BM Line15(ver2017)

BMLine 15(ver2017)

The BMLine 15(ver2017) with virtual coax and wave guide.

  • Overview
  • Technical Data
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The BMLine 15(ver2017) is a complete redesign of the very successful and renowned BMLine 15. This included a complete revision and optimization of all parts responsible for the reproduction. So for example, three chassis are now in operation replacing two for the bass reproduction, the amplifier power has been increased and with the introduction of the DMC2.0 membrane control, the performance has been considerably increased. The mid-range is reproduced with a B&M proprietary special chassis with an inverted calotte and the range extended downwards by approx. 200 Hz. The mid-/high range unit now converts all frequencies above the bass range up to the highest tones in a single, compact unit with a smooth, directional radiation characteristic. The textile tweeter’s calotte now has a larger diameter and plays extremely homogenous and distortion-free. The construction as DvX™ ("Directed Virtual Coax") permits listening in the near field as well as at larger distances.

DvX™-Technology:


The concept of directed virtual coax is implemented with two mid-range speakers whose transmission band has been chosen in order for both membranes of the mid-range speakers to physically work as if they were one combined cone. The positioning of the high-range toner exactly in the middle of this virtual membrane area creates a coaxial loudspeaker that by definition doesn’t permit the creation of time differences during changes of the listening position in the near field. In combination with the waveguide, a directed coax with directional radiation reduces the reflections from the side walls of the listening room.

The DMC2.0™-Technology from B&M:


The loudspeaker chassis is, if you look at this technically, a special linear motor. As with all linear motors one can measure the distance, speed and acceleration. As the membrane’s speed and direction change with the rhythm of the music, its position is being continuously recorded with a sensor implanted in the controlled chassis. These values are then fed into an analogue controller where they are compared instantly with the current musical signal feed. Only the differences are then fed back to the amplifier for correction. This guarantees that at any moment in time, the membrane only makes the required movement in order to exactly reproduce the music signal. Delayed oscillations and similar blemishes are thereby made impossible. Since sound moves with 330m/sec, the electronic correction however with almost light speed, the errors can be corrected still during their formation. This simple principle means that the implementation requires the most fine craftsmanship with sensors, knowledge of theoretical relationships, experience and instinct. The reward for this effort is a neutral, unfalsified musical reproduction, with a linear amplitude and phase frequency response down to the lowest cut-off frequency without latency periods.

 

Front Side 3 x 8"-Carbon-bassdrivers with B&M-DMC2.0
Front Side 2 x 5"- B&M-midrange with Invers calotte
Front Side 1 x 1,2"-silkdome
Amplifier Power sub 500 / mide 180 / high 120 W
Frequency Range 25 - 22000 Hz (+/- 3 dB), X-Over: 200 Hz, 1500 Hz
Input Sensitivity bis 10 dBu
AD-Converter 24 Bit Sigma Delta AD-Converter up to 192 KHz
DA-Converter 24 Bit Sigma Delta DA-
Analog IN, OUT XLR-symmetrisch
Digital IN XLR-AES3-
DSP FPGA (software-based DSP)
Room adaption room adjustment by 6 Filter, Distance Shift, Subwoofermode
Optional B&M PPG for 6 parm.EQs
Dimension

Weight
H x W x D
134 x 34 x 42 cm
51 Kg