If it's in the bottom frequencies domain, it's nothing to worry, In the midrange it may be audible. Check your speaker frequency/impedance map.
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By bench test do you mean a test performed by a magazine? Audio Research has a much better facility than any magazine could ever dream of having and more intelligent people performing the tests. Why not contact Audio Research?
Also, your Thiel 2.4s have a minimum impedance of 3ohms not 2ohms and below.