The BM15A is notable for delivering genuinely full-range, high-output monitoring from a compact active cabinet. At EUR 1,150, the price is fair if this is for a pair, though not an obvious bargain: recent used examples cluster around EUR 880–1,100 per speaker, while pairs have appeared around EUR 1,500–1,650. If EUR 1,150 is for one cabinet, it is expensive unless condition and provenance are exceptional.
These remain highly regarded for their superb stereo imaging, clean detail, substantial bass extension to roughly 40 Hz, and serious headroom from the built-in 200-watt bass and 100-watt tweeter amplifiers. They can work convincingly without a sub and suit both critical music listening and studio use. Confirm whether the listing includes both left and right speakers, test both amplifiers and drivers at useful volume, and check that the XLR inputs and rear controls are clean; otherwise, a complete, healthy pair would be a worthwhile buy.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.