Table 3.

Examples of required and maximum available gain and output from a state-of-the-art power hearing aid in a patient with mixed hearing loss (MHL), compared to a patient with sensorineural hearing loss (SNHL) only

		SNHL				MHL
	Frequency, kHz:	0.5	1.0	2.0	4.0	0.5	1.0	2.0	4.0
Situation	AC, dB HL	70	75	80	85	70	75	80	85
	BC, dB HL	70	75	80	85	25	30	35	40
	ABG, dB	0	0	0	0	45	45	45	45
Required gain	1/2 BC + ABG +ki, dB	35	37.5	40	42.5	57.5	60	62.5	65
Available gain	dB	75	77	70	54	75	77	70	54
		√	√	√	√	√	√	√	$$
Required output	AC + 35, dB	105	110	115	120	105	110	115	120
Available output	dB HL	121	131	122	112	121	131	122	112
		√	√	√	$$	√	√	√	$$

Average available gain and output have been calculated by using the marked values of Table 1.