Using Channel Inserts

In addition to using Auxiliary sends and returns to access outboard devices, the MPL 1640 also provides channel inserts for input channels 1 - 12 as well as for the Main Mix and Bus 3/4 outputs.

Channel inserts should be used when you want to affect just one signal, as opposed to signal from several channels—most often, this will be for dynamic processing purposes (such as outboard equalization, compression/limiting, or noise gating). Channel insert signal is returned just before the channel fader; for this reason, the output level of external devices connected to MPL 1640 channel inserts should always be set to unity gain. You can also use the channel insert sends as post-eq (but pre-fader) direct outputs, if you need to route a single monophonic signal to an external device such as a tape deck.

CH 12	CH 11	CH 10	CH 9	CH 8	CH 7	CH 6	CH 5	CH 4	CH 3	CH 2	CH 1
				CHANNEL INSERT		(TIP RETURN - RING SEND)

The Main Mix and Bus 3/4 inserts are useful when you want to effect the entire mix with a device such as a room equalizer or stereo compressor/limiter. The Main Mix insert signal is returned just before the Main L/R faders, and the Bus 3/4 insert signal is returned just before the Bus 3/4 level control.

All rear panel insert jacks accept 1/4" TRS plugs, with the ring carrying the send signal and the tip carrying the return signal; this will normally be connected to a Y-cable (see the “Connecting The MPL 1640” section on page 10 for a wiring diagram). This configuration is sometimes known as an “effects loop,” since the signal is sent and returned over the same cable.

If nothing is plugged into insert jacks, they have no effect—but if you connect them to a passive device like a patchbay, you’ll need to normal (permanently connect) or half-normal(connection is made unless overriden by a patch cord) the send to the return.

BUS INSERT

MAIN MIX

3L - 4R