Here you go, PV. One of the best group delay plots one could hope for regarding a vented enclosure. Not a very conventional design with about the same excursion as a sealed enclosure, except for right at tuning, but extremely well behaved overall. This is the driver that I had you double check the math for, concerning the parameter extrapolation. It doesn't get very loud but it has bandwidth. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
Yes, that is the system response. Both drivers in 2cu.ft. net with 2000 watts applied will yield those results. It seems small because lots of guys who are just going for numbers build large enclosures to keep vent dimensions manageable (short) but they do that without regard for optimal performance in other areas such as peaky frequency response and a lowered mechanical power handling at frequencies not supported by the vent, which is what you experienced. Other enclosures that are designed properly and are still large, are most likely the result of a driver that has a large Vas. The BL product for your driver is pretty high and the Vas is pretty low, as is the Qts. That all adds up to a small enclosure (and a long vent for low tuning, PR's rule!). Your enclosure will still be sizable due to the fact that you'll need to factor in the displacement of the vent (.79cu.ft.). You can safely throw 3200 at this system (flat) without much concern for over-excursion until you get down to around 25Hz. Be sure to use your SSF if you intend abuse them.
haha..yea...and claimed he spent $130 on the first enclosure:wow: sorry but i would've capped the first one and relocated the sub...if any depth issues the double baffle from capping it should suffice or throw a ring on there for clearance..cheap solution...not 60 more for a design..lol
Sweet!//content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif
Nope, you can't just cut the volume in half for this particular situation. I mean, you can, but you won't get the same smooth response and you'll have an even longer vent. Two drivers sharing a common volume with a single vent is optimal. If small size becomes a priority, I would certainly go with a PR setup or a sealed enclosure. I can't recommend a specific PR alignment unless I know the Vap, Cms, and Sd of the PR you use. Generally, the lower you tune, the more PR you need. If you were to go sealed, I would get a driver that will work better in that scenario. That's just me though.
So what steps would i take to build a box for just one subwoofer? Im guessing that most people simply dont care how there bass sounds cuz nobody seems to take this much effort in designing boxes.
Yep, lots of guys are simply going for output so they use as much vent area as they can and to keep the vent length down they go with more volume than is needed. Might be loud, but it's certainly not accurate and it probably exhibits poor cone damping and a hollow sounding character. Everyone's mileage will vary and there are some clever solutions that go against the usual logic so I'm not addressing those individuals who know exactly what they're doing with regards to very specific custom installs. I'm describing those individuals who tend to "design" and build enclosures to have a certain tuning and then attempt stick any old driver in there and can't understand why something just isn't right.
Having said what you did above im guessing i can kiss my 145's good bye?
No, I would never let go of your aspirations of getting over 145, it's certainly possible. I would just go with someone else's guidance to achieve that.
