Noun
(baseball) The areas of deep right-center and deep left-center field where home runs are most likely to be hit.
At Oakland Coliseum, it's 388 feet from home plate to the power alley.
(audio engineering) The line between two subwoofers where both are in phase.
Source: en.wiktionary.orgPower Alley Fitness describes itself on its website as a fitness facility that’s in a fight with Washington’s government over its constitutional rights, and it asks for donations to help pay for legal fees. Source: Internet