I have a JL 10W6 with a 500/1 amp, recently built a custom enclosure with 1.89 cubic ft internal vol and tuned it to 31hz. It sounds really good but I'm wondering if I can improve on it and flatten the curve on the graph out a bit to get a little more SQ. Looking for a bit of advice.
Box is 38W x 13H x 10D, Port height 11.5 length 22.75 width 1.5 then 2.0 at port opening (L shaped port).
Looking at the graph in Winisd at +2 db 60hz +3 50hz +4 at 40hz peak, then the curve goes down to +0 at 30hz and drops off.
The sub according to JL is 28.5 hz FS.
In building another box (I have enough materials) some questions.
1. Is it okay to tune the box lower to 28 to flatten the curve and not have such a high peak 40hz, +4db seems a bit high to me.
2. Using a longer port with the same size enclosure to get to 28hz will drop my internal vol to around 1.5 or 1.6. Is my current 1.8 internal vol box too big for the sub and would I be better off at 1.5 or 1.6?
3. Is it safe to tune the box for the 10W6 to 28hz with subsonic filter set to 20hz? Looking at Winisd graphs at 28 hz I have a flatter curve with +3db at the peak across a broader freq range.
4. Port width, 1.5 (jl site recommends) but I have been told to go larger to avoid port noise. 1.75, 2.0? Recommends?