The FREQ dial, the 80hz marking is at this location on my amp. I saw pics online that show the same as mine but others show the 80hz marking being on the left. Going by the 32-320 markings, 144hz should be at 12 o clock so 80hz should be slightly more than half way between 32 and 144 right? Can I just turn it to 320 and use the 90hz low pass on my deck instead?