The EUROLIVE B1200D packs everything there is to love about these powerful systems into a more compact, easy to transport enclosure, making them ideal for small- to mid-sized venues. Armed with a 500-Watt Class-D amplifier and a host of truly professional features, these little brutes crank out tons of tight, low-end punch—with the definition and clarity typically reserved for much larger systems. Put simply, these cool-running systems provide an impressive power-to-weight ratio—and our no-compromise design means you get amazingly deep, chest-pounding bass that will keep the party going all night long. Instead of operating relatively continuously like Class AB circuits, Class-D amps switch on and off thousands of times per second, delivering power only when needed. The amplifier is either fully on or fully off, which significantly reduces power losses from the output devices given off as heat. Less heat means our Class-D amps don't need massive heat sinks, and that means we can make them lighter. Plus B1200D's amplifier provides all the dynamic punch and fidelity you'd expect from a much larger, more expensive subwoofer. The B1200D features balanced XLR inputs and outputs, as well as balanced XLR Thru jacks for connecting additional enclosures. A Boost Frequency knob lets you boost any frequency between 45 Hz and 90 Hz. Then just flick the Boost switch to give your selected frequency a +10 dB boost. We've also provided a High Cut dial that controls the upper-corner frequency for the internal amplifier without affecting Thru A/B signals. A Level knob controls the input gain, and the Phase switch reverses the output phase to compensate for frequency cancellation between the subwoofer and satellite speakers. LEDs show operational status at a glance including power, signal present and input overloads.