advice needed on two fi sp4 15s

[that1dude]

more like 30-32hz

that would require a slightly larger box correct because of increase in port area with lower tuning would make a longer port and need a bigger box

[Smoove]

3.5-4cubes per is easily doable per sub

[that1dude]

3.5-4cubes per is easily doable per sub

what should the port area be in your opinion buddy. ?

[Smoove]

I'm not sure when you say daily and possibly meter.
I will use my box as and example. 2 sp4 15's tuned to like 31hz 8.2cubes 126sqin of port. I hammer 30-42hz on an sundown scv6k. Play down to 26 easily. But when I try to play some higher early 90's bass notes, it's a fail. Yes I'm mad I can't play those higher notes

I am still trying to understand your goals

[that1dude]

I'm not sure when you say daily and possibly meter.

I will use my box as and example. 2 sp4 15's tuned to like 31hz 8.2cubes 126sqin of port. I hammer 30-42hz on an sundown scv6k. Play down to 26 easily. But when I try to play some higher early 90's bass notes, it's a fail. Yes I'm mad I can't play those higher notes

I am still trying to understand your goals

i was hoping to hit like 150db on music and still have a decent flat response but what your describing is what i was hoping to minimize losing on higher notes,

i listen to a lot of different music new and old, rnb ,rap, rock, i just hate stupid county crap. maybe 34hz tuning would put me more in the middle for over all response possibly?

[Smoove]

You may have to built a couple boxes to find what works in your ride. We can't predict cabin rise or vehicle peak.
When you say 150 on music are you metering Dash, kick, or headrest ?

[redbaron80]

I'm tuned to 26, you will love it!

[that1dude]

You may have to built a couple boxes to find what works in your ride. We can't predict cabin rise or vehicle peak.

When you say 150 on music are you metering Dash, kick, or headrest ?

just metering at the dash. ive went as far as plotting the design out in bass box 6 pro the get a look at the output curve along the frequency i want best response at minus cabin gain of course but the main issue Ive been contemplating is the port area issue. i hear 126sqin that's about 60 per sub, then i read several other post and info on other site that for a sub with 33mm xmax i need more port area. i was about to stick with 144sqin port area when i made the post but i am unsure now.

[Triticum Agricolam]

I'd probably run closer to 180 sq in or more of port area, but I'm a port area whore.

Since you already have your design in BassBoxPro you could see what it tells you to use to keep port velocity under 30 m/sec, even lower would be better.

[that1dude]

I'd probably run closer to 180 sq in or more of port area, but I'm a port area whore.

Since you already have your design in BassBoxPro you could see what it tells you to use to keep port velocity under 30 m/sec, even lower would be better.

i would but bass box 6 pro apparently has a stroke when i set it for a 1inch port and use more then 144insq of port area like it cant calculate it blow 36hz . the net cf box turn blank and it refuses to plot. maybe i have made a mistake or maybe bb6 is biggie idk but here are screen shots of the stroke bb6 has on me.

take a screenshot

take a screenshot