Originally Posted by Ronman79
Is anyone having any issues with THX Cinema or Loudness Plus. ...
My problem is that it does weird things to my system well before ref level. For example, when watching a blu-ray with heavy effects (explosions, etc. with lots of low end), I cannot use "THX Cinema". Around -10 or so, I get a nasty, muddy distortion from the subs, especially the smaller one (running an 8" and 10" powered sub with an RCA splitter from the LFE output).
I do NOT have this issue when using "Direct", and it sounds great. I just don't think that I should have the issue when using the THX mode...
I suspect that what you describe is the result of a bad combination of room interaction, the program mix in the LFE channel, the crossover value used and whatever Dynamic compensation is in use.
I've encountered the same problem when trying to use Audyssey Dynamic EQ/Dynamic Vol in Prologic II Movie mode with DD5.1 material and when using THX Cinema/Loudness Plus, but the manifestations were different.
Listening at a volume setting of -20 to -15dB, with the Audyessy suite engaged, there were occasional "gloop" sounds from the sub and I could see the cone moving to the limit.
Using THX Cinema/Loudness Plus there were no "gloops" but the low bass was unevenly pumped too high for my taste.
Other business has prevented me from exploring this, but I did check the speaker settings and the sub was shown as being at half the correct distance, while the largest error on any other speaker was <1 foot.
That makes me wonder if there is a null at some critical measurement frequency. If the program material is rich in the vicinity of the null frequency, there could be a huge degree of boost (much like setting the trim to +12dB) in an attempt to compensate.
With no dynamic compensation engaged, just Audyssey MultEQ XT, the sound is so much improved over the previous setup that I am not unhappy. If the Dynamic modes were trouble free I would be happier.
I would like to resolve the issues with dynamic modes, but I suspect that it require more time than I can give it at the moment--I haven't had time to search the Audyessy thread, nor to re-position the sub and re-run setup or to try changing the crossover points for the mains.