Knowles is the originator of balanced armature technology which they apply to their receiver, specialty transducers and hearing aid products. Knowles is also a market-leading manufacturer of MEMS microphones, electret microphones, voice processors and acoustical component accessories.
| Product status | Active  | 
		
|---|---|
| Description | Balanced armature receiver  | 
		
| Frequency response curve | Full range  | 
		
| Configuration | Single  | 
		
| Diameter / length [mm] | 5.16  | 
		
| Width [mm] | 3.51  | 
		
| Thickness [mm] | 3  | 
		
| DC resistance [Ohm] | 20  | 
		
| Sensitivity @ 1kHz, 100 mV, in coupler [dB SPL] | 105  | 
		
| Vented | No  | 
		
HC Series provides increased low frequency dynamic range in a package size equal to FC.
| Product status | Active  | 
		
|---|---|
| Description | Balanced armature receiver  | 
		
| Frequency response curve | Full range  | 
		
| Configuration | Single  | 
		
| Diameter / length [mm] | 5.16  | 
		
| Width [mm] | 3.51  | 
		
| Thickness [mm] | 3  | 
		
| DC resistance [Ohm] | 20  | 
		
| Sensitivity @ 1kHz, 100 mV, in coupler [dB SPL] | 105  | 
		
| Vented | No  | 
		
HC Series provides increased low frequency dynamic range in a package size equal to FC.
| Product status | Active  | 
		
|---|---|
| Description | Balanced armature receiver  | 
		
| Frequency response curve | Full range  | 
		
| Configuration | Single  | 
		
| Diameter / length [mm] | 5.16  | 
		
| Width [mm] | 3.51  | 
		
| Thickness [mm] | 3  | 
		
| DC resistance [Ohm] | 20  | 
		
| Sensitivity @ 1kHz, 100 mV, in coupler [dB SPL] | 105  | 
		
| Vented | No  | 
		
HC Series provides increased low frequency dynamic range in a package size equal to FC.