MikeyD Posted April 25, 2023 Report Share Posted April 25, 2023 Hello all! I have a question about the "max" amp draw for my digital designs m4000 amp. The product spec page says max draw of 400 amps. It has 2 1/0 power inputs. Would this be 200 amp per input? I am trying to figure out how to fuse it properly. Thank you in advance for the knowledge. Quote Link to comment Share on other sites More sharing options...
Joe X Posted April 25, 2023 Report Share Posted April 25, 2023 200 amps per each of the two inputs, Quote Link to comment Share on other sites More sharing options...
MikeyD Posted April 26, 2023 Author Report Share Posted April 26, 2023 5 hours ago, Joe X said: 200 amps per each of the two inputs, SO the proper fusing would be 200 amp on each one correct? Quote Link to comment Share on other sites More sharing options...
Joe X Posted April 26, 2023 Report Share Posted April 26, 2023 The manufacturer should tell you what to use, one can only make assumptions: 4000 / 0.7 = 5714.2 W of input power considering 70% efficiency and nominal rated output power, 5714.2/14.4 = 396.8 A is the current draw at 14.4V (close to what they say should be the maximum current draw). So that means that the fuses will blow on continuous RMS rated power @14.4V. As long as you don't play a continuous sine wave for long and your input voltage stays around 14.4V the 200A fuses will not blow. If you will use the amp for music only likely the two 200A will hold no problem. Quote Link to comment Share on other sites More sharing options...
MikeyD Posted April 27, 2023 Author Report Share Posted April 27, 2023 11 hours ago, Joe X said: The manufacturer should tell you what to use, one can only make assumptions: 4000 / 0.7 = 5714.2 W of input power considering 70% efficiency and nominal rated output power, 5714.2/14.4 = 396.8 A is the current draw at 14.4V (close to what they say should be the maximum current draw). So that means that the fuses will blow on continuous RMS rated power @14.4V. As long as you don't play a continuous sine wave for long and your input voltage stays around 14.4V the 200A fuses will not blow. If you will use the amp for music only likely the two 200A will hold no problem. Thank you so much for the info! Quote Link to comment Share on other sites More sharing options...
Wifebtr Posted April 27, 2023 Report Share Posted April 27, 2023 Just to add a perspective, I have a 3k amplifier that has a 60amp fuse. I'm wired to 1ohm on 2 12s. It's been about 2 years of me jamming to music and the fuse hasn't popped. I think people often overestimate how much current amplifiers draw on music. Quote Link to comment Share on other sites More sharing options...
Kyblack76 Posted April 29, 2023 Report Share Posted April 29, 2023 On 4/27/2023 at 3:55 PM, Wifebtr said: Just to add a perspective, I have a 3k amplifier that has a 60amp fuse. I'm wired to 1ohm on 2 12s. It's been about 2 years of me jamming to music and the fuse hasn't popped. I think people often overestimate how much current amplifiers draw on music. Yep.... you can usually HALF the max draw, and still be under, on music. Quote SMD SUPER SELLER The Burban Build Blazer Build sold Acura trunk build sold Link to comment Share on other sites More sharing options...
audiofanaticz Posted May 2, 2023 Report Share Posted May 2, 2023 On 4/27/2023 at 4:55 PM, Wifebtr said: Just to add a perspective, I have a 3k amplifier that has a 60amp fuse. I'm wired to 1ohm on 2 12s. It's been about 2 years of me jamming to music and the fuse hasn't popped. I think people often overestimate how much current amplifiers draw on music. Chances are high that you 3k amplifier is only a 600 watt amplifier too! Quote Link to comment Share on other sites More sharing options...
MikeyD Posted May 11, 2023 Author Report Share Posted May 11, 2023 I will have 1 run of 2/0 OFC running back to the fuse distro. Will 1 run be enough for the m4000 and a audiocontrol lc 4.800? I would like more runs but DAMN that OFC 2/0 wire is expensive What size fuse should i put to protect the wire from front to back? Quote Link to comment Share on other sites More sharing options...
Joe X Posted May 12, 2023 Report Share Posted May 12, 2023 (edited) 2/0 is good up to about 280 ampere according to most tables, if you think you will push the amp to the limits use what the manufacturer has planned which is two runs of 1/0 gauge each having a 200A fuse in it. Only if you intend to use this amp with music exclusively then you could use a single run of 2/0, since you want to protect the cable as well a single 300A fuse should work. Edited May 12, 2023 by Joe X Quote Link to comment Share on other sites More sharing options...
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