dc655321
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https://www.diyaudio.com/forums/multi-way/76977-arta-60.html#post5492173
" I've tested latency variations with Umik-1 and external sound card (but not with ARTA). Conclusion was that severe timing/phase differences exist between different measurements. Timing may stay quite stable few measurements but then delay might jump ~0.5...>1 ms back and forth. Rebooting or starting another program between measurements was not needed to generate delay jumps, and latency adjustment of sound card did not help.
So, it is not valid gear for advanced speaker measurement needed to simulate multi-way to off-axis, power, DI responses etc. because that requires very stable timing i.e. semi-dual (or dual) channel connection and measurement mode selected in ARTA (or REW). "
https://www.diyaudio.com/forums/multi-way/76977-arta-60.html#post5492272
"Single channel gear such as simple USB mics are very common today. They have spread from room acoustics measurements to speaker design which is unfortunate because more and more new users end up to bad, inaccurate/random and very slow design methods. This is not my fight, so I simply recommend to ignore messages and authors supporting or advertising such gear from now on. "
REW has given possibility for 2-ch measurements only for some time, after kimmosto got John to understand this. REW is primarily a room measurement/analysis program, impedance meas and 2-ch are extra add-on features .
Please don't take this the wrong way, but can you show or point at some data/evidence indicating a problem measuring timing/phase with current versions of REW+UMIK-1?