Accuton C220-11-221

8.5" (22cm) Keramik-Tieftöner, 11 Ohm

Highlights:

• 8.5 inch bass-midrange for 2 or 3-way floorstanders
• medium sized voice coil with 38mm titanium voice coil former for high midrange resolution 
• version with 11 Ohm impedance for tube amps or multiple parallel driver arrays
   

Vented box design parameters:

• Vb: 70L, Port diameter: 70mm, Length: 255mm, Fres: 23Hz, F-3dB: 30Hz, Q: 0.58 (optimal)
• Vb: 116L, Port diameter: 70mm, Length: 100mm, Fres: 25.5Hz, F-3dB: 24Hz, Q: 0.50 (extended bass)
• Vb: 58L, Port diameter: 70mm, Length: 235mm, Fres: 26Hz, F-3dB: 31Hz, Q: 0.61 (0.7dB Ripple @ 50Hz)

Closed Box design parameters:

• Vb: 39L, -4dB @ 40Hz, -18dB @ 20Hz, F-3dB: 43Hz, Q: 0.71 (typical)
• Vb: 116L, -4dB @ 40Hz, -11dB @ 20Hz, F-3dB: 45Hz, Q: 0.50 (extended bass)

Mechanical Data:

• Overall diameter/square: 220 mm
  
• Cutout diameter/square: 190,5 mm
  
• Frontplate depth: 9 mm
  
• Overall depth: 105 mm
  
• Motor assembly depth: 42 mm
  
• Motor assembly diameter: 120 mm
  
• Screw fitting:  DIN 7984, 4 mm
  
• Terminal: + : 6.3 x 0.8 / - : 4.8 x 0.8
• Shipping weight /net weight (one piece): 2,4 / 2,1 kg
  
• Shipping box size (pair): 250 / 145 / 250 mm

Thiele / Small Parameter:

• Sensitivity Lp (2.83V / 1m): 88 dB
• DC-resistance Re: 10,9 Ohm
  
• Resonance frequency Fs: 25,2 Hz
  
• Equivalent volume of air Vas: 95 L
  
• Mechanical Q Qms: 6,74
  
• Electrical Q Qes: 0,43
  
• Total Q Qts: 0,40
  
• Effective piston area Sd: 227 cm²
  
• Moving mass Mms: 30,6 g
  
• Suspension compliance Cms: 1,3 mm/N
  
• Mechanical resistance Rms: 0,72 kg * s

Voice Coil Data:

• Power handling P: 150 Watt
  
• Linear excursion xmax: +/- 5 mm
  
• Voice coil diameter: 38 mm
  
• Voice coil former material: Ti
  
• Voice coil material: Cu
  
• Voice coil inductance Le: 1,2 mH
  
• Force factor Bl: 11,1
  
• Motor type: Overhung