Originally Posted by LTD02
dayton indicates a q=0.707 in 3 cubic feet sealed.
winisd indicates a q=0.81 in 3 cubic feet sealed.
in 2 cubic feet, q rises to 0.89 with an f3 of around 33hz, which is still probably fine for a typical car install.
the frequency response is pretty amazing. +/-2db up to around 900hz. might make for a nice little sub to go along with some "cube" style full rangers that require a very high crossover point.
I am looking for a 3rd subwoofer following the geddes method, I had the 12" Titanic Mk III on order late Dec-2012, they gave me a Jan 6 ship date, then pushed that back to Feb-28! So, I needed to select a different driver.
I did same modeling as you, posted in the Parts Express Q&A
and got the below answer from a Parts Express staff.
Using actual measured specs Bassbox gives me a total sealed volume of 1.94 cubic feet for a Qtc of .707 and an F3 of 37.5 Hz.
Technical Knowledge: Professional
2 days ago
- Springboro, Ohio
Which makes this seem perfect for a 3rd subwoofer in my multi subwoofer approach, my IB sub and 18" SI D2 both have q in low 0.7 range...
I called PE, speaking to their tech support on phone he said the 12" Ultimax would be fine in a 2 cu ft sealed box for my HT usage, so I placed the order, he gave me same price as the 12" Titanic Mk III (A $12 "save")
I got them last night, un boxing shot, the Kevlar 12" cone looks sweet, while the 18" is simply BIG.
Now, I'm having 2nd doubts, the simulations we did vs what he did are so different ....for what I'm using the 3rd sub for as a replacement for out of stock 12" Titanic Mk III should I have picked the 12" Reference HF, or will this 12" Ultimax DVC Subwoofer do the job?
Based upon his simulation it appears perfect match.
For 3rd sub I'd like to stick with "small" box, up to 2.25 cu ft.
The "actual measured specs" the PE staff used, I'd like to see those for modeling, does anyone know where he could have gotten them from? Any why the spec sheet would not be updated with them if so?
For sure I will call PE later today.