29hz to 32hz

[Bobby322 10+ year member]

My box is tuned low at 29hz and my goal was 32hz. I mostly play all of decafs songs, and I dont think they go under 30 often or only breifly. Will raising it up to 32 have an audiable difference for me?

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[Plottin4success 10+ year member]

I doubt you would hear much of a difference in a 3hz jump.

Maybe a tiny bit on the mic, but not to the ear.

 

[Bobby322 10+ year member]

I see.. but theres a big difference in port length. Im at 20.55'' with an 8'' port and 32hz calls for 16''.

 

[Bobby322 10+ year member]

bump...

 

[Qxxx4]

You wouldnt hear it, 4" isnt a lot of port length bud

 

[RAM_Designs 5,000+ posts]

What's making you want to change the tuning?

 

[Bobby322 10+ year member]

I don't think my music dips down to under 30hz so whats the point of tuning that low?

 

[RAM_Designs 5,000+ posts]

I don't think my music dips down to under 30hz so whats the point of tuning that low?

I prefer the lower tuning for a flatter overall response without a noticeable peak. Even though you may not have much information that low, having the box tuned lower will normally keep a smoother response that doesn't have an obvious peak in it like higher tuned boxes would. And even when you are tuned at 29hz, you're box will peak higher than that by about 5hz, depending on the application.

A good tool to use is winISD so you can check out the response curves of different box designs and see how tuning and box size changes the peak, location of the peak, and the drop-off below tuning.

 

[KHARPS 10+ year member]

I don't think my music dips down to under 30hz so whats the point of tuning that low?

I'm with you on that one. I've been tuned pretty low before and didn't like the lack of output above 45hz. I say go for it and cut the port down and see how you like it. The absolute worst thing that could happen is you have to buy another coupler and more aero tube.

 

[RAM_Designs 5,000+ posts]

In my truck, with a box for a pair of MJ-18's that was tuned to 32hz, I was still 6db up at 55hz than at 35hz. This was with the box designed to be flat from 30-60hz outside of vehicle. If anything I need very big low tuned boxes to give me a bump in the 30-40hz region. I don't get people who tune in the upper 30's and around 40hz...I guess it's cool if you're showing off certain songs but it can't be nice to listen to on a daily basis.

 

[RAM_Designs 5,000+ posts]

I'm with you on that one. I've been tuned pretty low before and didn't like the lack of output above 45hz. I say go for it and cut the port down and see how you like it. The absolute worst thing that could happen is you have to buy another coupler and more aero tube.

This also depends on the subs themselves, if they even are supposed to work well in a low tuned box. Also depends a lot on the box size itself, as well as port opening size. What sub did you use and what were the box specs?

 

[Qxxx4]

In my truck, with a box for a pair of MJ-18's that was tuned to 32hz, I was still 6db up at 55hz than at 35hz. This was with the box designed to be flat from 30-60hz outside of vehicle. If anything I need very big low tuned boxes to give me a bump in the 30-40hz region. I don't get people who tune in the upper 30's and around 40hz...I guess it's cool if you're showing off certain songs but it can't be nice to listen to on a daily basis.

My AQ HDC 18's sound better, even in the low range ( subsonic set @ 25), tuned @ 40, than they do @ 32. I dont know if its the design of the sub or what, but they just sound better tuned higher, Ive tried as low as 30hz tuning and you just lose alot of overall output when tuned low and lose the MONSTER kickdrum punches in the 45-50hz range that makes the AQ's so fun

 

[hatedonmostly 5,000+ posts]

I prefer the lower tuning for a flatter overall response without a noticeable peak. Even though you may not have much information that low, having the box tuned lower will normally keep a smoother response that doesn't have an obvious peak in it like higher tuned boxes would. And even when you are tuned at 29hz, you're box will peak higher than that by about 5hz, depending on the application.
A good tool to use is winISD so you can check out the response curves of different box designs and see how tuning and box size changes the peak, location of the peak, and the drop-off below tuning.

Then why not do a sealed box, because,

I'm with you on that one. I've been tuned pretty low before and didn't like the lack of output above 45hz. I say go for it and cut the port down and see how you like it. The absolute worst thing that could happen is you have to buy another coupler and more aero tube.

Isn't the point of a ported box to have a boost in a certain range of frequencies? Because if you're getting a flat response, the boost would be gone.

Oh and of course, with all the talk about "boost" in my post:

 

[Qxxx4]

^^ tran hit the nitrous, not vtec.

 

[hatedonmostly 5,000+ posts]

^^ tran hit the nitrous, not vtec.

Dude, it's real sad that you can't live without this site. How many times have you been banned and you keep coming back?