BVR theory

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Tyimo

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Joined 2002
#1
Hi!

This question is basicaly for Scott and Dave:
What is the theory of the BVR calculation and planing?
I mean, how you choose the :
- chamber volume
- horn throat size
- horn mouth size
- horn lenght

Greets:

Tyimo
 
#4
Hi Scott, wow this would be amazing to peek inside your methodology.

Having heard your Harveys (built by Mssr. Phil Townsend), I am still haunted by how great and inexplicably huge they sound. One felt "bathed" in sound. That system (in that room etc.) is to date my standard of audio perfection.

For some reason, horns and horn-like speakers just cry out to be understood. I'm on my third year of trying but it's a tough slog.
 
#7
Hi Dave, I was thinking very literally of a box with an expo vent, since Tyimo was one of the original enthusiasts for the Replikon, and he was very keen to understand it. (And there is still something magical about Harvey - maybe the big mouth area and path length?)
 
#8
since Tyimo was one of the original enthusiasts for the Replikon, and he was very keen to understand it.
Click to expand...
Yes, it is true. On the end of that discourse I understanded the Replikon sucessfuly. 🙂 I built some Replikon style loudspeaker with great result. That Hornlautsprecher theory is realy works.
Now I would like to understand the BVR's theory what is similar to the Replikons.(some way...)
Tyimo
 
#11
Did you have a specific driver in mind?
Click to expand...
Hi Scott,
I would like to build BVR with this Sonido SFR200 http://www.sonido.hu/adat_pdf/sfr/sfr200-8.pdf
Do you think that it is suitable for that purpose? What housing do you recommend ? I think that of Half Chang will fit nicely, do you suggest any corrections in the design.
I think most of us will be grateful if you explain BVR design process and considerations.
Thank you in advance !
 
#14
Hi Vitalstates,
I bought them second hand, but a week before I wrote to Istvan (sonido@interware.hu)
and he readily gave me info about prices, shipping, technical specs, etc.
He is very kind man and I think that one will have any problem with buying speakers from him.
Minko
 
#16
Hi Dave!
These old question are not answered yet....

Code: 
This question is basicaly for Scott and Dave:
What is the theory of the BVR calculation and planing?
I mean, how you choose the :
- chamber volume
- horn throat size
- horn mouth size
- horn lenght
Could you answer them?
Greets:
Tyimo
 
#19
BVR as by Abraham Cohen of University Sound were common in the 1950's. Many of those had vents about 1/2 meter long and could provide gain in the "hit" region (depending upon driver strength) AJ-Horn (costly) will model them and assume Hornresp can do it too. Once a simulation looks workable then it can be built and tested.

Cohen pic
An externally hosted image should be here but it was not working when we last tested it.

Cohen pg 1
http://img236.imageshack.us/my.php?image=pg1kk9.png

Cohen pg2
http://img236.imageshack.us/img236/7050/pg3hb3.png

Cohen pg3
http://img236.imageshack.us/my.php?image=pg3hb3.png

hitbox half-horn with 70 liter chamber
http://img236.imageshack.us/img236/4157/hitboxrcafanyz7.jpg

halfhorn for 8"
http://img236.imageshack.us/img236/4003/shahin3mplxa2.gif

Gately Super Horn article
pg1
http://img519.imageshack.us/img519/9072/gate18sl.jpg

pg2
http://img525.imageshack.us/img525/3506/gate20eb.jpg

detail - looks to me Z-min was ~80Hz
http://img525.imageshack.us/img525/6945/gate32gx.jpg

Aristocrat plans
http://db.audioasylum.com/cgi/m.mpl?forum=hug&n=104213
 
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