The AKG's D7S reference dynamic vocal microphone combines a condenser capsule's delicate and open sound with a dynamic microphone's tremendous resonance. The revolutionary dual-layer Varimotion diaphragm can vibrate freely, resulting in a sound that is very sharp and pure. The D7's remarkable high gain before feedback is due to the unique laminated material's ability to dampen strong resonance peaks in the frequency response, which, when combined with the tight, supercardioid polar pattern, allows for the D7's outstanding high gain before feedback.