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In Reply to: RE: Moth Audio Empire Sub posted by EduardG on October 26, 2014 at 18:50:45
Hi Ed,
I actually do have a concrete slab floor. I don't think that I would go to this extreme. I've considered a Bill Fitzmaurice HT Tuba, but the straight one. It's just a 7' long box that you can point straight up. Upward firing. I have 18' high cathedral ceilings, and it is really shaped like a horn.
But we're not here to discuss subs, but mid/bass. I just thought there was a similarity in the two horn designs. Different in size and cutoff only? I see the closed back on the empire, and the stepped pyramid waveguide.
Did you ever measure your horns? What is the FR? What are your crossover points on this system?
That's enough for now.
Thanks,
Jamie
Big speakers and little amps blew my mind!
Follow Ups:
The output of the straight mid bass horn is very linear. It goes up to 500 Hz before rolling off and down to 80Hz at which point it begins to drop off like a rock. The x-over is first order 500Hz although recent listening test suggested that 4th order may offer some advantages.
That's a very good FR. More than two and half octaves. I wonder how it sounds from 400 to 500hz? I llke that you say it's linear. Really for yours to go down to 80hz is surprising. It doesn't look that long/tall. Even with the stands it doesn't look that tall. Long xmax driver?
Do you know the efficiency?
Boy, crossover slopes are a subject. They will have to wait, as it's bedtime on a work night.
Later,
Jamie
Big speakers and little amps blew my mind!
The beauty of the floor firing horn is that the entire open area on three sides is the mouth and is equal to about 560 sq inches. The total length of this particular 80Hz horn is 38 inches whereby the body is only 30 inches long and the last 8 inches is the distance from the bottom edge to the mouth. This arrangement allows for a very compact speaker. And, yes, it is remarkably linear. I should ask Bruce if he saved the data somewhere in the data base of his computer after we took the measurements.
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