Comparison Table for Primo Microphone Capsules

MODEL	Directionality(Polar Pattern)	SENSITIVITY0dB=1V/PA	Self Noise	Signal to Noise Ratio	MAXIMUMSPL	Connection	DIA.(mm)	HT.(mm)
EM172	Omni	-28 dB	14 dB	80 dB	119 dB	2-wire	10.0	4.5
EM272-Z1	Omni	-28 dB	14 dB	80 dB	122 dB	2-wire	10.0	4.5
EM173	Omni	-37 dB	14 dB	80 dB	135 dB	3-wire	10.0	4.5
EM273	Omni	-37 dB	14 dB	80 dB	135 dB	3-wire	10.0	4.5
EM258	Omni	-32 dB	20 dB	74 dB	115 dB	2-wire	5.8	2.0
EM288Z1	Omni	-43 dB	24 dB	70 dB	127 dB	2-wire	4.0	2.0
EM23	Omni	-40 dB		>70 dB			21.0	13.5
EM182	Cardioid	-41 dB	16 dB	78 dB	136 dB	3-wire	10.0	4.5
EM282	Cardioid	-41 dB	16 dB	78 dB	136 dB	3-wire	10.0	4.5
EM184	Cardioid	-39 dB	22 dB	72 dB	122 dB	2-wire	10.0	4.5
EM264	Cardioid	-37 dB	20 dB	74 dB	120 dB	2-wire	10.0	4.5
EM200	Cardioid	-41 dB	16 dB	78 dB	136 dB	3-wire	14.6	4.5
EM204	Cardioid	-31 dB	16 dB	78 dB	127 dB	2-wire	14.6	4.5
EM283	Figure of Eight	-39 dB	22 dB	72 dB	122 dB	2-wires	10.0	4.5
PanasonicWM61A**	Omni	*-35 dB*	*32 dB*	*62 dB*	–	*2-wire*	*6.0*	*3.4*

** Please not that the Panasonic WM61A is no longer manufactured. We feature the specification here for reference.
The Primo EM258 is a better specified and slimmer replacement for the Panasonic WM61A.