how do you tune a box?

[seattlejoe 10+ year member]

I'm building a ported box for 2 12's and I have a couple questions before I build it this weekend. It's gonna be about 5cf and i want to tune it to about 24hz. should i separate them inside the box? should i use square ports or circle ports? thanks

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[95volvosx 10+ year member]

why are you tuning it so lowww

 

[seattlejoe 10+ year member]

i guess i dont have to

 

[JimJ 5,000+ posts]

28Hz is the lowest I'd do for daily use...no real point in tuning lower, unless your playlist consists entirely of Baroque organ pieces it's not needed, and the vehicle's transfer function will help out with the bottom octave anyway.

 

[95volvosx 10+ year member]

28Hz is the lowest I'd do for daily use...no real point in tuning lower, unless your playlist consists entirely of Baroque organ pieces it's not needed, and the vehicle's transfer function will help out with the bottom octave anyway.

this man does know what he's talking about

 

[tcguy85 10+ year member]

most people seem to tune to around 32-35 for a mix of spl and sq. mine is at 34 and it gets loud and still sounds clear.

 

[phantom240 5,000+ posts]

28Hz is the lowest I'd do for daily use...no real point in tuning lower, unless your playlist consists entirely of Baroque organ pieces it's not needed, and the vehicle's transfer function will help out with the bottom octave anyway.

Could you explain in a bit more depth? I tuned my box to 29hz, mainly to improve SQ and lower the group delay of bass frequencies. Is there anything wrong with tuning low as opposed to say 35hz?

 

[mlstrass 5,000+ posts]

OP what subs are they? They probably have a recommended box size/tuning frequency?

 

[Diplexers 10+ year member]

with a tuning fork!....jk

IMO I like it in the low to mid thirtys. Gives tremendous lows with good higher response.

You might want to tune a couple hertz higher than their resonant frequency.

 

[phantom240 5,000+ posts]

with a tuning fork!....jk
IMO I like it in the low to mid thirtys. Gives tremendous lows with good higher response.

You might want to tune a couple hertz higher than their resonant frequency.

Ah... so tuning lower will make it roll off in the upper range harder? Because it rolls off after 80hz like a mothafucka. The subs were fantastic in my old sealed box... but now theyre loud as shit on rap and some rock.

 

[seattlejoe 10+ year member]

How do you determine what a box is tuned at?

Say I have a box that is 5cf with two 3in ports that are 12in long what kind of fz would that be?