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I am fascinated with MTM designs. Correct me where I am wrong here but here's how I see it:
MTM allows two smallish woofers to be used so they are superior in speed to two ways with a single , larger woofer. At the same time, the two woofers have sufficient surface area for equivalent bass depth and response.
I think I prefer certain tweeters and am looking for a good mid/tweet combo for optimum speed without being dry or etchy/analytical.
Here is what I gather:
Focal tioxid tweeter [inverted ti-oxide dome]= very revealing, but etchy, with a possibility of hardness, and metallic zing in some instances. Can be fatiguing in some applications
Silk: very musical, but softish highs. Suited to choral, and acoustic music [like a lot of Audax units] not for high dynamics
Dynaudio esotar- very good but overpriced, and can be bright-ish, no longer avail to diy kits.
Scan speak- very airy and detailed
Seas excel/millenium- very detailed without metallic ring
Vifa al= detailed, smooth for a metal dome, but not the last word in detail
Raven ribbon: detailed, fast, expensive and a pain to integrate...
Follow Ups:
I've been very happy with my GR Research Paradox 3 kit. It uses the Focal titanium tweeter, but I do not find its highs to be sharp; rather, they're very smooth -- much better than a silk-dome tweeter that I had in another DIY project prior to the P-3's. Check out the reviews.
I was going to suggest this design as well!-Tom
DIY4now,
I own the North Creek Music System Rhythm Revelator w/.5 dB matched drivers and external XO. I couldn't be happier. They are so musical, I sit and listen for hours & hours.I could be more specific, but I don't want to be too long winded in this context. If you have specific questions, I'd be happy to lend my $.02 worth.
There are other fine kits available to be sure. I've heard a few, but not most of them. However, I'm confident in stating that the NCMS Rhythm is amongst the very best.
Spend some time examining all the components of the completed loudspeaker (i.e. crossover design & parts, drivers, enclosures, etc.) Even better, if possible, listen to everything that you can.
Best of luck
More important than a speaker's (or it's drivers) technology, is whether the completed speaker allows you to enjoy your music. I really thought that my Zalytron "Mars" kit (Zalytron.com), was the be all end all speaker (Raven R2, Focal 7K). I mean I would sit there, and the internal dialog was like: "listen to those highs, amazing." Now, I listen to a six inch paper driver, with no tweeter (or crossover). I no longer sit there listening to sounds. I'm listening to music, Elmo.
MTM designs are an effort to control lobing patterns in the verticle plane. That's why laying one on its side (which is all too common) screws with the radiation pattern. Adding an additional woofer does not lower the bass response and make for "faster bass". The resonant frequencies of the woofers don't change, no matter how many you have. It does add 6dB to the output within its operating range, minimising or eliminating the necessity to pad down the tweeter with resistors(which is a good thing). If you want deeper bass and more of it, get a 15" or 18" woofer with a low resonant frequency and high x-max.Your conclusions regarding the characteristics of certain tweeter designs are not entirely correct. The idea that metal domes are "etched" and "analytical" and that soft domes are "smooth" and "soft" are not correct. The problems lie in the designer's inability to integrate the drivers within a system with the proper crossover or just plain choosing the wrong driver in the first place.
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