Help designing a Rear loaded full range horn for KEF sp1014

[Naudio]

hi i am starting a new project

the plan is to build two fair sized full range rear loaded horns, using the following drive units,

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

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

i have previous experiance of designing a tapped horn for a eminence alpha 12 using a nice little program called horn responce.

i plan to crossover the drivers at about 3500hz to a yet to be purchaced tweeter

i am looking to design 2 speakers that go loud and sound great whilst covering40 (or35)hz to 20000hz

what i am looking for is some kinda DIAGRAM or a rear loaded horn and how each part relates to the IMPUT prahimiters in horn responce because im feeling abit stuck atm, maths isnt my strong point


im looking for a relitively simplistic design like one of the above

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

the wifi in this cafe is about to go down so i have to leave it as it is, any help with this and its feesabilaty would be greatly appreaciated, thanks

 

[hm]

Hello,
this driver would not useful for a horn,
the Reso/Qts should be more than 100,
the Kef has 49.

 

[picowallspeaker]

A tapered quarter wave tube would suit this driver ?

 

[Naudio]

why would it not be suited, could i not design the horn in such a way that the driver would be?

i thought these drivers would work well even if the compression ratio isnt to high

i took these drivers out of transmition line speakers and i realy had my mind set on making horns for em

any more opinions

 

[Scottmoose]

Fs/Qt has to be over 100 to work in a back horn? Twaddle. EBP (whether you use Qt or the more usual Qe) is at best a massive approximation. The KEF is a case in point. It just requires a large (very large, by contemporary standards) enclosure, owing to its middling Q & Vas.

 

[Naudio]

Ok so as it may be possible..

i would like to have a play and see what i can come up with

is there anywhere i can get a diagram of a basic rear loaded horn, with each bit marked to correlate to the input fields in horn response, so i can see what input field in the program = what part of the horn design. this would be greatly appreciated for me and anyone else looking to design horns, thanks,

i am expecting they will turn out fairly large this is not an issue was thinking kinda 1.2m high should give a horn path of 1/4wavelength of 40hz

 

[chrisb]

you might want to consider MLTL of some sort for these, or if you're bent on a horn 🙄, a BIB might meet worth a look?

 

[rjbond3rd]

Here's a BLH tutorial in HornResp:

http://www.diyaudio.com/forums/full-range/145972-blh-example-hornresp-pictures.html

 

[Naudio]

this guide looks like it will be very usefull, unfortunately im not online much, but thanks for the help. i will post updates of the design as soon as i can get online

 

[GM]

i am expecting they will turn out fairly large this is not an issue was thinking kinda 1.2m high should give a horn path of 1/4wavelength of 40hz

With a mass corner = ~2*25/0.57 = ~88 Hz based on published specs, you're only loading a little over 1/2 octave, so probably better overall to use a double bass reflex (DBR) alignment and save yourself all the extra design/woodworking effort.

GM