would I see a major improvement on this upgrade. I'm running PSB image t45 and b15 speakers along with Dual subs( PSA XS30's)..... nothing wrong with the Pio except MCACC can be frustrating at times-.
Improvement, yes .... can't say how much though, especially as not only can the X4000 EQ the sub, but using Sub EQ HT it can also set the level/delay of each sub independently.
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