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Old 26th March 2009, 02:29 PM   #1
Norio is offline Norio  Japan
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Talking New Alpair5 speaker design from Japan

Hi, I am (Norio forum name) from Japan.
I have translated this text from Iizma, Alpair 5 user. He has sent his information and comment of his project to post in English.

Hi, I am Iizma from Japan. I have built a vented box for Alpair 5. I was surprised with its high level detail. Alpair 5 deliver excellent detail in whole range especially in high frequency area. Clear cymbals, high tone of acoustic guitars and dispersion of high note from trumpets, every component sounds beautiful! Detail in mid-low is also excellent. I can not feel any distortion; it's not matter of much or little, I could say actually nothing. Vocals sing so realistically that I can image the shape of the singer's mouth. Separation of vocals is also quite clear even under relatively laud accompaniments.
Not only in high & middle range, but also in low range Alpair 5 delivers high purity as if it has an independent woofer. Due to the response in the range of below 60 Hz, earth shaking bass cannot be expected. I'm writing this article listening to "Move" of Earl Klugh with relatively big volume. All in all, I can feel no distortion down to low-end range. The super detail is impressive. After a period of careful listening, the characteristics of the sound are extremely mellow. For example, when playing YMO, the outline of the sound is so clear that I can even image the waveforms, but it's not sticking.
It sounds really good. I would say it is outstanding among tiny full-range drives in the world, especially in view of sound detail, clarity in high range and delicacy. I really wonder if what speakers could generate such the detail. Furthermore, its low range maintains quite high resolution. The Gray sounds tighter than Gold. On this finally buildup condition, I barely feel a difference in their frequency responses but in the sound character.

The Gold sounds super due to its mellow and warm tone with maintaining fine detail. The Gray is outstanding with its tight and super fine detail. Itfs impossible to judge which is better, because it must totally depends on preference.

I have made measurement for gold and grey and comparison measurement.

Any way, the sound generated from Alpair 5 is really outstanding. I can say, the quality of Alpairs sound reaches the level that can only be achieved after spending many thousands YEN and considerable efforts in the market.

Alpair 5, truly awesome.

Iizma
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Old 26th March 2009, 05:34 PM   #2
supiken is offline supiken  Japan
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Hi. I am Iijima@supiken@Japan. the auther of this original article. Thanks for the great translation. I am very happy! By the way, one thing that concerned me, however, was the name of this model is actually "HDB". It's not big problem!
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Old 26th March 2009, 06:32 PM   #3
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A very pretty loudspeaker... are you going to post plans?

I have Alpair 5/6/10 and was hoping to be able to come up with boxes similar to the Fonkens i have done for the Fostex FE1x7 drivers.

dave
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Old 27th March 2009, 04:14 AM   #4
Norio is offline Norio  Japan
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To me it was the first comment into Diyaudio forum, but look! I already got a reply from Dave.

Yes, Ijima san said he is going to make a new "Hand made" enclosure for Alpair6, may be reported in near future.


This Url " http://blog.supiken.com/?m=20090304 " is the original site, If you have Japanese- english translator, you may enjoy (feel) the process how he built speakers.

Iijima san sorry I introduced wrong name.

Norio,
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Old 27th March 2009, 05:33 AM   #5
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Norio,

Your translation is better than Google's

I measured my drivers today and have a 1st pass on a box for the Alpair 10.

dave
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Old 27th March 2009, 09:18 AM   #6
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I'm not sure if I could be happy with the sound of one 3" driver.

I do like the lift in the highest octave to offset dispersion.

Here's the link to an alpair 5 crossing at 1khz to a sdx 7 (20uF cap on the alpair)
http://markaudio.com/alpair/5/sdx7combination

or these on page 3 of 8 page pdf (crossing at 300hz 6db)

http://www.grantfidelity.com/site/fi...ity_Report.pdf

here is the occam website kit (cabinet kit also)
1 assembled but no stain $300, $380 stained
http://www.occamaudio.com/kits.html

They're $60 each u.s. from css
http://www.creativesound.ca/details....el=ALPAIR5GREY

o.d. is 100mm or 4"

What's sd? 2.73k-mm2 ?
that'd be 27cm2, a little smaller than the one on a w3-871s (32cm2)

Could be the best 3" on the market................

Norman
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Old 27th March 2009, 02:49 PM   #7
Norio is offline Norio  Japan
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Dave san,

This translation is not by me, but by ..........Do not surprise!
The guy translated is Matsumoto san, use to be a Honda F1 engine engineer.

This is his English site he recently open,

http://lean-audio.blogspot.com/

Please enjoy Japanese audiofiles world.

Norio
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Old 27th March 2009, 02:54 PM   #8
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Quote:
Originally posted by norman bates
Could be the best 3" on the market................
I'll let you know how it compares to my current fave sometime after Chris gets bacj from the Carribean.

The new Audience (?) driver (xbl designed by Dan Wiggins) also has to be a contender.

dave
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Old 29th March 2009, 02:59 AM   #9
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I'm curious on the audience a3 driver, 6mm xmax, 12pp.

But it is 32cm2 (same as a w3-871s), I think the frame is 3"

this discourages me (dealer of the a3 driver).....
"I wasn't pleased with my first cabinet and the Sonic Barrier was way too much dampening for these drivers. It took away a lot of mids and bass. After a couple of cabinet modifications, I decided to 86 them and start over."
http://www.hometheatershack.com/foru...udspeaker.html

perhaps no baffle step and lack of bass support is his problem.
those 4 drivers in that box would have a midrange suckout and no bass............. horrible.

I think I'd want the grey cones (supposed to be more detailed).

I'm thinking there may be a huge future for the alpair line.

Jim Griffin on alpair 10
http://www.diyaudio.com/forums/showt...83#post1728983
"Well how does the Alpair 10 compare to the Jordan JX92S you may ask?...................The larger Xmax of the A10 yields a little lower bass and higher overall SPL versus the JX92S...........They apparently need less baffle step compensation. Bottom line is that given their relatively pricing, I would say that the A10 is an excellent value compared to the JX92S. The Alpairs sound is comparable enough to the Jordan so that most users will be able to achieve that single driver magic at a lower cost. ........So far I have only listened to the MLTLs during their break-in. I have them beside my 'Jordan JX92S with a Ribbon MLTL' so I have a reference for what I'm hearing."

alpair 10 in usa dollar = $129

Norman
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Old 30th March 2009, 08:25 AM   #10
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Hello, Ifm Matsumoto,
Thank you Norio-san for introducing my Blog site and me.

This comment is basically written as a response to Norman bates-sanf s comment (Post#6); gI'm not sure if I could be happy with the sound of one 3" driverh.

I have the similar feeling with Norman-san, especially regarding Alpair 5 (relatively high f0=136Hz). According to announcements from Mark Audio in its Internet site; gEasy to partner with Subs and larger driver, also good for single mini audio usesh, gThe total Q has also been raised to deliver a sharper LF fall-off for easier integration for those builders using sub-woofers.h;, thus Alpair 5 seems to be designed mainly as a super wide range tweeter.

Alpair 6 (f0=74Hz) could be more suitable for compact single full-range applications, whose diameter is only 1 cm larger than Alpair 5.

However, many Japanese builders love Alpair 5 so much. I assume most of them are using A5 as a full-range driver and solely love mid-high tones from it. Why?

Generally, Japanese have a tendency to prefer or accept more high frequency components comparing to European including North American. This clear tendency was found through studies in automobile industry area, which were performed by AVL List GmbH (Austria), I was also involved indirectly, to analyze preferences of car users regarding car interior sounds. A large number of listening tests were performed in Europe (mainly in German area), USA and Japan for the studies.
<references>
Franz K. Brandl, Werner Biermayer , A new tool for the onboard objective assessment of vehicle interior
noise quality, Proceedings of the 1999 SAE Noise and Vibration Conference, SAE 1999-01-1695
W. Biermayer, S. Thomann, and F. Brandl, A Software Tool for Noise Quality and Brand Sound
Development, Proceedings of the 2001 SAE Noise and Vibration Conference, SAE 2001-01-1573

This tendency might be able to attribute to a difference in traditional or racial living environment, i.e. people living in houses made of wood and paper (anechoic) versus people living in houses made of stones (echoic). The influence also can be seen in their traditional music structures. For example, I cannot accept Japanese traditional Noh-drama to be performed in normal concert hall that are basically designed for European based music. They are too echoic for Japanese traditional instruments especially for small flutes. "Noh" should be originally performed in open spaces highly integrated in nature circumstances.

On the other hand, European-based music, regardless of classical, Jazz or rock, is basically buit up on bass parts. I believe a certain level of bass performance (hopefully down to 30Hz flat) must be necessary for audio systems to satisfactory reproduce the fundamental structure of such the music, among them classical symphonies. Therefore I personally would never use Alpair 5 alone, but Ifm going to integrate the drivers to my desktop audio system with a compact subwoofer.

Finally I would like to add a comment about the Alpair 5 enclosures introduced above by Norio-san(Post#1) and designed/built by supiken-san(Iizima-san,Post#2). supiken-san is a professional speaker builder who is producing several full-range models. The enclosures designed by him are something special. Each model is very carefully optimized for specific driver unit by tuning the special inner structure. His speakers can be characterized by their flat response down to incredibly low-end. His Alpair-5 model actually delivers flat down to exactly 50 Hz that might be enough for pops or rocks. Unfortunately the inner structure is not disclosed (maybe a double bass-reflex type?).

Matsumoto
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