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Multi-Way Conventional loudspeakers with crossovers

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Old 18th October 2007, 12:06 PM   #1
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Default RMAF2007 Photos


First Watt (Nelson Pass design) OB Lowther. Bi-amplified with a 75 Hz active crossover between the 10" Scan-Speak woofers and the PM6A Lowther.
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Old 18th October 2007, 12:10 PM   #2
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Back of Emerald Physics OB Speaker. Not much to photograph since all of the front is covered in stretchy grill cloth except for the waveguide - and it's black too. They use stretchy grill cloth on the rear too, giving an interesting effect stretched over the two magnets of the 15" bass drivers.
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Old 18th October 2007, 12:12 PM   #3
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Cogent Field Coil all horn system. Note the 60's-vintage Ionovac tweeter on the right side of the bass horn.
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Old 18th October 2007, 12:15 PM   #4
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The Teres 75TL-based DHT transmitter-tube amplifier that powered the Cogent speakers in the RMAF ballroom. These 75TL designs are popular here in Colorado - I know two other folks using variations of this amplifier.
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Old 18th October 2007, 12:22 PM   #5
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Default The amp's a beaut!

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Old 18th October 2007, 12:22 PM   #6
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The power supply for Steve K's 75TL amplifier - he's one of the other Colorado hifi fans that built this transmitter-tube DHT amplifier. You can see why I'd rather photograph amplifiers instead of boring old loudspeakers.

Oh yes, it sounds good - very very good. I was listening to Steve's system on Tuesday, and it sounded better than anything at the show. Top quality throughout, and wonderful sound.
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Old 18th October 2007, 12:26 PM   #7
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Alexander of RAAL, coming all the way over from Serbia to visit us here in the States. Here he's in an animated conversation with John Atwood (next picture).
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Old 18th October 2007, 12:29 PM   #8
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John Atwood, co-founder of Vacuum Tube Valley magazine and blogmaster of the ClariSonus blog. Worth a visit, by the way - lots of good photos of John's recent trip to Thailand and Vietnam.
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Old 18th October 2007, 12:30 PM   #9
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Quote:
Originally posted by Lynn Olson
Alexander of RAAL, coming all the way over from Serbia to visit us here in the States.
We get him next.


__________________
And while they may not be as strong as apes, don't lock eyes with 'em, don't do it. Puts 'em on edge. They might go into berzerker mode; come at you like a whirling dervish, all fists and elbows.
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Old 18th October 2007, 01:00 PM   #10
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The AudioKinesis system, with front and rear-facing 11" TAD drivers, and front and rear-facing waveguides with Beyma CP380 compression drivers. The rear-facing HF driver has its own independent crossover (not shared with the front driver) - the rear crossover uses a highpass filter contour designed to minimize radiation from the rear diffracting around to the front.

In all the uproar about the Feastrex, I personally think the AudioKinesis is a better choice for those of us who like full-scale symphonic, choral, and rock music. Much more headroom, and superb tonal balance - a rarity at this year's show.
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