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Old 12th November 2006, 08:24 PM   #1
pekar is offline pekar  United States
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Default Delsol- inexpensive full range bookshelf.

Here's one I've been keeping under wraps, but it's time to share.

Use the Aura NS3-194-8E, on sale for $10.50 from Madisound.
http://www.madisound.com/cgi-bin/ind....9881&pid=1705
Ignore the fs, it does far better than the numbers indicate.
Especially in my box.

One half sheet of MDF (you might could squeeze it out of a quarter sheet, with no mistakes)
Some padding for the back wall ( felt or carpet pad)
2"dia PVC (you can play with the port size)
1/2"hardwood face, or use 1/2" MDF or birch ply if you have to, but it won't sound as good. Mine is maple.

I developed this for use with the t-amp, and have found it works very well with the higher powered amp6.
I present this as an experimental starting point, and welcome suggestions.

design goals were-
cheap,
simple,
audiophile sound,
no crossover, just a driver (mechanical mods only),
rock the party.

plans at -
http://www.flickr.com/photos/47642593@N00/295706737/

Just build 'em- I think you'll be glad you did.
Pekar
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Old 12th November 2006, 08:35 PM   #2
pekar is offline pekar  United States
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Bottom pic. These are prototypes, I have yet to make the pretty pair.
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Old 12th November 2006, 09:03 PM   #3
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Reminds me of the Hawaii 5.0 for the defunct RS40-1354. Nice work.
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Old 12th November 2006, 11:44 PM   #4
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Default question about the porting...

wondering if the pipe section can be replaced with a rectangular section of vent that runs up the inside of the back wall? You might even get away with just a slot in the bottom at the back edge. That way if you place a bottom on the cabinet you can stand mount the speaker and your vent still works. Is there a special interaction going on between the two vent sections in this design? As it stands the vent action will be modified depending on what kind of surface the speaker sits on (ie. smooth floor or carpeted). Comments? Regards Moray James.
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Old 13th November 2006, 12:34 AM   #5
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Location: Wisconsin....what did you expect?
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Memo to self:

Buy some of these.
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Old 13th November 2006, 01:20 AM   #6
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Nice little inexpensive project.

What sort of finish are you planning for the enclosure?
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Old 13th November 2006, 04:17 AM   #7
pekar is offline pekar  United States
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I intended that these be set on a hard surface like a desktop or bookshelf, not the floor. It would be easy enough to incorporate a bottom for other uses.

You can do whatever you want with the vent, but
I already tried the slot idea, with inferior results. Vents along walls are generally a bad idea.

I plan to use some birdseye maple for the face, with a painted body.

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Old 13th November 2006, 08:29 PM   #8
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Default system Q and subjective sound

Trying these same drivers in small sealed box, what volume and tuning freq are you using and are you happy with the sound? Ref my thread aurasound 3" I still think a TL is the solution but havenít gotten any feed back yet. And to james as long as you know then box tuning freq a rect port should be easy to calculate.
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Old 13th November 2006, 09:31 PM   #9
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Default Slot vents tend to...

provide
a broader BW in terms of load as compared to round or square ducts.
Seemed simpler to construct with all rectangular vents and I can see no advantage to switching to a round tube duct (in keeping with the design goal of ease of build). You could stretch this into two ducts and have a mini Onken design. This would also provide some internal cabinet reinforcment. Regards Moray James.
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Old 14th November 2006, 01:19 AM   #10
pekar is offline pekar  United States
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The attached pic. is similar to what I tried, and was unhappy with the result.

Your idea is interesting, reminds me of the Solo-103.

This box is really quite small, and with 3/4" walls needs no bracing, IMO.

Pekar
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