Small regal horn any suggestions?

[imagios]

Hello,
after having a FT-1600 MkII from Bob in my living room, I look as well for some nice design for a fullrange speaker to my bedroom. Due to very limited space I look for a regal/bookshelf design, it might be be a horn, with a reasonably priced driver and nice sound going down as much as possible, idealy below 50Hz if possible down to 40Hz.
I saw some Japanes horn pictures with small 3" or 4" drivers with a exponentional backloaded design in a size of a bookshelf...
But there are no plans

My room is 16 square meters small, concrete top and flor with brick wals. Speakers will be placed directly next to the bed. For now I will power them with a DIY Tamp , later I would build a Tube amp 2W or 8W depends on speakers and money

Do you have any suggestions with aweable plans? Im even ready to buy plans if it should be worth it.
Thanks,
Daniel - Imagios

[Bigun]

I've been looking for the same thing, a bookshelf sized horn speaker but I didn't find a really good option and most of the advice I received (which was good advice I believe) is that a very small horn has to compromise a lot of things so you might be better off with a different kind of enclosure than a horn. The main trouble is that a small horn means a shorter horn with smaller mouth and therefore a much higher cut-off frequency than you need. So you end up operating the horn where it isn't designed and it's response is not pretty.

The closest that I came across to something suitable is the Buschorn mk1, it's designed for a small driver.

[Leonidas]

35x35x13 cm , CC 1,2 liter , throath 90%.
No plans. Gave them to someone who uses them as pc-speakers , and is more then pleased.
Is the smallest backloaded hybride I ever designed.
A Fe83eN would do great!!

[imagios]

the fostex driver looks well a Tang Band might be as well a option..
encloasure seems to be fine, but without plans It would be a roulette to try. Did you simulated the design? Any measurements?


PS the japanese site : http://telavox.web.fc2.com/speaker_desktop.html

[hm]

Hello,
i made a small BLH but below 1oo Hz you need a sub,
the FLUTE SAT, tested and measured with Fostex FF85K
and the better sounded Omnes Audio BB3,01,
look my HP

bigger no bookshelf you can get 35 Hz, look
the TROMBONE and KORNETT double horns.

[Leonidas]

I agree with Horst (HM) , a 3or4 inch will NEVER reach 40 , 50 Hz.
My hybrids lowest point was about 100 Hz.
But if they do everything sweet above 100Hz you can hide some kind off sub (with a plate amp) somewhere in the room.
If you do find something that reaches deep below 100Hz with a 4 inch, please let me know!!
Good luck , Leon

[Scottmoose]

Well, actually it can in principle, as shown by the attached. That's a 3in FF85K. But you need a heck of a large horn & a wad of digital delay to do it.

Back in the land of practicality, LF is not going to happen with high efficiency & small size, as others note above.

[Leonidas]

Very Nice Scott !!

Any ideas about the size ?
Probably bigger as my house??

Sure it is posible but at the cost off.......

(I do like your attempt!!)

[Scottmoose]

Just about. That's a full-sized hyperpolic horn from when GM and I were having some fun, oh, must be a couple of years ago now.

I'd have to recheck the exact dimensions as it's been quite a while, but IIRC, axial length was 263in, M=0.385, St = 2.7in^2 & 74.5ft^2 terminus area. You'd need some digital delay of course on everything above Fhm as you'd otherwise have a completely unacceptable group delay (~19.4 ms).

Not exactly practical, or what you could call a desktop speaker. Could be good for a laugh though, if you've a spare barn handy. As I recall, GM's was even larger.

[imagios]

Well this small guy goes already below 100hz: Tang Band W3-1401SD 3" Neodymium Full Range Driver | Parts-Express.com

any way its for me more importand the encloasure will be reasonably small than that the driver must be 4" if I would be able to spend the money my choice would be the Jordan JX92S. But theyr fas beyond my budget. just for inspiration Hybrid Backloaded Horn Speakers - TelaVox annex to TelaAudio