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<blockquote data-quote="jmw703" data-source="post: 7484958" data-attributes="member: 636263">Ok so i just hooked up my subs and amp in my friends car.. everything works..The problem is NOT:The head unitthe substhe amp and all connections to the amp (power wire, ground, rmt,&nbsp; speaker, rca )the rca wire.Meaning the problem lies behind the HU in the wiring which i personally did not do (other than installing the new HU).&nbsp; Im starting to think the local car audio shop which installed my first system did something, because now that i think of it my old system which i bought used had to have the gain cranked in order to be very loud and this was with my old HU with a single 2v pre out.&nbsp; I just didnt know what to expect because the system was used and very old,&nbsp; not very high rms too.I have a ktp 445 alpine mini amp wired to the HU could that in anyway draw signal or power from my HU since it has no dedicated power/ground wire of its own?It is directly between the factory harness of my car and the HU.Or a bad ground connection at the HU? i simply cut the previous connections from the old HU and crimped the new harness to the side of the KTP 445,&nbsp; the ground as well so i did not ground it myself.Other than what i listed above what could cause this weak signal im getting, im really confused right now.Any thoughts or suggestions would be greatly appreciated!</blockquote>

[QUOTE="jmw703, post: 7484958, member: 636263"] Ok so i just hooked up my subs and amp in my friends car.. everything works.. The problem is NOT: The head unit the subs the amp and all connections to the amp (power wire, ground, rmt, speaker, rca ) the rca wire. Meaning the problem lies behind the HU in the wiring which i personally did not do (other than installing the new HU). Im starting to think the local car audio shop which installed my first system did something, because now that i think of it my old system which i bought used had to have the gain cranked in order to be very loud and this was with my old HU with a single 2v pre out. I just didnt know what to expect because the system was used and very old, not very high rms too. I have a ktp 445 alpine mini amp wired to the HU could that in anyway draw signal or power from my HU since it has no dedicated power/ground wire of its own? It is directly between the factory harness of my car and the HU. Or a bad ground connection at the HU? i simply cut the previous connections from the old HU and crimped the new harness to the side of the KTP 445, the ground as well so i did not ground it myself. Other than what i listed above what could cause this weak signal im getting, im really confused right now. Any thoughts or suggestions would be greatly appreciated! [/QUOTE]

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