Manual Info Sheet Brochure Little Diamond. 805 D4 might be smaller than its floorstanding siblings, but it's no lightweight: its beautifully ... Continuum cone bass midrange. Frequency range 34Hz to 35kHz. Frequency response 42Hz to 28kHz (+/3dB from reference axis) Sensitivity 88dB (on axis at at 1m) Harmonic distortion 2nd and 3rd harmonics (90dB,1m on axis) .