4000 Series 6.5″ Mid Woofer – MW643

Audio Dynamics speakers were designed to reproduce music with ultimate accuracy.

We’ve spent countless listening hours examining the tonal qualities of many different cone materials; from glass fiber, to Kevlar, to carbon fiber and more. Ultimately, we chose wool pulp for its ability to deliver astonishing realism and detailed timbre across the harmonics. We then added an acoustically-transparent chemical to help the soft parts resist moisture.

Our speakers will pull you into the musical performance and breath new life into your music collection.

Fs	55.450 Hz
Qms	2.579
Vas	12.880 l
Cms	0.506 mm/N
Mms	16.080 g
Rms	2.195 kg/s
Dia	130.500 mm
Sd	133.755 cm²
	
Qes	0.480
Re	3.836 Ω
Le	0.165 mH
Z	4.603 Ω
Bl	6.687 Tm
Bl²/Re	11.659 N²/W

Qts	0.405
no	0.440 %
SPL	88.587 dB

Frame Outer Diameter	6.53in (166mm)
Grille Outer Diameter	7.16in (182mm)
Motor Outer Diameter	3.93in (100mm)
Grille Protrusion	0.90in (23mm)
Mounting Hole Diameter	5.59in (142mm)
Mounting Depth		2.67in (68mm)