something flexible but it is proving difficult without a buffer as different source impedances will move the cut off freqs arounds. the only options I am left with is the 6dB/oct constant impedance network which is immune (well, there will only be insertion loss but cut off frets will stay where planned). the other option is to use a buffer which I'd like to avoid.
I'd like to build something flexible but it is proving difficult without a buffer as different source impedances will move the cut off freqs arounds. the only options I am left with is the 6dB/oct constant impedance network which is immune (well, there will only be insertion loss but cut off frets will stay where planned). the other option is to use a buffer which I'd like to avoid.
That would seem to be the obvious place for noise but without the chokes preceding the buffer, all is silent. So if the autoformers are involved it is a disagreement between them and the choke which is strange considering there is a buffer between them. With the buffer out of the circuit it is silent, also, but with the buffer the range covered sounds better.
I tried the same buffer on the high pass side and it was not as good as without.
I am using a combination of speaker and line level first order filters for the high pass - my amps are input and output capacitor coupled so the caps are there anyway - might as well put them to use by sizing them accordingly.
For the low pass all sounds well enough with the choke in the speaker line but I know there would be better clarity with a little less confusion between the drivers if I could get a line level filter, too. Each driver has its own amplifier. I have found speaker level c/o components work much better with their own amplifier. Needless to say the components must be as good as you can find.
With the choke before the buffer something was going wrong, more than just the noise problem. There was much more loss than the dcR would have suggested.
Will keep trying ...
I tried the same buffer on the high pass side and it was not as good as without.
I am using a combination of speaker and line level first order filters for the high pass - my amps are input and output capacitor coupled so the caps are there anyway - might as well put them to use by sizing them accordingly.
For the low pass all sounds well enough with the choke in the speaker line but I know there would be better clarity with a little less confusion between the drivers if I could get a line level filter, too. Each driver has its own amplifier. I have found speaker level c/o components work much better with their own amplifier. Needless to say the components must be as good as you can find.
With the choke before the buffer something was going wrong, more than just the noise problem. There was much more loss than the dcR would have suggested.
Will keep trying ...
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