Vandersteen 3A Signatures with 2 dB difference between L and R Speakers

I just purchased a set of 3A Signatures CPO from a dealer, and was running a frequency sweep using a calibrated mic and it shows a 1.9 dB difference in volume between the L and R speakers.  Is this within the margin of being acceptable?  I thought these speakers came in matched pairs, do they not?

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Make sure the adjustments for tweeter and midrange on the rear panel are set the same.  (Sorry if that seems obvious ...)
swap speaker wire L to R , see IF problem changes. Speaker located same place ?Vandy open, call.
locate speakers side by side middle of room, test. Who is the CPO dealer ? have you reached out to them ? 
best to you
i had 3a Sig for many happy years