Whats on paper is sh*t for real world performance, metal is all about accurate double bass pedals and there is minimal group delay as long as you get the port area right. All there is is just a shift in the peaks of bass. 35 is way too low for metal imho. Legit absolute waste of time tuning that low especially for that pioneer sub that can easily do well with a 40hz tune in a moderate sized box.
It's not like that Jeff. Group delay is the phase shift that occurs between the port and woofer. Small box lower tune means less shift in more transient.
well i wouldn't suggest tuning below FS to much honestly
10.75" isn't deep enough. 7" sub mounting depth, the 4" port will be behind the sub magnet so need 1" clearance between sub and port. 4" port double that to keep it 4" away any walls. Then you have the thickness of the back wall material.
yeah that would work good 1 4" is good (models i did on mine i was little shocked the port velocity really low on that compared to fu) my slot box is 36hz and only about 11.5sq in port per cube, over powered still sounded good..
yeah, the ones with the small oval blue logo in the center with the light grey chassis that i personally saw all had birth sheets well over 700 consistently, I know those birth sheets dont really mean much at all, but those amps just put the power down!! I sold a ton of those. The alpine mrd-m500 right next to it on the display was like $150 more and did a bit less power. It did have a voltage meter right on the amp tho. Those were actually pretty cool amps, but i digress
Then use the dimensions I listed above- 22W 14H 14 1/2D with 2 3inch pvc pipes cut to 15 1/2 each. The box I posted on the first page was around 1.8cf tuned at 32hz for a Kicker CVX- your box would be a smaller higher tuned variation of that design. It works well, I have made a few boxes like that and they all sounded good and got plenty loud.
