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In Reply to: RE: Down-Firing Straight Edgar Style Mid/Bass Horns posted by EduardG on October 25, 2014 at 21:02:23
So it sounds like you put a lot of math and work at the exhaust end? The wave guide at the bottom took more work than it looks like? Pictures of the rear termination to the bottom would be great. It reminds me of a huge Victorian sub Moth Audio had, because of the waveguide at the bottom, but theirs was stepped, and yours is like a pyramid. I wonder if a curved termination in the back would make it something like a J horn?
Fc is 80hz? What are you crossover points on this system?
I love these horns. Probably got to go to bed. Later.
J
Big speakers and little amps blew my mind!
Follow Ups:
Bruce just called. He wants to write an article based on this system and generally elaborate on floor firing horns. This should be exiting.
Hi J!
Actually those old Moth Audio horns were designed by Bruce for them. That's why it looks so much like an Edgarhorn and now you know the rest of the story...
I'm listening to: Afterdark by Halie Loren
Thetubeguy1954 (Tom Scata)
Central Florida Audio Society -- SETriodes Group -- Space Coast Audio Society
Full-range/Wide-range Drivers --- Front & Back-Loaded Horns --- High Sensitivity Speakers
I always liked Moth Audio's styling. Sometimes in life it's the little touches.
Big speakers and little amps blew my mind!
You like the Moth Audio sub's looks, huh? Well that's why with music, audio gear and women beauty is in the eye of the beholder. I have a thing for short 4'11" - 5'4" women with tan - olive complexion and very dark brown - black hair. While my friend loves taller 5'6" - 5'11" women with milky white to very light skin and platinum - light yellow blonde hair! I'm an SET/jazz man, he's like Hybrid/rock. I like horns and he likes planar speakers. Heck even though we both love Prog-Rock such as; Yes, Genesis, Triumvirate, Kansas etc. When we're playing a recording 9 out 10 times we'll disagree what's the best cut on the recording or side of the LP if it's vinyl.
Still he's my best friend up in New England, we both love women, music and audio. Plus we have a great time listening to each other's audio systems! As for the Moth Audio Empire Sub, as wonderful as I'm sure it sounds, I just couldn't live with a pseudo-Empire State building in my audio room. Whereas you like the looks. Maybe you're a blonde or red-head man too? There's certainly nothing wrong with people liking different aesthetics, right? With women it what's inside that's important and with audio it's how it sounds, not how it looks!
I'm Listening To: From Me To You by Tom Coster
Thetubeguy1954 (Tom Scata)
Central Florida Audio Society -- SETriodes Group -- Space Coast Audio Society
Full-range/Wide-range Drivers --- Front & Back-Loaded Horns --- High Sensitivity Speakers
It makes particularly good sense for a horn subwoofer. But you better have a very sturdy floor or better yet build your house on a concrete slab. The sub on the photo is a true 35Hz sub. 76" tall.
Edits: 10/26/14
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!
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.
I can hear Paul Harvey's radio voice clear as day.
Thanks Tom!
I think these horns show the hand of a master.
Jamie
Big speakers and little amps blew my mind!
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