Comparison of Apex Electronics 591 and Neumann U 87 Ai

Attribute	Neumann U 87 Ai ×	Apex Electronics 591 ×
Self-Noise (dB)	12	21
SPL/Self-Noise Ratio	10.58	6.76
Length (mm)	200	227
Sound Pressure Level (SPL) (dB)	127	142
Has Battery Compartment	-	-
Impedance (Ohm)	200	200
Range (Hz)	20 - 20,000	40 - 20,000
Requires Phantom Power	+	+
Pickup Pattern	Bidirectional Cardioid Omnidirectional	Cardioid
Sensitivity (mV/Pa)	28	7.9
Brand	Neumann	Apex Electronics
Name	Neumann U 87 Ai	Apex Electronics 591
Weight (g)	500	490
Max Diameter (mm)	56	33
Pads	-10dB	-10dB -20dB
Interfaces	3-pin XLR male	3-pin XLR male
Filters	HPF	-12dB/Oct @ 80Hz
Phantom Voltage (V)	48.00	48.00
Capsule Diameter (mm)	34	16
Diaphragm Diameter (mm)	26	-
Battery compartment type	-	9V