HD15 Driver Sims

cheers dave, this is a great resource!
have you modelled the horn 'straight-up' or have you somehow compensated for the resonant component of the cabinet? i'd be very interested to know how if so - ive always felt an ordinary horn expansion model wont quite capture the magic of the bin. theyre just that bit louder than they reasonably should be innit? ;)

so what are people's opinions?
whats the new best bet when it comes to driving everyone's favourite short horn?
there's some 'unknowns' in amongst that lot that look very promising. interesting stuff

although it has to be said, one of the most important considerations for a bin with the impulse of an hd has to be the responsiveness of the driver, and this doesnt show up on the plot. some of those fanes look like they should sound great, but in practice they'll end up sounding all mushy

i don't use a batten round the mouth, which is one reason i get a bit more sub than most people seem to with their hds. im also very into sneeky corner loading, stabbing other peoples drivers up with a screwdriver and other such dirty tricks :D

when you approximated the curve, did you plan the new panels so the edges where they meet are on the circumference of the curve, or so that the midpoints of the panels are on the circumference. or somewhere in between?
it makes quite a difference, because the first will decrease RC volume and widen the horn path, while the other will do the opposite. i should really start to build mitred boxes, its sooo much less effort.

ive always wondered what would happen if you made an hd with a conventional expansion instead of a radiused curve. could never tell whether it was laziness on rog's part to design it like that, or a genius trick that the rest of us dont know about - neither would surprise me :P

i wonder whether rog's plot also ignores the bandpass magic factor. maybe i'm biased but ive always loved hybrids, im sure theres something going on that hornresp can't account for...

Edited by loophole - 17 November 2005 at 7:04pm

Even given that there may be funny room modes going on with my plots, i think the bandpass element adds quite a lot to the sound.  The sims show a peaky response with my measurements a lot flatter and lower before rolling off.  I did a number of different measurements with the mic at different positions before settling on the one i did but i can say that the rest were all fairly typical of what you see there.

I can also say that the first time i heard 8 of Dom's together it was whilst setting up a DnB night and they were certainly belting out the bottom end (whether i was really hearing the fundamental is cause for discussion tho..) so i'd say that his plots for multiple cabs also doesn't necessarily represent whats going on.

I'm running 6 next saturday (plus 2 double 18 subs) in the basement bar at the Stratford Rex (if anyone knows the room).  I'm expecting it to be fairly intense in that space, especially as the stack only goes under the roof with 20mm to spare.  Anything i should consider with reflections off the roof with the top end horns that close?

ok i have two drivers for you: the orion 15 inch sub in the H2 series, by orion audio, and the 15 inch madison executioner speaker.  those two have the highest xmax ive ever seen, very much worth simulating (ps i hate troubling people for this sorta thing, im curious what program you use so i coudl do it myself...)

please , can you simulate eminence kappa PRO 15 LF ?

Bit More on the FTR15-4080FD