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Multi-Way Conventional loudspeakers with crossovers

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Old 19th August 2010, 03:25 PM   #11
Pano is offline Pano  United States
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No comment from the OP. Was it a hit and run?
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Old 19th August 2010, 08:41 PM   #12
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I'll just hit and run with a vaguely relevant picture !
This is the first of a pair of 7 cu.ft Jensen cabs for Supravox 285GMF . Built according to the Jensen plans on the Supravox site . Nice 25mm birch-throughout ply ; marginally softer than aluminium .

Hope you like it !

MJ
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Old 19th August 2010, 10:48 PM   #13
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I like it! The Ultraflex (and its Onken descendants) is a cool design.
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Old 19th August 2010, 10:54 PM   #14
doorman is offline doorman  Canada
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The Onken (or Fonken in my case) is also a fun build--
Good hunting!
Don
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Old 20th August 2010, 02:49 AM   #15
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Default since someone asked...

My version:

A7x The "x" is for experimental/the unknown...

I did this for a friend & client... there are a number of tricks employed in the structural part of the construction. That short horn part on the box needs major stiffening and damping.

After doing this job, I'd say next time (there won't be a next time on this...) build from scratch, it's not as difficult a build as it may seem looking at the drawings... stock construction is variable depending on the vintage and can be pretty bad...

The design as shown is intended to work up to <300Hz and then go away rather quickly so the HF horn can come in... that's one of the trick parts... so the midbass horn really didn't help much... and actually got in the way.

I did not choose an Altec driver since I wanted the thing to go lower than a usual A7 cabinet.

It sounds very clean, cohesive and merges perfectly with the horns. Yes, they are in the intended orientation, in case you were wondering. And yes the A7x boxes can be standing up also, they are in his new listening room.

_-_-bear

Oh, I wouldn't want a stock A7 cabinet at all...
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Old 20th August 2010, 02:40 PM   #16
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Nice! I remember when you were working on those.

In that room, I can see why you turned the horns. What are those - 805?
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Old 20th August 2010, 02:42 PM   #17
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803, 300Hz...

I would run them vertical in all but the very very largest rooms... but that is my preference...

_-_-bear
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Old 20th August 2010, 02:48 PM   #18
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Thanks. Looking again at the size of the beasts, it's obvious.

I have a pair of 803s, too. I turned them up but liked them better horizontal. I might try the 1005s that way to hear how that works. My walls are wood shingle, so not very reflective.
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Old 20th August 2010, 03:05 PM   #19
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Heh, your walls are very reflective!!

You'd be surprised just how much - until you try the speakers outside, you will not know.

I do not like the 500Hz xover point at all. Ymmv.
The compression driver is critical.
The usual suspects are not on my short list, makes all the difference in the world. Imo, the 1003 are better still as are the 203 better than that... probably the right way to go is with a L'Clearch (sp?) or similar... run whatcha got?

I did not like the imaging (or lack of) with them in the horizontal position, which is why I say in a big room that would likely change...

_-_-bear
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Old 20th August 2010, 03:14 PM   #20
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Well, yes - reflective but not a flat surface. So I think of them more as diffusion than pure reflection.

I've run the 803 outside for long throw voice. We were testing at 500-600ft (150-180 meters). No problem at all. The pattern is pretty tight. Of course the 203 would be even better for that.
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