Please don’t assume. It’s easy to look up these products online. The MiniDSP SHD Studio does not have a DAC built in.the yamaha streamer has a dac and is a preamplifier. The okto8 is a dac/digital preamp. Minidsp I am not familiar with the 'studio' designation, but if it is similiar to the other products it has DAC and preamp function.
Why do we need to continue to pile on? What has @waynel done to deserve your ire?