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<blockquote data-quote="keep_hope_alive" data-source="post: 7423137" data-attributes="member: 576029">i need the actual model number to verify a few things, but given it&#039;s an Xplod amp and from the use of the term &quot;boot&quot; you&#039;re in Europe, i can reference a newer model manual sold in the UK.&nbsp; Maybe the XM ZR604R?<a href="http://pdf.crse.com/manuals/3214760111.pdf" target="_blank">http://pdf.crse.com/manuals/3214760111.pdf</a>verify the rear LPF and front HPF were off during your tests.&nbsp; having those on would make it difficult to hear when the signals were reversed.&nbsp; that amp is made to run a sub on ch 3/4 only.your test requires that the wiring is perfect.&nbsp; you can only bridge on two specific terminals.that amp (like most xplod amps) needs to have 4 RCA inputs in order to output on front and rear channels.&nbsp; I assume you have 4 channels of RCA since you mention you labeled one &quot;rca pair&quot; with tape.&nbsp; what is telling is that you get no output when &quot;rca with tape&quot; is on the right (rear).&nbsp; you only get output when the non-taped RCA is on the front (left) input, and only then do you get output on channels 1/2.based on your tests above (and assuming all crossovers were off), i suspect a bad RCA cable (the one with tape) and bad 3/4 channels.&nbsp; since you tested a second amp, then i still suspect the bad RCA cable but also a wiring mix-up.some head units have built-in crossovers.&nbsp; if so, then you&#039;d need to defeat them as well to do the tests you described.&nbsp; having an HPF on the HU output would cancel with the LPF on the amp.How to Test further:you need a Digital Multi-Meter (DMM) that allows you to measure Volts DC and Resistance (ohms).you should start by testing the wiring.&nbsp; use the DMM to measure resistance on the speaker wires (speaker wiring should be disconnected from the amp before testing.)&nbsp; simply measure between (+) and (-) and see if the readings make sense (all three pairs should measure between 3.4-3.6 ohms.next test the RCA cables by measuring resistance between each end of each cable.&nbsp; measure between center pins on each end and then measure shield on each end (should have less than 0.6 ohms for both tests).next measure between center pin and shield on one end (should have an open circuit).after you&#039;ve tested the wiring, report the results.to verify power - use the DMM to measure DC voltage at the amp. measure both the amp battery connection and the remote turn on (when HU is on).&nbsp; both should read between 12-14VDC.&nbsp; do this test with speaker wiring disconnected. RCA&#039;s can be connected.&nbsp; a test light is not sufficient, you need to measure the actual voltage.&nbsp; use the amp ground terminal as the reference.</blockquote>

[QUOTE="keep_hope_alive, post: 7423137, member: 576029"] i need the actual model number to verify a few things, but given it's an Xplod amp and from the use of the term "boot" you're in Europe, i can reference a newer model manual sold in the UK. Maybe the XM ZR604R? [URL="http://pdf.crse.com/manuals/3214760111.pdf"]http://pdf.crse.com/manuals/3214760111.pdf[/URL] verify the rear LPF and front HPF were off during your tests. having those on would make it difficult to hear when the signals were reversed. that amp is made to run a sub on ch 3/4 only. your test requires that the wiring is perfect. you can only bridge on two specific terminals. that amp (like most xplod amps) needs to have 4 RCA inputs in order to output on front and rear channels. I assume you have 4 channels of RCA since you mention you labeled one "rca pair" with tape. what is telling is that you get no output when "rca with tape" is on the right (rear). you only get output when the non-taped RCA is on the front (left) input, and only then do you get output on channels 1/2. based on your tests above (and assuming all crossovers were off), i suspect a bad RCA cable (the one with tape) and bad 3/4 channels. since you tested a second amp, then i still suspect the bad RCA cable but also a wiring mix-up. some head units have built-in crossovers. if so, then you'd need to defeat them as well to do the tests you described. having an HPF on the HU output would cancel with the LPF on the amp. How to Test further: you need a Digital Multi-Meter (DMM) that allows you to measure Volts DC and Resistance (ohms). you should start by testing the wiring. use the DMM to measure resistance on the speaker wires (speaker wiring should be disconnected from the amp before testing.) simply measure between (+) and (-) and see if the readings make sense (all three pairs should measure between 3.4-3.6 ohms. next test the RCA cables by measuring resistance between each end of each cable. measure between center pins on each end and then measure shield on each end (should have less than 0.6 ohms for both tests). next measure between center pin and shield on one end (should have an open circuit). after you've tested the wiring, report the results. to verify power - use the DMM to measure DC voltage at the amp. measure both the amp battery connection and the remote turn on (when HU is on). both should read between 12-14VDC. do this test with speaker wiring disconnected. RCA's can be connected. a test light is not sufficient, you need to measure the actual voltage. use the amp ground terminal as the reference. [/QUOTE]

Verification