All Around SPL


All Around SPL is an average musical division of ISPLL. All Around SPL is a 30 second average of any music source chosen by the competitor. The score is comprised of three rounds. Each round will be measured at the headrest, on the windshield, and in the kick to collect three scores that will then be averaged.

Class Matrix


Orange - Cone Area Restricted


1. Competitors are allowed to use publicly available music (no music with solid tones). They may use CD, MP3, iPod, USB, or any other source device.

2. The maximum frequency to be used is 70Hz. There is no minimum frequency.

3. Metering will take place on the passenger side windshield (legal position), passenger seat headrest, and passenger side kick (outlaw position). Only the driver side door OR window may be open during the rounds.

4. Any seat but the passenger seat may be removed during metering.

5. Cone area restrictions: T1 – <253” | T2 – <354” | NW1 – <354” | NW2 – <708” | W1 - <708” | All other classes unlimited

6. Maximum charging voltage for classes T1-3, NW1-3, and W1-3 is 15.5V and classes T4, NW4, and W4 is 19.5V.

7. There are no battery limits in any class. ISPLL believes that this unnecessarily restricts the ability of competitors to use their system fully outside of competitions (i.e. demo and daily usage).

8. Engine RPM should not go above 2500RPM consistently during metering.

9. Competitors are allowed 1 minute between each round to allow their system to recharge/rest. They are not allowed to change any part of the enclosure or equipment.

10. Competitors must wear hearing protection during metering if their vehicle exceeds 150dB.

11. All vehicles must be daily drivable (drive at least 50 miles on one tank of gas and drive the posted speed limit).

12. The NR class will ignore rules 2, 6, and 11. This is the No Rules class and shall only follow the general guidelines of a 4 wheeled form of transportation with normal equipment.