horn woofer ideal TS parameter

[PatAllen]

Hi, i am new to folded horn and try to read as much as i can but as with forums and internet is, i get all kind of mixed confusing or oposite answers...in short what i am looking at is what would be the target "ideal" TS parameters to aim for a 15 inch driver for a horn loaded enclosure of about 50 inches long taper.

also what is the effect on resonance or frequency response of the overall enclosure about the volume of the rear closed chamber.

i have diy Hartsfield prototype on hand and try to play with it and get the much out of it that i can.

thanks.

 

[GM]

Then suggest you get the 'ideal' specs from the JBL folks. 😉

The driver chamber is a low pass filter, so governs its LF response, which in turn requires knowing the design parameters or driver specs. Suggest you start your research with this doc to get 'comfortable' with T/S horn theory design.😉

 

[PeteMcK]

Chase down an article by Bruce Edgar, in which he explains it well,
- link here: https://volvotreter.de/downloads/Edgar-Show-Horn.pdf

 

[GM]

Thanks! Was aware of it, but yet to read it and if @rickmcinnis's Edgar horn is designed based on it, not real impressed, but we apparently have/had different performance goals.

 

[Arez]

Hi, i am new to folded horn and try to read as much as i can but as with forums and internet is, i get all kind of mixed confusing or oposite answers...in short what i am looking at is what would be the target "ideal" TS parameters to aim for a 15 inch driver for a horn loaded enclosure of about 50 inches long taper.

i have diy Hartsfield prototype on hand and try to play with it and get the much out of it that i can.

https://www.lansingheritage.org/html/jbl/specs/home-comp/150-4.htm

 

[freddi]

When Bruce did the "Monolith" horn for me, we went with a JBL 2220H. For low frequency work only, an Eminence -Dayton spec with larger xmax worked better. IMO 2220H has some "cone cry" (dustcap ?) - it was one of the woofers of choice back in the day along with EV15L/B and used on Bruce's first 100Hz straight horn.

https://www.volvotreter.de/downloads/Edgar-Monolith-Horn.pdf

That yellow trace was for a K43 spec Eminence - Klipsch woofer. 2220H exhibited higher distortion but a better bandwidth than 43 spec

 

[woodo]

probably aimed at those who remember their maths classes but acknowledges those (like me) who perhaps math wasn't their favourite subject with some practical examples and illustrations. http://quarter-wave.com/ and https://kolbrek.hornspeakersystems.info/index.php/publications (particularly the AudioExpress magazine articles initially).