Do the same procedure for the tweeters.Ħ. Then unhook the midbasses and play the mids only and follow the same polarity and listening tests as before. If the centered sounds are more diffuse and un-locatable, then flip the polarity back to where it was originally.Ĥ. If the sounds are more centered then keep it as is. I usually flip the driver’s side speaker.) and re-listen to the test CD. Then reverse the polarity of one midbass (Reverse the speaker wires coming from the passive crossover and going to the speaker, just flip the positive and negative wires. Listen to where the centered sounds are coming from. Test CDs such as the IASCA test CD or Autosound 2000 Test CD 102 or 103 will work great. Listen to mono pink noise or a well-recorded song with a centered vocalist. Unhook the mids and tweeters, allowing only the midbasses to play. Using music with a good bass line, run the highpass crossover up and down until the midbasses can play as low as possible without any distortion or excessive door panel vibrations.ģ. Set all bands flat, as well as the head unit bass and treble.Ģ. If the sound gets worse, then you can go back to the previous step’s settings and start over.ġ. Remember after each step to write down your settings. I think the eq should be last in line when tuning. This method uses crossovers and gain settings as the most important factor in tuning. An RTA is not needed if the steps are done correctly. There are several different methods used to tune eqs. This guide was originally posted on DIYMA, but I'm reposting it here for reference.
You don't need anything except what you've already got (or can get for free):
Seriously, this is one of the best guides I've read on tuning.