Alpair 6 Bass Reflex Bookshelf - diyAudio
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Old 16th May 2009, 01:19 AM   #1
EUVL is offline EUVL  Europe
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Default Alpair 6 Bass Reflex Bookshelf

This is only a preview.

My sister wanted a pair of new speakers. Have to be small, bookshelf, but enough SPL for small room (20 sq m). After some searching and consideration, I settled for a 6.5 litre bass reflex with the Alpair 6.

The pipe is 36mm ID and 103mm long (excluding the bellmouth). The form and construction is well known. No BSC, but a 4ohm 10W metal film in series, for now. Outside dimensions approximately 200mm x 276mm x 305mm. Walls lined with single layer of sonofil.

Here is the prototype unfinished (still need to sand and spray).

Absolutely gorgious thing (and not only the look). Thanks to MarkAudio for a great product. We are going to build 10 pairs of these.

We'll publish open-air measurement when we get a weekend without rain and with free time.


Patrick
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Old 16th May 2009, 01:31 AM   #2
dhenryp is online now dhenryp  United States
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Striking design!
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Old 16th May 2009, 04:48 AM   #3
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beautiful !!!!!!!!!!!!!!!!!
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Old 16th May 2009, 07:32 AM   #4
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It'll take us till July, or later, to be able to posted everything, including measurements and pictures of a full finished article (with custon design stands). In the meantime, pls bear with us.


Patrick

PS One thing we shall not publish is the drawing, to avoid us getting into trouble with a certain speaker manufacturer.




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Old 16th May 2009, 08:20 AM   #5
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A couple more pictures in the meantime.



PS :

The fringe patterns on the wood is of course not real, but an artifact of the JPEG compression as I have to reduce file size.
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Old 16th May 2009, 08:22 AM   #6
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Default Copy Milling Templates

2mm stainless steel, laser cut.
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Old 16th May 2009, 08:25 AM   #7
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Default Cut Out for Chassis

....
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Old 16th May 2009, 09:09 PM   #8
Henkjan is offline Henkjan  Netherlands
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very nice Patrick!

why the resistor?
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Old 16th May 2009, 11:08 PM   #9
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Quote:
Originally posted by Henkjan
very nice Patrick!

why the resistor?

They are 4 ohm drivers. Many tube amps would have a fit

Cheers!
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Old 17th May 2009, 02:04 AM   #10
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> why the resistor?

Very good question. To raise HF by some 4dB.

Partly determined from measurement (which was masked by too much room acoustics, hence the need to repeat outdoors). But we have also listened to different values from 2 to 5 ohms, and came back to 4 in the end.


Patrick
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