Boston Acoustics A 250 Dual 5.25-Inch Woofer Two-Way Floor Standing Speaker (Gloss Black) Scratch-resistant high-gloss finish with contrasting "leatherette" accents for stunning good looks. Boston's 1-inch Kortec soft dome tweeter deliver smooth, extended high frequency response. Advanced ceramic/glass fiber polymer woofers in acoustically tuned ported enclosures feature Deep Channel Design (DCD) deliver improved bass response with less amplifier power. Easy hook-up 5-way gold-plated binding posts provide total hook-up flexibility Frequency Range 45Hz - 25kHz, recommended Amplifier 15 - 175 Watts