It supports an external amplifier with 10-125 Watts of power (versus 10-100 Watts), not to mention an improved frequency range of 65Hz-25kHz (versus 86Hz-25kHz) and a larger subwoofer (versus 4.5”). The HS 50, however, maintains all of the HS 40’s other features, such as a proprietary Deep Channel driver for smooth/consistent bass, a heavily-braced ABC enclosure meant to reduce unwanted resonances, a Reduced Baffle Diffraction Design for wider/smoother sound dispersion, and MagnaGuard video shielding. In addition, the HS 50 features adjustable footing, 5-way gold-plated binding posts, built-in-wall mounting brackets, and a soft-touch finish (Mist or Midnight) with an optional color-coordinated P.O.P. grill for $27.99. The Boston Acoustics HS 50 is priced at $149.99, a $50 increase in price from the inferior HS 40 and a $250 savings from the lavishly-designed and super-elegant $399.99 VS 240.