As mentioned above, the sole differentiating factor between m-audio‘s bx3 and bx4 monitors is in size and performance. otherwise, based on looks and tone, they hold essentially the same features. each one houses military-grade woofers, made of black kevlar, and natural silk dome tweeters. the bx3’s woofer ′′, where the bx4 contains a 4.5′′ one. similarly, m-audio included a rear port on each model to enhance low-end performance overall. these are settled into an acoustically-inert mdf cabinet. both sets of monitors top off at an impressive 120 watts of power and assure crystal-clear quality throughout.
on the back side, the monitors have two pairs of stereo inputs, one rca set for unbalanced, and one 1/4′′ set for balanced signals. here, users can also find an indicator switch to which speaker they want as the active one. two eq knobs sit just to the right of the inputs, allowing +/- 6db of gain in the highs and lows.