User guide

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2. Connecting Scarlett 18i20 to loudspeakers
The 1/4” jack MONITOR outputs on the rear panel (Line Outputs 1 and 2) will normally be used
to drive monitoring speakers. Self-powered monitors (e.g., typical computer speakers) incorporate
internal amplifiers, and may be connected directly. Passive loudspeakers will require a separate
stereo amplifier; in this case, the rear panel outputs should be connected to the amplifier’s inputs.
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All the line output connectors are 3-pole (TRS) ¼” (6.35 mm) jack sockets, and are electronically
balanced. Typical consumer (hi-fi) amplifiers and small powered monitors will have unbalanced
inputs, either on phono (RCA) sockets, or via a 3.5 mm 3-pole jack plug intended for direct connection
to a computer. In either case, use a suitable connecting cable with jack plugs at one end.
Professional power amplifiers will generally have balanced inputs.
When mixing, you can connect several pairs of additional speakers (mid-field. near-field, etc.) to
pairs of outputs and use Scarlett MixControl to route your mix to the different outputs as desired, to
check your mix on the different types of speaker.