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<blockquote data-quote="RobGMN" data-source="post: 8753041" data-attributes="member: 683408">Have you tried with reference music instead of mp3 files? Process of elimination: eliminate the variables. Replace them with known things.Rip a CD you are intimately familiar with to FLAC or WAV. Use those files as your test music. Set ALL head unit settings to flat or &quot;off&quot; to rule out processing distortions.You could also get your hands on an old-school portable CD player and use that as a source to rule out head unit defects (sorry, &quot;experts&quot; but 99.5% of you couldn&#039;t tell the diff in a blind test between a $200 Rockwood and a $1500 Sony head unit if they are dialed in the same).Cross over your non-sub speakers at 80Hz. Listen to the music and isolate to one speaker at a time. Do they ALL distort, or just one? If just one, swap locations of the speaker. If you still hear the distortion in the same spot, you may be hearing sympathetic buzzing from a car part/panel that presents as distortion from the speaker. You may also be hearing an amp-related distortion. Try a different amp. You may be hearing a head-unit issue. Use a different source.The point of all this is that to properly diagnose, you have to rule out each individual part of the chain to find the problem. It&#039;s the very basis of troubleshooting (versus &quot;shot in the dark&quot; attempts at fixing the problem).Anyone who thinks they can diagnose your issue just by having a parts list and you describing what is going on is someone you probably don&#039;t want to listen to.</blockquote>

[QUOTE="RobGMN, post: 8753041, member: 683408"] Have you tried with reference music instead of mp3 files? Process of elimination: eliminate the variables. Replace them with known things. Rip a CD you are intimately familiar with to FLAC or WAV. Use those files as your test music. Set ALL head unit settings to flat or "off" to rule out processing distortions. You could also get your hands on an old-school portable CD player and use that as a source to rule out head unit defects (sorry, "experts" but 99.5% of you couldn't tell the diff in a blind test between a $200 Rockwood and a $1500 Sony head unit if they are dialed in the same). Cross over your non-sub speakers at 80Hz. Listen to the music and isolate to one speaker at a time. Do they ALL distort, or just one? If just one, swap locations of the speaker. If you still hear the distortion in the same spot, you may be hearing sympathetic buzzing from a car part/panel that presents as distortion from the speaker. You may also be hearing an amp-related distortion. Try a different amp. You may be hearing a head-unit issue. Use a different source. The point of all this is that to properly diagnose, you have to rule out each individual part of the chain to find the problem. It's the very basis of troubleshooting (versus "shot in the dark" attempts at fixing the problem). Anyone who thinks they can diagnose your issue just by having a parts list and you describing what is going on is someone you probably don't want to listen to. [/QUOTE]

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