DIY progress report

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#362
I know that this isn't at the top of your list, but tomorrow
I expect final sign-off on the J-Low project, which is a
Jordan JX92S driver in a back-loaded horn, and probably
better than you think.

Mr. Harrington will probably get it up on www.passdiy.com
before the end of the week.

Meanwhile, everything else inches forward....
 
#372
moe29 said:
how would a ~8 watt SOZ work with the JLow?
(M*G*D) = Miller Genuine Draft? :devilr:
Click to expand...
The answer is obviously yes, but having listened to the
Pirates of the Caribbean for 4 hours (Because Jill chose to
use it as the basis for interpretive dance, as only she can).
I have to say that I recommend something more along the
lines of 30 watts or so.

8 watts = string quartet. 40 watts = sexual exhaustion.

The Jordans can take it if you high pass them.

So can I.
 
#373
Nelson Pass, Sounds like an excellent project. That Jordan driver looks like a good foundation to start with--has a nice frequency response, and really isn't outrageously expensive, considering the alleged performance.

I was wondering what you think the sensitivity is, at the typical 1w/1m... Out of the box, the Jordan isn't all that efficient, so I'm curious how the horn loading helps out.
 
#374
Well, it isn't as efficient as I would like. The main problem
though is the excursion seen at low frequencies for such a
tiny piston, and the rear horn loading reduces that by
bumping up the bass about 10 dB. Then we apply a 100 Hz
single pole high pass filter. Suddenly you still have bottom end,
(again not as much as might like) but the cone has stopped
bouncing so much. Now you can turn it up. Also, the horn gives
it a more lively, dynamic character than the original, which I like.
 
#378
I don't know about the 204's , they might have great high end response. But the new 208's need some help on top. Fostex tends to recommend a single cap as a crossover wit the FT17 tweeter. I just thought a few days ago about how low the tweeter will influence things at 6dB per octave crossover slope. Pretty sobering.

Dick Olsher is going to try to whip this combo into shape for a new Basszilla. I'd bet on him rather than me to get it right 😉
 
#379
The cabinet design brings back fond memories of bass cabinets I have played through over the years. The old Ampeg V-4 used a bifurcated horn loaded with two Altec 15" drivers. Very smooth and creamy sounding. I also owned an Acoustic 371 (i.e. the 370 head and the 301 cabinet). That was, let's see, a Cerwin-Vega 18" driver, I think. Very forward in the mid-range. Lotsa big name bass players used one cabinet or the other. For my money, I'd take the Ampeg. Both were huge. Both had wheels tucked into the little cut under the back, bottom corner to make them easier to move. Both had handles across the top angle. Grab the handle, kick the bottom forward, and the cabinet fell back on the wheels, ready to roll. Otherwise, the wheels did not touch the floor.
Note that the Acoustic 301 cabinet was the one with the famous sticker on the back that read: DANGER! Sound pressure levels may exceed 120 dB within ten feet of this cabinet.
I always figured that one little sticker sold about ten thousand more cabinets, 'cause everyone who read it was immediately filled with the lust to own one.

Grey
 
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