making a pretty good guess what an ap is putting out

[adio 5,000+ posts]

if this needs to be moved to the 'amplifiers' section, please do it.

ok, since you slimy ass hookers didn't wanna answer my other threa here's a new one. how can u use a formula to guess how much an amplifier is putting out? right now, i'm looking for an amp that will eventually power some crystal components and i'm not looking fr any less that 175 watts for each side. i'm kinda narrowed down to

1.) a PG xenon 100.4

2.) profile ap1000

3.) precision power A1000/2

4.) one the older mtx thunder amps ( with the shiny surface)

money is a factor. in another thread, i asked if anybody has bench a profile amp or seen a thread where one was bench, but i got no responses. here's the specs for the profile

2-channel car amplifier

» 240 watts RMS x 2 at 2 ohms

» 480 watts RMS x 1 bridged output at 4 ohms (4-ohm stable in bridged mode)

» variable filters (low-pass from 50-250 Hz, high-pass from 80-1200 Hz, at 12 dB per octave)

» variable bass boost (0-12 dB at 45 Hz)

» stereo or bridged mono output

» Tri-way capable (Tri-Way Crossover required)

» preamp- and speaker-level inputs

» preamp outputs

» fuse rating: 30A x 2

i'm only asking about the profile cause i know its overrated. please help.

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[theCybe 5,000+ posts]

The xenon amps are magnificent.

 

[Beat_Dominator 5,000+ posts]

PG ftw. Profile is not worthy.

 

[adio 5,000+ posts]

i know, but bidding on 1(a PG) on ebay, so i don't know yet

 

[adio 5,000+ posts]

bump for help

 

[GemaRastem 10+ year member]

alright the profile has 2 30 amp fuses=60 amps max current. It can't bring anymore current then that in or else it blows a fuse. P=VI

V=14.4ish volts

I=60 amps

P=864 watts

assuming no more than 65% efficiency for a class AB

.65*864=561.6

at perfect class AB efficiency, and max current pull without blowing the internal fuses, you can get 280 watts per channel

 

[adio 5,000+ posts]

alright the profile has 2 30 amp fuses=60 amps max current. It can't bring anymore current then that in or else it blows a fuse. P=VI
V=14.4ish volts

I=60 amps

P=864 watts

assuming no more than 65% efficiency for a class AB

.65*864=561.6

at perfect class AB efficiency, and max current pull without blowing the internal fuses, you can get 280 watts per channel

are u super duper sure?? the profile is rated at 255 watts per channel, and most profile amps are overrated. thanks for the help though, this is exactly what i was looking for. anybody else, please chime in.

 

[msimon 10+ year member]

There is no way that you can look at amplifier specs listed on the internet and plug them into a formula and expect to find out what the amplifier will reproduce.

 

[adio 5,000+ posts]

There is no way that you can look at amplifier specs listed on the internet and plug them into a formula and expect to find out what the amplifier will reproduce.

i was hopin i could. i didn't want anything precise, just something in the ballpark.

 

[GemaRastem 10+ year member]

are u super duper sure?? the profile is rated at 255 watts per channel, and most profile amps are overrated. thanks for the help though, this is exactly what i was looking for. anybody else, please chime in.

Thats the mathematics, but like I said, that is at perfect class AB efficiency, which the profile amp probably doesn't have. if it were say, 50% efficient, instead of

65% it'll only put out 215 watts per channel

 

[n2audio 5,000+ posts]

For starters...

It can't bring anymore current then that in or else it blows a fuse. P=VI

That statement's false. There are plenty of amps out there that will produce more power than their fuses would indicate.

Fuses take time to heat up and blow. Dynamically, they can pass 2x their rated current w/o blowing.

It seems that profile tends to use larger than req'd fuses, but every case I've ever heard of from people doing power tests with them say they're over-rated, but not by much.

I think that guideline is going to be more accurate than any equation you can come up with using fuse size.