I thought I read that there was suppose to be an updated firmware release by the end of last week?
post #4411 of 16366
5/30/11 at 9:00am
ARC attempts to Measure the inherent Room Gain in your listening room and preserve that in the solution (within limits). That is, it treats Room Gain as a "desirable" room response characteristic rather than something to be eliminated.
Room Gain shows up on the charts as the shallow hump in the Target curves in the vicinity of the crossover frequencies. If you look at the flat part of the Target curve in the mid-frequencies then the Room Gain numeric value is simply the height, in dB, of the Room Gain hump over that basic volume level of the solution. The audible effect of Room Gain is precisely what you would expect from the shape of that hump. Note that if your sub has great low frequency extension, its Target will stay up at the Room Gain peak level all the way off the low frequency end of the chart.
Movie mixers in particular expect home theaters to have a modest amount of Room Gain. 2-4 dB for example. People mixing music have no such consensus, but in general appear to expect less Room Gain. Thus some folks like to reduce the Room Gain built into in their Music ARC configuration by about 1 dB. It's not at all obvious that you'd really even hear such a modest change.
ARC's attempts to Measure Room Gain can be confused by peaks and dips in the raw speaker output near the crossover frequencies. So ARC puts sanity bounds on its Room Gain solution. It won't apply a Room Gain less than 0dB nor more than 4dB (actually slightly less than that for technical reasons). You can force ARC to apply more than 4dB Room Gain in the Targets window prior to Calculation if you really feel the need to do so.
If ARC is confused by a dip in the Measured curves and thus pegs Room Gain near the 0dB lower limit, often you can get a more pleasing result by forcing it up a modest amount -- say to 2dB. But if your speakers need a lot of boost already near the crossovers, then asking ARC to do an additional 2dB may require more boost than it will allow (i.e., to protect speakers and amps), so you need to compromise raising Room Gain against getting a clean Calculated solution without residual errors off the Target curve.
Preserving the inherent Room Gain in your room has the added advantage that natural sounds in sound tracks (e.g., doors closing, male voices), sound more like the real events that might happen in your listening room. Room Gain is part of what gives you the pleasant feeling you are listening in a home theater rather than an anechoic chamber.
Since ARC is attempting to Measure the ACTUAL Room Gain of your listening room, rather than just applying some preset adjustment chosen by the engineers, the Room Gain values you get will vary depending on all the things that can vary an ARC Measurement -- including changing mic locations or shifting the speakers. Large listening rooms, or rooms with extensive acoustic treatment, will generally have a lower Measured Room Gain. If it comes in below 2dB, you could experiment by raising it up to 2dB in Targets before you Calculate. Trust your ears.
Very nice explanation, thank you.
I would like to test out the MRX 300 in my system as I think it will be superior to my pioneer ax2, which is getting old.
I'm using external amplification on 5 of the channels via a Primare A30.5 power amp, almost 60 lbs, so pretty beefy. That's why I'm going for the MRX 300 as it will essensially function as a pre.
Anyone else using the MRX series as pre?
anyone compared a MRX-500 with an Arcam AVR400 yet ? I'm hoping to get a demo of both as not sure which way to jump
over here in UK
|Anyone else using the MRX series as pre?|