MB12.1 is designed so that an adequate splay angle between the adjacent cabinets is needed to minimize interference and have smooth response. This example should be considered as a starting point for cluster setup and tuning.
Calculated Specs for cluster 2 (Vertical) x 2 (Horizontal) MB12.1
Splay angle between the axis of the cabinets
Specs are calculated for a single cluster, mono. For stereo configuration, at least at Low Frequency, +3dB Maximum SPL could be considered.
Usable throw is defined as distance for good intelligibility, which significantly involves mid-high frequencies reproduction.
Sample clusters consisting of 2 raws are configured in the way that upper loudspeaker (LF) is close to lower horn (HF). When configuring upper horn close to lower horn (upper system upside-down) the effect is that longer throw for mid-high frequency range is achieved and also speech intelligibility is improved. This is a consequence of improved constructive interaction (less destructive) between emissions from the two horns, since the two sources are closer to each other, and the two acoustic paths of sound waves from the sources to the listener are more similar.
On the other hand the constructive interaction at low frequencies between the two systems is just slighlty reduced. In fact low frequency transducers are further from each other. However, due to large wavelenghts in their emission range, the increased difference of waves paths has less significant consequences.
(1) Frequency Response (± 3dB) measured on-axis in half-space loading condition, 1/36 octave frequency resolution. Half space condition occurs when floor, rear or side walls are close to loudspeaker, and affect low frequencies loading.
(2) Range limits stated at - 6dB.
(3) Maximum Full Range SPL measured in half-spece loading condition, referred to 1m measurement distance, with pink noise (6dB crest factor).
(4) - 6dB points.
In keeping with a policy of continued improvement, MB reserves the right to alter specifications without further notice. Rights for names and trade-marks quoted in this document belong to respective owners.