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Old 23rd May 2009, 10:19 PM   #1
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Default A non-traditional driver topology and thoughts

http://www.blackdahlia.com/samadhi/ichibanrel.htm

I first came across this design online several years ago. I thought it was interesting but I forgot about it till just recently.

http://www.6moons.com/audioreviews/fj/om.html

Until I read the review of this loudspeaker and it reminded me of the Ichiban. It got me thinking about a smaller design vs. some of the large OB speakers I had been thinking about, but retained the spacious open sound. The question was could it compete on some levels with an OB?

http://www.linkwitzlab.com/Pluto/photos.htm

Than I saw this and it confirmed that such a design could retain some of the sound qualities of an OB but in a smaller size.

So now the question of what drivers/crossover to use? All of these designs cross around 1khz-2.2khz. I want to keep it simple and try out a series 1st order. There are very few tweeters that can cross that low comfortably. I also looked at small full range drivers like the Fostex FF85K and thought about the out of production (but still available at Solen) Scanspeak D3806/8200. However I've always wanted to use the Morel MDT-33, now updated as the ET338. However I wanted to give it some headroom on the low end and I've read about adding a waveguide to a tweeter and then equalizing it back to flat so that the waveguide acts to reduce excursion on the low end of the tweeters range. Zingali does this too with their speakers. Now I wanted a good efficiency midbass to match, which is hard to find. PHL was a candidate along with a couple different pro style drivers. I wasn't satisfied with any of the Fostex drivers because of the low excursion. I loved the paper Seas drivers but wanted something more dynamic.

http://www.troelsgravesen.dk/JA8008.htm

Then I came across this design, seems he was thinking along the same lines I was, however I didn't care for his tweeter selection, though I'm sure it sounds great in his design, I wanted something that could cross much lower. However the morel is a close match to the Audax tweeter in efficiency.

So I could essentially use his cabinet design with the JA8008 midbass near the front facing up (firing almost perfectly in line with the closed section) With a Zingali style horn/waveguide Morel ET338 up front. Crossover frequency would require experimentation of course.

Now another question comes to mind. In all the designs with the upwards facing midbass is below the (official standard 39") listening height. The Ichiban is 35" high, the FJ OM is 28", the Pluto midbass is probably ~38". I wonder how much this is a factor? If I can ever build this I may need to experiment.
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