A passive radiator speaker may sound slow with a tube amplifier that has a low damping factor. Sealed speakers tightens up the bass by default.
But, with an amplifier having a good damping factor? A passive radiated speaker can sound as tight as sealed, but having more dynamics than a sealed can allow for at higher volumes.
But, with an amplifier having a good damping factor? A passive radiated speaker can sound as tight as sealed, but having more dynamics than a sealed can allow for at higher volumes.