Audioengine 2 (A2)

Fig.5 Audioengine2, anechoic response on tweeter axis at 50", averaged across 30° horizontal window and corrected for microphone response, with the nearfield responses of the port (red) and woofer (blue) plotted below 700 and 300Hz, respectively, and the complex sum of the nearfield responses plotted below 300Hz (black).

Fig.6 Audioengine2, lateral response family at 50", normalized to response on tweeter axis, from back to front: differences in response 90–5° off axis, reference response, differences in response 5–90° off axis.

These loudspeakers are very cute, but have well balanced response and relatively deep bass extension considering its driver unit size. But be careful that such bass extension is due to strong electronic amplification (see below).

Fig.2 Audioengine2, built-in amplifier frequency response at 1V into 8 ohms, measured at right-channel speaker output jacks (2dB/vertical div.)

Source: http://www.stereophile.com/content/audioengine-2-powered-loudspeaker-measurements