Initial Impressions: Alpair 12 full-range driver by Mark Fenlon - Page 2 - diyAudio
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Old 8th November 2009, 05:53 AM   #11
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Martin,

Happy to have you here. I'm just looking for any alternative to coupe with my new 1858 Goldwood in H frame which is exactly as what I posted at your thread. I found a bit difficult for me to source the JX92s and the Alpair 12 can be obtained from local source here in Vancouver. I'll keep crossover the 1858 at 90-100hz and would try to start crossover the Alpair 12 from 150hz up. Please do advise.

Albert
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Old 8th November 2009, 11:43 AM   #12
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Albert,

I think the Alpair 12 could be substituted for the Jordan JX92S and used with the Goldwood H frame.
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Old 8th November 2009, 12:23 PM   #13
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Finally had chance to try to re-write some of my original impressions post on the A12. I'm somewhat limited at present due to family illness, and I haven't had chance to do as much with them as I would like. However, FWIW, a selection of general musings.

Physically the A12 is impressive when you get your hands on a pair. It's a very pretty driver (as far as such things can be -let's face it, they're not in the same league as, say, Zoe Tapper naked on a Maldives beach at sunset, but as drive-units go, they're up there with the best). They're weighty, and the build quality is excellent; the basket is the best example of the MA composite frame I've seen yet. Feels very solid, and the six screw-holes are centered on the basket, rather than being toward the outboard edge, which is useful. Where they really score is when you start looking at the finer details. The cone is quite remarkable; extremely thin / light, beautifully [multi]formed / pressed, and the glue-line of the dust-cap to the main cone is as tight as I've seen; Mark's production tolerances are very good through necessity. If they weren't, this thing wouldn't work. The suspension is also beautifully done. The ribs of the spider are of varying diameter, while the front suspension is extremely supple. Right on the edge I'd say. Connectors are solid & colour coded for ease of use; you'd have to try very hard to damage them.

In spec. terms, it's an interesting driver. The response shaping that Mark's done makes them very easy to listen to for extended periods -the midband dip will prevent any sibilance creeping in, while the gentle lift from ~3KHz - 8KHz ensures a decent sense of detail. Above 10KHz, the gradual roll-off to a -6dB at 20Khz keeps things smooth -v. useful with either digital sources or a modern phono-cartridge, 90% of which have a ruddy great peak in their HF output. Exceptionally wide operating BW; AFAIK, there are no other metal single cone, whizzerless drivers with this kind of extension. VC inductance is extremely low for a driver of this size -no surprise there given how high they go (or visa versa). The lift in the lower mids should go some way to countering step-loss, and there's plenty of linear travel to play with. Q & Vas are modest, total moving mass is very low given the size & materials, & raw motor strength is good. The infamous Γ=(B*L)/m acceleration factor comes out at a nominal (very respectable) 551.44m/s -arguably not something to be taken too heavily, but it does at least indicate reasonably little inertia in the power-train.

Sonically, I like them. I like the balance, I like the tonality and harmonic reproduction / decay. For me the overriding characteristic is stability; precise, very mechanical (in a positive way) feel. Detailing is excellent, several steps beyond the current A10 model. I'd concur with Bob's assessment of a low noise-floor; low level detail is very good indeed. Transient response is always an interesting question for FR drivers; by their very nature, they are wide BW designs, so transient response per se is always good, however, it's excellent in the A12. Dynamic response / handling is also very good, within the context of wide-band units. I tend to like car analogies; and what we have here is the 1988 McLaren MP4/4 of the FR driver world. It's about the package, rather than specific, stand-out features, and to my mind, it's very well judged indeed.
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Last edited by Scottmoose; 8th November 2009 at 12:47 PM.
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Old 12th November 2009, 06:52 AM   #14
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Hello,
The Alpair 12 is now available in Germany.
I think the Alpair is very inexpensive and will be very popular in the German DIY community.
Thanks to Mark for this wonderful driver !!!!!!!
Alpair drivers are very popular in Germany
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Old 18th November 2009, 06:24 PM   #15
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Quote:
Originally Posted by Scottmoose View Post
here is the 1988 McLaren MP4/4
..only race it did not win was the gp of italy, maybe this time will be a matter of local taxes and prices.
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Old 18th November 2009, 06:36 PM   #16
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Quote:
Originally Posted by Scottmoose View Post
I'm somewhat limited at present due to family illness, and I haven't had chance to do as much with them as I would like. However, FWIW, a selection of general musings.
Geez, Scott, what kind of eval do you do when you DO have the time? Thanks, and thanks for the possibility of yet another change of project. - Pat
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Old 19th November 2009, 12:01 PM   #17
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A proper one.
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Old 22nd November 2009, 08:31 PM   #18
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Can someone give a little insight on the quality of the highs of this driver. I am very happy with my current Alpair 10s, but considering upgrading to something bigger for extended bass response. It's the highs that worry me a bit though..
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Old 23rd November 2009, 01:03 AM   #19
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Originally Posted by super-panda View Post
Can someone give a little insight on the quality of the highs of this driver. I am very happy with my current Alpair 10s, but considering upgrading to something bigger for extended bass response. It's the highs that worry me a bit though..
Looking at the ALPAIR 12 Freq. Chart the Midbass(400Hz) is at the same dB level than the treble(8Khz), and between this the Mids looks very good.
I also wonder some impressions from who already listen this driver, but I believe the Hi will be good.
As you know the Alpair 10 Freq. Chart curve is a model to envy of perfection!
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Old 23rd November 2009, 02:16 AM   #20
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Hello super-panda,

From my experiences, the highs from the Alpair 12 surpass the Alpair 10 in quality, extension, size, and dynamics. The bass is tighter and with better control.

Bob
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