Originally Posted by Erich H
You're likely getting some cancellation issues. After you tune the MBM lower you should turn off both Rythmik subs and put the MBM in the same place as one of them and feed it some power.
FOHTech, any idea how one of the MBM's should compare to two of those LVX 12" subwoofers for midbass?
So the 12” sub you have hasnt been tested by Ricci, however he has done an FV15HP. It seems this model has more output and a larger cone so I woukd say maybe take 3db or more off of these numbers. Both ports open, the FV15 does 119.5 at 50, so I would say youre 12 may Max Burst 116 or so both ports open. The Mag will do better. If youre tuned for 60Hz, then if I recall when I designed mine, your 60-70 levels should be higher than 121. The FV15 is 120 at 70, so the Mag MBM should outperform the FV15 and definately your 12. I would focus your time on doing the below test Erich and I recommend, however you will need to set up some HP filtering on the Rhythmic or use an REW system.
Mixing an MBM and a sub that has low extension and conpletely different tune is not going to work. You have two options, first run the MBM crossed at 40s and above and the LVX12 below that and work out the integration at the crossover point, or... purchase a MiniDSP device, and read about the ways of integrating subwoofers of different tune and output in a space. Its time consuming. I’m sure youre getting cancellation and nulls Erich had a great simple test. run just the Mag12 in the Rhythmic spot and aee what you get. Also, ears can lie, If you dont have any REW type equipment, then use your iphone or android device and just compare results using a SPL meter app, just for comparison. Keep everything the same.
These drivers are truly a great design. I’m going to be upgrading my amps to them, as my amp is running out of steam before these drivers are. A true higher voltage 1000-1200watts per pair at 4ohms will do the trick. Electrically they will handle 1000w, and with a steep HP at 30Hz and a tune at 42, Im getting great use of Xmax. Granted my house curve peaks are eating up alot of headroom in the amp and excursion, buuuuuuuut man, does it sound GOOD! I’m going to be purchasing more. Very soon. Another 6db.... YES Please!! Lol. If you don’t like yours let me know!! I need the Over 50 Content needs to keep up with my sub 50 content going to my sealed HS24s. Saving all that excusrion and energy usage above 40 from my HS24s for more VLF content. The drivers are both operating efficiently in their wheelhouse.
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