I have a single Eminence 18" cast frame woofer that is similar to the Eminence Sigma Pro series. This was a sample that was made to custom specs for a certain speaker company which I cannot name. Fs is around 25hz. I had it mounted in the wall(infinite baffle) and it produced bass down to 20hz with incredible ease.
The front of the driver is like new. The back of the magnet has some scratches on it from being mounted in various cabinets.
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