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Old 7th November 2012, 05:06 PM   #1
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Default Multi-way Horn System

Hello all,
As a fairly newb here, I am amazed at the level of participation and knowledge sharing at ALL levels form people doing builds to those doing theoretical work. Thank you all for keeping the DIY audio efforts going.
Now onto the thread. I am planning on building a horn based system and would like to get some inputs before I start making sawdust.
My thoughts are for a 4 way system consisting of the following:
1) Low End to 80 (or 100)Hz: Bill Fitzmaurice Tuba HT (THT)
2) 80 to 500: Midbass based on John Inlow’s 100Hz B&C design (Mid-bass horn (easy to build)) but extended down to 80 Hz. I’ll probably need some help with this later.
3) 500 to 5k: Le Cleach 300Hz horn (DIY wood design) using JBL 2446 drivers that I have.
4) 5k and up: TBD. I was thinking of a bullet tweeter but don’t like the HD specs. I am looking at a Beyma T2030 tweeter because it has high sensitivity, good HD performance, and controlled dispersion (to better match the horns)
5) Mini DSP Xover and various amps
I plan on using this system for both audio and HT. It will be in a new room approximately 15 ft wide, 7-1/2 ft high and TBD long.
Any inputs on the overall compliment of drivers etc would be appreciated.
Thanks
Bob
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Old 7th November 2012, 06:41 PM   #2
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you can find lots of great info here inlowsound.com Best regards Moray James.
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Old 7th November 2012, 06:44 PM   #3
ORNJ is offline ORNJ  United States
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website that may interest you.
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Old 7th November 2012, 07:34 PM   #4
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The T 2031 is the only that directly radiates ( even if it has a flare )
the others are put in some geometric boundaries that make the sound bounce
which is not good for domestic environment and for Hi-Fi
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Old 7th November 2012, 07:53 PM   #5
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Quote:
Originally Posted by rocksteady40
Mini DSP Xover and various amps.
I plan on using this system for both audio and HT. It will be in a new room approximately 15 ft wide, 7-1/2 ft high
Some research into corner speakers seems worthwhile with your room size and shape. Wayne's whitepaper on corner speakers at pispeakers.com is one of several web doc's that describe the efficiency+sound_stage advantages of corner speakers. Dr. Geddes research on multi-woofer bass seems worth review.

PERSONALLY;

FIRST: I would buy an 80" Sharp LED TV during Black Friday Sales to "help launch" the HT. Life is short! Your family can watch HT this XMAS.

SECOND: I would stare at speaker-porn like the JBL DD6600 and read Dr. Geddes paper on distributed multi-woofer bass to convince myself that a horn woofer is not optimum, especially with Mini-DSP multi-amps. So.., either two 15" woofers or a single 18"-21" for the corners, plus a couple identical woofers carefully located around the room. With DSP, sealed woofers with mic-measured DSP equalization work well. As Dr. Geddes paper teaches, you can equalize bass for one listening seat, but you cannot equalize the room's multi-mode bass over the main HT seats. Only multi-woofers can help smooth deep bass modes within a HT.

THIRD: With steep Xover slopes from the Mini-DSP a three-way becomes attractive. For the MT, only your ears can decide between
1) 10"-12" cone midbass, plus a 1" CD with SEOS15 or Beyma TLP150H HEIL;
2) a LARGE midbass horn + horn or ribbon tweeter
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Last edited by LineSource; 7th November 2012 at 08:02 PM.
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Old 7th November 2012, 08:35 PM   #6
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Quote:
Originally Posted by LineSource View Post

PERSONALLY;

FIRST: I would buy an 80" Sharp LED TV during Black Friday Sales to "help launch" the HT. Life is short! Your family can watch HT this XMAS.
And watch it ! Some programs might be very amusing !
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Old 7th November 2012, 08:55 PM   #7
Bare is offline Bare  Canada
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Look Here :
5 way project - tapped, bass, mids and tweeter, big boy system

Realising that DIY is ...all... about fooling about .. the end result is perennially 'elusive ' :-)
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Old 8th November 2012, 09:31 AM   #8
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Thank everyone for your inputs/suggestions. I liked some of the characteristics of the SEOS15 and I'll have to look at the recommended readings.


I had a lot of exposure to Altec A7-500's in high school and became fond of horns. Although the A7's have their shortcomings, there's just something about the energy/dynamics that horns provide that appeal to me. Most bass/bid-basss horn construction posts that I have read talk about the impact and effortlessness that the hons have.


Have to go shovel some snow now :-(
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Old 8th November 2012, 02:36 PM   #9
coresta is offline coresta  France
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Go for an ALTEC A5 (muticell ...) and don't loose time on other gizmos (Lecleach, Iwatas Fostex , mantarays ...)
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Old 8th November 2012, 09:50 PM   #10
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3 on-a-couch sweet spot ... ... illustration from pispeakers literature
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