matt402 Posted May 28, 2011 Report Share Posted May 28, 2011 ac voltage x ac amperage will be how much power ac voltage / ac amperage is the your ohm load.... if you are doing just straight burps... This explains why you come up with different numbers than I do.. Sukka i learned the same way derrick does it... i tried it both ways & was only hundredths off on wattage... Quote Link to comment Share on other sites More sharing options...
Ray Posted May 28, 2011 Report Share Posted May 28, 2011 You can both do it wrong.... Its cool...lol All good either way Quote 2008 California state record holder 157.2 Bassrace2009 California state record holder 157.0 BassraceRollin 50's 158.7db2009 King of Cali Bassrace2009 USACi score 160.5 @ 42hz Link to comment Share on other sites More sharing options...
bkolfo4 Posted May 29, 2011 Report Share Posted May 29, 2011 (edited) If you do not have a clamp, you can use a known value non-inductive resistor in series with the sub to make an impedance plot. 20 watt 8 ohm are cheap at parts express. Measure the voltage at the amp and across the resistor with the resistor in series with the sub. Current = voltage across the known resistor / resistor value Sub resistance value = (voltage at the amp - voltage across the resistor) / current Edited May 29, 2011 by bkolfo4 Quote Current system: 1997 Blazer - (4) Customer Fi NEO subs with (8) American Bass Elite 2800.1s Previous systems: 2000 Suburban - (4) BTL 15's and (4) IA 40.1's = 157.7 dB at 37 Hz. 1992 Astro Van - (6) BTL 15's and (6) IA 40.1's = 159.7 dB at 43 Hz. Link to comment Share on other sites More sharing options...
bkolfo4 Posted May 29, 2011 Report Share Posted May 29, 2011 You guys crack me up. Ohm law is a law. It is not one of those things that works different in theory vs. real life. Voltage x voltage / resistance Is the same thing as Voltage x current And think about it for minute - you just got resistance from voltage / current, so it is the exact same thing. . .you calculated resistance from the same current - it is just skipping a math step. Any error would be slight from rounding, or you are calculating something wrong. Quote Current system: 1997 Blazer - (4) Customer Fi NEO subs with (8) American Bass Elite 2800.1s Previous systems: 2000 Suburban - (4) BTL 15's and (4) IA 40.1's = 157.7 dB at 37 Hz. 1992 Astro Van - (6) BTL 15's and (6) IA 40.1's = 159.7 dB at 43 Hz. Link to comment Share on other sites More sharing options...
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