Mackie SRM650 Owners Manual - Page 11

Owner's Manual SRM550/SRM650 Loudspeaker: Rear Panel Features continued... To connect balanced lines to these inputs, use a 1/4" Tip-Ring-Sleeve (TRS) plug. "TRS" stands for Tip-Ring-Sleeve, the three connection points available on a stereo 1/4" or balanced phone jack or plug. TRS jacks and plugs are used for balanced signals and stereo headphones and are wired as follows according to standards specified by the AES (Audio Engineering Society): 8 9 10 SIG/OL SIG/OL Balanced 1/4" TRS Connector Sleeve - Shield (ground) Tip - Positive (+ or hot) Ring - Negative (- or cold) 4 7 RING SLEEVE SLEEVE RINGTIP TIP RING TIP SLEEVE Balanced 1/4" TRS Connector To connect unbalanced lines to these inputs, use a 1/4" mono (TS) phone plug, wired as follows according to standards specified by the AES (Audio Engineering Society): Unbalanced 1/4" TS Connector Sleeve - Shield (ground) Tip - Positive (+ or hot) SLEEVE SLEEVE TIP TIP TIP SLEEVE Unbalanced 1/4" TS Connector For more information on these connectors, see Appendix B on page 21. 4. Gain Knobs The gain knobs adjust the input sensitivity of the mic and mic/line/RCA inputs. This allows signals from the outside world to be adjusted to run through each channel at optimal internal operating levels. There is - dB of gain with the knob fully down (off), ramping up to 50 dB of gain fully up (max). The accompanying LED will illuminate green when the channel's input signal is present, indicating signal. It will remain lit so long as there is signal above -20 dBu present in that channel. 3 5 6 The accompanying LED will illuminate red when the amplifier in the SRM loudspeaker is near the clipping point. It is okay if this LED blinks occasionally, because this means that the transient peaks are just reaching the maximum output of the amplifiers and you are getting the most out of your loudspeaker. If connecting mixer outputs to loudspeaker inputs, set the gain knob to 10:00 ["Line"] for optimal sound and performance. 5. RCA Inputs [Channel 2 Only] The stereo unbalanced RCA inputs allow you to play a CD player, iPod®, or other line-level source. The RCA jacks accept an unbalanced signal using standard hi-fi [RCA] hookup cables. NEVER connect the output of an amplifier directly to the input of the loudspeaker. This could damage the input circuitry of the active loudspeaker. They are wired as follows, according to standards specified by the AES (Audio Engineering Society): Unbalanced RCA Connector Sleeve - Shield (ground) Tip - Positive (+ or hot) SLEEVE TIP SLEEVE TIP Unbalanced RCA Connector For more information on these connectors, see Appendix B on page 21. Owner's Manual 11