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<blockquote data-quote="Eviljacket" data-source="post: 8775860" data-attributes="member: 684057"><p>This may be a newb question, I’m just starting to really dig into proper custom fusing, but why do some amps have built in fuses and some don’t? Say my Alpine MRX-M110 has 100amp fuse built in (4x25amp) but my Orion 2500D does not have any fusing, I think I read somewhere 250amp is what’s best for these at 1ohm, I’m in the process of switching these 2 amps so any insight in fusing the Orion 2500D @ .7ohm&nbsp; would be cool, I keep reading stuff that sounds like fusing is based on what the amp will pull, not what the wire will take. I want to protect the amp as well as my wiring, I’m running single 2awg from battery split to 2x 4awg to amp 4awg inputs. Planned on going with 120 amp fuse on each of the amps 4awg leads and a 250 amp breaker near under hood battery. Was reading 250-300 amp fuse is good for this early Class D mono block for the 1-.5ohm range. I’m just reading from multiple sources that the fusing is to protect the wiring but isn’t also to protect the amp? Or am I just thinking all newbish and wrong? I plan on clamping this amp soon as it’s hooked up to know what I’m pulling at max and general ride listening volumes, gains set with my Oscope to prevent clipping of any sort.</p></blockquote><p></p>

[QUOTE="Eviljacket, post: 8775860, member: 684057"] This may be a newb question, I’m just starting to really dig into proper custom fusing, but why do some amps have built in fuses and some don’t? Say my Alpine MRX-M110 has 100amp fuse built in (4x25amp) but my Orion 2500D does not have any fusing, I think I read somewhere 250amp is what’s best for these at 1ohm, I’m in the process of switching these 2 amps so any insight in fusing the Orion 2500D @ .7ohm would be cool, I keep reading stuff that sounds like fusing is based on what the amp will pull, not what the wire will take. I want to protect the amp as well as my wiring, I’m running single 2awg from battery split to 2x 4awg to amp 4awg inputs. Planned on going with 120 amp fuse on each of the amps 4awg leads and a 250 amp breaker near under hood battery. Was reading 250-300 amp fuse is good for this early Class D mono block for the 1-.5ohm range. I’m just reading from multiple sources that the fusing is to protect the wiring but isn’t also to protect the amp? Or am I just thinking all newbish and wrong? I plan on clamping this amp soon as it’s hooked up to know what I’m pulling at max and general ride listening volumes, gains set with my Oscope to prevent clipping of any sort. [/QUOTE]

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