Originally Posted by audyssey
Nope. The front and center crossovers are the frequency used to send bass to the sub from those channels. So, everything below 120 Hz in the center and everything below 150 Hz in the fronts is sent to the sub. The LFE is a separate track in the content. It is lowpassed at 120 Hz during production so the LPF should always be set to 120 Hz. Manufacturers seem very confused about this and allow the user to change it. They (not Audyssey) also set it to 80 Hz for no reason. It should never be any number other than 120 Hz.
Do you know how Marantz implements this? I am a bit confused in setting up my SR8001 Marantz. The Denon AVR-3808CI I had recently configured was pretty easy to follow because post set-up with MultiEQ-XT it allowed one to change the crossover frequency setpoints for each channel, and then it had an LFE setting (which you are referring to as the one that should always be set at 120 Hz). Now, for my Marantz' SR8001 implementation of MultiEq, there are a few things that confuse me:
First, after running the 6 positions and analyzing I was able to "check setup" and see the outcome of the MultiEQ effort for "speaker config" "speaker size" "distance" "channel level" and "crossover freq" and, while I could view these results, I could not modify them in this portion of the set-up. (hence, I concluded I could only try to find the same setup areas under "manual setup" later, but some of these, like crossover frequency on a per channel basis I could not find...more below)
Appropriate results seemed apparent for "speaker config" and "distance". "Channel levels" seemed close upon later checking via the numbers MultiEQ put in the "Manual Setup", which I verified with an SPL in the primary listening position (though 2 non SW channels seemed a few db off..maybe 3-4)
I have no idea what MultiEQ interpreted insofar as "speaker size" and "crossover frequency" because all it reported in Marantz' implementation was "Auto" for each speaker size and also for crossover freq for the front, center, surr, and surr.b. This doesn't leave one with much knowledge on how they would begin to manual over-ride
Anyway, all of this leads to these questions:
1) First, should I or should I not use the SPL meter to do final adjustment of the channel levels that Audyssey is reporting on the Marantz? (note, when I did AEQ with the Denon it was spot on across all 8 channels. with the Marantz I have 2 non LFE channels that might be 3-4 db off). If I do adjust, will this negatively impact the eq curves, etc. because they were created with certain channel levels preset by Audyssey, etc.
2) I don't know what to make of the "Auto" descriptors for "speaker size" and "crossover frequency" At least for "speaker size" I was able to find values under Manual Setup that indicated all speakers other than the front R and L were set as small and those 2 were set as large. Hence, since their -3 db limit is around 48Hz, I set them to Small as well per Audyessey guidelines, so now I have all speakers set to Small. However, I see nowhere else where I can study crossover frequencies (nor modify them manually) for any of the other channels that were reported out as "Auto" by MutliEQ. (i.e. for front, center, surr, and surr.b) In fact, I also do not see an "LFE" setting. In the Manual set-up area I only see the ability to change speaker distances, speaker sizes (which, again, I forced all of them to "small") channel levels, and finally...and this is my real question, a setting for LPF/HPF. This is NOT explicitly stated as LFE LPF/HPF...and based on the owners manual description of "select cutoff freq. for any "small" speakers that are used in the system" it makes me think this is a global crossover frequency setting and NOT the real LFE LPF/HPF setting you recommend to be set at 120Hz on an always case. (note, if this is the case they are VERY confusing by using LPF/HPF instead of just "global crossover" or something). Obviously, if LPF/HPF is really a global crossover I would set it at around 80 Hz based on the rolloff curves for all my speakers. Then, I would want to know where do I set the real LFE filter setting at? I can not find it. If the LPF/HPF menu setting is REALLY an LFE setting, then following your suggestion I would put it at 120Hz, but then my question is where are the independent (or global) crossover settings for the non LFE channels?? Does this mean I can't set them anywhere if the LPF/HPF descriptor is for the LFE only?
Sorry for my lengthy description, but hopefully the source of my confusion is clear. I have done a LOT of reading here, in the SR8001 thread, and on Mutli-EQ FAQs and am more confounded by the Marantz implementation I think than the concepts of what I would like to do. Not sure how to interpret the menus in this Marantz I guess.