Table 3.

Maximum dynamic ranges and suggested BC thresholds for implantable BC devices

Device	Max dynamic range with normal cochlear function [dB HL]					Comment/reference	Max PTAbc at aided PTA =30–35 dB HL
	0.5 k	1 k	2 k	4 k	PTA4
Bonebridge Alt 1	48	68	86	65	67	Calculated*	32–37
Bonebridge Alt 2	55	61	71	60	62	Mertens et al73	27–32
BCI	52	66	78	76	68	Calculated**	33–38
Sophono @ Skullsimulator	51	53	64	50	54	Zwartenkot70	19–24
Baha Divino @ Skullsimulator	64	68	75	68	69	Zwartenkot70	34–39
Baha Cordelle @ Skullsimulator	80	75	87	81	81	Zwartenkot70	46–51

Notes: Dynamic range is calculated from Table 2 and from published MPO dB HL data. Indication range in PTA₄ BC, assuming aided PTA₄ of 30–35 dB HL, is calculated as the dynamic range minus 30–35 dB.

^*Row 1 minus row 5 in Table 2;

^**row 2 minus row 5 in Table 2. @, attached to.

Abbreviations: Alt, alternative; BC, bone-conduction; BCI, bone-conduction implant; HL, hearing level; max, maximum; MPO, maximum power output; PTA, pure-tone average; PTA₄, four-frequency pure-tone average; PTAbc, pure-tone average for bone-conduction.