The large active range from PMC justly deserves the label of 'no compromise'. Sold in Pair.
Every element has been designed and manufactured purely for its performance and encompasses the smallest detail from individual cable choice through to hand selection of capacitors in the active crossover networks. This level of resolution cannot be achieved with standard technology and average tolerances.
For small to medium size recording, mixing or mastering rooms, MB2-A would be appropriate, with the XBD added for additional low frequency SPL.