What to do if the receiver is not flexible enough to handle LFE levels properly?
Speaker trim can be used to workaround receivers that do not boost the LFE input. This is because the redirected bass from the main channels is attenuated before it is mixed with the LFE signal. The receiver should boost the subwoofer output signal of the player anyway, so applying channel trim to the subwoofer in the player can achieve the same result, although this is not recommended since it defeats the purpose of leaving enough headroom through the interconnect for the subwoofer signal. Please note that it is not particularly useful to compare what the OPPO is doing to what other players do, as many other players screw this up in one way or another. Even players from the major “audiophile” manufacturers have been known to ship with LFE level bugs of one form or another.
