***Anyone that knows anything about trial design, knows that correctly designed and implemented DBTs are virtually impossible when comparing electronics. An incorrect or flawed DBT may introduce errors which can make the results of the DBT neither reliable nor valid. ***


Really..... see my post above. How hard could doing a single blind comparason without you knowing the identies of the units be? The volume difference issue could be easily solved by having the assistant reducing the volume to zero on each unit as it is put into the system, and you adjust it to taste from there. Personally, I wouldn't take the time to do such a comparason, since, being the outcast that I am, believe that the sound difference in most electronics is swamped by the differences in program material / how your hearing is on a particular day / if you just had an argument with the significant other / relative humidity / sound absorbtion from more people in the room etc.