ISQC (International Sound Quality Challenge) is a format that is judged in the same fashion as SQC from both front seats (driver and passenger).
Usually found at larger events, ISQC Judging is done by teams of Domestic and International judges using the IASCA Sound Quality Reference CD. The judging teams judge each vehicle and score the vehicle based on the Official IASCA Sound Quality score sheet. Then, the scores from each team, for each vehicle, are combined together to determine an average score; the competitor with the highest average score is declared the winner.
