what do i need to do to find out the actual rms my amp is putting out? do i need a voltmeter or what do i do?
you need a multimeter with a amp clamp the cheap and not most accurate way is to put a test one on the frequency your low pass is set at use the multimeter ac clamp the power wire it will tell you the the amperage. Next take your meter put it on voltage ac go to the positive and negative of the speaker terminals of the amp record this number then times the two together this would be the watts the amp is putting out. Take a third measurement with the meter in dc voltage at the positive and ground wire and see how low it dips record that number. formula is amperage x voltage = wattage So if your seeing 13.5 volts dc at pos and neg 35 amps 30 volts ac you have 1050 watts at 13.5 volts
I have to completely disagree...not being rude the efficiency of the power supply and outputs has a great impact upon the true rms output. the math may be right, but it is NOT an indicator of what the amp is putting out.
I'm not right on everything I thought thats how you did it roughly how would you do it with a multimeter so I understand I know ohms law just I figured that if I had all the variables amps voltage thats how then what would I do percentage of my findings.Or would that be a rough figure at the dc voltage produced let me know also I come on this site to learn myself. You have more experience just thought that was how it was done in the field I would appreciate the imput this is not sarcasm.:huh:
well my amp has 3 25 amp fuses, and i was just guessing on my electrical on the low notes wo uld be 12 volts and 12x25 is 900 is that 900 rms because i have my subs wired to 1ohm and at 14.4 volts my amp will do 1000rms
your amp is probably rated 750rms PLus or minus 10 percent thats what I heard by sizing by fuse was rule of thumb but I still want to know myself how to check the wattage my theory would have been outout voltage time imput amperage at imput voltage it seems the way you calculated is by fuse size and imput voltage which is not right I'm pretty sure. I still want to know the exact way to calculate what your amp is producing.
all i know is i had 2 powerbass 12''s in a ported box rated at 300rms a piece had em wired to 1ohm and i blew them
the rough way to figure the power is you have 3 25 amp fuse times the rated fuse by ten to get a real rough estimate but what I was saying is a amp clamp method.Actually clamping the power wire to determine the amperage then measuring the voltage of the speaker jacks to get what the amp was pushing to those subs.But if you blew your subs chances are your amp was clipping or the subs were overheating and you didn't notice till to late.
lol i dont think they were clipping, i think they just blew, it smelt like a blown speaker. they aint the best subs in the world, and why do you times it your fuse by 10? i thought you took it times the volts you were getting?
the two Statements I made were different ways to check One was called a clamped method which is the first statement the second was rule of thumb way without benching or even hearing the amp like if I went to a store and seen a lanzar vibe saying it was 4000 watts and it had two 40 amp fuses I would figure its roughly putting out 800 watts this would not a accurate way to test but close enough to tell me that this amp was junk and way overated.since I seen your amp had 3 25 amp fuses this would tell me its some where around 750 watts at a glance.Blowing the subs theres a article in caraudiomag that I was trying to find that explained If your not clipping you could put up to 5 X the rated power to a sub and not blow it. Two subs blowing from a amp that had 3 25 amp fuses tells me they were probably getting clipped.Thats the same thing I did to my first subs when I was 16 and then after I messed with audio more and more I can now tell the difference A sub overheating and blowing was not being paid attention to And this could have been prevented.
