(2) Presonus R80 150w Active Powered 8" AMT Studio Monitors with Ribbon Tweeter 150w Active Powered 8 AMT Studio Monitor with Ribbon Tweeter. Power and safety;Biamped 150W RMS (LF = 100W, HF = 50W), Class D power amplifier with switching power supply;RF interference, output current limiting, over temperature, turn-on/off transient, and subsonic filter protection;Energy Conservation Mode (with enable/disable) lowers standby power to &lt;0.5W;External mains fuse Components and construction; 2-way active AMT design provides articulate high-frequency response and wide stereo imaging;Custom-designed, 6.8-inch, AMT ribbon tweeter responds to the subtlest waveforms and the highest frequencies;6.5/8-inch Kevlar LF drivers provide transparent mid- and low-frequency reproduction for clean sound and punchy bass;Balanced XLR and -inch TRS plus unbalanced RCA inputs provide flexibility for seamless integration into any environment User controls;Acoustic Space settings (Linear, -1.5 dB, -3 dB, -6 dB) compensate for room placement. 1- Balanced XLR, 1- Balanced  TRS, 1- Unbalanced RCA. Frequency Response: 40 Hz  22 kHz, Crossover Frequency: 2.6 kHz. LF Amplifier Power: 100W Class D, HF Amplifier Power: 50W Class D. Peak SPL (@ 1 meter): 107 dB, LF Driver: 8 Kevlar, HF Driver Type: AMT Diaphragm: 6.8-inch2 (4,400 mm2), Equiv. Diaphragm : 3 (75 mm) Input Impedance: 20 k balanced, 10 k unbalanced. SNR (typical, A-weighted): &gt;100 dB, Volume Range: A-type taper. HF Driver: Linear, +1 dB, -3 dB, -6 dB, Highpass filter: Linear, 60 Hz, 80 Hz, 100 Hz. Acoustic Space: Linear, -1.5 dB, -3 dB, -6 dB, Energy Conservation Mode: On/Off/Query Protection: RF interference,Output-current limiting,Over-temperature,Turn-on/off transient,Subsonic filter,External mains fuse. Factory preprogrammed: 100-120V 50/60 Hz or 220-240V 50/60 Hz. Standby Power: &lt; 0.5W, Vinyl-laminated, medium-density fiberboard. Width: 9.5 (241 mm), Depth: 12 (309 mm), Height: 15 (379 mm), Weight: 19.8 lbs (9 kg)