FE168ESigma BLH recommendations please

[Scottmoose]

You're giving away your secrets here Ron... Now that I find very interesting. If you'll forgive me, I'll have to try that out -with credit duely accorded to yourself as the one who figured it out in the first place of course. Anything that improves design has got to be done / worth utilising in my book.

Best
Scott

[ronc]

with credit duely accorded to yourself as the one who figured it out in the first place

Not really. All i did was incorporate several ideas and papers/findings that have been established for years.
Several were based on radiation physics many on acoustics some on ultrasonics and even some on explosions inside of pressure vessels. Stir in some of MKs math, some advice from GM have a young computer savy guy write the program ( tweak it forever) and you get realistic answers.

ron

(A quote from the Fly: all i am is a systems management man, i rely on the work from people much more brilliant than me").

[hm]

Hi Ron,

"Nonsence" test it, who thinks he can use a horn more than 3 oktave didn´t understand something.

Look e.g. the TRUMPET testet and listening
with 3 driver, the driver are so different but
more ore less the same measurement,
the horn dominats the driver, one has a 0,8 Qts one 0,21
it worked.

If you make a lot of tests with different driver in the
same horn and simulation a few you will find a difference
of only 1-2 dB, try it. BASSTUBA e.g Manger Tannoy, Dynaudio.

Expo: I have the formula in mind, so it´s easy, if you look my flares, spec. the ALPHORN you see a different funnel constante
the last 70 cm.

Give me a link for the measurement and Impedanz.

Ron, if you the specialist, tell me the look
of the system-membranmovement of
SAXOPHON, TROMBONE,POSAUNE
you would help me.

Scottmouse:
"I can't see a problem with a driver / horn working to 400Hz either if it's accounted for in the design come to that."

How many construktions you´ve done and measurements,
a good bass horn should shut up above 150 Hz,
for PA it is not necessary, for HiFi a must, everything over
150 Hz direct, make the sound coloured like Lowther, Fostex horns.

It must not happen if you use the right material for the first
horn meter and the presschamber.

[Scottmoose]

How many? Probably around 25 or so various prototypes over the last couple of years, not including TLs, QWRs etc although obviously my own experience and knowledge, nay, wisdom, is far inferior to yours. I best abandon the double horn I had started to develop for this driver too, and another for the 208, so people will be able to use your designs as the only correct ones available. That'll teach me for believing GM, Ron, DaveD, Willam M. Leach, Tom Danly, the Fostex engineers, Terry Cain, Martin J. King, Dr B. Edgar, Olson, P.G.A.H. Voigt, Salmon etc. I really should have known better.

BTW -a minor point, but I think you'll find everything over ~73Hz is directional, not 150Hz.

[hm]

Hello,

i agree with you.

There are endless constructions out there,
And I read and repect your people list,
but e.g. Olson said ~1930
a HORN-SAT won´t work, it does, why?
my "secret" is evident, the mouth membran distance
an specially the low horn wall distance the last half of
the horn is the key to make it workable.

The last catalog like measurements from Visaton
and Hobby HiFi shows with the B200/horn-sat, 98 dB
+- 2 dB between 130 Hz-10000Hz, why they won´t publish it?

1 driver and an enclosure, wire thats it,
the buiseness is not happy with such solutions.


BTW: I meant with directly the mouth/listeners
Is there no construction left to show us?

[Scottmoose]

You mean of my boxes? Wish I owned a digital camera. I can occasionally (very occasionally) borrow one, but it's usually not worth it. Most of my test cabinets are quick one-offs now, in chipboard, and experiments more than anything else with little effort to refine them -they're slapped together to check a specific feature, then binned as quickly as they've served their purpose.

There are some shots here, on my friend Steve's site though of my last major construction -mine are the double BVR style BLHs with the grey baffles: http://web.mac.com/scress1958/iWeb/S...ostexFest.html The Spawn designs including Harvey (the cabinet pictured on the above link), on www.frugal-horn.com are all collaborative efforts between myself and DaveD. That's what I've been doing mostly over the last year or so anyway.