Rational Acoustics RTA-420

Rational Acoustics RTA-420 with calibration file

The NEW Rational Acoustics branded RTA-420 is a 1/4 inch back electret condenser microphone ideal for measurement systems on a budget. Whether you’re a student or just starting out in the business, or an established pro looking for a backup mic for your kit, putting together a “B” rig or you want to be able to put up multiple mic’s in large venues without taking out a second mortgage, the RTA-420 offers very respectable frequency response and solid, road-worthy construction at an exceptionally affordable price.

Please Note: The RTA-420 may be powered by 9 to 52 V phantom supplies, and like it’s predecessor it is PIN 3 HOT.

Key Features:
Element : 1/4″ Back Electret Condenser
Polar Pattern : Omnidirectional
Frequency Range: 20 Hz ~ 20,000Hz
Nominal Sensitivity: 7 mV / Pa, ±3 dB
Impedance : 250 Ω ± 30% (@ 1KHz)
Operating Voltage : 9 – 52V DC Phantom Power
Sensitivity : -63 dB ± 3 dB ( 0 dB=1V/ microbar 1,000 Hz indicated by open circuit )
Housing diameter at capsule : 10 mm (approx. 3/8″)
Length : 145 mm


IMPORTANT! This mic is wired from the factory as PIN 3 hot. Your phase trace will be 180 degrees out when using this mic so keep that in mind. Because the mic comes with a calibration file, you can load the file directly into SMAART 7 or SMAART 7 DI and have a ruler flat measurement rig without spending a bunch of money. If you buy one of these, spend the extra money to get the calibration file. It’s worth it.