do i need a master clock?

[DAW PLUS]

If your AD/DA are separate from your audio interface, and you are routing the comp signal from the same software & audio interface which also gets it returned, then yes.
Rule of thumb: every digitally connected device (using ADAT, s/pdif, AES/EBU, MADI, TDIF, SDIF, etc.) needs clocking. Only one can be master, the rest is always a slave. If digital devices are connected analog (like synths, reverbs etc), they do not require clocking.
If devices are connected digitally, they can be clocked by using the digital input as a clock source. In larger setups (4 devices or more), it is wise to use word clock.

[firubbi]

Thanks. My plan is to get a burl b2 dac. So my setup will be something like this:
Daw sonar>sonic core pulsar sound card adat/spdif>burl b2 dac> MBP > apogee mini me AD> back to sound card adat\spdif in> same Daw. Or to a separate sound card so that i can avoid clocks. Thanks

[DAW PLUS]

Originally Posted by firubbi

MBP > apogee mini me AD> back to sound card adat\spdif in> same Daw.

So you ue the MBP as an FX processor? To save CPU on the Sonar workstation?
You might benefit from Vienna Ensamble Pro, which uses ethernet and hosts any plugin. No conversion involved.
Also, MBP>MiniMe tells me you use the analog out of the MBP, which is the weakest conversion of all. Rather use the digital out of the MBP straight into the Pulsar, if possible.

[firubbi]

no.. pure mix. all tracks to 2bus(instant using a summing i want to try Master buss processor) and back to daw. so i guess as you said there is 2 individual converter is there so i need a master clock as master and rest is salve.