[. . . ] Professional 2-Way 120-Watt Powered Monitor QUICK START MANUAL Front and Rear Panel Features 1. [. . . ] Precision Tuned Bass Port: Enhances the bass response of the ProLinear. Input Level Control Knob: Used to adjust the strength of the signal coming into the speaker. This allows all types of audio sources to be used, from stand-alone CD players to professional mixers. XLR/TRS Audio Input: Female XLR and 1/4" TRS balanced combination input connector. IEC Power Connector: Provides power from a 100-230V, 50-60 Hz A/C power source. Connecting and Starting the ProLinear 1. Connect the audio source's output to the speaker with a TRS or XLR connector. [. . . ] With the audio source material playing, gradually turn up the Input Level control until the speaker is playing the audio material at a comfortable level. SPECIFICATIONS Inputs Nominal input level: Maximum input level: Input impedance: +4dBu (1. 23 Vrms) +20dBu (7. 75 Vrms) 10k Output Low Frequency (LF) power: High Frequency (HF) power: ProLinear 720 Max Peak SPL per pair: Frequency response: ProLinear 820 Max Peak SPL per pair: Frequency response: 80 Watts RMS (130 Watts Peak) 40 Watts RMS (130 Watts Peak) ~109 dBSPL (1m / Max input below clipping) 50Hz ­ 20kHz ±1. 5dB Bass level -3dB @ 43hz typical ~111 dBSPL (1m / Max input below clipping) 45Hz ­ 20kHz ±1. 5dB Bass level -3dB @ 40hz typical 100VAC ­ 230VAC 47 ­ 63 Hz 20 Watts Idle (150 Watts Peak) Power Requirements Input voltage: Input frequency: Power consumption: Environmental Requirements Temperature range: 0-40 degrees C Relative humidity (non-condensing): 30-85% Cabling Requirements Source to Speaker: Balanced or unbalanced, shielded; XLR or 1/4" TRS connector 15" x 9" x 12" (380mm x 230mm x 305mm) 25 lbs (11. 4 kg) 17. 5" x 11" x 13. 5" (445mm x 280mm x 345mm) 33 lbs (15 kg) 7-51-0143-A Mechanical ProLinear 720 Size (HxWxD): Weight: ProLinear 820 Size(HxWxD): Weight: [. . . ]