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,






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



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:

BLH example with Hornresp in pictures

[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]

Originally Posted by Naudio

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