Teflon takes 200+ hours to stabilize as a rule. Place the speakers close together, face to face, and reverse the polarity on one of them. Play music(like from an FM tuner), set on mono, with heavy bass content. That will lower the output volume and take some of the pain out of the burn-in period. The 8TC is capable of better bass transmission than the 4TC, and with time it will become more defined, as will the upper octaves. Be patient.
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