ADCS642 – 4000 Series


  • Perfectly blended wool pulp cone midrange for realistic tonal accuracy
  • 1.375 in (34.9 mm) Voice Coil Midrange
  • 6 ½ in (165.1 mm) Cast Frame Midrange
  • Push pin terminals on midrange
  • 1.125 in (28 mm) High-end German silk dome tweeter
  • Aluminum tweeter casing
  • Thread lock flush mount system
  • Aluminum triple angle surface mount cup (TWCUP sold separately)
  • Polypropylene capacitor in tweeter circuit
  • Air core inductors in tweeter and woofer circuits
  • Optimal bandwidth:  60Hz – 20kHz
  • 150 Watts RMS power handling*

* All power ratings are figured using an electronic high pass crossover with a minimum crossover point of 60Hz at 24dB/Octave, 80Hz at 18dB/Octave, or 100Hz at 12dB/Octave.

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SKU: ADCS642 Category:


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. We’ve gone to similar lengths in developing our tweeter components which use the highest grade German silk domes and powerful Neodymium motors to produce clear and effortless highs.

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


Fs	74.020 Hz
Qms	3.637
Vas	7.997 l
Cms	0.304 mm/N
Mms	15.210 g
Rms	1.945 kg/s
Dia	132.000 mm
Sd	136.848 cm²
Qes	0.510
Re	3.623 Ω
Le	0.282 mH
Z	4.378 Ω
Bl	7.092 Tm
Bl²/Re	13.884 N²/W

Qts	0.447
no	0.614 %
SPL	90.027 dB

Frame Outer Diameter	6.49in (164.91mm)
Grille Outer Diameter	7.18in (182.23mm)
Motor Outer Diameter	3.92in (99.52mm)
Tweeter Protrusion	NA
Grille Protrusion	0.89in (22.47mm)
Mounting Hole Diameter	5.70in (144.94mm)
Mounting Depth		3.0in (76.15mm)