Audio Video Revolution Forum - View Single Post

CharlyD · 05-13-2008

Sorry, I was trying to simplify things and went a bit too far. Speaker sensitivity is measured with a standard voltage (not power) input. The voltage used is 2.83VRMS which would equate to 1 Watt at if the speaker was 8 Ohms (P = (V^2)/R). I only looked at the JBL spec page for these speakers which lists their impedance at 8 ohms. Since the JBLs are actually closer to 4 ohms, the power input would be closer to 2 watts at that voltage. Make sure the amplifier you're considering will drive 4 ohms and don't cut corners on power. The amp will still have to drive considerable current through these speakers.

05-13-2008	#29
CharlyD Member Join Date: Sep 2007 Location: Seattle Posts: 47	Re: Pairing Amps with Speakers Sorry, I was trying to simplify things and went a bit too far. Speaker sensitivity is measured with a standard voltage (not power) input. The voltage used is 2.83VRMS which would equate to 1 Watt at if the speaker was 8 Ohms (P = (V^2)/R). I only looked at the JBL spec page for these speakers which lists their impedance at 8 ohms. Since the JBLs are actually closer to 4 ohms, the power input would be closer to 2 watts at that voltage. Make sure the amplifier you're considering will drive 4 ohms and don't cut corners on power. The amp will still have to drive considerable current through these speakers.