4" Active nearfield monitor speaker.Genelec 8020APM 2-way active anthracite studio monitor - 66Hz-20kHz free field frequency response (+/-2.5dB), 105dB SPL peak per pair with music material @ 1m, 95dB SPL short term RMS @ 1m, 105mm (4") high efficiency bass driver, 19mm (3/4") metal dome tweeter wi..