Adding an MBM (mid bass module) to your DIY Sound Group speakers - Page 3 - AVS Forum | Home Theater Discussions And Reviews
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post #61 of 259 Old 04-19-2015, 12:00 PM - Thread Starter
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Originally Posted by goonstopher View Post
Why are the mbms being made ported?

Aren't sealed just as good in these frequencies?
Just to get extension. Also reduces excursion at the bottom of the passband. Sealed is fine too, just takes a higher XO to the subs which one benefit of an MBM is to cross lower. So it depends.
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post #62 of 259 Old 04-19-2015, 01:31 PM
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post #63 of 259 Old 04-19-2015, 02:33 PM - Thread Starter
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Originally Posted by corradizo View Post
Could a passive crossover work with an mbm?
It's difficult and I'd need both the MBM and speaker for a while to develope it. Active is easy at these frequencies because they're flat and predictable. Impedance is a mess however. At higher frequencies impedance is a little more controlled but the FR is a mess so either active or passive needs close examination.
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post #64 of 259 Old 04-20-2015, 06:43 AM
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Quote:
Originally Posted by tuxedocivic View Post
It's difficult and I'd need both the MBM and speaker for a while to develope it. Active is easy at these frequencies because they're flat and predictable. Impedance is a mess however. At higher frequencies impedance is a little more controlled but the FR is a mess so either active or passive needs close examination.
Thanks. I was reading up on the Hsu mbm and it looks like the amp is designed to roll of at 50hz and the hpf is user adjustable. Going diy, I wonder how one would replicate that for minimal cost? Probably with a similar on board amp or maybe a pro amp like the inuke1kdsp...
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post #65 of 259 Old 04-20-2015, 07:12 AM
 
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Quote:
Originally Posted by corradizo View Post
Thanks. I was reading up on the Hsu mbm and it looks like the amp is designed to roll of at 50hz and the hpf is user adjustable. Going diy, I wonder how one would replicate that for minimal cost? Probably with a similar on board amp or maybe a pro amp like the inuke1kdsp...
An amp with GOOD DSP like the inuke DSP or the Crowns would be a great choice. The have user adjustable high and low pass filters that can be set independent on each channel- delay, EQ, and you can even set the order crossover and slope (example: 12db/octave BW, or 24db/octave LW etc). I would think simple affordable pro audio amps is the best way to attack powering up a MBM- you get everything you need in one place and it's pretty easy to use. The only thing you'd worry about is splitting the L and R signals to power both amps- but that can be done with a simple splice of cables, or a cheap Y adapter. Or use a MINIDSP to split the signal works too- and use multiple amps.
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post #66 of 259 Old 04-29-2015, 08:51 AM
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Originally Posted by DotJun View Post
Are there any other 18" contenders you would recommend for a small sealed box?
Peavey Low Rider 18 in sealed 3cuft is wicked and no EQ.

https://www.avsforum.com/forum/155-di...-18-mbm-2.html

Panasonic AE-8000, Carada BW 120", Paradigm Studio 40v3 x 2, Paradigm 690v4, Paradigm ADP 470v3 (rears), Micca M-8C x 4, Volt 6 x 2 (SR), SI DS4-18 in 12cuft X 2, Marantz 7702MKII, OPPO 103D, Emotiva XPA-3,

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post #67 of 259 Old 04-29-2015, 09:20 AM
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Any idea when/if the writeup for the dayton 10 and/or mystery 12 might be ready?
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post #68 of 259 Old 04-29-2015, 09:38 AM - Thread Starter
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Soon on the Dayton. It's built and ready for testing next week. It's going to be used in a PA application. Once I have the bugs worked out it'll be posted.
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post #69 of 259 Old 04-29-2015, 10:19 AM
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What are the T/S for the 12s that are excellent mid bass drivers? Response plots?
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post #70 of 259 Old 04-29-2015, 12:48 PM
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Quote:
Originally Posted by tuxedocivic View Post
Ya that one is on my list to add here. I played with the TS when you first got it and to be honest, it's the most MBM suited woofer I've ever modeled. Quite stellar. Depending on your driver price it could basically make any other choice senseless.
Tux,

If you have a chance to work up a box size and tuning, I'll design the enclosure and get some cut. I put one in an old ported car audio box that I had laying around just to try and it was pretty intense.

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post #71 of 259 Old 04-29-2015, 05:34 PM - Thread Starter
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I owe you a few things Erich! I've been out of town for a couple weeks and will be home this weekend. I can get on some things then.
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post #72 of 259 Old 05-12-2015, 08:33 PM - Thread Starter
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I've added info on the Dayton PA255-8. It does better than winisd predicts.
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post #73 of 259 Old 05-28-2015, 01:57 PM
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The Dayton PA255-8 says only 18L?

So about 1.25' cu for 2 of them?

Thats small?
I thought it noted needing a large box?
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post #74 of 259 Old 05-29-2015, 09:44 AM - Thread Starter
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That's a bit big for a sealed 10", but you're right. That's not bad. I'm gonna double check my dimensions to make sure I didn't make a mistake. I feel like my box was bigger than that...
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post #75 of 259 Old 05-31-2015, 07:54 AM
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Quote:
Originally Posted by tuxedocivic View Post
That's a bit big for a sealed 10", but you're right. That's not bad. I'm gonna double check my dimensions to make sure I didn't make a mistake. I feel like my box was bigger than that...
If a bigger box is used it should be fine right?

Also confused on what the settlings achieve ie why the pairings need to be done as directed.
I'm not doubting there is good reason but confused on what the reasons are.

Is it sensitivity in the crossover range?
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post #76 of 259 Old 05-31-2015, 11:57 AM - Thread Starter
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Yes, 18L or bigger should be fine. I haven't look at my box dimension yet to see if I messed up, but anything bigger than 18 should be fine. I think I might have been 22 in my test box.

The settings are to match sensitivity. I don't have detailed info on each kit so it's my best guess.
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post #77 of 259 Old 06-03-2015, 02:00 PM
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Aah then sounds good.

I actually moved my pure 10 out of the front and replaced them with reaction audio cx-10. Very close in SQ but different. Each has its merits with pure 10 winning in acoustic music (which hurts cause I do love that) and CX-10 winning in sound stage due to my rooms high ceilings and close seating.

At least I can understand the reasoning now and check if any adjustments are needed by first comparing the speaker sensitivities then actually measuring.
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post #78 of 259 Old 06-04-2015, 09:29 AM
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Goonstopher, when did you order the Fusion-10? I thought you had the Fusion-8.

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post #79 of 259 Old 07-31-2015, 07:39 AM
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i want a MTM 12"
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post #80 of 259 Old 07-31-2015, 11:06 AM
 
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Originally Posted by lemonslush View Post
i want a MTM 12"
Ryan actually designed one. @tuxedocivic

He called it the D2 and said when he finally finished it that it sounded better than the 1099.

But no kit, so no one built it. If you want it, he could give you the info to make it. I'd support you. Bring the XO over here if you want me to do them, or paypal him some cash and have him make them for you. The wood working is easy.
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post #81 of 259 Old 07-31-2015, 11:12 AM
 
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He had a thread somewhere too... but I lost it.
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post #82 of 259 Old 08-01-2015, 12:44 PM
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Are you talking about this one? https://www.avsforum.com/forum/155-di...r12-3070c.html
It's TMM 2.5-way. I think there may have been some consideration of MTM along the way, but it's not wired that way in the final version.
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post #83 of 259 Old 08-07-2015, 05:56 PM
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post #84 of 259 Old 08-14-2015, 10:28 PM
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Quick photo of the custom midbass monster. I think it's got a 110oz magnet and weighs about 25lbs.

This is also the woofer used in the Maximus-12.






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post #85 of 259 Old 08-15-2015, 12:06 AM
 
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Originally Posted by Erich H View Post
Quick photo of the custom midbass monster. I think it's got a 110oz magnet and weighs about 25lbs.

This is also the woofer used in the Maximus-12.






Sexy stuff. Planning on getting the site updated soon?
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post #86 of 259 Old 08-16-2015, 09:39 PM
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I was able to get the product page started for the new MBM-12 Midbass Module:

http://www.diysoundgroup.com/midbass-module.html


But I need some help figuring out what size most people will use. I can likely get two flat pack designs made up for these.

They need to be roughly 2.25cuft before subtracting ports, braces, etc. But they can be 2cuft without giving up too much.

It turns out that the Fusion-12 Tempest flat pack can work out just about perfectly at 26" tall and 14.5" wide. I would just need to design a brace change to allow for circular or slot ports.

Tux mentioned a 24" tall enclosure, so if you guys think that's the way we should go, I can do that instead, but 26" might be a bit better and not as deep.


Another option might be something like the current 2cuft subwoofer box. It's actually about 2.25cuft so it can be modified for a slot port module with some modifications. That's 19" tall, 16" wide, and 17" deep. So it could also be laid on it's side and only be 16" tall.


I can understand the need for the shorter boxier shape, and then a taller one to sit your mains on if needed. I'm just not sure exactly how tall the other one should be.


Oh, and I would consider making up dual models as well. They will work in ported enclosures all the way down to 1.25cuft, so duals wouldn't be too big. But 4 of these in a room would be way overkill.
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post #87 of 259 Old 08-16-2015, 10:14 PM
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Quote:
Originally Posted by Erich H View Post
I was able to get the product page started for the new MBM-12 Midbass Module:

http://www.diysoundgroup.com/midbass-module.html


But I need some help figuring out what size most people will use. I can likely get two flat pack designs made up for these.

They need to be roughly 2.25cuft before subtracting ports, braces, etc. But they can be 2cuft without giving up too much.

It turns out that the Fusion-12 Tempest flat pack can work out just about perfectly at 26" tall and 14.5" wide. I would just need to design a brace change to allow for circular or slot ports.

Tux mentioned a 24" tall enclosure, so if you guys think that's the way we should go, I can do that instead, but 26" might be a bit better and not as deep.


Another option might be something like the current 2cuft subwoofer box. It's actually about 2.25cuft so it can be modified for a slot port module with some modifications. That's 19" tall, 16" wide, and 17" deep. So it could also be laid on it's side and only be 16" tall.


I can understand the need for the shorter boxier shape, and then a taller one to sit your mains on if needed. I'm just not sure exactly how tall the other one should be.


Oh, and I would consider making up dual models as well. They will work in ported enclosures all the way down to 1.25cuft, so duals wouldn't be too big. But 4 of these in a room would be way overkill.
Hi Erich,

how's the MBM pair with Tempest? Have you tried to pair with Tempest? Will you introduce 15" or 18" version soon?

Last edited by WereWolf84; 08-16-2015 at 10:19 PM.
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post #88 of 259 Old 08-17-2015, 06:31 AM
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Any idea on the price range of the driver and cabinet combo ? My preference is for a taller narrower box.
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post #89 of 259 Old 08-17-2015, 02:16 PM
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Not sure on price yet, I have to look back at the info from Eminence. It's going to be tough to offer 'free shipping' with these because there's really not enough stuff in the kit to get at wholesale pricing to cover the guess on shipping costs. We'll see.

Werewolf84, I'm sure they would work good with the Tempest. There won't be a 15" or 18" midbass module any time soon because it really wouldn't be needed for midbass. I forget what Tux said a pair of these 12's would do, but pretty sure it's over 120db. Plus the cost of getting a decent number of 15's or 18's made up would be well over $20k for just one of those sizes.

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post #90 of 259 Old 08-19-2015, 06:36 PM - Thread Starter
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Two in parallel present a very easy load on an amp and will go to insane levels with a 40hz HPF. If there were a pair on each LCR (6 total) in a normal room you would destroy the 1099 kids or tweeter before you would make these even flinch. And I'm on the record describing how loud the 1099 can go. We're talking midrange SPL in the 125db range. Ouch.
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