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Old 17th July 2013, 10:45 PM   #31
toobhed is offline toobhed  United States
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Fedex just delivered the new MA10s. My builds are now backlogged with A12P and A10.3M pencils coming up. Still need to put finish Alegrias before starting these....getting psyched!
Mario
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Old 18th July 2013, 03:22 PM   #32
zman01 is offline zman01  Bangladesh
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Mario,

May the summer of multiple builds begin...

Keep us posted on your progress with pics, and once they are done do share with us listening impressions.

Have fun!

- Zia
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Old 18th July 2013, 04:04 PM   #33
toobhed is offline toobhed  United States
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Thanks for the positive vibes, Zia! Alegria's (along w/ Pass ACA) should be done my mid Aug and will post pics. Both pencils by the Autumn realistically.
Mario
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Old 18th July 2013, 06:34 PM   #34
chrisb is offline chrisb  Canada
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Quote:
Originally Posted by zman01 View Post
Mario,

May the summer of multiple builds begin...
Indeed, by this week's end I should have a pair of a FH-ish design (working name FH-XL) ready for each 10.3 and 10P ( essentially same topology but with some minor differences besides the obvious dimensional "scaling" (Scott & Dave just hate that), as well as the Pensil10.3, and if there's enough offcuts, Scott's little stand-mount BR.

Oh, and an ERT26 tweeter retro-fit into MJK's BLH design for the original Alpair10

and maybe final skinning of the A7.3/ dual woofer enclosure

as well as a totally non MA project that's been on the back burner for a while

& some other DIY stuff I can't remember

Quote:


Keep us posted on your progress with pics, and once they are done do share with us listening impressions.

Have fun!

- Zia
No pictures of the FH-XL until after we listen to them, but really you could just think of them as FH3 on growth hormones
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Old 18th July 2013, 07:27 PM   #35
mp9 is offline mp9  United States
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Probably a dumb question or more like wishful thinking but could the FH-XL (BLH), increase the drivers efficiency any or would the FH-XL's remain at spec sensitivity 89.6db/A10P?

Also is the design still optimally set up to be used with corner loading?
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Old 18th July 2013, 08:57 PM   #36
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The horn only affects the efficiency over the bandwigth it operates in. Less than 300 Hz in this case, so no, the nominal efficiency does not change.

dave
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Old 18th July 2013, 08:57 PM   #37
chrisb is offline chrisb  Canada
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Originally Posted by mp9 View Post
Probably a dumb question or more like wishful thinking but could the FH-XL (BLH), increase the drivers efficiency any or would the FH-XL's remain at spec sensitivity 89.6db/A10P?
This question is often asked, the short answer is -no a Back Loaded design does nothing to increase driver's efficiency- long answer by Dr Moose (something about gain below mass corner )

Quote:

Also is the design still optimally set up to be used with corner loading?
so far we've not found that any of Mark's drivers require the boundary reinforcement from which some well known higher sensitivity makes / models benefit

edit; looks like Dave be me to it,
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Old 18th July 2013, 09:34 PM   #38
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Would flush mounting these drivers affect their performance?

Thanks
PeterC.
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Old 18th July 2013, 10:20 PM   #39
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Would flush mounting these drivers affect their performance?
Due to the thick bezel, not flush mounting degrades performance.

dave
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Old 18th July 2013, 10:25 PM   #40
chrisb is offline chrisb  Canada
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If by Mark Audio drivers in general, and the Alpair 10s that are garnering much attention here of late, I think the designer has made it quite clear that they should be flush mounted.

It' probably more accurate to say that not flush mounting them would affect their performance deleteriously.

Due to the thick molded resin frames and cone/surround profiles, there is some creativity required to rebate the drivers, chamfer or otherwise relieve the rear side of through hole, and retain sufficient core of material for mounting hardware.

In the case of the 10.3 and 10P, without the extra bezel ring, the required depth of rebate is 10.5mm, leaving little more than 7mm (approx 1/4") when using a nominal 3/4" high quality plywood. With the bezel ring, it's an additional 1.3mm ( 11.8mm just under 1/2")

A lot of folks glue a small additional panel ( at least 6mm / 1/4") in the immediate area of the driver, and scallop the rear-side bevel to leave solid pads at the location of screws.
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