Proceed HPA2 - Manual (Page 23)

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The outputs of these two channels are then connected to two sets of binding
posts on each loudspeaker. The loudspeaker’s internal crossover continues to di-
vide the frequencies appropriately among the various drivers.
To facilitate biamping, all Proceed power amplifiers have the same voltage gain
and input sensitivity. We even adjust for the difference between single-ended and
balanced signal levels, should you have to mix the two. Because of this fact, you
should not have to concern yourself with adjusting the relative volumes of the
bass and treble sections of your loudspeakers—if they sounded good with a
single amplifier, they should sound better when biamplified.