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[title] Final Thoughts
[* black] Time (hours) = Battery Capacity (mAh) / Current (mA)
[* black] Standard 9V D battery capacity: 565mAh
[* black] Average music listening volume current draw: 25mAh
[* black] 22.6 Hours = 565mAh/24mA
-[* black] It is worth powering with wire and not battery if using the Crush Mini as an office speaker, since it would require a new 9V D battery every 22.6 hours.
+[* black] If using the Crush Mini as an office speaker, it is worth powering with wire and a not battery since it would require a new battery every 22.6 hours.
[* black] However, most inexpensive switching-type power supplies are noisy, and that noise is audible through the amplifier. A regulated linear power supply would be ideal. I was able to use a benchtop switching power supply with a lower noise floor. It is tolerable but not a permanent solution.