Bryan90

1) is 1 cu ft good after all displacements? I'll be over powering it alittle 2) how much port area? I'm tuning between 30-33 hz?

Does anyone have any experience with them. Specifically the ZAPCO ST-4X. I would post a link but I don't know how.

Do you like it? Is it a quality amp like the other zapco amps?

What kinda upgrade would I need to run a saz2500d v1. I know a ho alternator but how big of a alternator and would one battery be enough

I have 2 sa 12s in a ported box and I've been thinking of trying to build a 4th order or just buying some sa 15s and building a ported box for them. So my question is could the 12s be louder in a 4th order than the 15s in a ported box tuned to say 30hz? They would both be ran on a saz1500 and space isn't an issue for either and they would be ran in the same vehicle

Oh and what the teddy bear for?

Did you make that. That pretty much simplifies it thanks

I use the port calculater on car stereo.com which I assume is very similar to the 12volt.com one but I'm kinda confused so if I 3.7 cubes and want to tune to 30 hz and I come up with 30in of long at 7.5 round that changes the cubes of the box size so do you just play with the numbers til you get the right cubes for that tuning or is there a easier way that I'm over looking

I know about the ssf. It's never bottomed out that's why I don't use it but on the saz I definatly will I'm going to lower the tuning back to 30hz cause that's what sounded best to me. I actually figured the double baffle in to the measurements the box is really 32 x 21 x 16 but the top and side are double baffled. I actually bought the subs on Craig's list and the " custom" box they were in sounded like shit so I made it smaller and tuned lower and it sounded a lot better. How do you calculate port displacement?

The output is good I just want more. I'm currently running a ppi p1000 but I just bought a saz 1500. I'm waiting on that and my ssf is set to 20 or 25 i don't use it. My lpf is at 45 to 50 and I set my gains by ear cause I don't own or have access to a o scope

Round my bad and it's subs up port to the side there in a ext cab Silverado

20in long

7.5 in

It's 3/4 in mdf 32 width 15 1/4 height 20 1/4 depth

I have a general idea. I just can't for sure say a exact number and I will measure it when I get home and post it

I got the net from a kicker u app length x width x height and I kinda guessed on what the net is from the displacement of each sub and what I think is the displacement of the port but I made this box awhile back so I don't remember exact numbers plus I I'm not a math wiz so i don't know how to figure out the ports displacement anyways

Oh.. Yea that's how

I'm at work so I can't get the dimensions but I remember it being around 3.8 cubes after displacement. I use a rubber weather stripping and just bolt it on. It seems to work I can't feel any leaks

That's kinda what I was thinking I might as we'll try. So your saying for 2 12s 2 cubes sealed and between 4-6 cubes ported. What would be the benefit of going with 6 cubes I want to be able to play 25hz to atleast 40hz.

I already went from 30hz to 36hz and currently 45hz port... High tuned ports aren't really my thing I like my lows

In this thread I was wanting to know if it's worth my time to try and build a bandpass for the 12s or just save up for 15s but overall just a loud daily setup

Yea I want to build a bandpass I'm just used to referring to them as 4th orders but I have a decent knowledge of box building. I've built multiple ported boxes but never a bandpass but I've been reading about designs and different ratios. I believe the hardest part is tuning. I've built my last couple boxes with interchangeable ports so I could do that to test out which frequency would work best for me.

I thought 4th order were suppose to be louder or is it more about having a broader frequency range but equal output? Idk that's why I'm asking