jwgorman

Are those Cornwall IIs? I acquired a pair of Cornwall IIs last year (circa 1986) and rebuilt the crossovers as a matter of maintenance. I found a solder joint that was pretty questionable, so I’m glad I did. I guess you could start troubleshooting and pull a lead from every driver except the squawker, and with a pink noise signal at a constant spl and an spl meter at s fixed close distance, see what you find. If you keep the variables as close to the same as possible and one squwaker is louder you can then troubleshoot further to see if it’s a diaphragm issue or a crossover issue. There are a lot of smart guys on this board who will probably chime in with a better test but that’s one way. Here are what my crossovers looked like after I rebuilt them

I’m a tweeter *****.

That’s beautiful!

Thanks for doing that! It saves me from hurting myself for science

Chris, is the distortion issue mitigated by say a second order filter on the AMT, crossed at say 3k? Every once in a blue moon I’ll briefly play music that loud.

I just checked the current spec sheets. Looks like the khorn and lascala use phenolic but the CWIII uses titanium mids/tweets.

As some of you know, I’m very sensitive to tweeters Even as an old guy who can’t hear much beyond 12k, for some reason an otherwise great speaker sounds bad to my ear if the tweeter is mediocre. I’m putting my Cornwalls back together from ESS experimentation and decided to try the Crites Titanium replacement diaphragms for the K79s in my CWII. Wow! They totally transformed my tweeters and made the sound very, very good. My original diaphragms measured fine but the Crites are so much more detailed and smooth at the same time. Don’t hesitate if you’re sitting on the fence.

That’s my thought too; not long enough.

Ah! Ok, combination of cell phone and old man eyes fooled me again:)

Is that expanding foam on the top?

This horn looks interesting as a potential candidate for a Cornscala experiment https://www.rcf.it/products/product-detail/-/journal_content/56_INSTANCE_2MT9qNpeXdu4/20195/292743 It would seem like the 5” depth would keep the voice coil of a CD more inline with the woofer VC.

It is a pretty amazing tweeter at an incredible price. Plus, if you look at the housing of the AMT, it’s sort of a horn. I say, touchdown!

It really is amazing how much a tweeter can be a game changer.

Yep that’s them! I’ve even had good luck just sticking a 8uf cap on the amts and disconnecting the stock tweets. It is simply amazing how much just replacing the stock tweeters with high quality tweeters totally transforms these speakers (just using them from 6k up)

Good to know. That explains a lot. Thanks Chris.

On another board I noticed people building with the ESS AMT and I saw an interesting raw measurement. Quite a peak at 5k-ish

I like that analysis.

If I could paint, I’d grab a black velvet canvas and paint Oscar Heil and Paul Klipsch shaking hands in front of the stairway to audio heaven.

Well. Maybe. I’m going to go passive. And, I already have the mids. Dang it. I’m trying to model bessel 2nd orders at 400 and 1500 and compare them to 300 and 1200. I mean, on paper, it looks good. But my cabinet maker can’t get to my project for another month. So I have plenty of sleepless nights ahead.

Chris, you can’t see this, but I am bowing deeply in respect and gratitude! So, thinking about a 2 way now! Man, this looks awesome.

For those keeping score at home, I preferred the Cornwalls oriented normally, woofer on the bottom in my tests last night. I am using the squwaker in mine though. Chris was suggesting the Cornwall as a two way, bypassing the horns and changing crossover points. Just FYI.

Hang on, Japanese SACD of Who’s Next is just right:)

]Man I think I found a sweet spot. Ok, I would never have considered flipping them over. First time I have ever run a MWT! Ha.

Thank you sir, I never would have thought to turn the Cornwalls upside down! And thanks for measuring them. I do enjoy them much more with a couple of feet between the AMT and the wall. I have contacted a cabinet maker to build a Cornwall with a M5N8 Faital Pro essentially where the tweeter is now on my stock Cornwalls. I will have enough room to accommodate an LTH142 (or similar large horn) if I do not like the experiment with the M5N8. Last weekend I actually ordered another pair of the ESS AMT1s. I really think this is a worthwhile experiment.

We used them for indoor shows for years. Heck yeah, they are awesome, musical subs! GLWS