SEE MY 04-APR-09 POST FOR UPDATED INFO
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I've been building subs, and measuring TS parameters of speakers for a few years now, and was just recently critically listening to music on the MTM ported (39Hz) tower speakers i have hooked up to my mediaPC. They are well built, mitred MDF, 1/2" mostly, but 1" baffles, fully window-braced and lined with egg-crate foam.
They've always had an annoying upper midrange that i could never smooth with my parametric EQ. But otherwise I've always been pretty happy with these speakers, considering the price I paid. They do sound better (imaging, dispersion) with the lower of the MTM midbass unplugged (not so much the upper... directional IM or lobing maybe?), but this sacrifices balance in the lower mid and bass.
The tweeter is crossed over from best i can tell using 2nd ord LR, at about 3200Hz, (rated 8 ohms, with 3.3uFd mylar cap and from my measurements ~0.81mH 21AWG air core). The woofer is only 1st order, and seems to be using a 1.9mH (again from my impedance @10kHz measurement) FE-core only. The tweeter has a 3.4dB L-Pad, and a thermal varistor for protection.
I can submit impedance curves for trends if it would help, however, I'm not certain the magnitude on them is correct. However, i can say for sure that the 6.5" midbass are Fs=48Hz, and the 1" silk dome is Fs=950Hz.
Even suggestions of a complete redesign of the crossover is fine with me, although I think most of what I already have here can be worked with... let me know your thoughts please!!
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I've been building subs, and measuring TS parameters of speakers for a few years now, and was just recently critically listening to music on the MTM ported (39Hz) tower speakers i have hooked up to my mediaPC. They are well built, mitred MDF, 1/2" mostly, but 1" baffles, fully window-braced and lined with egg-crate foam.
They've always had an annoying upper midrange that i could never smooth with my parametric EQ. But otherwise I've always been pretty happy with these speakers, considering the price I paid. They do sound better (imaging, dispersion) with the lower of the MTM midbass unplugged (not so much the upper... directional IM or lobing maybe?), but this sacrifices balance in the lower mid and bass.
The tweeter is crossed over from best i can tell using 2nd ord LR, at about 3200Hz, (rated 8 ohms, with 3.3uFd mylar cap and from my measurements ~0.81mH 21AWG air core). The woofer is only 1st order, and seems to be using a 1.9mH (again from my impedance @10kHz measurement) FE-core only. The tweeter has a 3.4dB L-Pad, and a thermal varistor for protection.
I can submit impedance curves for trends if it would help, however, I'm not certain the magnitude on them is correct. However, i can say for sure that the 6.5" midbass are Fs=48Hz, and the 1" silk dome is Fs=950Hz.
Even suggestions of a complete redesign of the crossover is fine with me, although I think most of what I already have here can be worked with... let me know your thoughts please!!
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