One can't emphasize this enough since with any decent recording [> +20 dB headroom, which is still highly compressed compared to symphonic music's +30 dB in the critical 250-500 Hz hearing acuity BW] the dynamics will be compressed to a greater or lesser extent with all but the most efficient speakers once above MUSAK [elevator] levels.Keep in mind that the clipping behaviour is more important than the absolute power.
Mid 90s. Umless the room is BIG and you play really loud, 4w should be finr. Keep in mind that the clipping behaviour is more important than the absolute power.
dave