Most speakers rated sensitivity is for an anechoic chamber, however some companies will show a room sensitivity which is generally 3db higher. You should consider the 88db. Also, the RC-10's have a nominal impedance of 8 ohms, with a 4 ohm minimum. This may not be the best match for a tube amp. I think the RC-10's would be better with a high quality SS amp, or use different speakers with the tube amps.
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