Signal mixing with the K-2500

You're using a K2500 as your main controller or at least have one in your setup? You're using more than one sound module / output? You're carrying a submixer with you which has some weight and at least takes away space for further equipment? Okay, so read on:

First of all - since most keyboardists are using a submixer, what's the use of it? You don't need an EQ on your synths (sounds are too different anyway to have one static EQ setting) or a reverb (if needed you program the reverb in the patch), even the individual volumes should be adjusted by MIDI (or do you manually move the faders for every sound in your setup?). So this leaves the submixer to mix all the signals from your outputs to provide the PA-guy with a simple stereo output.

The most simple way to do this in setups up to 3 further soundsources besides the K2500 is this:

The K2500 provides you besides the master output with 4 Inserts (A, B, C, D). Insert means that you can route programs / layers to these outputs, send them through an external device (filter, compressor...) and get the edited signal back through the insert-jack. The return signal will then be mixed with the other signals and sent to the master output. Now what we're gonna do is to use the return-side of the inserts to send the outputs of our sound modules to the master output of the K2500, together with the K2500's signals.

As shown in the graphic, an insert-jack is like a standard stereo-jack, but dealing with mono signals the tip is used for the send-signal while the ring provides the return-signal. So you simply have to weld yourself a set of standard audio-cables providing:

  • a mono-jack at the one side (for your sound-module)
  • a stereo-jack at the other side (going into the inserts of the K2500), leaving the tip empty and instead connect the ring
  • Mass is connected like usual.

Now connect your sound module to your K2500, switch them on (K2500 must be activated to hear something) and you'll have both your K2500 signals and your modules signals available at the outputs of your K2500.

Still as you might have noticed there are some restrictions:

  • You can't use insert A, since this is a special output, redirecting all master-signals in your K2500 to this output as soon as a jack is plugged in (you can still send a signal into the K2500 using A, but you loose the internal sounds).
  • Therefore the maximum number of external synths is limited to 3
  • Depending on your setup it might not be comfortable to have cables from your modules to the K2500 (for example a K2500 keyboard controlling a rack, thus having 6 more cables from rack to keyboard)

Still it's a very simple and effective way to get rid of the submixer. And the IMO biggest advantage in case you're playing a K2500 keyboard version, last but not least: you have the main volume of the whole setup directly at your fingertips using the K2500's volume slider.

Let me know if this worked for you :-)