Sol Mandlsohn opened a small radio shop in 1946. Seven-plus decades later, this is still the top spot for FM dials, though it sells far more than radios these days. High-fidelity turntables, top-tier headphones (in all the permutations, including in-ear, wireless, Bluetooth, noise-cancelling), speakers, projectors, flatscreens. You name it, odds are they’ve got it.