Mackie PPM1012 Owner's Manual - Page 30

PPM1012 Speakons When using the Speakon outputs to connect your loudspeakers, wire the Speakon connectors as shown below: MONO PLUG Channel Insert jack Direct out with no signal interruption to master. Insert only to first "click." Figure E 1- 1+ COLD HOT 1- 1+ 2+ 2- MONO PLUG Channel Insert jack Direct out with signal interruption to master. Insert all the way in to the second "click." TRS Send/Receive Insert Jacks Mackie's single-jack inserts are the three-­conductor, TRS-type 1⁄4" phone. They are unbalanced, but have both the mixer output (send) and the mixer input ­(return) signals in one connector. See Figure F. ring tip sleeve (TRS plug) SEND to processor "tip" This plug connects to one of the mixer's Channel Insert jacks. Figure F "ring" RETURN from processor The sleeve is the common ground (earth) for both signals. The send from the mixer to the ­external unit is carried on the tip, and the return from the unit to the mixer is on the ring. Using the Send-only on an Insert Jack If you insert a TS (mono) 1⁄4" plug only ­partially (to the first click) into a Mackie ­insert jack, the plug will not activate the jack switch and will not open the insert loop in the ­circuit (thereby allowing the channel signal to continue on its merry way through the mixer). This allows you to tap out the channel signal without interrupting normal operation. If you push the 1⁄4" TS plug in to the second click, you will open the jack switch and create a ­direct out, which does interrupt the signal in that channel. See Figure G. NOTE: Do not overload or short-circuit the signal you are tapping from the mixer. That will affect the internal signal. STEREO PLUG Channel Insert jack For use as an effects loop. (TIP = SEND to effect, RING = RETURN from effect.) Figure G Loudspeaker Cable Use loudspeaker cables with a minimum conductor size for the length you need as listed in these tables. This will minimize power losses to less than 0.5 dB. The cable lengths listed are "up to" lengths. For inbetween lengths, use the next larger conductor gauge. Using larger than the recommended conductor size is always permissible. Using smaller than recommended conductor size will result in higher power losses. Minimum AWG 18 16 14 12 10 4 ohm 10 ft 25 25 50 100 8 ohm 25 ft 50 75 125 200 Min Metric WG 4 ohm 12 3 m 14 8 16 8 20 15 25 30 8 ohm 8 m 15 25 40 60 The recommended conductor gauges are listed for AWG (American Wire Gauge) and Metric WG (Metric Wire Gauge). Note that smaller AWG numbers = larger conductors and smaller Metric WG numbers = smaller conductors. The Metric WG is equal to ten times the nominal conductor diameter in millimeters. Longer Lengths 30 PPM1012 For cable lengths over 200 feet / 60 m at 8 ohms, and over 100 feet / 30 m at 4 ohms, the conductor sizes needed for less than 0.5 dB power losses are rarely practical for physical and cost reasons. As a practical compromise for these situations the recommended conductor gauge is 10 AWG or 25 metric.