OT - Officially getting into the audio business

**cradeldorf** · October 16th, 2013, 01:20 AM

once you get measurements it should be a lot easier coming up with a crossover.

**analog addict** · October 16th, 2013, 10:50 AM

Originally Posted by cradeldorf

once you get measurements it should be a lot easier coming up with a crossover.

Heh, You've never been around one Dennis J. Had. He's hooked up just the 802 and listened to it at his shop, and has a basic design in mind. I wouldn't be surprised if he gets it finalized on Sat with one or two sweeps of Pano's analyzer....

**cradeldorf** · October 18th, 2013, 03:08 AM

Originally Posted by analog addict

Heh, You've never been around one Dennis J. Had. He's hooked up just the 802 and listened to it at his shop, and has a basic design in mind. I wouldn't be surprised if he gets it finalized on Sat with one or two sweeps of Pano's analyzer....

No I haven't been around him but you make him sound like somebody I wish I was around.

**analog addict** · October 18th, 2013, 07:51 PM

Decided that if Pano was going to come over to Dennis' shop, might as well kill two birds with one stone. So.....

We threw these together out of some reject parts and spare scraps so that we could make some measurements on a set of prototype crossovers. Should be an interesting day....

**Altec Best** · October 18th, 2013, 11:30 PM

I sure would like to have a little time on that CNC router..Once you have a design laid out it should be able to spit out panels very quickly.. Nice Setup AA ! What brand CNC is that AA ? Looks like a 48" x 96" ?

**analog addict** · October 19th, 2013, 09:24 AM

My other partner is the Director for Development of ShopBot, essentially the CTO.

http://www.shopbottools.com/products.htm

And yes, it's an older full sized, capable of handling a 4' x 8' sheet of plywood. He also has a smaller one, also bought surplus from the company which is still sitting at the factory, waiting for us to find space in his garage....

**Altec Best** · October 19th, 2013, 11:39 AM

Those routers are Sweet...I have some room in my garage if you need it..

**Old Guy** · October 19th, 2013, 12:00 PM

Originally Posted by Altec Best

Those routers are Sweet...I have some room in my garage if you need it..

Beat me to it

**Panomaniac** · October 20th, 2013, 06:57 AM

Had a good time over there yesterday. Thanks to AA for inviting me. It's a 3 hour round trip, but well worth it. The cabinets are very, very nice. The guys have done a super job.
The MTMs were very smooth, very pleasant. Measure well, too. Then we hooked up the 604s. Oops! Both HF 'frams were fried. Dennis (with a little help from me) managed to solder back together the bunt leads. And they worked!

My prediction was "No Bass" for the 604 on the small open baffle. All it took was a battery click test to confirm that. But we plowed ahead, anyway. Dennis came up with a 1st try crossover that was not too far off. I did measurements, suggested possible problem areas and fixes - and Denis jumped right to it. After a few tries we had a darn good starting crossover - not easy with an Altec 604 on open baffle. The work speed was impressive. By the end of the afternoon, they were sounding pretty darn good. A very different presentation from the MTM OB. 604 much more dynamic, more precise, more "live" sounding. Of course some of that was a bump in the upper midrange we hadn't tamed (horn) but not all. You can't mistake that Altec sound.

Dennis didn't like those blue Urei horns, so pulled them off. I measured. Not bad. The tweeter doesn't go as low without them, but it kinda sounds better. Measured there was now a dip circa 2K without the horn. I' will post photos and graphs later today after work.

**analog addict** · October 20th, 2013, 11:21 AM

Enjoyed it Pano. Been too long. Anyway, as I expected, it didn't take Dennis long to get the 604's really close. I think he'll still tweak them a bit more, but I expect these to be minor changes. As Dennis tweaks, we'll be working on an attenuated horn via 3-D printer.....