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Mbl 121
wholesaler	MBL SPAIN
contact person	MBL Spain
phone	902875901
email	contact by email

(Automatically translated from Spanish)

mbl's revolutionary "Radialstrahler" system allows our new mbl 121 monitor to conjure up a three-dimensional sound field in your listening space, just like that found in a music venue. The "Radialstrahler" concept is, in theory, simple, yet ingenious: musical instruments and voices emit sound waves in all directions – so we created a loudspeaker that radiates in all directions, not just to the front or rear, like more common designs.
The critical tweeter and midrange drivers of the mbl 121 share technology with our legendary mbl 101 and mbl 111 loudspeakers, which utilize a patented arrangement of hand-made curved stripes, or "petals," fixed vertically around an axis. A voice coil at the base and a counter bearing on the top keep the petals under tension upward and downward. When a musical impulse is transmitted from the amplifier to the speakers, the petals bend in proportion to the current and emit sound waves (this principle is also called "Bending Pulsar Driver," or B-Pulsar). The result is an outstanding three-dimensional and natural sound field, which in any direction remains undistorted, neutral, and homogenous – just like the live musical event.

In order keep the signal natural and musical, the numerous petals in the tweeter and midrange drivers are meticulously crafted of proprietary hand-made carbon-fiber materials; in the case of the tweeter, the petals are drawn from uni-directional carbon-fiber and in the midrange, they are drawn from cross-woven carbon fiber, all of which are compressed under high pressure and shape-hardened at an exact temperature. Successful installation of these ultra-thin (120 mm) petals demands absolute precision.

An important design goal in the mbl 121 was to provide all of the beauty, magic, and sheer realism of it's larger siblings, while keeping the cabinet footprint compact and elegant. To achieve this goal, the mbl 121 utilizes several unique low-frequency implementations:

1. Passive Bass Crossover Network
The mbl 121 uses a passive low-frequency crossover in order to provide:

a: Increased bass output
Typically, a compact cabinet results in reduced bass output. The passive matched crossover in the mbl 121 essentially doubles the effectiveness of the cabinet volume, which increases the overall low-frequency output. This crossover design allows the impedance reserve of the woofers to work in a push-push series connection.

b: Suppression of subsonic information
Below the tuning frequency of a vented box design, the excursion of the bass driver could take extreme dimensions, which easily could destroy it mechanically and distort its output. The mbl 121 uses a passive subsonic filter to eliminate any possibility of the lowest frequencies interfering with the driver operation, thus reducing unwanted (un-musical) distortions.

2. Psycho-Acoustically Aligned Energy Response

The mbl 121 applies Psycho-acoustic principles to the woofers with counter compensation. This is achieved by:
a: Increasing the bass group delay time
By increasing the slew rate in the bass range of the mbl 121, the group delay time is increased, resulting in extended bass impulses. This allows low-frequency information to be perceived more fully and clearly.

b: Incline of the energy curve
We calculated the gradient of the acoustic energy in the mbl 121 so that it declines with 3 dB over 2 decades towards the higher frequencies. The result is an acoustic increase, which makes the relatively-compact enclosure sound acoustically larger.

Special Features Found in the mbl 121's Bass/ Lower-Midrange Drivers:

- Bass/ lower-midrange drivers in the mbl 121 are aligned in a push-push configuration, resulting in mutual power compensation; therefore, the cabinet is not stimulated mechanically to resonate.

- Bass/ lower-midrange drivers in the mbl 121 utilize high temperature-tolerant aluminum voice coil carriers and aluminum membranes, which yield high load capacity, since the heat of the voice coil is led away to the membrane via the voice coil carrier.

- Bass/ lower-midrange drivers in the mbl 121 utilize aluminum membranes with flanged edges which provide an absolutely deformation-free membrane surface resulting in zero-loss transmission of the mechanical movement of acoustic sound pressure.

- Finish: black, silver, veneer (Satin / Piano)
- Dimensions (W x D x H): 280 x 350 x 430 mm (H = 570mm with grille).
11 x 13.5 x 17.5 inches (H = 23 inches with grille).
- Weight: 20 kg, 44 lbs. each

Guarantee of ten years for parts, labour and installation.

Price: 12.300 € EUR

Brand: MBL

Related products:

1. Mbl 101 e
2. Mbl 9011
3. Mbl 1611
4. Mbl 1621

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