I have a Eclipse 87101.4 10" SVC Sub that I would like to build a ported box for. I've always ran sealed boxes because they are simple. I have some MDF and 3" pvc laying around left over from a repair project so why not.
The issue im having is a lack of info about this particular sub. I no longer have the manual (if i ever kept it) and i can only find 1 sales brochure online about this sub. It only listed a few t/s specs. This sub is marketed as "For small sealed enclosures". I used to have it in the WinISD spec'd 0.587ft3 sealed box with 200w and was never pleased with the sound. It was very.. peaky? it would kill 60-100hz but like the graph shows it would drop off sharply below that. Using a real music example the opening bass line in U2's With or Without you would take your breath away.
This will be going into the cargo area of my wife's Nitro, and powered by the bridged rear channels of a PPI 900.4 that is rated at 450x1 @ 4ohms, at 14.4v. 300x1@4ohms at 12v. The sub is rated for 300wrms. My wife will listen to just about anything, so im looking for something that will be well rounded, not suited for any one type of music.
I tried to plot up a ported box in WinISD and I came up with 1.132cu net @28hz. 3" vent 18.85" To my unknowing eyes the graph looks very flat from tuning right up. This looks to me like a very good fit. No peaks and nice flat should make it easy blend into the rest of the sound stage. Also because it's flat i think it should be fairly musical.
So after all that, here are the questions. If someone more experienced in box designing could take a look for me i'd appreciate it.
1, Am I actually barking up the right tree? or am i out to lunch?
2, Sub and port location. The box will be behind the rear seats. Im thinking down firing sub and rear port?. Down fire to protect the sub more then anything and rear firing off the hatch. How you you do it and why?
3, I understand that i have to add the port volume to the box volume but what should I allow for sub displacement? This is only a 10" but it was fairly beefy for it's day. 0.05cu?
4, Any questions that im obviously missing?
These are the T/S specs that I have found
VAS 0.85 cuft
Xmax (One way) 0.73" (19mm)
Thanks for reading my wall of txt.