The CDJ 850 is one of the best and most affordable solutions to having a CDJ set up. It is made by Pioneer and for years they have been making these CDJ units and they are very well built and constructed. The CDJ 850 is one of the cheaper ones when it comes to price, not cheap in quality. For less than a 1 grand, the CDJ 850 almost has the same features as the 900 models except the 900 models cost a lot more.
The CDJ 850 has top of the line mixing features and an unprecedented sound quality. You can pull all of your files and music from CD’s USB drives or external hard drives, and it plays WAV, AAC, AIFF and almost any other type of audio file that is used. Keep your computer at home with the CDJ 850 like you do with the 950 because all of your stuff can just be on USB drives. So what is really the difference between the 850 and the 900 besides the price. Well for starters I think the 900 has a better build to it, and a more stylish design. In my opinion that is the main thing that is the difference with the two. The CDJ 850 seems to be more for a DJ that is a beginner or with a smaller budget to work with and needs a CDJ device.
The CDJ 850 comes with a DJ management software called Rekordbox, its not the best software for DJ management but its pretty darn good for it to be free with the CDJ 850.
The face of the CDJ 850 is made so that the DJ has the quickest control and access to the music files. And with the WAV running across the screen you will have the proper visuals you need to be able to mix properly as well as have the artist name, and BPM of the song right there in front of you. The CDJ 850 is a low priced machine with everything a DJ needs. It would be my first unit if I was just starting out.