What’s the relationship between gain (dB) and power (watts)?

Is there one? My new used 300+ epic Bryston amp has a gain switch on the back toggling between 23 and 29 dB of gain.

redwoodaudio05-30-2021 3:48am

imhififan Details Discussions Posts This discussion Message User 2,127 posts 05-31-2021 at 02:40am Copy Comment URL Report Comment Edit Delete If the amp is rated 300Watt at 8Ω, gain set to 23dB, the amplifier need 3.5Volt input signal in order to output 300Watt at 8Ω, If the gain set to 29dB, the amplifier need 1.75Volt input to output 300Watt at 8Ω. Its depends on the max. output voltage of your preamp, set the gain on your power amp accordingly.
imhififan Details Discussions Posts This discussion Message User 2,127 posts 06-01-2021 at 02:13am Copy Comment URL Report Comment Edit Delete The gain switch is a nice feature on the power amp, 23dB of gain can give most active preamp better range of volume control, but passive preamp might need 29dB gain to drive the amp to full power. Why not call Bryston to get the answer?