6 dB per Octave Passive Crossovers

[LowOhms]

Hi Old Guy,

Thanks for posting . Some comments :

You state : "20 is pretty big ie 500 Hz at 16 ohms."

I agree, and brought it up in my original post.

I was amazed that Larry Moore came to a 20 uF ( 500 Hz ) value by ear. It makes me want to do the determination myself. I wonder what he was hearing?? I would start with approximately what GM posted in 2003, ( on 511B horns with 515B woofers ), 2 mHY and 12 uF, which for 16 Ohms is 1250 Hz. I would tend to vary values around that start point.

"There are a few who advocate 6 db/octave, bear in mind it lowers power handling."


The few people who advocate 6 dB per octave are THE ONES I hope to hear from.


You, and many other people, would like to tell me otherwise ( than to use 6 dB ) in a good natured and well-meaning way. "Power handling" you mention is of NO concern when I use 1.3 Watt to 3 Watt audio amps.

OG, my 1.3 Watt SE amplifier is really about a 500 Watt power supply, with the audio amp gated to 1.3 watts. The amp's custom power transformer weighs 18 pounds, and the DCR of the power transformer and two supply chokes has less than 15 Ohms of series resistances. See my moniker, ... LowOhms.

"But best is still active crossovers and separate amps. Just my 2 cents."

Not me. no thanks !! I have NO interest in biamping or using things like active equalizers. I have been there, done that, reject it fully now. I owned two-way horn systems previously, RCA Ubangies ( two 15s) and RCA MI-1428B field coil tweeters on RCA 90 by 40 horns, biamped. Drove me crazy. I can hear the timing differences and signatures of two different amps, on the system. Each different circuit has a different time constant through the amp. No, not for me.

IF ( and "if" is a big word ) I biamped , I would ONLY use exactly the same amps and exactly the same speaker wire and wire lengths, so that the music came to me as one, a similar time constant through the electronics.

However, as soon as you biamp, you need to add an extra active amplification stage for the biamp crossover, and the system loses transparency and information ( if its a good one), just like it does when you plug an active equalizer into a great audio systrem. Not for me, thank you !! Extra interconnect wires, extra stages, all add up to LESS IF you have GREAT basic electronics and and a GREAT front end. JMHO. YMMV.

Heck, ideal may possibly be NO inductor on the woofer, as Larry Moore suggested and GM mentioned. Maybe I need to try that, on the 515B and on a wider band width 416-8B.

I try to respect all people, and I hope we will tolerate diversity of opinion. " 6 dB ers ", I think you are out there. Lets hear your experiences, comments, please. Thanks.

Jeff