Dual opposed 18" Mal-X's (X2)

They now have a 37mm xmax?

Oh good, more xmech! Having 32mm xmax, but only 40mm xmech didn't leave much room for error. Now that it'll have 45mm xmech, that should help out.

What about selling off that SVC Mal-x and buying two DVC Malx's when they come out in a couple weeks?

Sounds like a killer. Really wanting to drive the wife crazy huh?

Warp:

I have a dual opposed Maelstrom. I think I started out with 8 cf. because that was suggested. When I talked to Kevin, he said it woudl benefit with being bigger(to go deeper), and that 12 would be good, and 16 cf. would be even better. I think I ended up at 14 or so. It's huge.

Just curious, is there something you are trying to get out of the dual opposed maels that your sealed aren't giving you now? Trying to get extra space and not lose output?

My driver and PRs will be in on Tuesday. If I like it enough I might just have to build another and will buy your SVC off ya to match this one

Impedance Plots and FR to follow...shortly.....but 11.5 cuft seems at first to offer the best output vs performance. What amp are you planning to use?

Hey Warp. how big are your current sealed Malx's?

Here's dual opp MalX's in 11.5 cuft each run with a single side of your 8200's considering the single 4ohm VC. Probobly no SSF needed either....It's a big box though at 30inch cube.

Attachment 143616

For s#*t and giggles here's a single Malx with two AE 18" PR's in a 24x24x30 box with 2kw power

Attachment 143620

Attachment 143621

It needs an SSF 12db/oct centered at 15hz but man.....that's a serious sub. The PR's mass loaded to 2300g each. Considering some room gain although i know your room is BIG that's nearly flat out to 14hz in reality. Adding a pair of PR's to all three of your sealed Malx's would be quite a shock.

P.S. i just went back through your build thread and even in your current boxes if they're 6cuft each.....still works better than sealed for an adde $250 per box for the PR's

Where the heck is a 15 year old boy gonna go?

Maybe he didn't raise his son alone for the first 3+ years only the last 15.

Someone is thinking outside the box!

Start cutting some wood Warp! It takes quite a bit.



But you end up with a very capable sub!

How do you move that sucker around? Sure is nice looking thought! Good Job!More details on the two smaller box subs please?

Looks like MFWs?

Thanks--the granite top comes off, which makes it barely moveable with two strong guys for short distances. I am moving it out of the theater when I get my other LMS done, and my niece's boyfriend is getting the nod to help(he's a 260 pound NCAA hammer throw guy).

Like Tack said, the other two are MFW-15's that I no longer own.

A stuffed 8 cubes is fine.

Bosso

Dual opposed drivers, "Submersive and Bosso like subs", highly rated. Why instead of opposed placed drivers on the box you can't do front mounted dual drive subs like the JL Gothom? I was going to do a PR18-2100 set-up in a
7-8cf with the AV15X sub but maybe is better a dual AV15X sub in the same size box fully stuffed? I need one "good" sub (only one space available for placement) to cover a big size room. Both set-ups within $50 of each other.
Having a big room means not much room gain which means the dual drive set-up would need eq. in the low bass to get a flat frequency response in the room, unlike the PR set-up, right?

I'm sure someone can post the computer software models but there is nothing to be gained by increasing the box size by 50%.

You'll gain 2dB below 30Hz and lose 1dB above 30Hz. The extra output below 30Hz still requires higher excursion. The sonic difference is inaudible, the size difference is another story altogether. I'd rather keep the box size manageable and dump another KW into it for transients, which, IMO, is one of the SQ requirements that's at the top of the list.

I use a Bassis or a modded Bassis. Sorry, I have no idea how the SMS works. Either way, I'd use a sub you have now with no EQ applied and do a close mic sweep with the mic 1/2" from the dust cap, on axis, and smooth the graph 1/1 on REW. I would then do a sweep with the mic at the LP with no smoothing.

Between the 2, you can plan what to do with signal shaping ahead of completion. I may be building exactly such a beast later this year.

What is the VC configuration for the M-X?

Bosso

Maybe Kevin Haskins will chime in here. I built mine to the size he suggested.

Front drive has some advantages, but it doesn't outweigh the advantages of dual opposed.

Stay tuned for a run down of the AV15H in the Raven thread (If JJ would be so kind as to get me my drivers. I may fly up there and lay up my own pair in his shop if he takes much longer )

I have done some prelims on the first pair I got. I'm holding off for the replacements before I say anything, but, it looks like it may be interesting info for some.

JJ is the PR king. He obviously had PR in mind when he designed the AV MKII series, but... well, we'll see soon enough.

Bosso

Warp,

You are still running an amp bridged on each driver right? Just adding the final 4th Mal-x to go with the 4th 8002 and reconfiguring the enclosures right? If that's the case you have so much power on tap that small changes in the sealed box size really won't matter much. My quick modeling shows that the 8002's can get the Mal-x's up past xmax <25hz even in a 3.5ft box. Just EQ up the low end a tad to compensate for the smaller box. Smaller box will be somewhat safer from over excursion. There is some data that suggests that the smaller box will have more distortion, ASD or otherwise, but how audible that will be with <30hz freq's and the SPL levels involved with 4 18's wanging away is up to debate. I'd say anywhere from 4ft to 5ft per driver should be good and adding a Bassis per Bosso might be worth a look.

You still running the HPF?