The HR624 is a THX-approved, 6", 140-watt, 2-way active reference monitor with the legendary accuracy of Mackie's HR824 in a compact, lighter-weight, lower-priced package. The HR624 is designed to work perfectly with the HRS120 active sub as well as the HR824 active 8" monitor in surround installations. It's the ideal choice for any studio that's looking for the best combination of features & value. Its 6" woofer offers smooth, detailed mids with the same clarity & punch as the HR824. HR624's boast wide frequency response of 52Hz - 20Hz +/-1.5dB, and they come with a certificate to prove it. Given its high output & small siz