The AKG D-900E is a professional, ultradirectional microphone At up to three or four times the “normal” working distance of a cardioid, the D-900E is still capable of yielding required output level, high-quality speech reproduction, and excellent
rejection of ambient noise or acoustic feedback. The D-900E achieves its relatively high output and extremely tight directional pattern by employing a sensitive pressuregradient dynamic transducer, a front- and side-ported housing,
and an acoustic-interference tube over 19 inches in length Through careful integration of these three design elements, the D-900E maintains useable directionality throughout its entire frequency range – including the critical lower frequencies.


A built-in three-position bass-rolloff switch and inductive resistive
network provide an additional 7 dB or 20 dB attenuation 50 Hz