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<blockquote data-quote="smms25" data-source="post: 6550413" data-attributes="member: 605971">So I installed a Pioneer AVH-P4000DVD, in my 08 mazda&nbsp; and am in the process of installing amp/sub&nbsp;&nbsp; I have Alpine MRD-300 mono and MTX T4512 SVC,&nbsp; I am getting no output whatsoever, but my amp powers up great. No error codes, and getting 14.3-14.4 V... I have already checked my connections, and they seem to be fine.&nbsp; Is there a way I can check the speaker out from the amp (+ and - terminals) to make sure they are sending a signal? Or what other things need I checkUPDATE:&nbsp; Just pulled the headunit out, and the RCA&#039;s are snug, so no problem there - unless I have bad RCA&#039;s but they were brand new -New question:&nbsp; Even though the pioneer avh doesnt have a specified sub pre-amp output,&nbsp; would the amp be able to still send the bass signal to the sub (the reason I ask is maybe the preamp outputs I have the RCA&#039;s in now could be bad)Any other things I could check before I go and get a new amp or sub??</blockquote>

[QUOTE="smms25, post: 6550413, member: 605971"] So I installed a Pioneer AVH-P4000DVD, in my 08 mazda and am in the process of installing amp/sub I have Alpine MRD-300 mono and MTX T4512 SVC, I am getting no output whatsoever, but my amp powers up great. No error codes, and getting 14.3-14.4 V... I have already checked my connections, and they seem to be fine. Is there a way I can check the speaker out from the amp (+ and - terminals) to make sure they are sending a signal? Or what other things need I check UPDATE: Just pulled the headunit out, and the RCA's are snug, so no problem there - unless I have bad RCA's but they were brand new - New question: Even though the pioneer avh doesnt have a specified sub pre-amp output, would the amp be able to still send the bass signal to the sub (the reason I ask is maybe the preamp outputs I have the RCA's in now could be bad) Any other things I could check before I go and get a new amp or sub?? [/QUOTE]

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