Plans for an SPL Box, optimum tuning frequency? Trying to pass 150dB

This is the first year for the class changes, the one you seen last year may or may not have been eliminated. Just have to check i guess. But they did introduce a couple more new ones
the last competition was in February which I attended. I know for a fact they haven't changed.

 
I've never heard of that, where is the mic placed and are the doors and windows closed during competition?
mic on passenger side windshield, car is closed.

Here are the listed classes

STREET - 1x15", 1 or 2x12", 1 to 3x10" ect

power is 1 - 2000RMS total @ any impedance

1x battery in non factory location (if needed), + 1x battery in

factory location.

No wall.

Music ONLY but not limited

vehicals MUST be road registered.

SUPER STREET - 1x18", 2x15" 3x12" 4x10" ect

power is 1 - 2000RMS total @ any impedance

1x battery in non factory location (if needed), + 1x battery in

factory location.

No wall

Music ONLY but not limited

vehicals MUST be road registered.

PRO STREET - 1X15", 1 or 2x12", 1 to 3x10" ect

power is 2001RMS to 4000RMS total @ any impedance

upto 2x batteries in non factory location (if needed), + 1x battery in

factory location.

No wall

Music ONLY but not limited

Vehicals MUST be road registered.

PRO SUPER STREET - 1X18", 2X15", 3X12" 4X10" ect

power is 2001RMS to 4000RMS total @ any impedance

upto 2x batteries in non factory location (if needed), + 1x battery in

factory location.

No wall

Music ONLY but not limited

vehicals MUST be road registered

UNLIMITED - unlimited power, unlimited subwoofers, unlimited batteries,

music or tones are ok.

Wall is OK

can be registered or unregistered BUT must be moved around with

own power. (CAN NOT be pushed or towed to lanes)

FOR ALL CLASSES - windows open or closed.

use of usb, SD or phone is ok provided the volume is controlled

by main multimedia unit.

Street,

Super Street,

Pro Street,

Pro Super Street - multimeadia units must be used in factory location

BUT can be controlled via remote from outside the vehical.

SEDANS/TRUNK - any sedan/trunk can run there subs in/on the back

seat of there vehical provided it does not protrude past the B pillar and

does NOT sit higher than the highest point of the front seats (head rest)

 
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RSDXzec

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