Vague horn questions

[bigwill]

• Is it possible to get a backloaded 18" driver from 40Hz to around 150Hz with 100dB or more efficiency? (In a bass "scoop")
  
• Is the subjective bass quality tight and clean?
  

I have actually read around the internet quite a bit on this subject but I haven't been able to answer these questions.

Usually I'm all for OB bass but horns have grabbed my attention recently, namely due to their high efficiency.

I don't require deep bass but I love 'punchy' and 'tight' bass, which horns are said to be renowned for and I would love a system that was 100dB from 40hz-20,000hz

 

[bigwill]

(Don't worry about putting huge effort into answers this is all mere speculation on my part at the moment)

 

[GM]

Yes/yes, think big.

 

[limono]

Hi
Check out Audiogon listing of Edgar Horn mid bass (sold) .There is a picture of dual 18" BLH built by JohnK (John Kalinowski) It will give you an idea of how big those bass towers are . John is very friendly and helpful ,I 'd shot him an email .My EV Patrician IV sporting 18" is twice the size of my bachelor fridge . (a little bigger than double door fridge) .

 

[bigwill]

How well would scaling this up to fit a suitable 18" driver work:

http://www.dancetech.com/aa_dt_new/articles/item.cfm?threadid=171&lang=0

 

[GM]

Considering Hornresp, etc., why would you want to take such a hit-or-miss performance gamble?

GM

 

[bigwill]

I haven't figured out hornresp yet Maybe I should.........

 

[AKN]

Hi,

How about this Rog Mogale designed scoop (18" driver):
http://www.speakerplans.com/index.php?id=18superscooper

Rog has caveats for scoops muddying midbass just where the driver direct radiation starts to rise and mix with the horn output.

I have built 15" scoops in the past and was quite satisfied. It should be mentioned that I used my scoops below the supposed "trouble range" in the upper midbass.

Se this JBL document for typical scoop response curves:
http://www.jblpro.com/pub/obsolete/Low_Frequency_Enclosures2.pdf
It can be seen that everything is fine under ~100Hz then comes the "trouble range" as mentioned above.