Join Date: Mar 2010
Location: Scottsdale, Arizona
Mentioned: 3 Post(s)
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Regarding foam surrounds I think speakers with foam surrounds > 20 yrs old are at risk.
In any case, whether present at purchase or not, this would happen eventually. I can't speak to whether any 901s don't have them. In any event, I replaced the foam surrounds in 1993 Advent Legacy III speakers using a DIY kit and this was not super difficult with a bit of patience.
Living room: Samsung PN60F8500, Sony X800M2, Roku Premiere+, Revel W763, Revel M16, Hsu HB-1 MK2, RSL C34E, Rhythmik D15SE, Denon X4200W; Zone 2: Speaker selector, Yamaha RX-V495 (1999); Bedroom: Panasonic P50U54, Oppo BDP-80, Chromecast Audio, Advent Legacy III (1994), Denon 2310ci; Cabin: Roku 3, NHT Super Zero (1996), Hsu VTF-2 MK4, Denon 1712