Passive Microphone 
Based on the character of the legendary R44, the AEA R84 Ribbon Microphone provides classic tonality with extended top-end and reduced proximity effect for medium and close range recording. 
 
In 2000, AEA sought to design a more compact, lighter and less expensive version of the hefty, eight-pound RCA 44BX. The result was the R84, which includes the best of the 44 series in a lower cost, three-pound package. 
 
The R84 and original RCA 44 (now the R44C) share the same Big Ribbon element, transformer and other elements in the design. By using modern design techniques and stronger — but smaller — magnets in the R84, the classic RCA ribbon sound is retained. 
 
However, the R84 has improvements — including less proximity effect, better top end, vibration isolation and greater placement flexibility on tight stages and in studios. The mic’s U-shaped yoke acts as a shock mount and also enables the user to position the R84 at numerous angles even with a straight stand. 
 
Product Features/Specifications: 
Warm, smooth and detailed classic ribbon sound 
Full and rich tonality with generous highs and lows 
Voiced like the legendary R44 Series but with less proximity effect 
Versatile for both close and ambient applications 
Made in the U.S.A. 
Technical Specifications:  
Link  
https://www.aearibbonmics.com/wp-content/uploads/2018/01/AEA-R84-Series-Specifications-2-3-18.pdf  
Operating Principle: Pressure gradient transducer 
Directional Pattern: Bidirectional 
Frequency Range: <20 Hz to >20 kHz 
Polarity: Pin 2 high for positive pressure on front of microphone 
Polar Response: Native bidirectional, figure-of-8 pattern 
Horizontal: Up to 90 dB rejection at right angles to the front/back axis. 
Vertical: Level changes with angle of incidence, but frequency response is consistent. 
Transducer Element Material: Pure aluminum corrugated ribbon 
Thickness: 1.8 µm 
Width: 0.185 in (4.7 mm) 
Length: 2.35 in (59.7 mm) 
Microphone Dimensions 
Height: 11.6 in (29.5 cm) 
Width: 3.9 in (9.9 cm) 
Depth: 2.5 in (6.4 cm) 
Weight with cable: 3 lb (1.36 kg) 
Shipping Weight: 4 lb (1.8 kg) 
Connector: XLR-3M  
Maximum SPL: 165 + dB SPL (1% third harmonic > 1 kHz) 
Sensitivity: 2.5 mV/Pa (-52 dBv/Pa) into unloaded circuit 
Output Impedance: 270 Ω nominal 
Recommended Load Impedance: 1.2K Ω or greater 
Phantom Power: Not required or recommended 
Accessories Included: 
Softcase, user manual, captive 10” (3 meter) output cable with XLR-3M 
connector. 
Note: The phantom-powered R84A was previously known as the A840