Lisa had been using the same monitor wedge for seven years. She brought it to every gig, insisted it was positioned exactly twelve inches from the mic stand, and threatened career-altering consequences to anyone who moved it. She said it had 'her sound.' Engineers learned not to argue.

When the wedge finally blew a driver and needed replacement, Lisa rejected the identical replacement model. 'It doesn't sound right,' she said. Same brand, same model, same settings. But she was correct — it did sound different. The original wedge had been wired with reversed polarity since the day the speaker cable was soldered by a hung-over technician in 2019.

Lisa's out-of-phase wedge had been cancelling frequencies where the wedge and the PA overlapped at the vocal mic position. This created a characteristic scooped mid-range that Lisa had internalized as 'her sound.' The cancellation also reduced low-frequency build-up, which meant less proximity effect at the mic, which made her voice sound thinner and more present — an effect she achieved accidentally through a wiring error that most engineers spend hours trying to create deliberately.

The replacement wedge, correctly wired, summed constructively with the PA. More low-mids. More body. Lisa hated it. 'It sounds muddy,' she said. We reversed the polarity. She smiled. 'That's my sound.'

The Moral: Phase interaction between monitors and PA is real and audible. SonaVyx's phase measurement can quantify these interactions — and sometimes the 'correct' wiring isn't the one that sounds best in context.