Section 4 – Judging Procedure
Overview

  • Every contestant shall qualify twice; once for SPL and once for RTA.
  • The contestant’s SPL score and RTA score shall be added to the contestant’s Installation score to determine the contestant’s Overall score.
  • Placement shall be determined by each contestant’s Overall score (SPL score + RTA score + Installation score). The contestant with the highest Overall score wins.
4-1 Sound Pressure Level Score (SPL)

  • The SPL score in Psychlone is comprised of two parts; Average SPL and Peak Frequency Bonus.
  • The Average SPL is simply the 30 second average SPL as measured by Term-LAB.
  • The Peak Frequency Bonus is awarded based upon the frequency where the contestant’s highest average SPL occurred. This bonus is determined as follows…
    • 80 Hz = 0 Points
    • 79 Hz = 1 Points
    • 20 Hz = 60 Points

Example:

Average SPL = 143 dB
Peak Frequency 35 Hz
Peak Frequency Bonus = 80 – 35 = 45 points
SPL Score = 143 + 45 = 188

The maximum Peak Frequency Bonus is 60 points. The maximum SPL score is currently 243 points (183 dB Max Term-LAB measurement + 60 Bonus points.)

4-2 Frequency Response Score (RTA)

  • Contestants shall use Pink Noise for the RTA measurement.
  • The RTA microphone shall be placed so that it approximates the driver’s ear location.
  • The output level of the system shall be adjusted until an SPL reading of 100-105 dB is obtained on the Term-LAB RTA analyzer.
  • The frequency response score will be calculated from the 30 second average RTA measurement.
  • The Term-LAB RTA analyzer will identify PRIMARY discontinuities within the frequency response of the system. (Band-to-band deviations in excess of 9 dB.) The primary discontinuity with the highest band-to-band deviation will then be determined. The actual deviation at this location (in dB) will be deducted from the RTA starting score of 100 points.
  • The Term-LAB RTA analyzer will identify SECONDARY discontinuities within the frequency response of the system. (Band-to-band deviations in excess of 6 dB.) The secondary discontinuity with the highest band-to-band deviation will then be determined. The actual deviation at this location (in dB) will be deducted from the current RTA score.
  • The Term-LAB RTA analyzer will identify all band-to-band discontinuities exceeding 3 dB (excluding the primary and secondary discontinuities, if any). One point shall be deducted for each of these deviations.

The maximum RTA score is 100 points.

4-3 Installation Score

Ten points shall be added for each of the following…

  • Aftermarket source unit in use
  • 5-Band or greater equalizer in use (stand-alone or integrated)
  • Active crossover in use (stand-alone or integrated)
  • Appropriate power wire size for amplifiers
  • Power wire(s) fused within 24 inches of the car batteries
  • Custom trim panels OR completely “stealth” installation
  • Subwoofer enclosure present
  • Aftermarket front-stage and rear-fill speakers present
  • Aftermarket amplifiers present
  • All equipment installed securely

The maximum Installation score is 100 points.