I have a PF1800 (that is sealed) and it is far to slow to keep up with any high end speaker (which is why I mainly use a pair of JL Audio F113's which EASILY can keep up and blend nicely).
I remember the slotted port being on the back at the bottom. There are Internet pics showing this but apparently photos can be altered. The it's sealed' folks must be correct. Having owned one doesn't seem to matter.
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