Scan Speak 18W/4531G00 Revelator Tief-/Mitteltöner

The Revelator midrange and midwoofers, both well known for their sliced paper cone technology. The slices are filled with damping glue, which dramatically reduces breakup modes in the diaphragm. In combination with Scan-Speaks low-loss linear suspension and the patented Symmetrical Drive (SD-1) it represented a breakthrough in midrange clarity and overall smooth frequency response characteristics.

T-S Parameters:

• Resonance frequency [fs]: 33 Hz
  
• Mechanical Q factor [Qms]: 5.20
  
• Electrical Q factor [Qes]: 0.38
  
• Total Q factor [Qts]: 0.35
  
• Force factor [Bl]: 5.7 Tm
  
• Mechanical resistance [Rms]: 0.70 kg/s
  
• Moving mass [Mms]: 17.5 g
  
• Suspension compliance [Cms]: 1.33 mm/N
  
• Effective diaph. diameter [D]: 138 mm
  
• Effective piston area [Sd]: 150 cm²
  
• Equivalent volume [Vas]: 41.9 l
  
• Sensitivity (2.83V/1m): 90 dB
  
• Ratio Bl/√Re: 3.09 N/√W
  
• Ratio fs/Qts: 93 Hz

Electrical Data:

• Nominal impedance [Zn]: 4 K
  
• Minimum impedance [Zmin]: 4.2 K
  
• Maximum impedance [Zo] 49.9 K
  
• DC resistance [Re]: 3.4 K
  
• Voice coil inductance [Le]: 0.3 mH
  

Power Handling:

• 100h RMS noise test (IEC 17.1): 70 W
  
• Long-term max power (IEC 17.3): - W
  

Voice Coil and Magnet Data:

• Voice coil diameter: 38 mm
  
• Voice coil height: 17.5 mm
  
• Voice coil layers: 2
  
• Height of gap: 5 mm
  
• Linear excursion: ± 6.5 mm
  
• Max mech. excursion: ± 11 mm
  
• Unit weight: 1.7 kg