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. Author manuscript; available in PMC: 2013 Aug 13.
Published in final edited form as: Am J Audiol. 2012 Aug 2;21(2):269–294. doi: 10.1044/1059-0889(2012/12-0013)

Table 3.

Clinical Questions 1 and 2: Comparison of WDRC, compression limiting, and peak clipping on HA self- and parent report outcomes.

Citation Condition Compression settings HA preference
Christensen (1999) WDRC Threshold: Low: 45–50 dB SPL
Attack time: 5 ms
Release time: 50 ms
Ratio: Variable: 1.1:1–7.8:1
Volume control: listener unable to adjust during testing
6 of 12 participants returned diary
Participants preference for overall best processing strategy (for all environments): linear PC 1/6; linear CL 2/6; WDRC 3/6
Participant preference for school: WDRC 6/6
Participant preference for home: linear PC 2/6; linear CL 2/6; WDRC 2/6
Willing to switch memories for different listening conditions? yes 6/6
Linear CL Threshold: high 75 dB
Attack time: 5 ms
Release time: adjustable up to 1 s
Ratio: 8:1
Volume control: listener unable to adjust during testing
Linear PC Threshold: none
Attack time: instantaneous
Release time: instantaneous
Ratio: none
Volume control: listener unable to adjust during testing
Gou et al. (2002) WDRC Threshold: 40 dB
Attack time: NR
Release time: NR
Ratio: NR
Volume control: NR
Listening Skills Inventory-Child: significance testing not completed
Listening Skills Inventory-Parent: p < .05 (favors WDRC) in all 12 categories
Own linear Threshold: NR
Attack time: NR
Release time: NR
Ratio: NR
Volume control: fixed
Marriage et al. (2005) WDRC Threshold: 40 dB at 200 Hz; 25 dB at 4400 Hz
Attack time: 5 ms
Release time: 30 ms
Ratio: 1.2:1 to 3.0:1
Volume control: NR
Profound: 7/9 children kept study HAs; of the 7: 5/7 preferred WDRC
1/7 preferred linear CL
1/7 preferred linear PC
Severe: 5/6 children kept study HAs; of the 5: 2/5 preferred WDRC
2/5 preferred linear CL
1/5 preferred linear PC
Linear CL Threshold: high
Attack time: 0.5 ms
Release time: 50 ms
Ratio: NR
Volume control: NR
Linear PC Threshold: high
Attack time: 0.5 ms
Release time: 5 ms
Ratio: NR
Volume control: NR

Note. WDRC = wide dynamic range compression.