| http://www.w3.org/ns/prov#value | - The HPA-1 had dip switches allowing gains of +0dB, +10dB, +18dB, and +20dB. The HPA-2 no longer has the switches and the gain is fixed to +15dB. This should not affect most headphones that are high impedance or are inefficient, but unlike the IEM buzzing issue, using even full size efficient headphones with the unit may be problematic due to reduced volume adjustment range.
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