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Figure 2. Cross section of the ISL ATF (1) shell, (2) head cavity, (3) damping foam blocks, (4) wooden base, (5) cavity of the brass shell surrounding the measuring equipment, (6) B&K bend (type WU 0278), (7) microphone preamplifier (B&K 2633), (8) foam sleeve, (9) brass shell, (10) cable, (11) stuffing box, (12) damping foam block, (13) circular coupling, (14) auditory canal extension (HEAD Acoustics), (15) outer ear cheek (HEAD Acoustics), (16) ear simulator (B&K 4157) equipped with a B&K microphone (type 4136) and a B&K adaptor (1/2" - 1/4"), (17) suspending spring

Figure 2. Cross section of the ISL ATF (1) shell, (2) head cavity, (3) damping foam blocks, (4) wooden base, (5) cavity of the brass shell surrounding the measuring equipment, (6) B&K bend (type WU 0278), (7) microphone preamplifier (B&K 2633), (8) foam sleeve, (9) brass shell, (10) cable, (11) stuffing box, (12) damping foam block, (13) circular coupling, (14) auditory canal extension (HEAD Acoustics), (15) outer ear cheek (HEAD Acoustics), (16) ear simulator (B&K 4157) equipped with a B&K microphone (type 4136) and
a B&K adaptor (1/2