GH, What did you think of the sound of the 2426? I think it is similar (in construction) to the 2425 (titanium diaphragm). The 902 is a very good driver for a two-way set-up, excellent quality high-end.

The networks are simple first-orders crossed at 500 and 6kHz. I previously had just a high-pass on the mid driver, letting it roll off naturally. Since I don't have the means to measure response, I had to guess at the roll-off (~10K seems to be the concensus). After tweaking the tweeter x-over point a bit, things sounded nice. I was curious how the tweeter would sound if brought in a bit lower though, so am now running a band pass on the mid, moved the x-over point to 6k. I think I need to listen a bit more (and finish the other network!) before evaluating, but it sounds more balanced.

I have a pair of JBL 2420's coming, so will be comparing them to the 2470's. I'll be selling one or the other (may end up being a coin toss to determine which I like better), so if you're interested, let me know.

I was looking at your testing for the 2426 and that is interesting. I've found the 902 to be really good out to almost 20khz but it drops around 850-500. I do love the 511b/902 sound. I'd love to try the 511B/902 with other combos as well. Not sure how I missed this thread. Very cool. Any news on that tractrix tweeter?

seti:

I was looking at your testing for the 2426 and that is interesting. I've found the 902 to be really good out to almost 20khz but it drops around 850-500. I do love the 511b/902 sound. I'd love to try the 511B/902 with other combos as well. Not sure how I missed this thread. Very cool. Any news on that tractrix tweeter?

If you like the 511/902 combo, you should hear it with a trachorn 

Blvdre:

 GH, What did you think of the sound of the 2426?

 Sorry, it took so long to get back to you, The 2426 sounds excellent, however needs to be attenuated, it is much hotter than the K-55 I am used to.

Thanks for the network info, I have tried simple network, and find when properly setup work fine.

Thanks, Dave

Here are some pics of the Fastrac Lascala with the round to square throat adaptersfor JBL. I got tired of waiting for the machine shop to get these done, so built the Jigs to do them myself.

These adapters are optional and and additional $35 per pair, not necessary for use with the K-55.

Adapter pic 2

Adapter pic 3

Adapter pic 4

incredible.

Nice work as usual

jc

 Adapter Pic 3 is really cool!

The machined aluminum adapters have arrived. These are drilled for JBL 3bolt and Altec 2 bolt drivers. $100 per pair plus shipping.

Update, I just finished 3 pairs of Fastrac Lascala horns, 1 pair has conventional matt black finish, the other 2 pairs are finished in Black glossy hammered finish. $325 per pair.

I still have a few pairs of K-55 adapters that I will include for no additional charge.

3 of the 5 original pairs of aluminum JBL and Altec adapters are spoken for, I have 2 pairs left, and 5 more sets on order.  $100 per pair plus $13 for priority mail shipping to CONUS.

My second set of aluminum adapters have arrive, for those who are waiting.

For a while now, I have been shipping horns all over the U.S. for about $25, today I shipped a set and cost $46.

I still have a few sets of K-55 adapters left, and 2 sets of aluminum adapters.

Found a solution to the shipping hike, if I package the horns individually instead of in pairs there won't be any additional dimentional charges.

Shipping will be around $30 for a pair of horns.