Catching up...crossover and speaker designs...

**analog addict** · March 23rd, 2015, 10:42 AM

I've been wanting to get this part of the adventure posted here for quite awhile, but until now, I couldn't start new threads, at least new threads with links to photobucket pix. As previously posted, we, (we being myself Dennis Had and Panomaniac) had been playing around with a set of UREI 604-8Gs in an OB set up and a new custom crossover designed by Dennis and tweaked by both Pano and Dennis. Pano had gone back over to his shop on a later occasion when I was unable to attend, and had finished the up the mods on the crossover to his satisfaction. I finally pried the set up out of Dennis' hands and brought it back to the mancave....

Here is the finished crossover. Hopefully Pano can pull himself away from enjoying life in paradise and add his two cents worth, but these crossovers are the best I've heard on 604s....

Dennis has given me permission to make these part of the public domain, but there's no schematic, so if anyone is truly interested, I can reverse engineer these and post the schematic...

Moving right along, when Pano moved back to Hawaii, he sold me a pair of 416-8As. A few weeks ago, I realized I had the spare parts lying around to start a project that's been on the bucket list for awhile - Altec loaded corner horns, affectionately nicknamed Altecrats.

I have a set of BOTL EV Aristocrats lying around for a number of years, and I've always been intrigued by the idea of replacing the EV SP12B with real components. Additionally I have also been impressed with the sound that PWK could produce out of a corner horn with so - so drivers. After a few quick measurements to confirm that my spare parts would fit, this is what I came up with....

I'm using the crossover from the 604s which I was told crosses over in the 1300-1400Hz range. The horn goes down to 1250 per the spec sheet, so hopefully it's working as intended.

The sound? - Very similar to the 604s actually. A little less bright, with better/fuller/richer bass. That might be partially due to placement and enclosure design, but these aren't in a corner, yet seem to dig deeper. I'll bring these over to Dennis' shop next week and drop them off for some additional tuning, so we'll see where they wind up. They need some additional internal bracing, and better insulation material. I have the front frames set aside for when they are finished and the drivers are covered with some black speaker fabric I have reserved for just such an application. More later.....

**oface1** · March 23rd, 2015, 02:33 PM

I've been away for a while... Dang, Pano moved back to Hawaii? I loved his shop when I went up there!

NIce project there Analog! Look to seeing more!

**jdm** · March 23rd, 2015, 02:46 PM

I am interested in a schematic for the 604 crossover. I would like to try it with GPA 604-8H-II's.

**Jim Butler** · March 24th, 2015, 01:19 AM

I'd also like to know this schematic of the 604 crossover. Got some 604-8Gs I like to try it out on.

**Altec Best** · March 24th, 2015, 02:06 AM

Nice thread AA look forward to your posts. Thanks for sharing with us !

**analog addict** · March 24th, 2015, 09:04 AM

Originally Posted by Altec Best

Nice thread AA look forward to your posts. Thanks for sharing with us !

No worries AB. It's a minor amount of payback for all the help I've received over the years. I just wish I could get Dennis to borrow my A7s for awhile, but his shop is just too small.....

**Panomaniac** · March 25th, 2015, 03:34 AM

This was a fun project that turned out better than it had any right to. Not easy getting a balanced sound out of a low Q woofer coax on Open Baffle. Dennis did a great job with the crossover, I helped. Funny thing is, we designed it for use without the horn in the middle! And it worked.

I do not at all remember what we did, but I may be able to dig thru my docs and find something. Best that A-A just draw up a schematic with values.

Yes, I am back in old Hawai'i, where the dolphin plays and the palm trees sway. Here my man cave is an actual cave - a lava tube under the back yard that is about 24' wide by 75' long. Excellent acoustics. It's the humidor, wine cellar, music and party space all in one.

**Alien_Shore** · March 25th, 2015, 08:10 AM

Nice work, gents. I'd expect nothing less coming from you two.
And Pano, I'm pretty jealous of your new pad there - sounds like you've got quite the chill place.