Axiom Home Page Forums General Discussion Technical Questions Muddy vocals from center channel

Here's the instructions, according to my Pioneer AVR.

While listening to a source, press [RECEIVER], then press [STANDARD] (Standard Surround). If necessary press repeatedly to select a listening mode.

If the source is Dolby Digital, DTS, or Dolby Surround encoded, the proper decoding format will automatically be selected and shows in the display.

With two channel sources, you can select from (see note 5):
Pro Logic IIx Movie - Up to 7.1
Pro Logic IIx Music - Up to 7.1
Pro Logic IIx Game - Up to 7.1
Pro Logic - 4.1 (Mono sound from the surround)
Neo:6 Cinema - 7.1
Neo:6 Music - 7.1
Neural THX - Up to 7.1

With Multi-Channel sources, if you have connected surround back speakers(s) and have selected "SBch ON" you can select:
Pro Logic IIx Movie - Up to 7.1
Pro Logic IIx Music - Up to 7.1
Dolby Digitel EX - Creates surround back channel for 5.1.
DTS-ES - Allows you to hear 6.1 with DTS-ES encoded sources.
DTS Neo:6 - Allows you to hear 6.1 with DTS encoded sources.

Note 5: If surround back channel processing is switched OFF or the surround back speakers are set to NO, Pro Logic IIx becomes Pro Logic II (5.1 channel sound)

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I'm a little confused, because I always have it set on standard Neo:6 Cinema (which is still standard), but no matter what I play, it never does any automatic switching, it seems, because the display always says Neo:6 Cinema. Possibly because I don't have any surround speakers.