Sound quality is bad

@Sam > Have you checked that the audio buffer settings are correct? I use both Serato DJ and rekordbox DJ and haven't noticed any appreciable difference between the two in terms of audio quality.

I have macbook pro i7 2014- i tried different buffer size from 1.5 ms to 11.5 ms in rkbdj ,how i felt the diiference? Is when beat matching ,if the sound quality is not good, the characters of the song arent audible to the ears so beatmatching by ear becomes hard really felt the difference between serato and rkrb,serato sound so clear and pitch resolution is so accurate,i thing rkbdj is accurate to but sound quality is making it hard .i use ddj-sx2..and i use sennheiser headphone and bose speakers so its a good sound set up.

Absolutely no problems with sound quality. I have a MBA i5 (mid-2012) w/ 8GB and using a DDJ-SSX. I record my sets and hear no quality issues when reviewing. Latency is set to 128 samples/2.9ms. I also use serato dj and traktor and don't notice any problems. You shouldn't hear any different on your senns but if you are using bose speakers, check if it is applying some type of DSP (like my QSC K12s).

I need the pitch fader feeling as cdjs ,wat is the best buffer size i should use? Or the default buffer.?

for me it is also very bad sound rekorbox , Serato sounds infinitely better , USE UN i5 2011 macbook ram and a 16GB SSD and DDJ - sz.
USE purchased rekordboxdj