Hey guys,

I'm just modelling a box for my new sub (IDQ10 D2 V.3).

IMP 1/4ohms
Re 1.025ohms
Fs 25.528Hz
Qes .47
Qms 2.1
Qts .384
Vas 71L
Xmax 19mm
Sd 399.1 cm^2
Splo 85dB

I'm going to be running it at 4ohms giving it 250Wrms for now (bridged off my 4ch amp), but ultimately will be running it off a monoblock at 1ohm with probably 500Wrms so I'd like to design my enclosure based on the latter case. Anyway I've put these parameters into unibox and decided that I'm probably best off with a sealed enclosure with a volume of 26.6L (excl sub volume) which gives a Qtc of 0.77. This keeps me just within my excursion limits (I think ). I was just wondering if someone would mind running the numbers and making sure I'm on the right track. I wouldn't mind going with a ported enclosure but the sub would reach full excursion for frequencies below 30Hz for no dB gain so I didn't think it was worth it. The purpose for this sub is for SQ.

Cheers

i would post this question on this forum first

http://www.imagedynamicsusa.com/forum/index.php

you have to register to post

Cheers for the reply. I have had a small look at that forum and there are quite a few threads which ask the same question but the replies are more along the lines of "go a sealed 0.75cuft to 1cuft. it'll be tops". I think the knowledge here is a bit more in depth. I'm pretty sure I got it right but I just wanted some reassurance because I didn't really have too much of an idea what I was doing in UniBox

mods, would I be able to maybe get this moved to the fabrication sub-forum. cheers

i will move this thread, no probs.

i've modelled the specs too, and a 'sealed' box that's around 0.75~1.0cuft is perfectly good. realise that there is no 'best' box; it is always a compromise. and what is modelled on the computer will not translate to that exact same frequency response inside the car; it depends on the car's acoustics and the amplifier and the position/direction it faces in the boot, and of course 'cabin gain' takes effect, boosting the lowest of subbass.

still, you can be more confident of a good result if it does model well on the computer. just that what was suggested on the ID forums is not 'wrong'; it should be true!

thanks for that shiny. I was pretty sure I got it right but just wanted to make sure as it was my first time using the program. Cheers