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Old 29th March 2009, 11:55 PM   #1
MJK is offline MJK  United States
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Default Alpair 10 Measured T/S Parameters

I had a chance this afternoon to measure the T/S parameters of a new pair of Alpair 10 drivers that arrived on my doorstep this past week. The measured results came out very close to the manufacturer's specifications which is not typical of many of the more expensive full range drivers in my modest collection. The real significance of this result is that people, without the capability to make these types of measurements, can buy this driver and design an enclosure based on the spec sheet and be fairly confident that the result will work as predicted. No surprises for once.
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Old 30th March 2009, 12:00 AM   #2
ttan98 is offline ttan98  Australia
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Martin,

I am not familar with this full range, can you direct me to website where I can find more detail like price, a photo, etc., Thanks.
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Old 30th March 2009, 12:10 AM   #3
MJK is offline MJK  United States
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ttan98,

If you go to the manufacturer's web site

http://www.markaudio.com/

you will find info on the different drivers and the name of your local distributor.
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Old 30th March 2009, 12:10 AM   #4
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Default Alpair in Australia

Hi TTan98

go to www.darcheraudio.com.au to find pricing in Australia. I bought mine there and the price is very competitive and service is excellent For more info you can visit markaudio.com
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Old 30th March 2009, 02:14 AM   #5
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I really like the lift in the bass response on the alpair 10................

I would think if you could tolerate it, a 24" wide baffle would have a -3db at 190hz (theoretical, not this driver). Maybe with a 12" wide baffle, that would give response flat to 200hz without any baffle step circuit, even 3' from a wall.

norman
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Old 30th March 2009, 02:57 AM   #6
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Yes, no need for BSC with the bump That was the designers intention. He did however recommend a baffle of 185 to 195mm as the best width. I haven't tried them in OB but certainly worth a go
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Old 30th March 2009, 03:10 AM   #7
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MArtin,

Those are very close to the measurements i made. I came to the same conclusion re factory numbers.

An interesting aside is that given the measured JX92s parameters from the 1st Chinese batch that came as part of the diyA group buy, the Alpair 10 is a better match to the JX92 specs than the JX92 so makes a better drop in replacement for boxes designed for the JX92s.

dave
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Old 30th March 2009, 07:46 AM   #8
Henkjan is offline Henkjan  Netherlands
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Quote:
Originally posted by Antripodean
Yes, no need for BSC with the bump That was the designers intention. He did however recommend a baffle of 185 to 195mm as the best width. I haven't tried them in OB but certainly worth a go

check out these 2 designs, both without BSC:
Conical Horn with Markaudio Alpair10 FR
Mark Audio Alpair 10 MLTL Design
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Old 30th March 2009, 09:43 AM   #9
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I've got 2 pair of the entry-level CHR drivers coming to play with -I have a feeling that is going to be a real sleeper unit. I'll get them measured when they arrive, but thus far, Mark's published driver specs appear to be very close to the reality, which as Martin & Dave say, is seldom the case with most manufacturers, so big kudos to him on several levels. I'm increasingly viewing these units as picking up where the Jordan drivers leave off... the work / R&D that goes into them is something else.
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Old 30th March 2009, 01:45 PM   #10
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I didn't know about this manufacturer. Interesting, sexy looking stuff. The drivers look just like Jordan. Are they affiliated with Jordan?

I'm suspicious of the plots. I know it's handy to smooth them out but c'mon. Tang band and Fostex plots have been proved to be much smoother than they really are and I wonder if it is the case here too.
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