Hi Guys,

I'm turning to you for some assistance in designing a box for two 12" Hertz 300 subs. I did build a sealed enclosure as per the recommended specs but find the sound "messy".

The sub specs are:
D mm 253
Xmax mm 14
Re Ohm 2,9
Fs Hz 33
Le mH@1kHz 1,83
Le mH@10kHz 0,56
Vas lit 49,62
Mms gr 167,1
Cms mm/N 0,13
BL T-m 13,57
Qts 0,47
Qes 0,53
Qms 4,40
Spl (1m/2,83V) dB 90

The max outer dimensions of the area in my car are:
Width - 31"
Height - 16"
Depth - tbd

I'm hoping someone could offer a ported/vented design.
The subs will be powered by the sub channel on my 5 channel amp, Audison lrx 5.1k

Thanks in advance