I think you should ask EAR, wouldn't they be able to offer the most definitive answer?
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Changing the value of the coupling caps can be critical and dependent on the locations of the coupling cap in the circuit. For example, doubling the value of the cap, in some applications, could destabilize very low frequencies and cause a rise in low frequency response instead of a gradual roll off. Since going from .15 to .1 would be decreasing the value of the cap, this should not cause a problem and in fact may potentially fall within the tolerance of the cap. The end result might be a -3dB of say 10Hz instead of 5Hz. You may find that audible. Hard to say.