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What fullrange backloaded horn (with optional dipole AMT tweeter on top) to build?
What fullrange backloaded horn (with optional dipole AMT tweeter on top) to build?
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Old 13th November 2019, 02:32 PM   #1
Groundloops is offline Groundloops
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What fullrange backloaded horn (with optional dipole AMT tweeter on top) to build?
Question What fullrange backloaded horn (with optional dipole AMT tweeter on top) to build?

Folks, I need your advice: I want to build a fullrange backloaded horn loudspeaker, preferably 6-8" driver, with low distance from driver edge to upper enclosure edge for placing an ESS AMT-1 Air Motion Transformer on top. The thought is to have kinda dual use loudspeaker, switchable from fullrange to 2-way. I need something giving decent resolution at low listening volume (≤ 70db). I intend to cross it as low as possible (1-2kHz) with steep active filter and DSP EQ.

What driver in what enclosure do you recommend?

Thank you for your thoughts!

Last edited by Groundloops; 13th November 2019 at 03:10 PM.
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Old 13th November 2019, 05:55 PM   #2
pelanj is offline pelanj  Czech Republic
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What fullrange backloaded horn (with optional dipole AMT tweeter on top) to build?
Did you look at Horst's designs at hm-moreart.de? For a great price to performance ratio, I recommend Sonido 8" AlNiCo - and you will not really need a tweeter, maybe only to add some air on the top.
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Old 14th November 2019, 02:21 AM   #3
xrk971 is online now xrk971  United States
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What fullrange backloaded horn (with optional dipole AMT tweeter on top) to build?
Synergy Horn with AMT

Click the image to open in full size.

B&C 6MDN44 midrange
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Old 14th November 2019, 07:06 AM   #4
Groundloops is offline Groundloops
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What fullrange backloaded horn (with optional dipole AMT tweeter on top) to build?
Thank you so far!

@ pelanj: Looking at the price tag, saying 'No way' ...

@ xrk971: Well, I'd really love to try that too. But in my 5x4.5 m (16.4x14.8 ft) listening and living room a 3 ft. deep construction is way too big as I reckon it needs some distance to the rear wall . What are the crossover frequencies, by interest?
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Old 14th November 2019, 10:00 AM   #5
waxx is offline waxx  Belgium
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This is a good kit from a german webshop that is not too expensive. The Tangband W8-1772 is a known good driver for this.

I've not build it, but a friend has, and it does sound very good in this application.

W8-1772-Horn
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Old 14th November 2019, 10:31 AM   #6
pelanj is offline pelanj  Czech Republic
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What fullrange backloaded horn (with optional dipole AMT tweeter on top) to build?
What is the budget? A pair of Sonido 8" ferite fullrangers is almost less than the linked kit for one box. Sonido Archivy - Audio-DIY

I can also highly recommend the ferite 175 in its recommended horn - see sonido.hu for designs - if you write an e-mail to them, they have many other designs to share. The only issue with the one I have is, that you cannot place a tweeter on top, since the driver is placed lower.
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Old 14th November 2019, 12:15 PM   #7
Groundloops is offline Groundloops
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What fullrange backloaded horn (with optional dipole AMT tweeter on top) to build?
@ waxx: Indeed that is one of the candidates for my project. How is low level listening? Most of the fullrange drivers I savoured need relatively high volume to sound right.

@ pelanj: Obviously I got something wrong regarding the Sonido prices. Thanks for clarification. The Sonido BLH designs look very interesting indeed! What driver exactly are you referring to - SFR-200a?

Last edited by Groundloops; 14th November 2019 at 12:15 PM. Reason: typo
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Old 14th November 2019, 12:27 PM   #8
pelanj is offline pelanj  Czech Republic
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What fullrange backloaded horn (with optional dipole AMT tweeter on top) to build?
Yes, I have a pair of SFR200A and SFR175 (in the horn that is shown on the Sonido web site - this one: http://sonido.hu/adat_pdf/diy-sfr175-backloaded.pdf). The nice thing about Sonido is, that their response is free of the nasty rise that some FR speakers have. If you would like to get some inspiration, please have a look into the gallery at the Sonido website (Gallery - sonido.hu) and send them an e-mail. I did that and I have like 5 different suggestions for the SFR200A, but no time to choose - some designs are here: DIY! - sonido.hu

I actually started to be interested in Sonido when I heard the SFR200A in a folded TQWT. Very natural sound, especially the percussions were awesome. Concerning the low level listening, these are very sensitive, so I recommend a class A amplifier to get the best out of them at low volumes.

Last edited by pelanj; 14th November 2019 at 12:31 PM.
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Old 14th November 2019, 12:48 PM   #9
waxx is offline waxx  Belgium
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Quote:
Originally Posted by Groundloops View Post
@ waxx: Indeed that is one of the candidates for my project. How is low level listening? Most of the fullrange drivers I savoured need relatively high volume to sound right.
The owner use a 3w Line Magnetic EL84 SE amp, but as it was build with my help at my house we also tested it with my Prima Luna Prologue 4 (32w EL34 PP tube amp) and a Marantz PM5004 (45w class AB transistor). in all situation it sounded very good, altough the Prima Luna and the Marantz are way to powerfull for this high efficient driver in a small room. My living room is 8x6x2.5m and there it was already too powerfull. The 3w SE amp was better for this speaker. Your listening room is half that if i'm right so with a few watt it will be enough.

And to give you an other option, a Frugalhorn XL with an Mark Audio Alpair 10M Gen 3 is also a good option. That driver is better on low level than the tangband (wich is still very good) if you ask me, and a bit less efficient (so it's a bit more flexibel on amps). The difference is small (and may be subjective). I run ported boxes now with that driver and i love it.
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Old 14th November 2019, 03:31 PM   #10
xrk971 is online now xrk971  United States
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What fullrange backloaded horn (with optional dipole AMT tweeter on top) to build?
The size of the horn can be made much more compact - depends on what uniform dispersion angle you want - wider is more compact. I had a 45 deg horn and I wanted the directivity to go low so it was big. I can see more compact 20in deep plus a 3in deep rear chamber stuffed with fiberglass working well for a 90deg horn. You could use an 8in woofer instead of a 6in mid and go much deeper - down to say 80Hz for a sub to take over.

The AMT in a horn is almost a full range. The electrical XO freq was 800Hz but acoustically it was 600Hz - so basically a FAST topology.

It's the BEST sounding speaker I have ever heard - very special.
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