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<blockquote data-quote="Chrisw21" data-source="post: 7557312" data-attributes="member: 636612"><p>Ya know thumper.... normally I would agree with this comment, but I just bought 2 ARC amps and now I&#039;m interested to hear the response from Brad in Tech Support!! I got a FD4150 (same manual as OP has) and a FD600.1. The manual for the 600.1 matches what I would expect on the amp. The 4150 has the same issue as posted above. The strange part (to me) is that both amps use the same connector for power, but the grounds and +12 are reversed on the amps. I find this strange because, coming from a manufacturing background, I know that the cheapest and easiest way to build product is to change as little as possible. So why have the connecter go GND-TURN ON-12V on one amp and then 12V-TURN ON-GND on another??? I&#039;m thinking someone got lazy and did a &quot;copy/paste&quot; somewhere here, but the question is, did they &quot;copy/paste&quot; wrong in the instruction manual, or the screen printing on the amp???? I&#039;ll either wait to see the response from Brad or pull off the bottom cover on the 4150 (PITA Arc!!!! Put the fuse external!!!!) and check with a DMM.......</p></blockquote><p></p>

[QUOTE="Chrisw21, post: 7557312, member: 636612"] Ya know thumper.... normally I would agree with this comment, but I just bought 2 ARC amps and now I'm interested to hear the response from Brad in Tech Support!! I got a FD4150 (same manual as OP has) and a FD600.1. The manual for the 600.1 matches what I would expect on the amp. The 4150 has the same issue as posted above. The strange part (to me) is that both amps use the same connector for power, but the grounds and +12 are reversed on the amps. I find this strange because, coming from a manufacturing background, I know that the cheapest and easiest way to build product is to change as little as possible. So why have the connecter go GND-TURN ON-12V on one amp and then 12V-TURN ON-GND on another??? I'm thinking someone got lazy and did a "copy/paste" somewhere here, but the question is, did they "copy/paste" wrong in the instruction manual, or the screen printing on the amp???? I'll either wait to see the response from Brad or pull off the bottom cover on the 4150 (PITA Arc!!!! Put the fuse external!!!!) and check with a DMM....... [/QUOTE]

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