Appendix.

HA and Procedural Details

Citation	HA model	Experimental feature	Other features	Fitting prescription	Monaural/binaural testing
Auriemmo et al. (2009)	Widex Inteo IN-19 or IN-9	FT	Fully adapted directionally Multiband Active feedback   cancellation system Classic noise reduction Slow-acting WDRC 15 channels   Active feedback   cancellation (CP) Gain limitation   feedback mechanism (FT)	Manufacturer proprietary	Monaural soundfield testing
Glista et al. (2009)	Prototype BTE HAs similar   to Phonak Savia 311 or 411	NLFC	Omnidirectional Two band Amplitude   Compression Multichannel Noise reduction   disabled Automatic program   selectors disabled	DSL v5.0	Binaural
Miller-Hansen et al. (2003)	AVR ImpaCt HA   (FC with DCB) CP HAs, not further   specified (CP)	FC with DCB	2 channel (FC with DCB) Not specified (CP)	DSL [i/o]	Binaural
Smith et al. (2009)	Widex Inteo 9 and 19	FT	Amplitude   Compression 15 channel Feedback cancellation   limits	Manufacturer   proprietary	Binaural
Wolfe et al. (2010, 2011)	Phonak Nios	NLFC	Microsized BTE	DSL v5.0	Binaural

Note. BTE = behind the ear; CP = conventional processing; DCB = dynamic consonant boost; DSL = Desired Sensation Level; FC = frequency compression; FT = frequency transposition; HA = hearing aid; [i/o] = input/output; NLFC = nonlinear frequency compression; WDRC = wide dynamic range compression.