Collaborative Tapped horn project - Page 53 - diyAudio
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Old 22nd July 2007, 07:53 PM   #521
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Default can anybody model this?

was wondering what impact in terms of load on driver this might have. Rather than mount the driver in the same plane as the internal baffle what about making the driver baffle sit at 45 degree angle at base of the collum with the driver tucked right into the corner tight. The area directly behind the magnet could be blocked off and the tap horn start with an opening equal to driver Sd right at the top edge of the driver. The idea is that the driver is now positioned to intercept the wavefront of the horn at closer to right angles than in the standard configuration. Acoustic coupling should be more intimate. Could anyone here with Akabak model the effect of this type of driver mounting position? Thanks. Moray James.

Freddy: this one of the things that I thinks makes a Karlson work so well. What do you think?

PS: I suppose that the driver could also be placed upon the bottom of the mouth section of the horn and fire into a sub vent with a CSA equal to driver Sd then the throat of the horn could begin at the back edge of the driver firing up. This would place the driver at a right angle to the wave front at the mouth of the horn.
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Old 22nd July 2007, 10:09 PM   #522
freddi is offline freddi  United States
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hi Moray - - K's can be fun - not sure of tap but they can make a lot of (good) noise without a lot of cone movement

here's two videos - one of K8 copy with vent - note low pressure area + same Sammi 8" speaker in sealed klam outdoors

t-P K8 fb maybe 80-85Hz - forgot to open up two slits so its only running 4 out od 6

keep audio way down or off on the first vid

http://img531.imageshack.us/my.php?i...ssurek8lc4.flv

klam8 outdoors - mic overloaded up close

http://img531.imageshack.us/my.php?i...jector1qu2.flv
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Old 22nd July 2007, 11:24 PM   #523
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Default Re: Re: Tapped horns for dummies

Quote:
Originally posted by Sabbelbacke

So far, that´s not discovered in full extend. It seems that drivers with a fairly high fs work better, resulting in a smoother frequency response.

So far most dedigns use a conical flare function, since it´s most easy to build. Of course, others are possible, too. hornresp and Akabak are capable of doing conical and exponential types. Theoreticaly, Hyperbolic and others should work, too. You can do some tweaking with the frequency response in Akabak and hornresp if you differ flare rate on the first and last segment from flare rate of the main part.
A conical flare is not only the easiest to build, it also offers the lowest F3. How great is that? On the downside, it's the least efficient. But personally I'd rather have a lower F3 than an extra DB of output.
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Old 23rd July 2007, 03:55 AM   #524
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Default Hey Freddy we are done...

this speaker does everything include wipe its own taper!!! Boy that little Klam sure kicks butt all on its own outside. So what do you think about the suggested driver position?
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Old 23rd July 2007, 02:42 PM   #525
freddi is offline freddi  United States
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haha - wipes its own taper !

whacha mean by driver position? - like down low in Ultra-Fidelity type vs the way Karlson mounted a speaker in a Klam? both seem to do something :^)
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Old 23rd July 2007, 03:32 PM   #526
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Default Hey Freddy....

I was referring to the TAP where the driver is mounted in the mouth at either a 45 degree angle or at 90 degrees right on the bottom of the mouth. I that position the driver cone should be subject to full frontal impact of the wave front in the horn. Considering the effect that microphone diaphragm position has I see this as a significant difference from the standard vertical mounting position we most often see.
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Old 23rd July 2007, 05:49 PM   #527
freddi is offline freddi  United States
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maybe Tom Danley has a half-way easy way to sim (?)

for ~30Hz skinny T-H, I'm looking for a driver which which will work well in ~6ft tall box - that Beyma a bit back looks good but is pricey

will there ever by a kollaborative Karlson thread in my lifetime?
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Old 23rd July 2007, 09:07 PM   #528
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[QUOTE]way cool Circlomanen ! - in USA, Beyma carry relatively high price - some B&C might work[/QUOTE

Thanks!!

The B&C drivers you have listed all have to low VAS and too low Qts and too high BL. They all need very tight throats to work well, and that gives dynamic compression and distortion when driven hard.
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Old 23rd July 2007, 09:21 PM   #529
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yes - those B&C look bad in sims - which other drivers are like your Beyma?
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Old 24th July 2007, 12:54 AM   #530
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Default Circlomanen what do you think...

about the 60 Hz Tap that William Cowan built with an 18 Sound 10W400 driver? of all the units he has built with this one has the smoothest anf widest response 50 Hz to 260 Hz. This looks just like a driver that would be excellent in a Ripole design. The Vas is low and it works great. The Bl is also low which I think is a good thing in a TAP horn. Any comments?


THIELE SMALL PARAMETERS (8)
Fs 70 Hz
Re 5,1 Ohm
Sd 0,035 sq.mt. (54,25 sq.in.)
Qms 3,99
Qes 0,44
Qts 0,4
Vas 31 lt. (1,10 cuft)
Mms 27 gr. (0,06 lb)
BL 11,7 Tm
Linear Mathematical Xmax (9) ± 5,5 mm (± 0,22 in)
Le (1kHz) 1,2 mH
Ref. Efficiency 1W@1m (half space) 96 dB
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