Kicker 750.1 amp...what kind of subs/box?

Good news, it turns out my dad had a circle saw and folding table from the 70's... and they still work lol. The 7.25" 20 tooth rusty blade needed to be replaced though. I got a 140 tooth.

 

Nice. Now I just need to find something that can cut a clean circle.

Oh yeah, I was just thinking, say I built a box, and the internal volume was 5 cubes. Then I wanted to subtract the port displacement. When I do that, am I subtracting just the volume the plastic tube takes up? Or the plastic tube and the air inside of it?

 

Ah, damn, so I have been doing it right lol. I was hoping I was wrong and I'd come to find out a pvc port would take up pretty much no volume. Oh well.


Hey, would it be okay to have the ports on the sides of the box?

 

The reason I ask is, you want to keep the port at least 4" from the back wall of the box, right?

I was told that if I do a common chamber box I should try to get 50 sq. inches of port area... well with a box 43" wide, 14" tall, and 18" deep, a square port that's 7"x7" needs to be around 18.25" long to get a 35 Hz tune, so obviously that won't work.

I can do a 6"x6" port that's around 12.75" long... but that's only 36 sq. inches of port.

 

Hm...

WinISD tells me that 4.5 cubes tuned to 35 Hz requires two 6" round ports 22.71" long... the box is only going to be 18" deep.

 

I can do 4.5 cubes at 40 Hz with a port 7"x7" and 12.86" long.

 

What tunes do you think I should make for the interchangable ports?

A guy on the lowrider site suggested I get a $50 spl meter from radioshack, make a sealed plug for the box, and see what frequency my car plays loudest at, then make a port that tune.

 

Maybe I said it wrong lol. I don't know. This is what he said...

GUY: "honestly I wouldnt bother with port plugs...... but if you want to do that you should tune one to peak at ur vehicles resonant frequency.... you can use a sealed bos and an spl meter from radio shack to figure that out"

ME: "Are SPL meters expensive? When I went on radioshack's website they had a couple for $50 but they only measured up to 126db."

GUY: "you dont need one that will read over 126db for this application.... all you are trying to do is find the loudest frequncy inside your car. Once you know what it is you can tune a box to peak at that freq for spl competitions."


And just for a little background on the guy, just for ****s and giggles, he said this in one of his little internet tiffs lol...

"Chump I could careless about what your "world finalist" friend (probably pete or tuan) has to say about me. I gave up DB Drag and USAC several years ago to concentrate on other things. Dont get it twisted and think I didnt do well because I was a 2x DB Drag and USACi world finalist/invitee, with a certified 170.5 in ss1-2 and consistant 168+ all season long. People that were active in DB Drag on the westcoast and pac nw from 99-04 know me quite well. The last competiton system I designed and installed ended up being the points champion in streetmax 1-2, rookie of the year and got a 5th place at DB Drag WF's with 1 blown sub so you do the math. So keep runnin ya cumcatcher rookie and tell your "friend" I said hello."

 

Ah lol.


Well kind of random... but if you were to build a box for a single 15" alpine type r sub, 3 cubes ported to 30 Hz, what port area would you want?

(going in the bed of an 89 s10 with a camper)

 

Okay, the guy said he wanted some plans for a box 3 cubes tuned to 30 Hz, so I made some plans with 49.5 sq. inches of port.

 

I told the guy you recommended 4-5 cubes at 35-40 Hz with a lot of port area...

EDIT: Azn, a guy wanted to know what vehicle that setup your friend has was in? if it was trunked or walled?


but back to the CVR's lol...

the SPL guy suggested for a daily setup I do a common chamber with 4.5 cubes tuned to 33 Hz and 50 sq. inches of port, does that sound good?