Box tuned to 34hz, peaks 38?

[Shigshwa]

I built a box for my SP4 15 that has 4 cu ft, tuned to 34hz. When I use WinISD, it says the box peaks at 38 hz. When I meter in my car, I get the highest spl at around 40 hz. I know that this curve only applies outside of a cabin, but would this mean that the sub will start unloading at 38 rather than 34? What would cause this? Ignore the green line, mine is the blue line.

[Katt]

I believe around 38-40hz is what your resonant vehicle peak is, where it would be loudest.

And if what i heard, was you can tune to 34, and play 3-5 hz below box tuning, and be okay. Unless im thinking of something else. I may be wrong on all this, if so i apologize.

[Kyblack76]

Lol.

Jesus. ...

[purplesyrup]

Box is fucking too small end of thread

[purplesyrup]

4 cubic feet sp4 15 rofl

[purplesyrup]

Hahahahahahahahaha

[baron_of_bass]

Just because you tune your box to 34hz doesn't mean that's where it will peak. It will be loudest where your vehicle peaks.

[zack_e89]

4 cubic feet sp4 15 rofl

I don't know anything about Fi subs...

SP415

DUAL 1 | DUAL 2 Fs: 27.6 Hz | 27.9 Hz Re: 0.65 Ohms/coil | 1.27 Ohms/coil Qms: 6.56 | 6.45 Qes: .52 | .52 Qts: .48 | .48 Mms: 434g | 424g Cms: 0.77mm/N | 0.77mm/N Sd: 810cm^2 | 810cm^2 Vas: 70.4 l | 70.4 l Spl: 86.4dB 1W/1m | 86.5dB 1W/1m Bl: 13.7 N/A | 19.1 N/A Xmax: 33mm | 33mm Rms: 3000W | 3000W Sealed box: 2-3.5cuft | 2-3.5 cuft Ported box: 3-5cuft | 3-5cuft Sub OD: 15.625” | 15.625” Cut ID: 14.125” | 14.125” Mounting depth: 11.250” | 11.250” Displacement: 0.21cuft | 0.21cuft

[purplesyrup]

Good luck on a 3 cubic foot box

[purplesyrup]

I will pray for you