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In Reply to: RE: Active/passive MMG help posted by Satie on March 31, 2017 at 11:05:26
Thanks, I ordered the miniDSP. I can see myself building PLLXO afterwards, just seems like fun. Thanks for all the replies, I really appreciate forums like these on all different subjects.
I was wondering about the open space beneath the speaker after reading some about enclosing the backs a little also. I'll extend it down. I already routed a 45 on the bottom edge but I'll just put another edge on the adjoining piece and it will a make a nice V accent line. What about putting wings on the sides? I am on the fence about putting a support from the top down to the feet. It doesn't need it as they are oak and very rigid but it might look good and if I made it a full wing would it reinforce the bass further? Was also juggling with the idea of a small woofer box instead of feet with the MMG frame mounted to the box. Immense amounts of reading about matching subs with MMG. I don't have room for the large dipole subs and I don't like huge amounts of bass but I do like some dynamic range. A friend has a pair of stacked 1.7i's and some expensive subs and when I listened to the system it sounded great, then I found out the subs were not turned on and after he turned them on I liked it better without the subs. But, something small since I don't have the large bass surface area of stacked 1.7i's. Obviously DIY is preferred.
Follow Ups:
If you do use a wing then do it on only one side as two sides will create a cavity resonance.
There are quite a few guys who installed small subwoofers under their raised MMGs.See if you can find something useful that would fit in the open slot you created under the panel. There are probably plenty of 8" subs that would fit and possibly a 10 incher. Green Lantern did such a thing with a pair of sealed subs.
Another option is a W frame open baffle sub which is not as tall as an H frame with the same drivers and you are likely to be able to fit one built around 10" drivers in your open space under the panels.
GR Research has an 8" woofer designed specifically for open baffle use. You can install two in an H or W frame, and lay the frame on it's side, with the two woofers laying horizontally under the MMG's. The regular version of the OB/Dipole Sub using 12" woofers can be used on it's side as well, and the H and W frame for them is only 16" wide (or high when laid on it's side).
How about posting a side photograph that illustrates how the "sandwich" is constructed? This is an important aspect of this type of construction and I've seen numerous incorrect implementations.
Dave.
Here you go. Don't mind the mess of wires and the TV I'm repairing. Extra wires are there for bi-amping and not hooked up and the very temp crossover is just laying there hooked up with a combination of speaker wire utilizing the binding posts for connections lol.
I used your design to start with Davey. Had a hell of a time finding them since they moved. Lots of references to it but all the links were dead until I found a mention somewhere of a domain switch so I just edited the link and found it. So much info on the Maggies is quite old. You'll notice the 1/4" spacers in the middle do not extend all the way to the corners. Havn't decided if I'll extend them as anywhere there is a screw pulling the halves together the spacer is present. Really just got a functional unit together so I could test and will revise the plans for the other channel and actually I'm using an MMG as a center channel also. Small room and I'm the only one in the house that cares about quality so it aims at a love seat with no beaming issues for those two listening positions.
Excellent. I was just concerned you were putting the death grip on the transducer units by not utilizing a proper spacer scheme.
Well done. Carry on.
Dave.
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