Squawker Driver Tests, K-55V, K-55M, K-51V, K-52H

[LousyTourist]

Bob, thanks for the bump. People I havent' read from or thought about in years here.

I had an annoying 9khz bump inroom, I added the P trap but I didn't seem to hear any difference. I am now fairly convinced it is due to the cement floors and walls in the room.

I replaced the stock AA's with your model A network, and that was a big help. Also replaced the tweeter although I didn't notice any particular improvement there. Probably my 57 year old ears more than anything else.

I'm also not sure about people obsessing over how flat the response is. My in room response is +-5db from 50Hz to 20khz. I think that is pretty darn good. With an acoustic suspension subwoofer I get down to 25Hz within -5db

[John Warren]

I've developed a couple of nets for my own Klipschorns (when I owned them) to modify the PD5VH_K401 magnitude response. By improving the linear part of the MID, more is now required of the HF unit and that places significant strain on the little T35. You can certainly filter out the garbage pit above 3kHz, it's trivial, but how to do it without leaving a large hole in the response?

[drboar]

I could measure the effect of a filter trap using such simple tools as a XTZ Room Analyzer II both on a Goodman Axiette Fullrange driver and a dome tweeter, so qith any decent setup this should show up accoustically not only electrically.

[LarryC]

I agree that those peaks are a problem. It's a shame that both the Type "A" and "AA" crossovers allow the squawker to "come back on" at such a volume. A crossover with a sharp cutoff slope between the squawker and the tweeter (or even a cutoff slope at all) would solve that problem.

I was told that the AK-4 has a 36 dB/octave slope at the upper (4500, I believe) xover point. It's supposed to be 12 dB/octave at the lower xover point. Sorry, I don't know whether these were the upper or lower slopes or both.