Alpair 6 Bass Reflex Bookshelf

EUVL · 16th May 2009, 01:19 AM

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

dhenryp · 16th May 2009, 01:31 AM

Striking design!

norman bates · 16th May 2009, 04:48 AM

beautiful !!!!!!!!!!!!!!!!!

EUVL · 16th May 2009, 07:32 AM

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.

EUVL · 16th May 2009, 08:20 AM

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.

EUVL · 16th May 2009, 08:22 AM

2mm stainless steel, laser cut.

EUVL · 16th May 2009, 08:25 AM

....

Henkjan · 16th May 2009, 09:09 PM

very nice Patrick!

why the resistor?

Geek · 16th May 2009, 11:08 PM

Quote:

Originally posted by Henkjan
very nice Patrick!

why the resistor?

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

Cheers!

EUVL · 17th May 2009, 02:04 AM

> 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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16th May 2009, 01:31 AM	#2
dhenryp diyAudio Member Join Date: Aug 2003 Location: Mass.	Striking design!

16th May 2009, 04:48 AM	#3
norman bates diyAudio Member Join Date: Nov 2003 Location: iowa	beautiful !!!!!!!!!!!!!!!!!

16th May 2009, 07:32 AM	#4
EUVL diyAudio Member Join Date: Oct 2003	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.

16th May 2009, 09:09 PM	#8
Henkjan diyAudio Member Join Date: Jan 2006 Location: Berkel en Rodenrijs	very nice Patrick! why the resistor?

17th May 2009, 02:04 AM	#10
EUVL diyAudio Member Join Date: Oct 2003	> 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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