I want to build a PSA style MTM (horn, 10" woofers)

Promit

Member
2009-11-16 2:53 pm
Basically, I want to build my own version of the PSA MTM-210T. High efficiency ported, horn loaded HF driver, dual 10" woofers. I'd also like it to be a good speaker for the money put in. Truth is I don't really know what I'm doing beyond going off some spec sheet items, and I'd really like some guidance on how to select suitable parts.

  • Waveguide: I'm pretty sure PSA uses this B&C exponential flare horn and I figure I will too
  • Compression driver: There are dozens of 1" titanium driver options. Intuitively I feel like one with a lower crossover will be better with the larger woofer, but there are still plenty of choices including half a dozen from B&C alone. I really have no idea how to compare these in any sensible way.
  • Woofer: I mean, dozens of 10" pro options on PE alone. Don't know where to start here except by throwing darts at Celestion, B&C, or Emi models.
  • Crossover: Actually, was thinking of going active bi-amp with DSP. Still trying to select a suitable amp here, open to suggestions.
Help or suggestions would be greatly appreciated. If I could get all of the components under $1000 per tower that would be ideal. I realize that speaker design is more than just throwing some components in a box and calling it a day, but maybe I can do something that's not a waste of money?

I am not interested in comments telling me to do something else.
 
You can build the speaker and improve it as you learn more about measurements and crossover design. DSP is a good platform for tweaking.

Most pro 10" drivers are designed to work above 60hz but there are some that can extend fairly low in that size box at the cost of efficiency.

Do you want it to work without subs?
 

Promit

Member
2009-11-16 2:53 pm
Most pro 10" drivers are designed to work above 60hz but there are some that can extend fairly low in that size box at the cost of efficiency.

Do you want it to work without subs?
It'll be paired with subs, but I like to run low crossovers on my mains (60, maybe even 40 Hz) so good extension matters. I'd pick extension over efficiency in general, but I have taken an interest in higher efficiency designs. I have to do some back of the envelope on box sizes but I think I can give them a reasonable amount of volume. I'm also considering an alternate approach where I small-box the MTM, then put the whole thing on top of an MBM.
 
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Couldn't edit my last post

You can build the speaker and improve it as you learn more about measurements and crossover design. DSP is a good platform for tweaking.

Most pro 10" drivers are designed to work above 60hz but there are some that can extend fairly low in that size box at the cost of efficiency.

Take a look at the US Speaker website for a wide selection of woofers for different applications. If you're not using a sub I would recommend a medium efficiency studio/home hi-fi woofer so you can reach into the low 30's in room for a full sounding low end. Some of the Beyma and Ciare drivers are designed with this in mind. From the hi-fi world the Satori WO24P-8 is ideal for this.

For tweeters, a 1" exit compression driver on a XT1086 is a solid choice. Cross around 1.5khz and listen with the horn at ear level. All the 1.75" or 2" diaphragm drivers from B&C, 18 Sound, Faital Pro, BMS, Radian, Tymphany, Celestion, and other reputable brands will work almost equally well in a home environment. Eq and crossovers is always the most important thing.

Hypex and Purifi have some of the best amps around. MiniDSP is popular for outboard dsp use.
 

Promit

Member
2009-11-16 2:53 pm
I kinda have a draft of a plan now, using a DNA-360 into a SEOS-10 waveguide and the Celestion CF1025C woofer. Seems tried and true to go with the DIYSG HF setup. The Celestion seems to be new on the scene but I really like how it never really seems to get out of sorts in the FR, no gigantic cone breakup spike. Ran a quick WinISD sim, looks like i can get it down to 55 Hz ported, maybe 50, which seems quite reasonable.