Designing a cabinet for Mark Audio Alpair 7.3 - Page 12 - diyAudio
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Old 27th February 2013, 11:38 PM   #111
chrisb is offline chrisb  Canada
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Quote:
Originally Posted by Studio Au View Post
I heard them last year. At a kef demo and last week again.

They were very impressive. Although not in my opinion worth anywhere near the money.
probably a more important question is whether they're known to be a serious production model (perhaps just custom / bespoke builds), or a technology statement piece with only a (few) traveling demo pair(s)

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The goal of both in emulating them was to use create a speaker with apparent single point source. Something the blade does very well. The use of twin drivers to cancel out vibration seems logical too.
something quite well documented by many DIY projects herein

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I is too short. When posting I noticed you can see the magnet. (Was made in 5 mins)

My thinking was to turn a come shape that would sit over the magnet like and omni deflector to bounce the sound into the larger cavity. Perhaps tapering the ends ala nautilus.
I've probably mentioned this in other threads, but after a couple of builds a few (5 or so) years back, I'd be concerned about very shallow enclosures in general, and most particularly with very lightweight cones, whether metal or paper.

Your quickie sketch appears to indicate a separate enclosure for the A7 that is tall and very shallow - I'd think a deep, perhaps tapered aperiodic enclosure might work better . Well, indeed I know conceptual drawings for something like that exist.
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Old 11th March 2013, 12:37 PM   #112
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One quick side related question...

Im building 4 pairs of Alpair 10.2's small BR cabinets for a bar.

Im trying to decide on how to power them (cost effectively) Doesn't have to be excessively loud. The easiest solution i can think of it using a 7.1 receiver, running on all channel stereo.

Then I thought that perhaps I can wire them together, run as a sort of line array with one good power amp?

Is this possible, would need 20ft of cable in between each speaker, could do 4 for the left channel and 4 for the right to shorten the overal length. Shall i put this idea away and focus on the multichannel approach?
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Old 19th March 2013, 11:40 AM   #113
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I made a small and very quickly turned mock up just to see what the rings of plywood, would look when turned. its about 1/3 scale.

Click the image to open in full size.\

Click the image to open in full size.
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Old 19th March 2013, 12:50 PM   #114
hajj is offline hajj  Lebanon
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They look like turned hardwood
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Old 1st April 2013, 03:24 PM   #115
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Still in need of 4x woofers for my project.

Any new suggestions? Ideally under 300
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Old 1st April 2013, 10:53 PM   #116
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what colour, type of loading etc

personally I like the 8" Dayton's (a little over that budget) 4 of these sealed perhaps

RSS210HF-4 - Dayton High Fidelity Subwoofer 8 inch - Europe Audio
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Old 3rd April 2013, 04:29 PM   #117
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Hi, they look very nice, a little rough but as you say its a proof of concept
me like them very much....

I will go with Delta 12 LF in 100L, a little EQ and I get them down to 30Hz with 50W of power, which in turn makes 116dB, too much to be honest... think about it

Danny
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Old 15th April 2013, 05:42 PM   #118
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Well? Update?
Waiting eagerly on results and first pics from build

Danny
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Old 15th April 2013, 07:36 PM   #119
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Still deciding on drivers.

Ive just moved to a new workshop, one guy renting a bench space from me has a CNC, so i'm revising the design to allow for this.
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Old 15th April 2013, 07:39 PM   #120
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Im keen to try and make these.

Invert the colours, Walnut case, and a ceramic baffle.

The horn shape can be made from the surplus from the teardrops.

Dovetailed solid walnut cabinet Ceramic baffle, Accuton ceramic drivers, good quality compression driver with tractrix profile. Could be very very good.

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