MTM Madness

[HIFY GUY]

Re: Mtm madness

Hey Wolf, thanks for dropping in.

I remember seeing your "Rock-n-Roll" MTM, maybe you can post that here?

[Wolf]

Re: Mtm madness

I don't know what project you are referring to.
Wolf

[HIFY GUY]

Re: MTM Madness

Oh I see now, it was by other designer:

http://web.archive.org/web/20071207183643/http://www.wadsnet.com/~dtenney/dayton_8MTM.htm

[HIFY GUY]

Re: MTM Madness

Finished these a while ago, waiting for new drivers.

Been switching back and forth with the "square" boxes vs. flares - I'm sold on the flare type.

(The bass goes lower, quite dramatic really)

A nice really nice combination would be the SB29 in the ply/flare box, that little button of a tweeter works very nicely also.

[Jay1]

Re: MTM Madness

It would be awesome if you could do a write up, and mini comparison of these designs whenever you get done.

[HIFY GUY]

Re: MTM Madness

I like them all, these Dayton tweeters sound better than I remember (white pair); but that said, maybe the woofers/caps etc, are broken in now.

I do think the 16ohm hook-up has some advantages, e.g. getting a nice punchy bass.

[HIFY GUY]

Re: MTM Madness

This is the best out of the 5 built, a little power hungry but compensated by bridging two amps.

Dayton RS28F-4ohm: heck of a tweeter; there's plenty on top, so hearing more detail than the comparable drivers.

There's an issue with the SF's at low levels, however, that is gone with the extra power.

[HIFY GUY]

Re: MTM Madness

Still making these....and wish I thought about this years ago.
Made 4 of these 5" woofer mtm's, all low budget projects; had a dozen of Peerless 5" woofers and several Vifa xt25 in storage/boxes.

Found specs on the old drivers and ran in WinISD; an advanced forum member designed the xo.

The pair on the left was a two day project, started with 16" mdf shelving board; one of the best, easiest products to work with. Hands down - much better than the dark color mdf.

The paint is two coats OIL, one primer (4 hr dry) and one top, which set overnight.

The bass here is simply 5 stars!!! And just what I was looking for. May look into other 5" woofers, mtm's of course ;)

[HIFY GUY]

Re: MTM Madness

Still making the mtm's - this is about 1/2 of them ;)
I guess some don't like the complications of a mtm, but I'm really liking what they have to offer.
I wouldn't recommend them unless you can get them up to ear level, or point/angle the bases to the listener.

[HIFY GUY]

Re: MTM Madness

Made some updates here......
A buddy came up with this -tried it/liked it.

Removed dust caps off the 6.5" 8 ohm SF woofers and made mdf phase plugs.
The dust caps came off pretty easy and saved them in case I want to put them back on (plug may bump cap, don't know)
Picked up 3" SS bolts at HD and bolted the plugs right thru magnet, made cork washers so no vibration/noise, etc.

Results - highly recommend this for SF's; as they have a deep voice coil, 7/8" of exposed alum. coil.
There is less breakup, which is noticeably better. Movie dialogue outstanding, the HT never sounded better!

SF's are surprising well built, with imbedded factory gaskets; now the midrange is clearer and think this is a way to take a low cost woofer ($29 each) and enhance it with a couple of hours of work.

*checked box tuning before & after - no change.

[Cranix]

Re: MTM Madness

I have to say great looking MTM's! Can you give some more info on the finishing process?
What kind of oil base paint? How do you apply it? I'm in the middle of a MTM build, going
piano black on them. Doing the flat raddle can spray with spray poly over it approach. First time
using this technique.

[HIFY GUY]

Re: MTM Madness

I really don't have much patient for sanding/painting - one day is about it.
Post 57 may only have 2 coats (one primer - one finish) some of them have 3 coats.
The ploy here is the MDF is going to move around, so get them looking pretty good, wait a year, re-sand and give them a final coat.

They still sell oil at box stores/hardware stores; look for oil base primers also, they are easy to find and don't cost a lot. I'll take oil primer over water base anyday! Mineral Spirits can be found for $7 a gal.

I have some old spay cup guns, nothing fancy. You'll need a compressor, but they are easy to find these days, maybe borrow one.
FYI: http://www.harborfreight.com/catalog...lt?q=spray+gun

No spay booth and work outside so I run the pressure up to 50psi, wide fan & spray fast, as soon as the surface is glossy wet - stop!
A fan nearby is also a good trick, keeps insects off, helps to dry obviously.

Make up a spin table with 2 boards/nails, etc. stay in one place, move piece instead.

[HIFY GUY]

Re: MTM Madness

So took a little break for a while but back at it.
This is a vertical Ansonica build, very, very quick but solid with plenty of reinforcing.
(36" high and 70 lbs each). Used the parallel xo.

Only had them up and running for a week or so, but enjoying them; highlights: lots of detail, imaging and extended low bass.

No paint, I'm not going out in the garage anytime soon.