Amp Spec Questions...??????????
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Senior Member
Joined: Apr 2001
Posts: 175
ok i know that an amp rated at a lower voltage is more powerful then an amp rated at a higher voltage(same rms wattage), so how come some amps that supposedly put out more rms watts have a lower fuse rating.
for example in the crutchfield catalog:
RF punch 600.4 | (rms) 75w x 4 @13.8V | 50 amp fuse
US acoustics USX4085 | (rms) 85w x 4 @ 12.9V | 35 amp fuse
so why does the rockford, which has lower rated output use a higher amp fuse?
for example in the crutchfield catalog:
RF punch 600.4 | (rms) 75w x 4 @13.8V | 50 amp fuse
US acoustics USX4085 | (rms) 85w x 4 @ 12.9V | 35 amp fuse
so why does the rockford, which has lower rated output use a higher amp fuse?
Maybe..
Originally posted by Gunner
ok i know that an amp rated at a lower voltage is more powerful then an amp rated at a higher voltage(same rms wattage), so how come some amps that supposedly put out more rms watts have a lower fuse rating.
for example in the crutchfield catalog:
RF punch 600.4 | (rms) 75w x 4 @13.8V | 50 amp fuse
US acoustics USX4085 | (rms) 85w x 4 @ 12.9V | 35 amp fuse
so why does the rockford, which has lower rated output use a higher amp fuse?
ok i know that an amp rated at a lower voltage is more powerful then an amp rated at a higher voltage(same rms wattage), so how come some amps that supposedly put out more rms watts have a lower fuse rating.
for example in the crutchfield catalog:
RF punch 600.4 | (rms) 75w x 4 @13.8V | 50 amp fuse
US acoustics USX4085 | (rms) 85w x 4 @ 12.9V | 35 amp fuse
so why does the rockford, which has lower rated output use a higher amp fuse?
Just my $0.02
Rockford underates the power output of their amplifiers.
Thats why they have a higher fuse rating
What kind of system are you trying to hook up?
MaximaDave
Car Audio Mgr
San Diego, CA
Thats why they have a higher fuse rating
What kind of system are you trying to hook up?
MaximaDave
Car Audio Mgr
San Diego, CA
Donating Maxima.org Member
Joined: Aug 2000
Posts: 2,931
Originally posted by Gunner
ok i know that an amp rated at a lower voltage is more powerful then an amp rated at a higher voltage(same rms wattage), so how come some amps that supposedly put out more rms watts have a lower fuse rating.
ok i know that an amp rated at a lower voltage is more powerful then an amp rated at a higher voltage(same rms wattage), so how come some amps that supposedly put out more rms watts have a lower fuse rating.
Thread Starter
Senior Member
Joined: Apr 2001
Posts: 175
Originally posted by maximadave
Rockford underates the power output of their amplifiers.
Thats why they have a higher fuse rating
What kind of system are you trying to hook up?
MaximaDave
Car Audio Mgr
San Diego, CA
Rockford underates the power output of their amplifiers.
Thats why they have a higher fuse rating
What kind of system are you trying to hook up?
MaximaDave
Car Audio Mgr
San Diego, CA
The main reasons for fuse rating differences are the power supply requirements due to differences in amplifier efficiency..
In English: just like a honda can make 120hp and get 40miles/gallon compared to a chevy celibrity making 120hp and getting 25mpg.. the efficiency of the equipment is different, due to differences in design.
Of course, this doesn't mean an amp with a smaller fuse is always more efficient or better. some amps have HUGE power supplies for their rated power output.. this can produce a cleaner sound at high power, because the power supply isn't straining to give the amp the power it needs. But then again, the huge power supply could be due to poor overall design and poor efficiency.. so it'll sound okay but draw TONS of power.
blah blah blah.. I think I made my point.
In English: just like a honda can make 120hp and get 40miles/gallon compared to a chevy celibrity making 120hp and getting 25mpg.. the efficiency of the equipment is different, due to differences in design.
Of course, this doesn't mean an amp with a smaller fuse is always more efficient or better. some amps have HUGE power supplies for their rated power output.. this can produce a cleaner sound at high power, because the power supply isn't straining to give the amp the power it needs. But then again, the huge power supply could be due to poor overall design and poor efficiency.. so it'll sound okay but draw TONS of power.
blah blah blah.. I think I made my point.
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Posts: 2,931
Originally posted by edadams
The amperage ratings vary due in part to the different types of amplification. IE: Class A,AB,C,D. With D being the most efficient. The D amplifiers are digital and require less power than conventional amplifiers.
The amperage ratings vary due in part to the different types of amplification. IE: Class A,AB,C,D. With D being the most efficient. The D amplifiers are digital and require less power than conventional amplifiers.
Class C is not used in car audio, and Class D is not "digital".
Thread Starter
Senior Member
Joined: Apr 2001
Posts: 175
Originally posted by maximadave
Rockford underates the power output of their amplifiers.
Thats why they have a higher fuse rating
What kind of system are you trying to hook up?
MaximaDave
Car Audio Mgr
San Diego, CA
Rockford underates the power output of their amplifiers.
Thats why they have a higher fuse rating
What kind of system are you trying to hook up?
MaximaDave
Car Audio Mgr
San Diego, CA
i know that rockford underrates their amps, so what do you think i should get?
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Joined: Aug 2000
Posts: 2,931
Originally posted by Gunner
i have four infinity kappas...components fronts (90w rms) and coax in the rear (70w rms). should i get a 600.4(75wx4rms) which i know will be more than enough or would a 400.4(50wx4rms) serve just as well?
i know that rockford underrates their amps, so what do you think i should get?
i have four infinity kappas...components fronts (90w rms) and coax in the rear (70w rms). should i get a 600.4(75wx4rms) which i know will be more than enough or would a 400.4(50wx4rms) serve just as well?
i know that rockford underrates their amps, so what do you think i should get?
The 400.4 will be plenty.
Senior Member
Joined: Oct 2000
Posts: 1,249
Originally posted by Gunner
ok i know that an amp rated at a lower voltage is more powerful then an amp rated at a higher voltage(same rms wattage), so how come some amps that supposedly put out more rms watts have a lower fuse rating.
for example in the crutchfield catalog:
RF punch 600.4 | (rms) 75w x 4 @13.8V | 50 amp fuse
US acoustics USX4085 | (rms) 85w x 4 @ 12.9V | 35 amp fuse
so why does the rockford, which has lower rated output use a higher amp fuse?
ok i know that an amp rated at a lower voltage is more powerful then an amp rated at a higher voltage(same rms wattage), so how come some amps that supposedly put out more rms watts have a lower fuse rating.
for example in the crutchfield catalog:
RF punch 600.4 | (rms) 75w x 4 @13.8V | 50 amp fuse
US acoustics USX4085 | (rms) 85w x 4 @ 12.9V | 35 amp fuse
so why does the rockford, which has lower rated output use a higher amp fuse?
it's all gotta deal with ohm's law my little grasshoppa....
Thread Starter
Senior Member
Joined: Apr 2001
Posts: 175
Originally posted by Micah95GLE
The 400.4 will be plenty.
The 400.4 will be plenty.
because its underpowered im afraid to turn up the volume too high cause it could damage the speakers, right? thanks again.
Senior Member
Joined: Jan 2001
Posts: 216
Originally posted by Gunner
ok i know that an amp rated at a lower voltage is more powerful then an amp rated at a higher voltage(same rms wattage), so how come some amps that supposedly put out more rms watts have a lower fuse rating.
for example in the crutchfield catalog:
RF punch 600.4 | (rms) 75w x 4 @13.8V | 50 amp fuse
US acoustics USX4085 | (rms) 85w x 4 @ 12.9V | 35 amp fuse
so why does the rockford, which has lower rated output use a higher amp fuse?
ok i know that an amp rated at a lower voltage is more powerful then an amp rated at a higher voltage(same rms wattage), so how come some amps that supposedly put out more rms watts have a lower fuse rating.
for example in the crutchfield catalog:
RF punch 600.4 | (rms) 75w x 4 @13.8V | 50 amp fuse
US acoustics USX4085 | (rms) 85w x 4 @ 12.9V | 35 amp fuse
so why does the rockford, which has lower rated output use a higher amp fuse?
Also, depends on the max amount of current draw
during peak operation... specific for each amp.
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