The DJM-850’s 24-bit, 96KHz audio interface has four stereo inputs and four stereo outputs, and is Traktor Scratch compatible. It comes with a decent set of low-latency ASIO drivers, and the sample buffer’s ranged between 64 and 1920 samples. We experienced only the occasional click and pop when using TS Pro 2 with a 64-sample buffer and two CDJs, but that’s still too many for us. We found a 128-sample to be most comfortable. Of course, the faster and more efficient your PC, the better the performance will be.
To alter settings, you use Pioneer’s audio interface utility, which is well organised and shows you the current inputs that are selected for each channel, such as phono, CD and USB, and the input type that is to be passed to your PC from each channel, such as phono timecode, the left-hand side of the crossfader and the microphone. As an example, you can have channels one, two and three sending line-level timecode to your PC and channel four sending audio from the record output, so that you have three decks supplying timecode and the fourth channel sending audio that’s to be recorded by Traktor’s audio recorder. Of course, you must also configure Traktor to accept these inputs, but the utility gives you a lot of freedom to pass different audio sources to Traktor. It also means you can have a combination of timecode inputs that suits your setup, such as phono timecode on inputs one and four, and CD timecode on channels two and three. The sound quality of the audio interface is adequate for a mixer of this price. It isn’t terrible and didn’t disappoint, but neither did it blow us away.
Almost all of the DJM-850’s controls, even the crossfader assign switches, curve switches and headphone controls, transmit MIDI data to external devices or software, but in practice this is more of a convenience than a killer feature. The switches, buttons and faders still affect audio when in MIDI mode, which means MIDI’s best used for controlling non-audio software functions such as video faders and video effects in VDJ, or controlling Traktor’s global controls with the Fader Start buttons. You can also transmit timing data over MIDI to keep external sequencers synced, but the right BPM isn’t always successfully sent to the external device or software. As an example, the DJM-850 may pass the correct timing information of a UKG track to Ableton Live, but it’ll then interpret the breakdown of the same track as 169bpm instead of 138bpm, completely throwing out the synchronisation of tracks playing in Ableton Live. If you want to control software with MIDI, you need to complement the DJM-850 with a modular MIDI controller. It’s a handy feature, but no more.
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I used two 1210s and two CDJs (I used a pair of Stanton STR8-150s – Ed), with three decks playing loops and the fourth deck being scratched, along with a 64-sample buffer. Surprisingly, there were no audio issues, although a comfortable sample buffer depends on the performance of your PC. Everything works as advertised, and it’s a lot more convenient and tidy to use the DJM-850’s built-in audio interface than an external one.
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The DJM-850 has four colour effects rather than the DJM-900’s six. The effects are a white noise generator, a bit crusher, a filter and a gate. New for the DJM-850 is a beat button that pulses the effect in time to the beat. As an example, the Noise effect cuts out on every beat, giving it a rhythmic quality. The beat button works best with Gate effect, where it acts as a subtle stutter effect with a metallic sound. All colour effects can be used in combination with the regular beat effects and are worthwhile and usable.
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There’s a lot of space around the Colour FX pots, which means you can twist them without hitting any other control, even if you’re twisting adjacent controls at the same time. Filter’s pretty basic, but it has some resonance. Noise is a high impact white noise generator that’s best applied to an empty channel and the Crush effect can be handy if applied to an acapella or during breakdowns, but it’s a bit unsubtle.