Hi all, Merry Christmas!
Santa brought me (well, they are still on their way) four TB W4-1658SB drivers.
It looks to me as a prime candidate for a second order filter. The break-up is at 10 KHz or so, and they look pretty smooth up to 4 KHz on both charts).
I already have a good subwoofer, so I'm not very worried about their bass extension.
Given that I want to build a speaker with a controlled vertical dispersion, an MTM seems to be a natural choice.
Given that my wife doesn't care about vertical dispersion, crossover topologies or other stuff, but loves small, unobtrusive speakers, an MTM with small woofers and a sub looks like the best compromise for us all. :rofl:
My plan is to build an ultra small MTM with a SEAS 27TBFC/G, crossed over second order at around 2.9 KHz, with the TB drivers.
Given the specs of the drivers involved, I'd assume the crossover would be extremely simple, and the sound quality pretty high.
The only thing I'm worried is that there are no distortion measurements of the TB woofers. That's the first thing I'll take when they get here. I'd assume they shouldn't have much problems at the frequencies I'll be using them, though.
I want to go 2nd order because I've heard many good things about their power response. Hopefully, I chose the correct drivers for this task (I know the SEAS tweeter is an excellent choice. I'm not sure as to how low I could cross the driver without damage).
Let's see if I understand this correctly - excursion requirements quadruple when you go an octave lower... is this right? If so, would a 4th order, 1450 Hz filter (the one used in Zaph's BAMTM) require the same excursion as a 2nd order, 2900 Hz one? If so, am I correct in choosing 2.9 KHz as the crossover point?
I'm also unsure about the behavior of an MTM using 2nd order filters. I believe there shouldn't be an issue, but I'm not completely sure.
Thanks for any help...
Santa brought me (well, they are still on their way) four TB W4-1658SB drivers.
It looks to me as a prime candidate for a second order filter. The break-up is at 10 KHz or so, and they look pretty smooth up to 4 KHz on both charts).
I already have a good subwoofer, so I'm not very worried about their bass extension.
Given that I want to build a speaker with a controlled vertical dispersion, an MTM seems to be a natural choice.
Given that my wife doesn't care about vertical dispersion, crossover topologies or other stuff, but loves small, unobtrusive speakers, an MTM with small woofers and a sub looks like the best compromise for us all. :rofl:
My plan is to build an ultra small MTM with a SEAS 27TBFC/G, crossed over second order at around 2.9 KHz, with the TB drivers.
Given the specs of the drivers involved, I'd assume the crossover would be extremely simple, and the sound quality pretty high.
The only thing I'm worried is that there are no distortion measurements of the TB woofers. That's the first thing I'll take when they get here. I'd assume they shouldn't have much problems at the frequencies I'll be using them, though.
I want to go 2nd order because I've heard many good things about their power response. Hopefully, I chose the correct drivers for this task (I know the SEAS tweeter is an excellent choice. I'm not sure as to how low I could cross the driver without damage).
Let's see if I understand this correctly - excursion requirements quadruple when you go an octave lower... is this right? If so, would a 4th order, 1450 Hz filter (the one used in Zaph's BAMTM) require the same excursion as a 2nd order, 2900 Hz one? If so, am I correct in choosing 2.9 KHz as the crossover point?
I'm also unsure about the behavior of an MTM using 2nd order filters. I believe there shouldn't be an issue, but I'm not completely sure.
Thanks for any help...
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