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Old 5th March 2011, 01:50 PM   #1
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Default Alpair selection...

To all who frequent this section of the diyaudio forums and most certainly Mark... I recently finished building an Elekit TU-879S Stereo Tube Amplifier Kit. (Kits - HiFi Tube Amp) It's output is appx 8.5 watts @ 8ohms and can drive speakers 4-16 ohms. I am intrigued by the Mark Audio line of drivers (they are just beautiful) and had decided on the Alpair 10.2 installed in the Greg Monfort ML-TL cabinet (see attached) when it occurred to me that here is a group of people that know so much more than I do that I should seek your thoughts on this selection.

I listen to every music genre. My listening spaces will vary but generally the space will be from a 12' x 12' (3.6 meters x 3.6 meters) room up to a 15' x 20' (4.57 x 6 meters) room. I do like some volume when serious listening but not window rattling. I do like clear sound with defined bass but not thumpy. If that is helpful.

As I have not purchased anything for the speakers other than 3/4" (19mm) baltic birch plywood I am open to suggestions.

Thanks loads all, I am looking forward to your thoughts.

Scott R
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Last edited by naturallmystic; 5th March 2011 at 02:16 PM.
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Old 7th March 2011, 02:50 AM   #2
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Hi Scott R,
Apologies for my late reply, the Elekit looks very nice. Its also worth taking a look at the Alpair 7 in Pencil if your room size remains 12 X 12 for most of the time.

All said, the Alp10.2 is sweet on Tube amps. Consider the Pencil 10.2 if you have the room. I'll see if the other guys can add their comments.

Thanks

Mark.
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Old 7th March 2011, 04:09 AM   #3
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Looks a nice amplifier.

The 10.2 should work fine in Greg's ML-TL. Perhaps he'll chime in with any adjustments.

Any of a number of the boxes designed for the Alpairs should satisfy your musical criterion. Do the one you like the cosmetics of best.
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Old 7th March 2011, 05:18 PM   #4
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Hi Mark and Dave, Thank you both for your posts. I am most impressed with the kindness of members here and that manufacturers (Mark) take the time to talk with customers who ultimately don't really buy large quantities of product.

If I were to add some depth to Greg's ML-TL cabinet I could shorten it a bit while keeping the same interior volume, which appeals to me. As an example his design, is 6.5" wide x 4" deep interior dimensions giving a volume 1482 cubic inches . If I changed those to 6.5" x 6.5" but shortened the height to appx. 35.25" it would give a volume of 1489.3 cubic inches which is pretty close. How or would it affect the overall design, such as the vent, and how does one figure out speaker height? The ratio of speaker height to to overall height is 3.35, which if the dimentions are modified to 6.5 x 6.5 x 35.25 would put the speaker center at 10.5 inches from the top rather than the 17" in Greg's design.

The pensil designs are nice, simple, and no doubt great sounding, until I see the depth required on the pensil 10.2 cabinet and know that the size just wouldn't pass the spouse test.

If this is asking too much just let me know. I don't know enough to know how much effort goes into figuring this sort of thing out. Ultimately I am trying to have a less obtrusive speaker that still performs well throughout the frequency spectrum. Then again perhaps I should stick with Greg's original rather than reinventing the wheel.

Looking forward to hearing both your, and others, thoughts. Again my thanks.

Last edited by naturallmystic; 7th March 2011 at 05:26 PM. Reason: spelling
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Old 7th March 2011, 09:00 PM   #5
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If you changed the HxWxD dimensions of GM's cabinet without knowing exactly what you were doing, you will compromise the performance. Length in an MLTL is functional to box tuning, so at the very least, the vent dimensions would need to be recalculated. The driver position along the line is also critical to its proper functioning.
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Old 7th March 2011, 10:13 PM   #6
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Thanks for your input Scott, I figured my simplistic approach wouldn't pass muster. But it never hurts to ask. So I guess I either go Pensil or Greg's ML-TL cabinet.

Are you guys aware of any cabinets plans for the Alpair 10.2 other than the two we have been discussing I should consider before I start pushing wood through the saw? I am open to suggestions.

Also thank all three of you for your input and time to post. I am grateful.

Scott R
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Old 7th March 2011, 10:25 PM   #7
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In an ML-TL the critical dimensions are cross section & length. You can change neither without a complete redesign.

dave
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Old 7th March 2011, 10:44 PM   #8
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Quote:
Originally Posted by naturallmystic View Post
Are you guys aware of any cabinets plans for the Alpair 10.2 other than the two we have been discussing I should consider before I start pushing wood through the saw? I am open to suggestions.
A number of free BR. If you are willing to pay, the best boxes (IMHO, and i have to be considered biased) are from Scott or myself. Samhain, Silbury, Mar-Ken10.2 (email me). Some of these still have some beta work needed.

Scott's may exceed WAF size limits, mine need stands.

dave
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Old 7th May 2011, 01:28 PM   #9
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Following on, I've got the fullrange bug! Perhaps Dave, Mark, Scott or anyone else with broad MA experience can help me with my next project choice. Which Alpair/box?

I have some Alpair 6P's for nearfield listening in the office and they are great, exceeded expectation, but I find them a little unrefined in the HF in ultimate terms. I'd like to build something for my main system. My room is 30' x 18' x 9.5' and my primary system is CDPro-I2S-AyaDAC-passivepre-EL34PP strapped triode. Lynn's Ariels have been my main speaker until now, but the P13's surrounds have gone and with no replacement in sight I'm looking for something to replace them.

I don't listen loud but enjoy ALL sorts of music. Ideally I want a speaker to everything, but my priorities in rough order are

1.treble purity
2.neutral tonal balance
3.soundstage width and depth
4.micro dynamics (downward dynamic range)
5.bass extension
6.macro dynamics (upward dynamic range)

I have a feeling A7's wont have enough to command the room, and A10.2's may give away too much in treble purity, A12's? no idea really. So I'm relying on your good selves to advise. Thanks in advance,

Simon
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Old 7th May 2011, 04:06 PM   #10
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Quote:
Originally Posted by simon dart View Post
I don't listen loud but enjoy ALL sorts of music. Ideally I want a speaker to everything, but my priorities in rough order are

1.treble purity
2.neutral tonal balance
3.soundstage width and depth
4.micro dynamics (downward dynamic range)
5.bass extension
6.macro dynamics (upward dynamic range)

I have a feeling A7's wont have enough to command the room, and A10.2's may give away too much in treble purity, A12's? no idea really. So I'm relying on your good selves to advise. Thanks in advance,
Simon
I'd go with the 10.2, it'll give you a greater Band Width i.e. bass extension - treble then the A7 which will image better but i suspect the 10.2 will do nicely too.
If you're considering the A12, whats left of the current run is on sale at Madisound and Solen (prob others), however Mark is working on a new version which will most likely incorporate some of the advancements that went into making the A10.2 such a nice driver and perhaps then some.
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