MFW-15 Dual Opposed Build - Page 2

Love it - great budget build !!!!
Always a big fan of the dual opposed !!

Now - how do they sound in sealed ???

Nice job Wembley! I've been searching for drivers to use for a pretty much identical project: multiple sealed ~6 ft^3 enclosures, run off one ep4000, and around $1000 for drivers. Your project has definitely helped me and I think I'm going to order some of those drivers now.

Very Nice,

How did you wire them. I think they are 4 Ohms each, correct?

Those distortion numbers aren't far off from what NotNyt got with this 8 LMS 18s. There are obviously tons of variables such as room, treatments, placement, electronics etc. That is extraordinary for the money though. What are your room dims btw?

I'm very interested in your subjective comments.

What Am I missing here?

Two 4 ohms wired in parallel is 2 ohms, putting two 2 ohms in series is 4 ohms.

Should be series first, parallel second?

Throw in a couple of blurays and let us know what you think...

Just guessing at the naked FR, which isn't too hard to do with a sealed sub and looking at that vs the in-room response, you can estimate the THD savings when the sub is moved into the room.

I remember years back when I posted a similar comparo with the Tumult MKI at 6 Hz, going from approximately 85% to <10% THD and Ilkka told me there was something wrong with my measurement.

It's nice to see further confirmation in other's posted efforts, so thanks for the data (thanks as well to you, notnyt).

Bosso

Within probably +/-13mm the drivers behave quite well with useful excursion well beyond that. At high excursion the suspension gets a bit unhappy and will start to make noise/popping. Use enough drivers within those limits, and you're good to go. 4, 8 or 16 of these in 2.5-3.5 cu.ft. with appropriate EQ for the room and you're set. If you want to insure the best sound quality, before looking at the response at the listening position, take a single driver and smooth the near field response to a nice 2nd order profile appropriate for the room. DCX does a nice job for this and a MiniDSP would be another top choice, especially if they ever get around to adding a limiter function, although I know such talk is blasphemy to some around these parts.

As some of you know I picked up 230 of these for a group buy effort. I didn't list them anywhere just yet, but it is coming. So there will enough to go around.

If anyone has some good T/S specs on those maybe I'll pick up a dozen or two.

Hey, thanks for the specs, Wem.

Hmmm...hmmm!! These ARE very interesting drivers. Indeed. $80 a pop, eh? Oh crap.

Good deal! You can put me down for a couple.

The drivers were built by Eminence per my input for use in the ill-fated MFW-15. The suspension (spider) is the weak link of the driver, but kept within +/-20mm you shouldn't have any trouble. Sandbagger & I will have a modified SA-1000(rack version) able to drive 4 of these in 2.5-3 cu.ft. each making for a more plug and play option, but pro amps and some time to EQ and set up will make for a very high bang-for-buck solution, especially as the number of drivers goes up.

When I ordered 2 from gr-research today they said they have a few hundred left too.

I ordered 4 of them and looking forward to see what people are doing. I think this dual opposed has got me hooked, but I still have a lot to learn before starting the project.

How does this driver com pair to the Dayton 15" HF? They seem very close.

Closer moreso to the Dayton DVC15. The Reference series uses a lower distortion motor and has multiple shorting rings. This is definitely a budget wall buster. I like that!

This is an incredible bang-for-buck solution. I would say better than THT considering the extension gained.



Simply outstanding for only needing one amplifier to drive the whole set...reference to 10Hz with less than 5% THD. Run it at 6dB below and THD will fall to near nothing.

JSS

I keep kicking that around myself.

I was thinking 4 per enclosure, at least 2 cabs.
It should be bad ass. I mean the LMS is an amazing driver, but you can buy a ton of these for the price of one and spread 'em around.

^^^^^

DUDE! Are you reading my mind or what!?!? That's exactly what I was thinking of doing.

I'm thinking two or four cabs with four drivers per enclosure. One or two ep4k's. Daaayyyummmm!!!

Okay, that's it, I'm putting a limit of 4 per order! Nah just kidding. I've had 2 guys mention they might get 16 each, and one guy mentioned 10. That's crazy stuff.

I was hoping to sell them for $75 each, but I thought they should be double boxed for shipping protection. So the extra box with packing materials would put them closer to $77 each.

I opened up a FedEx account, and it looks like it saves about 15-20%, so that should help out. Might as well pass it on to the DIY guys. I wish it was more, and maybe it will get better as more items are shipped. The lady I spoke with said that many companies can save 30-40% on shipping pretty easy, but that most don't pass the savings to the customer. I've got no problems passing those savings on, so hopefully we'll get the higher discounts later.

Holy budget badassery batman!

Bravo wembley.........bravo.