Alpair 6 Bass Reflex Bookshelf - Page 2

EUVL · 21st May 2009, 04:39 AM

A brief update.

Patrick

italynstylion · 21st May 2009, 05:00 AM

Those look really sharp!

I'm working on something similar for the Alpair 6 as well. How did you mount your driver in the curved front face?

EUVL · 21st May 2009, 05:04 AM

Mill a counterbore on the front surface to suit the flange of the chassis, with a R8 fillet radius.

It does not show up very well on my photos because of the plywood pattern, but I hope it is clear enough to get the idea across.

Patrick

EUVL · 23rd May 2009, 05:21 AM

For German DIY fans :

There is an article reviewing a dozen of full range speakers in the latest issue of Hobby HiFi, where all 3 Alpair's were tested and higly regarded :

http://www.hobbyhifi.de/Aktuell/Aktu...e_ausgabe.html

Patrick

EUVL · 13th June 2009, 04:26 PM

An Interim Update.

Patrick

HareBrained · 13th June 2009, 10:56 PM

Some busy beaver is going to need his teeth sharpened.

Nice work.

norman bates · 13th June 2009, 11:58 PM

Euvl,
Can you loosely translate results?

The alpair 5 has 100mm frame, 27.5cm2, and 1.6g cone.
The round alpair 6 has 114mm frame, 38cm2, and 2.93 g cone.
The rect alpair 6 has 92mm frame, 38cm2, and 2.93g cone.

I'd be interested in multiple alpair 5's..............

Norman

EUVL · 14th June 2009, 06:19 AM

I have only experience with the 6, not the 5 & the 10. So difficult to comment on differences. Perhaps Henkjan can.

As to results, we are still hoping to publish measurements soon.
We found that our microphone is not well calibrated, and ordered a new one. Just need time.

But we did listen for 4 hours or so. Otherwise we won't be building so many in one go.

How did they sound ? The reference at that particular session was a pair of B&W CDM1 with Mundorf Crossovers (1:1 component values, but KP caps and foil air coils). European Speaker of the Year 1997, I believe. The Alpairs had much better clarity without being bright, and I did not find the small BR lacking in bass by any means. If you absolutely need to go down to 20Hz, then a subwoofer helps. But for music listening, I'd be happy to just use them as they are, without sub. The room was 8m x 5m, acoustically well damped. And we played loud, just to look for any deficiencies.

We still hope to fine tune a bit based on measurement results. But I think we are very close to optimum.

Patrick

norman bates · 14th June 2009, 08:15 AM

Can you compare the alpair 6 to other full range drivers ?

Norman

EUVL · 14th June 2009, 03:01 PM

The only Full Range we have built were the Brines FT1600 and a pair of mangers in open baffle. While the Brines have a somewhat fuller sound, as you would expect from a floor stander, there is just no match for clarity as well as mids and highs. The Alpairs have some magic, like the Jordan's.

The Mangers are something else. Either you love them, or you don't. And we have both in our DIY camp. Suffice to say that one of the stern supporters of Manger in our Group has ordered 8 Alpairs for his HT system. The Mangers are only for stereo then, at about 8 times the price per chassis.

But there are many here who have more experiences with Full Range chasses than we do. I think there is no shortage of comments on these nice little drivers at DIYA.

Patrick

BTW Mark (from Mark Audio) has kindly pointed out that the same housing will fit a CHR70 very well, with only minor adjustment to the pipe length necessary.

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21st May 2009, 05:00 AM	#12
italynstylion diyAudio Member Join Date: Feb 2009 Location: Dallas, Tx.	Those look really sharp! I'm working on something similar for the Alpair 6 as well. How did you mount your driver in the curved front face?

23rd May 2009, 05:21 AM	#14
EUVL diyAudio Member Join Date: Oct 2003	For German DIY fans : There is an article reviewing a dozen of full range speakers in the latest issue of Hobby HiFi, where all 3 Alpair's were tested and higly regarded : http://www.hobbyhifi.de/Aktuell/Aktu...e_ausgabe.html Patrick

13th June 2009, 10:56 PM	#16
HareBrained diyAudio Member Join Date: Mar 2009	Some busy beaver is going to need his teeth sharpened. Nice work.

13th June 2009, 11:58 PM	#17
norman bates diyAudio Member Join Date: Nov 2003 Location: iowa	Euvl, Can you loosely translate results? The alpair 5 has 100mm frame, 27.5cm2, and 1.6g cone. The round alpair 6 has 114mm frame, 38cm2, and 2.93 g cone. The rect alpair 6 has 92mm frame, 38cm2, and 2.93g cone. I'd be interested in multiple alpair 5's.............. Norman

14th June 2009, 06:19 AM	#18
EUVL diyAudio Member Join Date: Oct 2003	I have only experience with the 6, not the 5 & the 10. So difficult to comment on differences. Perhaps Henkjan can. As to results, we are still hoping to publish measurements soon. We found that our microphone is not well calibrated, and ordered a new one. Just need time. But we did listen for 4 hours or so. Otherwise we won't be building so many in one go. How did they sound ? The reference at that particular session was a pair of B&W CDM1 with Mundorf Crossovers (1:1 component values, but KP caps and foil air coils). European Speaker of the Year 1997, I believe. The Alpairs had much better clarity without being bright, and I did not find the small BR lacking in bass by any means. If you absolutely need to go down to 20Hz, then a subwoofer helps. But for music listening, I'd be happy to just use them as they are, without sub. The room was 8m x 5m, acoustically well damped. And we played loud, just to look for any deficiencies. We still hope to fine tune a bit based on measurement results. But I think we are very close to optimum. Patrick

14th June 2009, 08:15 AM	#19
norman bates diyAudio Member Join Date: Nov 2003 Location: iowa	Can you compare the alpair 6 to other full range drivers ? Norman

14th June 2009, 03:01 PM	#20
EUVL diyAudio Member Join Date: Oct 2003	The only Full Range we have built were the Brines FT1600 and a pair of mangers in open baffle. While the Brines have a somewhat fuller sound, as you would expect from a floor stander, there is just no match for clarity as well as mids and highs. The Alpairs have some magic, like the Jordan's. The Mangers are something else. Either you love them, or you don't. And we have both in our DIY camp. Suffice to say that one of the stern supporters of Manger in our Group has ordered 8 Alpairs for his HT system. The Mangers are only for stereo then, at about 8 times the price per chassis. But there are many here who have more experiences with Full Range chasses than we do. I think there is no shortage of comments on these nice little drivers at DIYA. Patrick BTW Mark (from Mark Audio) has kindly pointed out that the same housing will fit a CHR70 very well, with only minor adjustment to the pipe length necessary.

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