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<blockquote data-quote="Buck" data-source="post: 8861805" data-attributes="member: 591582">Check your RCA’s going into the amp, make sure they work.&nbsp; You can switch the RCA’s around to ever see if a problem is related to a damaged RCA or some other signal-line problem, or if some of the amp’s channels are broken internally.&nbsp; You can also play some test tones only on the rear speakers, by either fading to rear or unplugging the front channel RCA’s at the amp.Playing test tones at different frequencies can indicate if a speaker is blown, and with coaxials, it can tell you which exact speaker is blown.&nbsp; So, if your mid woofer is blown, it’ll sound like doo with upper bass frequencies (let’s say 50-150 hz), and if your tweeter(s) are blown, it’ll sound like doo from somewhere like 3,000-20,000 hz.&nbsp; That’s an easy way to usually tell which exact speaker the distortion is coming from.If you have a digital multimeter, I would encourage you to read the coils’ ohms on the rear speakers, even if you only want to or can read them at the amp.&nbsp; If some part of the speaker coil is falling apart, you can usually see it in the ohms that the coils read, but sometimes not.There’s free test tone or tone generator apps you can download onto a smartphone, if your radio works like that.&nbsp; You can also get a headphone jack to RCA connector and just run the amp signal completely off the phone, bypassing the radio and RCA’s, which is useful to see if there’s HU or RCA problems, as well.&nbsp; Test tones are stupid fun to play around with, sometimes, haha.&nbsp; Just don’t turn it up too loud, because the signal strength of a tone generator is usually more than just a musical song.</blockquote>

[QUOTE="Buck, post: 8861805, member: 591582"] Check your RCA’s going into the amp, make sure they work. You can switch the RCA’s around to ever see if a problem is related to a damaged RCA or some other signal-line problem, or if some of the amp’s channels are broken internally. You can also play some test tones only on the rear speakers, by either fading to rear or unplugging the front channel RCA’s at the amp. Playing test tones at different frequencies can indicate if a speaker is blown, and with coaxials, it can tell you which exact speaker is blown. So, if your mid woofer is blown, it’ll sound like doo with upper bass frequencies (let’s say 50-150 hz), and if your tweeter(s) are blown, it’ll sound like doo from somewhere like 3,000-20,000 hz. That’s an easy way to usually tell which exact speaker the distortion is coming from. If you have a digital multimeter, I would encourage you to read the coils’ ohms on the rear speakers, even if you only want to or can read them at the amp. If some part of the speaker coil is falling apart, you can usually see it in the ohms that the coils read, but sometimes not. There’s free test tone or tone generator apps you can download onto a smartphone, if your radio works like that. You can also get a headphone jack to RCA connector and just run the amp signal completely off the phone, bypassing the radio and RCA’s, which is useful to see if there’s HU or RCA problems, as well. Test tones are stupid fun to play around with, sometimes, haha. Just don’t turn it up too loud, because the signal strength of a tone generator is usually more than just a musical song. [/QUOTE]

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