I recently came into an older pair of Heybrook HB2 loudspeakers for a
second system. These are apparently different from the current HB2, having
bextrene cone woofers. Each has one rear port and around the edge of this
port appears to be some residual foam that was apparently glued there. My
question is: Did this model in its original form have a foam plug or other
resistive loading (aperiodic) in the port? Or was this more likely a mod by
a previous owner?

Thank you in advance for any info and help.

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