Impedance question


I have a Jolida 202 integrated tube amp, it has terminals for both 8ohm and 4ohm speakers and puts out 40watts max to for both 4 and 8. My question is, if I were to use 4ohm speakers does the amp have to work harder to drive them than it would with 8ohm speakers? Also would the volume be the same if I were to compare two sets of speakers both with a sensitivity of 87db, difference being one is 8ohm nominal the other 4ohm?? The reason I ask is I'm planning to upgrade my speakers and have steered clear of 4ohm speakers because I'm unsure how it affects the sound and performance of both amp and speakers. You're input would be very much appreciated. Thanks
rdylan

Showing 1 response by elevick

Generally speaking, most 4 ohm speakers are less sensitive than most 8 ohm speakers. Since tube amps don't double wattage when halving impedance, you will be hard pressed to find 4 ohm speakers with decent efficiency. As stated by Newbee, look for at least 90db.
Final note, 4 ohm speakers can be run off of 8 ohm taps usually without any adverse effects to the amp. Use which ever taps sound best.