Stroker Folded horn

[bhg41088]

I have a 15" cerwin vega stroker d4 and im wanting to build a folded horn for my room. I needing to know how much space im looking at for this enclosure. And im wanting, descently deep, very loud bass. Probably will recieve 300-700rms.

[Centauri]

Would need T/S parameters for driver. I have info on a Stroker15" but it says power is 150W, so is probably different model to your d4. Parameters for Cerwin Vega won't be easy to find, but is required to design suitable horn.

Alternatively, if you have access to measuring gear, then you could measure parameters of units you have.

Cheers

[bhg41088]

http://www.cerwinvega.com/products/p...s/apstkr15.pdf

[mikee12345]

It seems to want a tiny throat long horn,not the best.

Cheers!

[Centauri]

Actually, doesn't model too bad. With 7200cm^2 mouth, 200cm^2 throat and 350cm path length response good to 40Hz with corner loading (1/8 space).

Expect a box about 2ft wide, 4ft high and about 3 to 4ft deep (depending on folding) - not sure if your room could stand this size. Any smaller and you start compromising the response.

Cheers

[bhg41088]

Hey Centauri, wouldnt educating a newb on AIM for a little while would you? BHG41088. Oh, and anyone else who can help, im all open for it. Oh, and my horn can be pretty good size, my room is in the basement, so Its 28x11 feet. The horn cant exceed 7 or 8 feet tall though.

[mikee12345]

With 7200cm^2 mouth

exactly! huge mouth :-)
but since is a bassment..


and ONLY 40hz!

its not optimal,but it will be loud and big.

(toxicport.e here)

Cheers

[Centauri]

Originally posted by mikee12345

exactly! huge mouth :-)

and ONLY 40hz!

This is not huge by Pro sound standards - fairly common size, and about 1/8 of the theoretical optimum (hence the smooth response when corner loaded). If you go smaller than this, then passband ripple becomes too large.

How much lower would you want to go? There is virtually no information on recorded material below 40Hz anyway - only harmonics of anything that low. There is an advantage in lower response in live audio, as some instruments can get that low.

Cheers

[mikee12345]

I DO miss those lows when using my 40hz basshorn instead of my 2226 33hz tuned....so aim for 33hz ish response with my horn.

For most 40hz will do though.

If you go smaller than this, then passband ripple becomes too large.

i can cope with 'some' rippleas my room will stuff it up more anyway.

it just depends how much compromise u must take,for my tiny horns i have to take alot.

[Centauri]

Mike,

It will be very interesting when you get your 30Hz horn built, as to whether you feel it is still missing something compared to the JBL. The BR box will generate more distortion down that low, and due to our ear's response, we probably hear more of the distortion products than the fundamental itself. The horn should have lower distortion and may not sound "right" as we have been conditioned to accept bass distortion as being normal.

Happy sawing!

Cheers