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A smooth, tapered, one-piece, sound tube of internal stepped bore construction. These are used to increase
high frequency response. They can be used alone or dampened. They are available in 3mm for children and small adult size canals,
and 4mm for larger sized canals. The 3mm horn will increase the high frequency responce by 8-10 dB in the 2000 to 5000 Hz
range. The 4mm will allow an increase of 10-12 dB. These are also available in Emdry-treated to reduce moisture build up.
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