MB Quart Reference

Data

General

• Manufacturer: MB Quart
• Model: Reference MK I / MK II
• Year of manufacture: around 1985-1988
• Manufactured in: Obrigheim / Germany
• Colours: black, white, natural mahogany veneer
• Dimensions: 1870 x 530 x 530 (MK I?)/ 1880 x 530 x 570 (MK II?) mm (HxWxD), gross volume 525 liters
• Weight: approx. 147 kg
• New price approx.: 20.000,00 DM (1985) - 29.000,00 DM (1987)

Technical data

• Type: 4-way floorstanding loudspeaker, active, closed
• Chassis:
  • woofer: 1x 380 mm (MBT 380 cone, net volume 328 liters).

Bass-midrange driver: 1x 205 mm (MBT 205 cone, net volume 24 litres)

• • midrange driver: 1x 50 mm (MCD 51 dome tweeter)
  • tweeter: 1x 25 mm (MCD 26 titanium dome)
• Frequency response: 16 - 32,000 Hz
• crossover frequency: 220 / 900 / 4,500 Hz Linkwitz filter 24 dB/octave
• Impedance: 4 Ohm

• Total power: 150 / 150 / 70 / 70 W (TT / TMT / MT / HT)

• Amplifier: 420 W total power, 2x 140 Watt bipolar bass amplifier, 2x 47.000 µF/network wire
• Input sensitivity: 1 mV / 10 kOhm
• Distortion factor: TTL/MTL: 0.003 %; MTL/MTL: 0.03 %
• Signal-to-noise ratio: 103 dB (bass), 99 dB (MT,HT)

Special Features

• Reference:

 In the development of our Quart Reference, we have spared no effort or expense in order to achieve an optimal sound experience
 achieve. First, all speaker drivers were perfected. The MBT380 woofer was given a special centring 
 centring and a particularly stiff diaphragm. Even extreme low bass impulses are still transmitted cleanly, wobbling of the cone is 
 diaphragm is practically ruled out.
 The MCD26 tweeter has been fitted with an elaborately designed magnet system that eliminates resonance in the transmission range. 
 in the transmission range. The baskets for the woofers and the common mounting flange for the midrange and tweeter are all made by hand in a sand casting process. 
 by hand using a sand-casting process that suppresses virtually all chassis resonance. The next step was to optimise the 
 optimised. 38mm thick outer walls, internal stiffeners with a special sound guide as well as damping with 
 mineral fibre panels guarantee the resonance-free design of the cabinet. The last step was the development of the active electronics unit.
 unit. Separate power supplies for bass and MT/HT amplifiers ensure high crosstalk attenuation, the bipolar bass amplifier 
 with its high damping factor (200) always keeps the heavy bass diaphragm precisely under control, MT/HT amplifiers in MOS-technology 
 show excellent high frequency behaviour.

Remarks

• MK II uses entire volume for bass, revised electronics
• One power supply for TT/TMT, one power supply for MT/HT

• Rating Stereoplay 6/85

 Sound: very good
 Measurements: good to very good
 Manufacturing quality: very good
 Price/performance ratio: good to very good
 Quality level: Absolute top class'
 Rating: stereoplay Reference

Price-related ratings of the HIFI VISION 8/85

 Sound: very good
 Workmanship: very good
 HIFI VISION - Verdict: very good
 Absolute rating: Top class place 1

Price-related ratings of the HIFI VISION 12/86

 Sound: very good
 Workmanship: very good
 HIFI VISION - Verdict
 Price-related overall rating: very good
 Absolute rating: reference class