I religiously used Room Correction EQ when I had a dedicated Home Theater in my basement (Northern VA).The results were fantastic as I could place SUB, rear and side surround speakers for best results. As well as add acoustic treatment.
Seven years ago I moved to Florida the no basement zone, and to a large open concept ranch style home to boot. Acoustic nightmare.
The use of Room Correction tech drove me mad.
As the perfect can be the enemy of the good.
My "Solution" was to upgrade to more more aesthetically pleasing (to my wife of course) efficient power towers (first Def Tech STS, later ST-L) added to my SUB. Do I miss my dedicated basement Home Theater? Hell yes. Would I rather have stayed up north, left on the cold and divorce?
Hell no.
Go ahead use Room Correction EQ to your hearts content or to endless frustration, user beware.
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How I Put Audyssey Room Correction to Work for Me
High frequency issues, such as excess reverberation or even more serious problems such as sound bouncing off tile floors or one or more walls of windows, can be hard to treat. But they can minimized though not always in a domestically acceptable manner. If you love your shiny tile floors you might object to covering them with a thick carpet. If you love that open, full-wall view from your 50th floor Manhattan penthouse, hanging heavy drapes might be followed by divorce papers. You’ll find no shortage of help claiming that this sort of room isn’t a problem, and if you only spend gobs of cash for the right speakers, which they’re only too ready to sell you, the problems will go away. They won’t. Some situations will be intractable unless you’re willing to accept that you’ll need to add acoustic room treatments of some sort—or move.
Problems in the bass, roughly below 400-500 Hz, are different. They arise largely from reflections between adjoining walls, setting up standing wave patterns that interact to produce peaks, dips, and even nulls in the response. These cause the bass response to vary in different parts of the room. Some rooms have fewer such problems than others, depending on their shape and dimensions, but few of the rooms any of us are likely to live in are totally free of them.
The most obvious treatment for these bass issues is carefully and tediously repositioning the speakers and the listener to positions that minimize these modes at the listening position. But in most domestic situations, where the furniture “must go here,” or in a home theater setup where the screen’s location is fixed and the speakers must be positioned to support the picture, your flexibility is limited. You can’t have the screen on the front wall, the main speakers on the left side of the room, and the listening seats on the right! That’s one among many reasons why separate subwoofers, which are non-directional up to a point, are useful; they allow the main speakers to be located where they have to go while putting the subs wherever they perform best. But positioning subwoofers for the optimum result (and more than one are desirable for reasons beyond the scope of this blog) is a major topic in itself.
Physical room treatments that can deal with bass, such as bass traps, are generally too large to be practical in a home situation. But electronic equalization, or room EQ, is a friendlier solution, though not a perfect one (there’s no such thing as perfection—in audio or anything else).
Various types of manual- or computer-adjustable graphic and parametric equalization exist, but require considerable skill and test tools to use properly. You can’t do room EQ by ear, though that hasn’t stopped fools with graphic equalizers from trying to do so over the years (including me, at a more naïve age).
But there are three popular forms of room EQ available to users with at least minimal technical skills: Dirac Live, Anthem Room Correction (ARC), and Audyssey. All come with the needed microphones. The first two require a home computer of some sort, but Audyssey doesn’t. (There are other room EQ formats as well, but they’re generally either proprietary, such as from Yamaha and Onkyo/Integra, or found in crushingly expensive products from the likes of Trinnov and JBL Synthesis).
I have no experience to date with Dirac Live, and limited experience with ARC in Paradigm subwoofers and Anthem’s premier 2-channel integrated amplifier (the latter reviewed recently by editor Al Griffin and by yours truly in the July 2018 issue of Stereophile.
Audyssey Put to the Test
The Marantz surround preamps I’ve used for the past three years offer Audyssey, which I used only briefly in the past on the AV8802A. But the new AV8805, now in my system, offers it as well, together with a new feature allowing the user to limit the top end equalization to any preferred frequency. But for this test I used it full range. Even then, however, the before and after results differed little above about 1 KHz (which is why the results depicted below only show the results up to that frequency).
Audyssey is intended to not only improve the room response but to do so at a range of seating positions. For that purpose it takes a number of readings (typically 8) in different seats and provides an averaged, single correction. For this test, however, I tightened up the positioning to remain within a foot or so of my ears at the main listening position—a more audiophile-centric approach. Give me the best the system can do at the “money seat.”
The responses shown here were achieved with the standard Audyssey microphone that comes with the Marantz AV8805. No computer is required (the computations are performed inside the Marantz). But the results shown here were taken with the Omnimic measurement system from Parts Express (which does use a PC), together with the dedicated Omnimic microphone. The initial, Audyssey-miked measurements used the standard Audyssey 8-position average, but the results shown here were taken at a single position at the main listening seat (my measurements have shown that averaging several measurements reasonably close to the listening position differ little from the single measurement, at least in my room).
What did I achieve? A great deal. But my very large room is so resistant to producing deep bass that I also had to add a boost from the Marantz’ bass control on top of Audyssey’s curve to keep the final result from sounding too thin. That boost is included in the measurements shown here. (Interestingly, these measurements showed that the Marantz’ bass control, at least with Audyssey engaged, raises the overall bass range more or less equally, rather than providing a progressively higher boost as the frequency drops as do most bass controls). The non-equalized "before" responses are shown on top in Fig. 1, and the "after" results in Fig. 2 (left channel in red, right channel in blue).
Two subwoofers were used in the curves shown. The equalization did help when the speakers were used full range without the subwoofers, improving on their already respectable pre-EQ performance. But it would be wise to use caution when pushing full-range speakers this hard (Audyssey plus bass boost) in a very large room. This could overdrive all but the largest speakers without a subwoofer, a problem I did experience here when I tried the result, sans subs, on the most demanding music tracks.
Adding a subwoofer (or two, as I did here) helps considerably in limiting the strain on full-range speakers. But even then I’d take care in viewing the responses shown here, reaching down to 20 Hz, without reservations. As you can see on the vertical scale, the output levels for the measurements were well under 85 dB — a tepid bass level in a movie where civilization is blowing up all around you. All but the most robust subwoofers will beg for mercy with the EQ pushing them this hard on such material in a big room.
If your room is large, at say over 5,000 cubic feet, a wise precaution would involve putting the deepest bass-heavy passage you can find on repeat. Start playback at a low level and increase it gradually until you hear signs of distortion. Generally this will resemble…um…flatulence well before you hear mechanical rattles. It’s also possible that the subwoofer amp will clip -before the driver bottoms out, or that it offers built-in limiting to prevent the worst from happening. Back off a bit and that’s as high as you should listen.
What’s the solution if this isn’t loud enough? Reduce the bass by backing off on bass emphasis you’ve added, if any, to the room EQ’ed response. Then reduce the level of the subwoofer(s), or find a way to roll it (them) off below a suitable low frequency, perhaps 30 Hz. If your sub offers the option of a ported or sealed setup, and you’ve been using it ported, change it to sealed and re-run Audyssey. Or get more, or better, subwoofers. Or a smaller room!
Audyssey could do with an update, but to offer everything I’d like to see would require more processing power than is currently available in a surround preamp or AV receiver. That means having an external computer do all the calculations (as in Dirac Live and ARC) and then loading the result into the AVR or surround preamp. This offers the sophistication of having more than one target curve stored in the computer, with the ability to reload curves at will.
I’ve rarely use room EQ in speaker reviews for obvious reasons, and then only when it’s for a specific purpose and clearly identified as such. I’ll continue to do the same in reviews going forward. But if your system includes room EQ and you haven’t used it, it’s worth a try.
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COMMENTS
Here are a few of the odd results I got from Audyssey on my Marantz SR7011. The corner subwoofer placement is 10' from my seating position. Audyssey would measure my old ported sub 25' or more away. I replaced it with an SVS SB3000 and now it's only 15' away. The other speakers are spot on.
I have 4 identical Atmos ceiling speakers. Audyssey correctly sets the crossover for the rear ones at 60 Hz but crosses over the front ones at 80.
My surround back speakers are bookshelf models rated at 45 Hz to 25 kHz. Sometimes they come up as large and other times as small.
When I compare the Audyssey result of my center speaker with a sound meter they differ by as much as 3db.
I'm the last one to trust my ears but I hear little or no difference with Audyssey engaged. Maybe it's the simple layout of my 14' x 18' room. The floor is thick vinyl, the drop-ceiling has acoustic tiles, and even though the walls are 1/4" wood paneling they are broken up by several bookcases, shelves and picture frames. I plan to eventually return to separates preferably with Dirac.
Excess reverberation, as well as more serious issues like sound bouncing off tile floors or one or more walls of windows, can be difficult to treat by slope ball. They can, however, be minimized, though not always in an acceptable manner. If you adore your gleaming tile floors, you may be opposed to covering them with a thick carpet. I agree with that opinion. A convincing explanation.
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Make sure your speakers and subwoofer are properly heardle placed and connected to your AV receiver. If you have a microphone that came with your Audyssey system, connect it to your receiver as well.
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Ensure that your speakers are properly positioned and connected to your receiver heardle unlimited or audio processor. Make sure your microphone is connected to the appropriate input on your receiver.
Room correction is indeed a process aimed at addressing the acoustic issues present in a room, particularly small rooms Amanda The Adventurer where such problems are more noticeable. Even larger spaces like concert halls have their own unique acoustic challenges, but they differ in nature due to their size.
There are no further comments on this article, this is a specific review and assessment of sound quality octordle
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Keep in mind that Audyssey Room Correction can significantly improve audio quality, but it may not address all room acoustics issues. Consider additional acoustic treatments such as rugs, curtains, or bass traps to further enhance the listening experience.
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