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-   -   MBM Explained ? (https://www.avsforum.com/forum/113-subwoofers-bass-transducers/3083498-mbm-explained.html)

kgveteran 08-09-2019 05:58 AM

MBM Explained ?
 
I read about MBM’s here and there, but integration seems vague.

Does the MBM have its own bandwidth, meaning...like a woofer in a 3way has its own bandwidth, or is it “added” to the existing bandwidth of the main speaker and have its own XO and amp.

Does this all mean your woofers in your mains have a dip thats filled in with an MBM

Id be interested in the integration process a little clearer

Alan P 08-09-2019 09:51 AM


sdurani 08-09-2019 10:46 AM

The idea behind MBMs is that the lower part of the bass range is better reproduced by large subwoofers pressurizing the room while the mid-bass is better reproduced by smaller/faster woofers (MBMs) placed nearfield. So, for example, if you cross over to your speakers at 80Hz, you connect the subwoofer output from your receiver to an external device that splits the bass below 80Hz into two parts: below, say, 50Hz goes to your big subs placed at room boundaries; above 50Hz goes to the MBM placed next to you. This helps to separately optimize low bass rumble and tight mid-bass punch (gunfire, explosions, drum whacks). Or so the theory goes. Integration means blending your low bass subs with the mid bass modules, and then the MBMs with your speakers.

kgveteran 08-09-2019 12:40 PM

27 Attachment(s)
Quote:

Originally Posted by sdurani (Post 58402400)
The idea behind MBMs is that the lower part of the bass range is better reproduced by large subwoofers pressurizing the room while the mid-bass is better reproduced by smaller/faster woofers (MBMs) placed nearfield. So, for example, if you cross over to your speakers at 80Hz, you connect the subwoofer output from your receiver to an external device that splits the bass below 80Hz into two parts: below, say, 50Hz goes to your big subs placed at room boundaries; above 50Hz goes to the MBM placed next to you. This helps to separately optimize low bass rumble and tight mid-bass punch (gunfire, explosions, drum whacks). Or so the theory goes. Integration means blending your low bass subs with the mid bass modules, and then the MBMs with your speakers.

So.... if i have sub out 1 & 2 on my Denon receiver, subout1 can be allocated to my main sealed subs, and subout2 can go to some type of XO for the MBM ??

Or do i have to remove the band of MBM sound by using the 1subout with an active XO

sdurani 08-09-2019 02:56 PM

Quote:

Originally Posted by kgveteran (Post 58402964)
So.... if i have sub out 1 & 2 on my Denon receiver, subout1 can be allocated to my main sealed subs, and subout2 can go to some type of XO for the MBM ??

Or do i have to remove the band of MBM sound by using the 1subout with an active XO

Your Denon receiver cannot split the subwoofer output into two bands. So if you're going to have to use some type of active XO, then might as well use it to feed both subs. This will allow you to dial in levels and delay (maybe even EQ) to get the best blend between your subs and MBMs. Once subwoofer optimization is done, then you can treat all of that as a single sub (albeit made up of many parts) and connect it to one of the sub outs on your Denon.

kgveteran 08-10-2019 11:29 AM

Quote:

Originally Posted by sdurani (Post 58402400)
The idea behind MBMs is that the lower part of the bass range is better reproduced by large subwoofers pressurizing the room while the mid-bass is better reproduced by smaller/faster woofers (MBMs) placed nearfield. So, for example, if you cross over to your speakers at 80Hz, you connect the subwoofer output from your receiver to an external device that splits the bass below 80Hz into two parts: below, say, 50Hz goes to your big subs placed at room boundaries; above 50Hz goes to the MBM placed next to you. This helps to separately optimize low bass rumble and tight mid-bass punch (gunfire, explosions, drum whacks). Or so the theory goes. Integration means blending your low bass subs with the mid bass modules, and then the MBMs with your speakers.

OK gotcha, my subwoofer system is now a two-way subwoofer system.

I would like to use three JBL 2226H drivers , One for my left one for my center and one for my right, just for fun.

They would all go behind my AT screen

kgveteran 08-10-2019 04:17 PM

So, what alignment is used for such a narrow bandwidth, just a regular ported shallow box that fits....

darrellh44 08-14-2019 07:26 AM

Quote:

Originally Posted by kgveteran (Post 58407246)
So, what alignment is used for such a narrow bandwidth, just a regular ported shallow box that fits....

The 2226H is a fantastic MBM driver that has been around for many years. I've always seen them in a ported alignment. Below is a link for a full-range speaker kit discussion using the 2226H. Wayne Parham is a very nice and helpful guy. I'm sure he would help you modify his design to make an MBM only version of his 4 Pi speaker.

https://audioroundtable.com/forum/in...22565&start=0&


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