Is it true that if a amp has two 30 amp fuses it can only put out 600 watts rms?
2x40 amp fuses = 800 wrms max ect ect...
Is it true that if a amp has two 30 amp fuses it can only put out 600 watts rms?
2x40 amp fuses = 800 wrms max ect ect...
roughly. its about 10a per 100w
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that is just in general, for every 100 clean rms you need 10a of current.
some amps,as an example, are 80%efficent and some are 60%. so it will vary from amp to amp.
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so 2x40 amp fuses can do 800wrms at 100% efficiency but it cant possibly do more right?
the amps ive seen. my aq 2200d was 200a my 3250 is 300a. someone posted a jl 1000/1 and said the manual said 100a. so yeh its seems that its about 10a per 100w.
'08 Ford Escape XLT
2 12" DC XL's + 2 RD D9s
Selenium and Crescendo on AQ4X90
if you think so..
at 12v, you can calculate the approximate max (clean) rms by multiplying 12*fuse rating. So an amp with a 10a fuse would give you 120 watts @ 12v. Now consider that it is likely 80% efficient or so depending on what kind of amp/quality/etc...and you end up with a little under 100 watts.
Yes, guessing that an amp will do 10 times it's fuse rating in power is generally a good estimate. You will not find an amp that needs a 50 amp fuse making 1000 watts at 12-14v without serious distortion and blowing that fuse if not damaging the amp
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totally wrong there is plenty of amps out there that have 2 40 amp fuses and are rated @1200rms and do 1400ish clamped. reason it takes 200% of fuse rating to blow over a 3sec period.
Thats my general rule of thumb. It's not accurate, but it's good enough for a guesstimate. There's usually a pretty good correlation.
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Fuse rating also depends on if your amp is High Voltage/High Impedance versus High Current/Low Impedance. I have an amp that does 400 watts RMS @ 8 ohms with a tiny *** 25 amp fuse! Of course the rail voltages inside of that amplifier are high enough to pack a serious wallop to them!
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