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Bob Brines 18th April 2013 06:59 PM

M12-A12
 
1 Attachment(s)
My MLTL for the A12P is now finished. I will run them for a few days before I post measurements. At the moment they are a bit shouty. Possibly break-in, possibly a stuffing problem. Overall, a pretty good sound. Bass is there, but a bit weak. Again, break-in/stuffing. They will take quite a bit of bass boost. Then, the bass is prodigious. Well into the 30's. We'll see.

Bob

chrisb 18th April 2013 09:14 PM

Nice veneer work Bob

When broken in and with stuffing appropriate to the enclosure/alignment, I doubt you'll find them deficient of bass, but perhaps not as low as the 30s (I could be wrong) .

Both Jeff and Dave found them to take many hundreds of hours of break-in to fully open up, so you may need to adjust damping more than once.

And I'd be remiss in not suggesting they'd be happy with a nice tube rig (Jeff's is Pete Millet Engineer's amp, and Dave's is highly modified Dyna ST70)

planet10 18th April 2013 10:26 PM

Quote:

Originally Posted by chrisb (Post 3459820)
Dave's is highly modified Dyna ST70

It is really a whole different amp then ST70, but using ST70 iron & EL34 quartet

dave

Bob Brines 19th April 2013 02:01 AM

Quote:

Originally Posted by chrisb (Post 3459820)
Nice veneer work Bob

You will appreciate this: The sheet of veneer had booking lines 11" apart. The max cabinet panel width is 10". OK. Four sides can have the booking down the middle. Two of the adjacent cuts went on the front of both boxes and the other two of the left sides. If you look close at the visible left side, it matches the two fronts. The tops, of course, are cut from the strip immediately above the fronts, so the pattern flows uninterrupted up the front and over the top. The rest of the veneer sheet was not a bad match for the lower half, so the right sides and backs match.

It's great fun when the veneer matches the side of the boxes so well.

Bob

jimbro 19th April 2013 08:27 PM

Where's the signature contrasting (american) football baffle?

Scottmoose 19th April 2013 09:28 PM

Judging by the fractionally inset front baffle, I suspect in this case Bob has decided to employ a full-length grill to protect the drivers. Which if they're going to a show, as IIRC he was threatening, is probably a very wise move.

I quite like that look anyway -reminds me of 1970s Rogers gear. All I'd want is a quality receiver to go with it -a Sony V-FET model like the TA-F7B would do very nicely.

zman01 19th April 2013 09:52 PM

I have a beta build done too - obviously not as pretty looking as Bob's pair. :) Sounds good though.

Bob Brines 19th April 2013 10:46 PM

Quote:

Originally Posted by jimbro (Post 3461043)
Where's the signature contrasting (american) football baffle?

Well, more like a rugby ball or an Australian football.;)

The problem (cosmetics) with the MA drivers is the very wide frame. To do the oval supra-baffle requires a total baffle width 3" wider than the driver frame. There is a 3/4" round-over on the supra-baffle and a 3/4" on the baffle itself. Bottom line is that the speaker width would have gone from 10" to 12". That would have required reducing the depth from the already narrow 8" to 6". Then, the port would not fit with enough breathing room.

So. The cabinet is made for a full-length grill. No, I will not show the speakers with grills on. I am already doing the unthinkable by not using a tube amp. Having grills on would surely bring out the tar and feathers.

Bob

jimbro 20th April 2013 02:17 AM

Either way a beautiful job.

Scottmoose 20th April 2013 01:54 PM

No valves when showing wideband drivers Bob? A witch! To the river! :D

(No, I don't use them either. Well, not very often anyway)


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