Apex 220 :
Type Back Electret Condenser
Operating Voltage (V) 15V ~ 48V DC
Output Impedance (Ohms) Less than 250 Ohms +/- 30%
Frequency Range (Hz) 20Hz - 20kHz
Pollar Patterns (s) Omnidirectional
Sensitivity (dB) -63dB +/- 3dB (0dB=1Vmicrobar 1000Hz)
Equivalent Noise Level (dB) (IEC 268 - 4 - A weighted) 24dB
S/N Ration (dB) Over 67dB
Maximum Input SPL (dB) 105dB (For 1% THD @ 1kHz)
Weight (oz/g) 3.7 oz / 105g
Dimensions (in/mm) 5 3/4” x 3/8” (14.6 mm x 1cm)
TR40;
Specifications
Transducer Principle Pre-polarized condenser
Pickup Pattern Omnidirectional
Frequency Range 20 Hz - 20 kHz
Impedance 200 ohms
Maximum SPL >140 dB
Housing/Finish Machined aluminum
Weight 5 oz
ECM 8000 ??