on my amp power wire i have a 100 amp fuse that came with my wiring kit.

im just wandering, my amp itself has something like a 30 amp fuse or mabey lower, lets say a surge went through my power wire to the amp that was enough to blow the fuse on the amp but not the one on my main power wire, could this potentially damage the amp?

i guess the main question is, should i put something along the lines of a 30 amp fuse on the power cable?

 

Once the amp fuse is blown nothing more can happen to the amp. 94

 

how long of length is your power wire and what size gauge is it?

if you want to be safe, just buy another fuse. teir usually 5-15 bucks depending if its agu/anl/etc.

but keep in mind, fuse amperes also goes by what size wire. ive ran 4ga from my battery to my trunk with 60A with no problems. generally, 4ga should be using 100A-150A

 

^^^^^ sorry but I cant agree with you on this one. The fuse under the hood is to protect the battery from a short going thru the fire wall. It should have the same rating as the amp's that you are using. Or it there if more then one, sum them up and put sum there.

 

my amp has a 25 and my power wire has a 100a 4ga wire

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote"> The fuse under the hood is to protect the battery from a short going thru the fire wall. </TD></TR></TABLE>

Technically, the fuse is there to protect the wire itself.

 

so a 100amp fuse should be fine? or should i lower it?

the amp is only pushing like 400 rms or lower, its not a big system at all

 

If your amp only has a 25A fuse you don't need anything bigger then a 25A on the power wire, but it will not hurt anything to leave the 100A in place, 4 ga wire is good to about 150A.

BTW if the amp has a 25A fuse, I bet the RMS power is less then 200 watts. 94

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18C_EJ8 &raquo;</TD></TR><TR><TD CLASS="quote">

Technically, the fuse is there to protect the wire itself. </TD></TR></TABLE>

yea that too, Didn't list that as a factor. Thanks for the corection or update.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fcm &raquo;</TD></TR><TR><TD CLASS="quote">If your amp only has a 25A fuse you don't need anything bigger then a 25A on the power wire, but it will not hurt anything to leave the 100A in place, 4 ga wire is good to about 150A.

BTW if the amp has a 25A fuse, I bet the RMS power is less then 200 watts. 94</TD></TR></TABLE>

yeah its an 800 watt max boss c550 i have it bridged at 4 ohms, at 4 ohms 1 channel is 125 watt rms according to BOSS.

so its somewhere around 250 id say, but with my sealed box and that 300 watt rms infinity it is very loud and sounds really clear. better than having 4 standalone 6.5

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fcm &raquo;</TD></TR><TR><TD CLASS="quote">BTW if the amp has a 25A fuse, I bet the RMS power is less then 200 watts. 94</TD></TR></TABLE>

If an amp has a 25A fuse, then chances are it is not going to draw any more than 20 amps. After all, 25A will blow the fuse. And since the fuse is a fast-blow, some margin for error is necessary for power peaks. So if it is drawing 20 amps at 13.8 volts, then it is drawing 276 watts from the battery/alternator. Now a typical amplifier is only about 50-60 percent efficient. So this means that an amp can only produce about 138-166 watts RMS with a 20A draw. And that's a best-case scenario for an amp with a 25A fuse, as your amp could be drawing considerably less than 20A at full power.

 

thanks guys.


i actually first thought that the fuse on the power cable was to help protect the amp itself, now i know differently and will just leave the fuse that i have.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18C_EJ8 &raquo;</TD></TR><TR><TD CLASS="quote">Technically, the fuse is there to protect the wire itself. </TD></TR></TABLE>

Actually, the real purpose of this fuse is to keep your car from catching on fire. It is no big deal if a wire goes bad. But if the battery shorts, that wire is going to get REALLY hot. Ideally, the fuse should be kept as small as possible for the best protection possible. So it should be equal to the sum of all fuses on all connected amps.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by StorminMatt &raquo;</TD></TR><TR><TD CLASS="quote">

Actually, the real purpose of this fuse is to keep your car from catching on fire. It is no big deal if a wire goes bad. But if the battery shorts, that wire is going to get REALLY hot. Ideally, the fuse should be kept as small as possible for the best protection possible. So it should be equal to the sum of all fuses on all connected amps.</TD></TR></TABLE>Although I agree in the end the fuse is there to protect the car, but if the batt. shorts out it will have no effect on the wire, the wire can only get "real hot" if it shorts out or the load is too high and the fuse is a higher rating then the wire is capable of handling, once current draw exceeds power wire rating wire will get hot, and it makes no diff. if thats from a short to ground or if the load on the power wire is more then it's rated for.
I also agree that the size of the fuse does not need to be bigger then the total sum of the loads connected to them, but it can't hurt anything to use a bigger fuse as long as it's no bigger then the rated current handling of the wire. 94