7.1 on 5.1 system with software decoding in LAV
Hi folks, I apologize in advance if this was asked before. I tried searching through this thread but couldn't find anything similar.
So I have an HTPC (Intel HD4000 GPU) that is connected via HDMI to my Yamaha RX-V375 receiver (5.1 output only). Up until now, I have been bitstreaming lossless audio (DTS-HD-MA and TrueHD) to my receiver and things have been working great. However, I recently purchased the PB12-NSD subwoofer from SVS and in the process of using REW to optimize sub placement, I came across the wonderful Equalizer APO software that lets you EQ your sub/speakers at the Windows audio driver level. This works wonderfully, but in order to leverage the EQing advantage with my sub, I need to decode the audio in software to PCM prior to sending it out to my receiver.
So I got my TMT dll (dtsdecoderdll.dll) into LAVfilters folder and all is working well. HOWEVER, I am unclear on whether I am getting the same audio now when I play 7.1 lossless tracks.
When bitstreaming, I'd assume that the receiver would realize it was getting a 7.1 track and would figure out how to downmix the missing 7.1 channels into 5.1 thus allowing for some of the audio to the extra 2 channels being accounted for in my 5.1 surrounds.
However, when decoding in software, it appears that the 7.1 track just gets decoded into 7.1 PCM. What is not clear to me is whether the receiver still detects the PCM audio track it receives as being 7.1 and performs the same downmixing to incorporate audio from the missing channels or whether it simply discards the extra channel audio info. Would I need LAV Audio to perform this downmixing in software prior to outputting the PCM track to my receiver? If so, what setting would I need to use within LAV audio to achieve this?
I'd really appreciate any advice/suggestions on this matter!