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Sound Reinforcement - Forums for Live Sound Professionals - Your Displayed Name Must Be Your Real Full Name To Post In The Live Sound Forums => LAB: The Classic Live Audio Board => Topic started by: Danijel Foler on February 11, 2011, 03:42:12 am

Title: amps current draw and one service need if possible
Post by: Danijel Foler on February 11, 2011, 03:42:12 am
hello
I need to choose portable generator (with avr regulator) for my portable sound system. Amp never will clip. subwoofer amp work only from 30-125hz with 24db/okt slope. mid-high amp will work from 125hz-20000hz with 24db/okt slope.

1. Is this limited spectrum lower current draw and how much, especialy with mid-high where no any heavy load from bass spectrum?

2. Service: ideally if someone have current draw meter and some amp to make pink noise test (maybe with some real music) just bellow clipping with and without crossover filters. I think that this results can help many installers.

thanks

update:
here is analyzed sound spectrum one electronic song:
picture one: full spectrum
(http://img585.imageshack.us/img585/6470/full.gif)

picture 2: filtered with butterworth 24db/okt 30-125hz (subwoofer amp)
(http://img820.imageshack.us/img820/3280/bass30125.gif)

picture 3: filtered with butterworth 24db/okt high pass 125hz (mid-high amp)
(http://img805.imageshack.us/img805/2195/midhigh12520000.gif)

on above picture we can view that average rms power drop from 4-6dB when filters is applied. Do I can use this numbers for calculating current draw (-3dB=1/2 power)?