Quote:
Originally Posted by
Nick @ Anthem 
DS-21, when you originally mentioned peaks in the crossover region I took that statement at face value, imagining a resonance, not realizing that you meant overlap between subs and mains increasing the output. The solution in this case: Since sub and main crossovers can be set separately, just spread out the settings until your ears like what they hear. The problem is that this can only be done on AVM/D, not MRX.
I don't remember if I mentioned peaks or dips, but every time I've run ARC there have been audible and measurable issues with the sum of mains and subs as set by ARC, as measured by full-range mono sweeps from (if memory serves) 16-200Hz. The reason for the issue is that ARC (like Audyssey, et al.) it doesn't do what's needed (a sweep to cover mains AND subs simultaneously) to see how they interact in a room.
ARC isn't alone in this shortcoming, of course. Because I think ARC is by and large better than competing AVR-level room correction systems (and at this point I'm not inclined to spend five-figures on the Trinnov box that would be the only thing more likely than not to be a real upgrade for me over the MRX 300) this shortcomings are more glaring to me.
Admittedly, I'm horrible at saving measurements to files. I'm generally more interested in hearing what happens than in saving my documentation. That's one reason I started a blog, to force myself to save my bloody measurements, and store them where I can access them when I want to make a point.
Quote:
Originally Posted by
Nick @ Anthem
I remember your inquiry about how LFE is handled and believe the reply from one of the tech reps was to the effect of AVM/D keeps the LFE but MRX doesn't when sub channel is disabled (there's that AVM/D vs MRX problem again). I'm not going to get into the reasons for it, but it's not going to change.
I remember that, ca. last March. But my most recent (and unanswered) inquiry was very different.Here it is, in condense form, if anyone at Anthem wants to take a stab at answering it.
How should I set up the MRX such that ONLY the LFE channel is sent to the sub-out and all the other channels get no LFE channel. Alternately, what settings do I need to make to ensure that an external box gets the 4 signals - LCR+LFE - in their correct proportion for external bass management. Then I can simply send things with an outboard box, and do bass management appropriate to my room and system.
Perhaps to some that question requires "custom engineering." But it seems pretty straightforward to me...
Quote:
Originally Posted by
J_Palmer_Cass
When it comes to bass management, I don't know of any company that discloses the details on how they do things internal to the unit. Now if you want to make the unit do something it was not designed to do and you want someone else to figure out how to do it, then that would be custom engineering. How to connect multiple subwoofers in a non standard manner is your problem as is speaker selection.
What I had to do was take 5.1 channel test signals, and then document how bass mangement works in my unit (Sony AVR). Every time I change a speaker size in the AVR (small/large/none), then bass management changes. Bass redirection is very tricky. Unless you document your unit on your own, you will never figure it out.
How did you get the signals routed? FuzzMeasure only has 2-channel output and the MRX doesn’t have multichannel analog inputs.
Quote:
Originally Posted by
J_Palmer_Cass
The LFE discard when no sub is selected is problematical. Does LFE discard mean discard the .1 LFE channel, or does it mean discard the LFE channel plus all redirected bass signals? The term LFE is used in various ways on this forum.
I tend to be precise about the definitions of words when I write. LFE channel has a defined meaning (aka the point-one), so that’s what I use.
Quote:
Originally Posted by
markus767
I don't "claim to be a Geddes expert". To my knowledge he doesn't recommend setting the mains to large anymore because of the problems mentioned above. It's probably easier to ask him yourself as he is pretty accessible:
http://gedlee.com
Really? I missed that memo somewhere. I thought his current recommendation was to set the processor to no sub, and do bass management externally.
Quote:
Originally Posted by
J_Palmer_Cass
Markus, you just do not have a good handle on bass management and bass redirection. Depending on settings, bass may be sent to the subwoofer, or it may be sent to other large speakers, or it may be sent both. Different speaker size settings change bass redirection and mix levels in addition to appying the applicable low and high pass filters. The only easy to understand combinations are all large speakers with subwoofer, and all small speakers with subwoofer. All other speaker size combinations do not follow obvious bass / lfe routing.
For an example, if I select certain speaker size combinations in my unit, the .1 LFE channel is redirected to every speaker except for the center.
My R & L mains are indeed set to large. That means an electrical HP filter is not applied to the main speakers (same as Geddes). That does not mean the subwoofer is not used or can not be used or will not be used or the R & L speakers are not crossed over to a subwoofer. Setting the R & L mains to large means that bass is not redirected and mixed the same way as the all small plus subwoofer redirection scheme.
In most rooms, that approach will fix one problem (low bass headroom) but do nothing to fix what is IMO the bigger problem by far: extreme unevenness of upper-bass reproduction from “full range” mains, due to the effect of room modes.
Quote:
Originally Posted by
J_Palmer_Cass
I don't throw a lot of speakers around the room like some prefer to do for whatever reason they chose to do so.
The reason is that we prefer high-fidelity upper bass reproduction over a fairly decent seating area to low-fidelity upper-bass reproduction everywhere.
