Do you supply the bullets? I can get a 12 gauge. Nah, WTF is drive by shit? Like, you want me to drive by with windows down playing full tilt? I have only competed in spl with car parked. idle at 1200rpm. So Brohamman, explain.
Ya yay, I should know this, but I am deaf and dont pay attention to shit when at comps. just looking for tits //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
MECA > SPL > Drive-by SPL
“DRIVE-BY SPL PARADE” - Intended to be a format for all daily driven vehicles to test their ability to impress listeners as they drive by on the street, measuring SPL outside the vehicle.
5 “Drive-by SPL Parade” “Pressure Classes”
DB1 0 - 550
DB2 551 - 1000
DB3 1001 - 2000
DB4 2001 - 4000
DB5 4001+
A. Vehicle/Owner Requirements
1.No one may be in the vehicle during pass. System must be operated by remote, external head unit, or podium.
2.Vehicle is to be driven into the lanes and parked. Vehicle may not be put in reverse or re-positioned once it begins the approach into the lane.
3.Once parked the Competitor has two (2) minutes to get out of the vehicle, shut the door, set-up, and begin their official pass.
4.Once the pass has started, the doors may not be opened, the pass will be disqualified.
5.As long as they are properly wearing hearing protection and their head remains outside the vehicle, the Competitor may lean in the window to adjust volume, change, or pause the track but may not manipulate any other equipment nor change fuses.
B. Judging Criteria
1.Windows may be open. Windows in front of B-pillars may be removed. Doors, trunk/hatch, and hood must be closed. T-tops may be removed; sunroofs/moonroofs may be open or removed (if designed to be removed without tools), convertible tops may be down. Soft top vehicles will be considered convertibles.
2.Competitor must play musical track(s), (i.e. songs) in which the bass notes vary and are not sustained for the entire pass. No tones, sweeps, and/or bass only tracks. The TermLab “spectrum analyzer” will be displayed and used to determine that bass notes are not sustained.
3.Competitors must use commerically available music tracks. Burnt CD’s, iPods, MP3 players, etc. will be allowed at 1X, 2X, and 3X contests, however, at MECA World Finals ONLY original mass produced CD’s may be used.
4.Competitors who opt to use a CD Changer or Multi CD head unit must remove all other CD’s to ensure that the Judges are able to verify the CD being used for their “Drive-by SPL Parade” test.
5.Competitors may only use one source unit during pass. The Mids and Highs being played must be from the same source as the bass from the subwoofers.
6.Mids and highs must be able to be heard outside the vehicle.
7.Lyrics in song may not include any foul or offensive language.
8.No bracing teams allowed
9.Peak frequency must not exceed 100hz, as verified by TermLab metering system.
C. Sensor Placement
1.In addition to the General Rules, sensor will be placed 72” (6’) from the outside edge of a marker on the ground (usually a cone), on passenger side of the vehicle; 54” (4.5’) off the ground on MECA approved stand.
2.Competitors who hit the marker either entering or exiting the judging lane will have their pass disqualified. In the event of a minor hit (i.e. running over the base of a cone) the competitor may be granted a retry at the Judge’s discretion.
D. System Requirements
1.For DB1, DB2, DB3, and DB4 there are no modifications to the front of the vehicle with the intent to increase sound pressure level score, except for the modifications outlined in D.2. through D.9. As an unlimted class, DB5 will follow sections A&D of the Radical X Rules and allow Radical X vehicles which still meet sections A and B of the DBSPL Rules to compete in DBSPL.
2.Enclosure or anything attached to the enclosure cannot extend more than one inch (1”) past any part of the front door jambs, except in a standard cab truck where it must fit with the driver’s seat in the most forward position.
3.Door panels may be modified, rebuilt, removed, or built out (3/4” maximum).
4.Headliner may be removed or replaced, but may be no thicker than 3/4”.
5.Dash modifications are limited to mounting of; automotive gauges (i.e., tach or voltage gauge), for video system components (i.e., screen(s), DVD player, game console), relocation of source unit, and/or mounting front stage speakers for SQL applications.
6.Dash may only be recovered with a cloth type material. Painting to match a color scheme of the vehicle will also be allowed.
7.Only rubberized/asphalt type sound deadening material is allowed to be used on the floor in front the B-pillars, 2 layers maximum in any area.
8.Vehicle must have automotive seats in the forward only position. Both front seats must be properly mounted in the vehicle. Seats may be replaced, providing they are still a DOT approved automotive seat; no homemade, marine, or other types allowed.
9.Standard Cab Pick-ups: If aftermarket seats or factory replacement seats are added, and the factory brackets aren’t used, then the brackets to hold said seats down must be made to line up with the rear factory bolts as to not increase the area behind said seats.
10.Center consoles may be removed or rebuilt as long as the design does not intentionally redirect pressure, which may increase SPL score.
11.Upgraded electrical & charging systems allowed. Unlimited batteries, capacitance, alternators, and voltage allowed.
12.Batteries must be securely mounted, and must be located either under the hood and/or be mounted anywhere behind the B-pillars, within the original skin of the vehicle, or be mounted under the vehicle in a battery box. Battery box may be a separate unit mounted under the vehicle or be installed through a hole cut in the floor. Battery box must provide protection from the outside and may not hinder the vehicle’s ability to be driven safely.
-Some unique situations may arise that disqualify vehicle, system, and/or competitor from “Drive-by SPL Parade” Format, determined by MECA judges.
