I have 6 of these that I bought, um, 20 years ago 🙂 for a home theatre setup. I was recently googling them, which resulted only in a bunch of people looking for their specification because they were used in the Martin Logan SL3. They're a compound-paper-cone 10" woofer which work well in a sealed box but are lacking in sensitivity and (by modern standards) Xmax.
For the purposes of posterity and future googlers looking to repair an SL3, this is the Thiele-Small specification that I copied from the datasheet when I bought mine:
Vifa M260WO-06-08
Fs = 23.3 Hz
Qms = 2.63
Vas = 150L
Cms = 0.893 mm/N
Mms = 52.28g
Rms = 2.91kg/s
Xmax = 6.5mm
Diam = 209.3mm
Sd = 344 sq.cm
Qes = 0.62
Re = 5.84 ohms
Znom = 8 ohms
BL = 8.5 T.m
Pe = 130W
Qts = 0.5
eff = 0.209%
SPL = 85.4 dB@1W
I have not confirmed these numbers with measurement; doing so now with my now new-old-stock drivers may well be misleading for people who are looking for a new driver to match what these things were when new. Hope that helps someone out there...
For the purposes of posterity and future googlers looking to repair an SL3, this is the Thiele-Small specification that I copied from the datasheet when I bought mine:
Vifa M260WO-06-08
Fs = 23.3 Hz
Qms = 2.63
Vas = 150L
Cms = 0.893 mm/N
Mms = 52.28g
Rms = 2.91kg/s
Xmax = 6.5mm
Diam = 209.3mm
Sd = 344 sq.cm
Qes = 0.62
Re = 5.84 ohms
Znom = 8 ohms
BL = 8.5 T.m
Pe = 130W
Qts = 0.5
eff = 0.209%
SPL = 85.4 dB@1W
I have not confirmed these numbers with measurement; doing so now with my now new-old-stock drivers may well be misleading for people who are looking for a new driver to match what these things were when new. Hope that helps someone out there...
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