Nalo1022 Posted January 8, 2004 Report Share Posted January 8, 2004 i was wandering if there was any way to add a resistor or some thing somewhere to make an amp think that a 8ohm spekaer was 4 ohms or vice versa......now i know directly pluggin ac etian ohm speaker into an amp meant for another can be detrimental but is there anything i can do to trick the amp? Quote Link to comment Share on other sites More sharing options...
jbkim Posted January 8, 2004 Report Share Posted January 8, 2004 Two 8ohm speakers in parallel will net 4ohms. Quote Link to comment Share on other sites More sharing options...
MikeB Posted January 8, 2004 Report Share Posted January 8, 2004 you could put a big resistor of 8ohm across the terminals, then its electrically 4 ohm, but this will change the damping of the speaker ALOT, and i wouldnt do it ever!! what type of amp, SS or tube? Quote Link to comment Share on other sites More sharing options...
MikeB Posted January 8, 2004 Report Share Posted January 8, 2004 nyjbkim Posted on Jan 8 2004, 08:52 PM Two 8ohm speakers in parallel will net 4ohms. exactly!! but i was thinkin of how to do it with 1 speaker, if he doesnt want to get another, wants to save room etc.... mike Quote Link to comment Share on other sites More sharing options...
KeithHowell Posted January 9, 2004 Report Share Posted January 9, 2004 You would need to use a matching transformer to do it properly. If it is a tube amp you might find there are taps on the output transformer to select 4, 8 , 16 ohm anyway. Keith Quote Link to comment Share on other sites More sharing options...
Kevan Posted January 9, 2004 Report Share Posted January 9, 2004 Here's a great diagram: http://www.webervst.com/pics/zplot.gif I have one printed out and in my work area. Saves me from doing (simple) math. :-) Quote Link to comment Share on other sites More sharing options...
KeithHowell Posted January 9, 2004 Report Share Posted January 9, 2004 The formulae for calculating series and parallel impedances/resistances and capacitances are as follows: Impedance and resistance: Series R = R1 + R2 + ..... Rn Parallel : 1/R = 1/R1 + 1/R2 + ..... 1/Rn For capacitance it is just the opposite: Parallel caps add and series you sum the inverse Parallel: C = C1 + C2 + ..... Cn Series: 1/C = 1/C1 + 1/C2 + ..... 1/Cn Keith Quote Link to comment Share on other sites More sharing options...
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