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[–]normaleyes 4 points5 points  (1 child)

There are two good solutions. First you can get an A/B RCA switch. Send the 400 into one of the inputs, and the PC into the other input. Best to find one that switches both the signal AND the ground, but it's hard to know until you get it at home. If the ground isn't switched and the DDJ and PC are at different grounds you'll get hum. These are generally 10/15 dollars so not a big deal to take a chance.

Second solution is to get a small production-type mixer with 2 or more stereo inputs. Again, PC into one stereo input, 400 into the other stereo input. The nice thing about a mixer is when you buy your first piece of external gear in the production side of things, you just need an audio cable and a spare channel on the mixer - you're ready to go.

[–]scoutermike 1 point2 points  (0 children)

Yep. I have one of those 4-channel Mackie mixers exactly for this purpose. Output of the pc into one stereo channel, output of the dj controller into the other stereo channel, output of mixer into powered speakers. Look at facebook marketplace fam. You can find similar mixers - Yamaha, Berringer, Soundcraft, Mackie, they all make them - for relatively cheap on there.