목적: It was reported that the application of preoperative test-band helps predicting postoperative hearing outcomes and BAHA intenso showed higher functional gain than Sophono alpha 1. We wanted to compare the functional gain using head-bands with new models (BAHA BP 110 POWER and Sophono alpha-2 MPO) in induced unilateral conductive hearing loss model using ear plugging. 방법:An earplug was inserted in right ear canal of 30 normal subjects with normal hearing and tympanic membrane, inducing unilateral conductive hearing loss. A test-band using BAHA BP 110 POWER (BAHA group) and Sophono a-2 MPO (Sophono group) was placed on the right mastoid tip and left ear was masked. Pure-tone was performed and word discrimination score (WDS) was obtained with the sound of 40 and 60 dB HL. BAHA BP 110 POWER was set to generate maximal gain, and Sophono a-2 MPO was set to show maximal level of gain while assuring minimal feedback. Four- frequency functional gains (FG), FG at each frequency and WDS at 40 and 60 dB HL of both groups were compared. 결과:The 4-frequency air-conduction thresholds in normal ears and induced hearing loss model were 3.52.7 and 37.67.11 dB HL. Functional gain (14.55.9 dB) of Sophono group was significantly higher than that (8.415.14 dB) of BAHA group (p<0.001). Regarding each frequency, Sophono group showed statistically significant higher FG than BAHA group at 1, 2, 3 kHz (P<0.001), however no significant difference was shown at 0.5 kHz. The WDS (85% and 98%) at 40 and 60 dB HL of Sophono group were significantly higher than those (73% and 95%) of BAHA group (p<0.001). 결론:Although BAHA intenso showed higher functional gain than Sophono alpha 1, Sophono alpha-2 MPO showed higher functional gain than BAHA BP 110 POWER. This study provides instrumental profile of each hearing devices and may support clinicians in choosing the adequate hearing aids in terms of clinical practice.