I have been waiting for a receiver that implements at least part of your suggestions in your excellent review of Yamaha's RX-V2400 (see quote below).
While you take your time to prepare your review of the RX-V2500, can you tell us here, briefly, if any of the suggestions have been implemented?
Is the user manual available anywhere for download?
Quote from
http://www.audioholics.com/productreviews/avhardware/YamahaRXV-2400Receiver-p1.html
Suggestions for Improvement
* Parametric room correction (1/12th octave resolution or better) for low frequencies (where it is needed most) with bandwidth limiting application say 20Hz to 200Hz for all channels, including the subwoofer.
* Ability to limit room correction amplitude increments to within a specific +/- range.
* Manually adjustable PEQ settings.
* Multiple equalization settings to accommodate different listening positions.
* Subwoofer output in two channel "Direct" mode by paralleling the incoming audio signal via a relay to the DSP for processing to the subwoofer.
* On the fly non-retained channel trim adjustment capability.
* Independent subwoofer level and crossover settings for two channel and multi channel modes of operation.
* Ability to reroute main channels to "Presence" channels for a 9.1 set-up with external power amps for the main channels.