AB-2 crossover info

[Mike 585]

I'm not savvy in electronics so I can't determine what's going on from the schematic. I searched the site and couldn't find complete details. Details found confirmed that the x-over points are about 500 and 4500 and that the slopes are steeper than the earlier first-order designs. What I'd like to know is what the slopes are and if it does roll off the mid-range or are the upper limits determined by horn like in the earlier A, AA designs.

Thanks for the help,

Mike

[Guest " "]

your AB-2 is 12db rolloff in the woofer section, 12db rolloff in the mid section with no bandpass so the horn sets the upper limit of the hipass and 18db rolloff in the tweeter section. the inductor and cap in series connected parallell to the tweeter does not effect the crossover point or the slopes.

[Mike 585]

Thanks for a quick reply Fritz.

Here's what sparked my curiosity. I have Crites A/4500s and CT-125s in my Belles, which I feel were a significant improvement over the un-updated AAs/K-77s that they came with. I got some AB-2s in a recent purchase of some Belle top parts that I made mainly to get the K-500s for use in building another set of Belles. Just for the heck of it, last weekend, I swapped out an A/4500 for an AB-2 (leaving in the CT-125) and rather than reach for adjectives, I'll say I was suprised that the combination has some qualities I prefer to the A/4500 - CT125 and thought it might be related to the steeper slopes cleaning things up a bit.

I've heard/read ALKs perspective but on the other hand I also read somewhere in the PWK Papers collection where Paul said they experimented with steeper slopes early-on but the result of the testing is that they decided to go with first order. It's all very interesting and an enjoyable journey up the learning and listening curve.