Translated from the German HiFi Wiki site...
MB Quart 650 S
General:
- Manufacturer: MB Quart
- Model: Quart 650 S
- Production Year: (not shown, but the 850 S is shown as 1988-1990)
- Produced in: Germany
- Finish: Black, White, Walnut, Oak, On request, special price: Rosewood, Cherry, Pine, Wenge, Mahogany, Oak (raw), High Gloss White, High Gloss Black
- Measurements: 266 x 860 x 288 mm (W x H x D)
- Weight: 20 kg
- New Price ca.: 1.800- DM
Technical Data:
- Cabinet Type: 3-Way Closed, Tower Speaker
- Drivers:
- Woofer: MBT 205, 205 mm Paper Cone 4 ohm (95-6594)
- Midrange: MBM 50, 50 mm Supronyl Dome 8 ohm (95-6593)
- Tweeter: MCD 26, 25 mm Titanium Dome 4 ohm (95-6549)
- Loading Ability (RMS-/Peak): 100 / 120 Watt
- Sensitivity: 2,4 Watt (90 dB/1m)
- Frequency Range: 35 - 32.000 Hz
- Crossover Points: 400/2900 Hz
- Impedence: 4 Ohm
I had a pair of Quart 800's a couple of years ago, great sounding speakers. If you have any problems with the tweeters (weakest link) you can contact German Maestro that Soundmotor linked above. They can/will repair tweeters, they did mine for about €50 each, they looked and played like new afterwards.
Cheers,
James