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In Reply to: RE: Passive high impedive filtering posted by pix on July 22, 2015 at 00:54:40
Seeing the cap after the 300b amp brings to mind a saying regarding active crossovers by the good Dr. Gizmo, "Doing it in the front is better than doing it in the rear." Now that's medical advice mind you.
Get you a Marchand analog active crossover. $500 for either a FET based active or a PPXLO. Having a two way makes the PPXLO an easy option for you.
Since you have the MiniDSP you probably played around with crossover points, but I would prefer 500hz over 600. I know your mid driver/horn can easily do it. I would even push it to 450hz just to try it.
You are doing great! Plenty of time to play with all this.
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Big speakers and little amps blew my mind!
Follow Ups:
Dr Gizmo? rip.
Owning similar speakers to him. I find that Active gives little advantage to a well designed Passive .. in real life.
He liked to Talk :-)
YMMV and all that, but a little advantage is more than none.
I'm sure you use a very low order slope, and yes passives excel at that. With multiple horns others might want the steeper slopes that are easier to do with an active. Don't take that too far. I have a passive that has something like a 110db slope, and with a flat impedence. It's about big enough to fill a car trunk. Yours is probably a two way, that makes a passive easier to do.
To me, slopes are all very specific to the speaker, and even to the listener. No one is right, and I go back and forth. Third and fourth order are my favorites. Now I'm talking too much!
> "He liked to Talk :-)"
People from NYC usually do. :)
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Big speakers and little amps blew my mind!
Dr. Gizmo knew whats right
As for x-over points,
So far I hve ony tryed 350 and 600Hz (passive) high-pass x-over.
And by those two I prefered the 600Hz.
So far I have only used 1st order filtering (6dB/Oct), And my guess is that going to low will requre a higher order of filtering?
He called a lot of things right a long time ago.
350hz is certainly too low for your mid driver, and first order only makes it worse. Gross distortion at moderately low volume I would think.
Hard to believe you've only tried two first order crossovers. Do you have the calibrated mic that goes with the minidsp? Considering you built your mid horn and your bass bin I would think it a necessity. You don't have to get fancy and take them outside. You can do it in the room. It will help to know if you need EQ.
Generally the lower you go the steeper the slope must be. It's always possible to figure in the acoustic roll off like you are doing. The Marchand I mentioned can go as high as a 48db eighth order slope. That's a crossover that's doing something.
You should be in a measuring mode right now. OTOH a 24db slope at 500hz would work fine as a start.
If you ever want a passive crossover, then I would say check out ALK's site first.
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Big speakers and little amps blew my mind!
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