Ok trying to figure out a nice design for a ported enclosure for a 9512e...
Im trying to make an SQ oriented box here by the way.

Im thinking somewhere around the 50L mark, with the port tuned fairly low, maybe 28 - 30Hz?

Would this be any good in terms of sound quality, and what could I do to improve it?
Im using WinISD to design it (first time using the program). Id kinda prefer to do as much as possible myself... I dont see the point in setting yourself on a learning curve if you get someone else to design it for you
So far it looks like Ive managed to get a fairly smooth response curve from it... Should I try to make it peak slightly anywhere? Currently it dips a little at between 40 and 50Hz, after peaking slightly at just after 30Hz. I listen to a pretty wide variety of music, everything from rock to rap to dance and trance to metal and almost everything in between, if that helps?

So Im basically just looking for advice in terms of whether Im heading in the right direction or not...


Also, what sort of port is most suited to SQ if any? Slot? Round? Something else?


Sorry, one more thing, Im planning on having 2 ports if possible. Im planning to have the sub mounted inverted on top of the box with two ports firing at the back of the car. Would this be reasonable?


Luke

What you want is a great sounding, musical box. The definition of "pure SQ" is often a bit skewed.

Of course you want a great sounding box, great sounding and high output can go together. This does not make it an "SPL" box!

The SQ purists will tell you that you must have a box that plays flat to 20Hz or below, when the reality is that virtually NO music is recorded below 30Hz. Only the lowest notes of a pipe organ dip down there.

The lowest note you'll ever encounter in normal music and even movie explosions is around 40Hz.

I wouldn't recommend sacrificing half (or more) of your potential output in the exciting 40-80Hz range, just to be able to produce high output at a frequency you'll never play. It just doesn't make sense.

I'll design you a box that tunes at 30Hz and 40Hz so you can have a listen for yourself. Shoot me an email with some dimensions of your car, I'm happy to help.

Phil

Ok, Ive made the box a little bigger and upped the tuning frequency.
This is what it looks like at 60L ported to 36Hz...



Would that be sounding ok?
(Appreciate the help but as I said Id like to design it myself if thats ok )


Luke

I wouldn't rely too much on the factory specs as they're not complete (no voice coil Le) and not terribly accurate anyway (the listed 1w-spl is at least 6db optimistic) If DD phil has a design known to work with them then I would go with that, no point wasting your time modeling with in-complete/inaccurate data.

Uhh...
http://www.ddaudio.com/dd/caraudio/woofers.asp?series=9500f
I think youll find the Le of 0.9mH on that page...

So the speaker apparently has around an 83dB sensitivity... Are you sure of that? How do you know its at least 6dB less than the stated 89dB? If youve tested it then fair enough, if not, how do you supposedly know that?


Luke

Also, the problem is that that software doesn't take the car's acoustics into account.

I'd go 2 cubic feet tuned to 40Hz.

Phil

PS: Sensitivity, 83dB, where did you pull that figure from? Do you think we'd own most of the World Records if that were the case?