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hello I recently purchased a distortion detector and the problem is I have a BMW 3 series and it does not show the volume level, How would I use this properly without knowing the acutally volume level that its at?, it's the navigation headunit type, Plus if I remove the subwoofer speaker wire from the amp, the door speakers still play loud from the Cd tracks is that normal ? becuase in YouTube videos i see online i dont hear any sound while they set their gains. 2 Amps: Mrv500, do I set the LP filter back to 80hrz after its tuned? 2 subwoofers: Pioneer TS-W309D4 12" Champion Series Subwoofer with Dual 4 Voice Coil

Ok probably a dumb question but ima ask neway i set my gains on the hu, fr amp, and sub amp with the disc as im supposed to and all is good. and for shits and giggles i played music and tested my amps with the dd1 and get a solid distort light light on my full range amp and a flashing on the subwoofer amp. Is this normal??? everything sounds fine just dont want too damage my equipment... Question 2, I have a Kenwood kdc-hd548u and it has a sub level -15-+15 adj as of now I have it set at 0 but after researching some say crank it up then set gains and some say keep it flat then set gains. so idk wich is better level high gain low or level flat and gain high????THANKZ

Hello everyone. What test tone should I use for my HU until I get distortion? I've set the HU with 0db test tones until i got distortion on rca , then I moved to amp speaker output and switched to -7.5 db test tone until I've got distortion. Is this correct or I should also look for distortion on the HU with -7.5db tt (I want to use -7.5 on my system )

As the title says , where should my LPF be when setting the gain? At the desired position or at max ?

So I saw the manual that said use -10 for loud setting. So what is the -15 used for? Wouldn't that be used for louder sound? I did some research and found music these days whether it be pop or hip hop use a range between -12 to -14 on their recordings.