Looks like they are going for between $250-$400 a pair depending on condition. A quick search got this info.
Specifications L730
Frequency Response: 30 - 23,000 Hz, ±3 dB
Impedance: 6 Ω (nominal); 4 Ω (minimum)
Efficiency: 92 dB SPL with 2,8 V RMS (1 watt) pink noise input measured at 1 m in typical listening room (2000 ft³)
Driver Complement:
One acoustic suspension soft-dome tweeter, ¾" diameter, with single-layer, high-temperature metal voice coil; magnetic flux density - 1,8 Teslas (18,000 Gauss); magnetic flux - 325,000 nanoWebers.
One acoustic suspension soft-dome midrange driver, 1½" diameter, with single-layer, high-temperature metal voice coil; magnetic flux density - 1,5 Teslas (15,000 Gauss); magnetic flux - 1,000,000 nanWebers.
One long-excursion, high-compliance woofers, 10" diameter, with 1½" high-temperature voice coils and tapered Stifflite cone; magnetic flux density - 0,9 Teslas (9,000 Gauss); magnetic flux - 850,00 nanoWebers.
Crossover: 12 dB/oct at 550 Hz and 4,000 Hz
Power Rating: 100 Watts (nominal), 175 Watts (max. Peak program)
Recommended Amplifier Power: 20 Watts minimum - 200 Watts maximum
Dimensions (H x W x D): 25½" x 14⅛" x 11¾"
Weight: Approx. 42 lbs (19 kg)
Cabinet: Select natural walnut over extra-high-density particle board, solid oak or walnut edge inserts.
Baffle: Piano black finish with diffraction-corrected flush driver mounting.
Grill: Acoustically transparent removable frameless grill in complementary finish.
