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Audio Dynamics speakers were designed to reproduce music with ultimate accuracy. Audio Dynamics has spent countless hours testing different cone materials that could stay rigid during extreme excursion while allowing the speaker to maintain efficiency and incredible sound quality. Ultimately, they chose a cotton cloth and glass fiber composite honeycomb cone. They also incorporated a new S roll surround, shorting ring, and 35mm voice coil. This speaker handles extreme power and delivers the most dynamic and effortless mid-bass of any driver ever produced by Audio Dynamics.
 
Specifications:
Cotton cloth and glass fiber composite honeycomb cone
6 ½” (166 mm) Cast frame mid/woofer
Rubber S roll surround for extreme excursion capability
1 3/8″ (35 mm) voice coil
Large gauge push pin terminals
Shorting ring for extended response
250 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.
 
Midbass Dimensions:
Frame Outer Diameter 6 1/2" (166mm)
Grille Outer Diameter 7 3/16" (182mm)
Motor Outer Diameter 3 15/16" (100mm)
Grille Protrusion 15/16" (23mm)
Mounting Hole Diameter 5 5/8" (142mm)
Mounting Depth 2 7/8" (73mm)
 
Midbass T/S Parameters:
Fs 63.420 Hz
Qms 2.530
Vas 10.760 l
Cms 0.453 mm/N
Mms 13.740 g
Rms 2.188 kg/s
Dia 128.300 mm
Sd 129.284 cm²
Qes 0.520
Re 3.376 Ω
Le 0.127 mH
Z 4.051 Ω
Bl 5.962 Tm
Bl²/Re 10.529 N²/W
Qts 0.431
no 0.509 %
SPL 89.214 dB