SUMMARY (a bit of a strange question): a Denon AVR-2807 that i've recently bought works fine when fed with any digital input (via HDMI or with an optical or co-ax audio signal) but i can't get any sound out of it when i try to feed it anything analogue! i've download the manual and i think everything is setup correctly - is there some trick that i may be missing e.g on the setup menu or the control panel/remote?
i have a Cambridge Audio CXU Bluray player (awesome!) connected to a pair of KRK Rokit 10-3 G3's (awesome x2!) and a REL Storm 5 (set at a low-level as it's already overkill!), using the variable phono pre-outs on the back of the CXU to control the volume. it's a whole hi-end system in just a few small boxes (apart from the massive active speakers...) and blissfully simple for CDs/SACDs/DVD-As/mp3s (my desktop soundcard is connected to the optical input on the CXU), as well as movies (blurays obviously but the CXU also has an HDMI-input for my FreeviewHD PVR, where it all benefits from the Darbee processing, before heading to my projector). however, this is only a 2.1-setup and so i figured it was about time to add some surround-action. i can't afford 4 small KRK Rokits for the surround channels (and didn't fancy running mains cable all over my room to power them, anyway), so i decide to use some Elac passive satellite speakers i had in storage. this means i need some means of powering the Elacs. given the horrific price of multi-channel power amps (for my budget, at least!) and my lower focus on AV vs stereo, i decided to look for an older but decent AV amp with a 7.1-analogue input, so that i could send the remainder of the 7.1-preouts (centre, sub, surround L/R and side-rear surround L/R, while noting that i don't have a centre speaker as KRK don't make a centre to match the 10-3's yet) i.e use the integrated AV amp as a dumb power amp. i'm aware that i'd need to match the volume of the AV amp to my KRKs but, borrowing a friend's SPL meter, i thought it wouldn't be too hard to achieve a reasonably even soundfield (not perfect, but certainly good enough). it also has the power-saving advantage that i can just switch-off the AV amp when listening in stereo, which is most of the time, for me. and it doesn't interfere at all in the purity of my existing stereo signal path.
so, i buy myself a Denon AVR-2807 and connect up all the preouts on my CXU to the EXT-IN 7.1 input on the Denon (apart from front L/R, which continue to go straight to the KRKs), switch the input selector to EXT-IN and... - nothing. there is definitely sound coming from the CXU surround preouts, as plugging the KRKs in to any of the surround preouts produces sound from the KRKs. so it's not the CXU. i connect my CXU to the Denon via HDMI (plus add a pair of front L/R speakers to the Denon for testing purposes and ensure output is set to A+B) and there's sound coming from everywhere (i.e carrying out a speaker config for each individual speaker using test tones works as expected). so the power amp stage for each channel on the Denon is ok. i start scratching my head... as a test, i then connect the front L/R CXU preouts to various standard phono inputs on the Denon (marked DVD, TV, VCR etc on the 'in' side, not on the 'loop/out'-side, of course,) check in the on-screen menu that all these inputs are not set to expect a digital input, then scroll through each in turn via the input selector, where each input shows 'analogue' on the display - no output from the speakers connected to the Denon from any of the inputs. so the Denon appears to work fine for digital inputs but not at all for any analogue inputs. is this a weird fault? or am i missing something?
the guy i bought it from has been very helpful and friendly but cannot recall if he ever had anything analogue connected up to it (after he had it, it had been used in an in-ceiling install then sat unused for a while, before he got round to selling it to me), so there's a possibility that perhaps there's something wrong with the analogue input stage/ADC (i presume all analogue signals get converted to the digital domain?)? or perhaps with the way the control circuitry is handling analogue inputs? i've successfully factory reset the unit ('small power+night+pure direct' buttons, display flashed, kicked in to 'tuner 87.50' etc) but this made no difference. i could just send everything via HDMI from my CXU to the Denon and use the preouts on the Denon to drive the KRKs but i really don't want to do this - as good as the Denon is, this adds another element to the signal path and i've found that the Denon's signal-handling and DAC/preout-stage is just not as good as the CXU's (and it'd mean having to keep the Denon switched-on all the time, while i'm just listening to music).
apologies for the lengthy message and look forward to hearing if anyone can shed some light on things