PoorManQ45 wrote:I always liked HSUs dedicated midbass drivers. Three MTMs, each sitting on a dedicated Midbass would be very ideal.
There's a few different thoughts on the subject, but HSU does market their MBM's for nearfield use using the LFE along with a subwoofer. Dr. Geddes presumes a person should use multiple MBM's (not HSU products but MBM's in general) spread throughout the room.
Others, like yourself, use them to help out their mains using their AVR's preamp outs, not the LFE.
PoorManQ45 wrote: I like checking out the partsexpress project section for cool ideas. I'm thinking something with a lot of 6.5" drivers for reinforcement would be nice, and not require too much air space. Or 8s, or hell 10s. Damnit, now i'm thinking 12's for tower speakers... You need 4 per speaker, right... That's normal, isn't it
You know I did buy 15's for use with my 3way towers I want to build, but due to a lack of time (and paralysis through analysis), I've been unable to build them.
PoorManQ45 wrote:With a MTM on midbass setup you'd get a very nice system.
The thing with an MTM is it puts a lot of stress on the tweeter. It undoubtably becomes the weakest link in the system. Why? A single driver is used for a certain bandwidth and due to the driver spacing of an MTM (between the mids) a lower crossover point is needed, which means the tweeter has an even larger bandwidth to operate in than it would in a TM alignment.
So that's the compromise with an MTM. You gain overall sensitivity because the 2nd mid can compensate for the baffle step compensation (typically a 3-6db loss in sensitivity), and you reduce vertical dispersion, which helps eliminate floor/ceiling bounce (which is why a horizontally placed MTM is bad, because it reduces horizontal dispersion), but stresses the tweeter more. Although that may not be an issue if you're using Morel ET or Supreme tweeters, but at >$300/pr. That said, I bought a Fountek Neopro5i to use as my tweeter. 305/ea
To help take some stress off the tweeter, a person could go with a TMM 2.5way design or even a MTM 2.5way (similar to a 3way MTW) because then you only have to worry about the center to center spacing of the tweeter to the mid instead of mid to mid in a conventional 2way MTM. That usually reduces the tweeter's operating range by an octave. It also introduces more hurdles to overcome in the crossover design including phasing which is beyond me. That's also why I've not built my speakers.
Modified by Looneybomber at 1:24 PM 8/9/2009