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<blockquote data-quote="BreakingBad" data-source="post: 3242456" data-attributes="member: 569807">Ok, i would&#039;ve posted this in amp&#039;s but it&#039;s a question about a sub and an amp.My original system: 2 RE SX 12s, AX-1500DE (us amps, 1500+watts)that bumped.upgraded to an 18&quot; XXX..startd getting problems with the amp, specifically a &#039;fapping&#039; noise and distortion going through the sub when a low note came in. these also occured on my 12&#039;s.had the amp sent back for repair, a capacitor was replaced. the &#039;fapping&#039; stopped, but the distortion continued. talked to US amps multiple times, and there response was this..1.) the &#039;kick-back&#039; from the XXX 18 is &quot;collapsing the power supply&quot; on the amp essentially sending the sub nothing but distortion. was told that the 1500 is not sufficient to run the XXX 18, and that 200 amp alt wasn&#039;t enough essentially.i told the guy that i ran the same amp on my 12&#039;s, on a stock alt, and it worked flawlessly. i also told him i put a small alpine and JL amp on my XXX 18, and it bumped.. how come the AX1500 isn&#039;t?he then saw a picture of my ground (installed by a joke of a shop in pittsburgh) and said that it could actually be the transistors in the amp.i know yall dont have all the details.. but...when a low note would come in, the sub would make an &#039;errrrrrrr&#039; sound with intermittent bass. the bass was never consistent and the distortion would continue. if i turned the volume up, nothing but distortion came out.grounds were checked, alt was checked, battery was checked. does this sound like bad transistors/something wrong on the amp? US said that their &#039;testing&#039; doesn&#039;t test the transistors, and that could be the problem... or the PS is collapsing.any insights?</blockquote>

[QUOTE="BreakingBad, post: 3242456, member: 569807"] Ok, i would've posted this in amp's but it's a question about a sub and an amp. My original system: 2 RE SX 12s, AX-1500DE (us amps, 1500+watts) that bumped. upgraded to an 18" XXX.. startd getting problems with the amp, specifically a 'fapping' noise and distortion going through the sub when a low note came in. these also occured on my 12's. had the amp sent back for repair, a capacitor was replaced. the 'fapping' stopped, but the distortion continued. talked to US amps multiple times, and there response was this.. 1.) the 'kick-back' from the XXX 18 is "collapsing the power supply" on the amp essentially sending the sub nothing but distortion. was told that the 1500 is not sufficient to run the XXX 18, and that 200 amp alt wasn't enough essentially. i told the guy that i ran the same amp on my 12's, on a stock alt, and it worked flawlessly. i also told him i put a small alpine and JL amp on my XXX 18, and it bumped.. how come the AX1500 isn't? he then saw a picture of my ground (installed by a joke of a shop in pittsburgh) and said that it could actually be the transistors in the amp. i know yall dont have all the details.. but... when a low note would come in, the sub would make an 'errrrrrrr' sound with intermittent bass. the bass was never consistent and the distortion would continue. if i turned the volume up, nothing but distortion came out. grounds were checked, alt was checked, battery was checked. does this sound like bad transistors/something wrong on the amp? US said that their 'testing' doesn't test the transistors, and that could be the problem... or the PS is collapsing. any insights? [/QUOTE]

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