Markaudio Alpair 10.3 OB with H-frame Eminence - diyAudio
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Old 12th August 2013, 12:52 AM   #1
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Default Markaudio Alpair 10.3 OB with H-frame Eminence

Just finished my OBs with the Alpair 10.3s. Largely based on a MJK design - 16 x 16 x 16 H-frames with Eminence Alpha 15a LF drivers and a U-frame, which houses the Alpair 10.3s.

Just starting my break-in period, but already they sound AWESOME. The u-frames are 3" deep and are resiliently mounted to the h-frames with rubber grommets.

Bi-amped with a MiniDSP doing the x-over. 150 Hz LR2 for the LF and 200 Hz LR4 for the HF. No other EQ right now, just a Nelson Pass 6 dB Q-of-2 peak filter @ 20 Hz for the H-frames.

After the break-in period I'll have to sort out the dipole peak, which should be ~375 Hz or so based on simulation in the Edge.

@Markaudio -- thank you so much for this driver! Really really good stuff.
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Old 12th August 2013, 04:55 AM   #2
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Looks great! I am looking forward to hearing some 10.3m and ps this weekend.

Kyle
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Old 12th August 2013, 02:04 PM   #3
StevenZ is online now StevenZ  United States
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Very nice!
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Old 12th August 2013, 02:11 PM   #4
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Thanks, I had lots of inspiration for the project!

Main design is thanks to MJK:
http://www.quarter-wave.com/Project08/Jordan.pdf

Adding the U-frame to the full-range was based on the "Open-Minded" PE 2011 winner:
Openminded--An Open Back Speaker Project

As well as the sunflower OB (just the top half):
https://sites.google.com/site/undefi...diy-sunflowers

I'm pretty happy with most of the design decisions -- If I had to do it again, I would have cut the baffle holes a bit different, I would not have used the outer plastic ring of the 10.3. This caused problems with not enough recess for my material, the need to use cleats on the back and having to use the non-supplied MA screws (my fault, but still on opportunity to improve, should I want to update the baffles.) Another option would be to make an oak outer baffle a la Brines to mount the MAs to. This is nit picky, but it is DIY and there are always opportunities to improve.
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Old 1st September 2013, 04:27 PM   #5
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Those look great!! I was thinking about something similar with the 10p, replacing the fe 103 with the alpair 10x should make the speaker more ROBUST! lol

Larry
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Old 5th September 2013, 12:25 AM   #6
nrg2009 is offline nrg2009  United States
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I look forward to the end result and more impressions/measurements.
Great project that may fit my basement room.
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Old 13th September 2013, 02:23 PM   #7
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Old 23rd October 2013, 02:46 PM   #8
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A quick update. Still breaking in the MAs so can't do real measurements yet, but I am enjoying the sound of the speakers quite a bit. I've since added a few components to my playback chain -- a pair of 300b monoblock amps and a Decware preamp. That was a big improvement right there. Right now I have the crossover of the MAs at 200 Hz LR 12 and 100 Hz LR 12 for the Alpha H-Frames.

They excel for playing Jazz LPs, or really any acoustic ensemble. The produce a nice sense of space. Instruments feel as though they are in the room with me. There is likely a dipole peak and rolloff that I could still EQ out for the full-ranges, and the H-frames can tend to sound a bit boomy at times. All-in-all I am happy with the build but may do additional tweaking to the MiniDSP settings in the coming weeks.

Here is how they look in the room:
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Old 27th October 2013, 07:40 AM   #9
jakja83 is offline jakja83  Norway
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Which miniDSP?
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Old 27th October 2013, 11:51 AM   #10
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Just the basic miniDSP model -- The 2x4 https://www.minidsp.com/products/min...ox/minidsp-2x4
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