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Post by bitzerjdb on Feb 2, 2022 10:33:47 GMT -5
Not to be a jerk, but if ttocs is right (and I'm pretty confident he is, his work is excellent), where is the testing before a firmware release? This was a small release....how hard is it to test in all sound modes.
I'm pretty frustrated at the way Emotiva is handling their software development..this really is basic stuff (I worked in this space for 20+ yrs). Develop in DEV, Test in QA, Roll out to Production. This type of failure should have been caught in DEV and never made it to QA.
Sigh...
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ttocs
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Post by ttocs on Feb 2, 2022 10:49:27 GMT -5
Not to be a jerk, but if ttocs is right (and I'm pretty confident he is, his work is excellent), where is the testing before a firmware release? This was a small release....how hard is it to test in all sound modes. I'm pretty frustrated at the way Emotiva is handling their software development..this really is basic stuff (I worked in this space for 20+ yrs). Develop in DEV, Test in QA, Roll out to Production. This type of failure should have been caught in DEV and never made it to QA. Sigh... Thanks for the compliment! This issue with All Stereo is not new. It's been with us for quite a while now, and I've reported it before. Here is what I found in a test and posted last July in this thread. With All Stereo, the Front Left trace shows a difference of 19.5dB!!!! So they reduced the problem by a little more than -6dB. Still a long way to go to fix this.  edit: Also it's worth noting that you can see the difference in BM with DD Surround in the firmware used back in July vs what I posted yesterday for Surround with FW2.5. There is easily a -4dB reduction in the BMbug with FW2.5. |
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Post by cawgijoe on Feb 2, 2022 11:31:37 GMT -5
Not to be a jerk, but if ttocs is right (and I'm pretty confident he is, his work is excellent), where is the testing before a firmware release? This was a small release....how hard is it to test in all sound modes. I'm pretty frustrated at the way Emotiva is handling their software development..this really is basic stuff (I worked in this space for 20+ yrs). Develop in DEV, Test in QA, Roll out to Production. This type of failure should have been caught in DEV and never made it to QA. Sigh... Thanks for the compliment! This issue with All Stereo is not new. It's been with us for quite a while now, and I've reported it before. Here is what I found in a test and posted last July in this thread. With All Stereo, the Front Left trace shows a difference of 19.5dB!!!! So they reduced the problem by a little more than -6dB. Still a long way to go to fix this. edit: Also it's worth noting that you can see the difference in BM with DD Surround in the firmware used back in July vs what I posted yesterday for Surround with FW2.5. There is easily a -4dB reduction in the BMbug with FW2.5. Thanks for doing this work, ttocs. I don't use "All Stereo", so I don't run into this issue, but if it's being offered, it needs fixing. |
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Post by ElectricKoolAid on Feb 2, 2022 15:42:46 GMT -5
I updated to 2.5 on my lunch break and so far it definitely seems like the bass is cut down. I was running a 4 db Harman curve with Dirac due to the bloated bass, which I'll probably bump back up to 6 or 8 dB depending on the film or music I'm listening to. But I mostly run upmixing on 2 channel content and anything that's less than 7.1 gets upmixed for films. So yeah, seems like the changes have made some improvements! Now hopefully there are no issues I encounter in my normal usage...
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Post by p4t on Feb 3, 2022 1:19:53 GMT -5
FW2.5 Dirac 3.2.2 EQ BMbug tests Well, this is looking really good because it's pretty much just like when using User EQ, whereas with previous firmware measurements with a Dirac EQ were kinda dangerous to woofers with some setups. Using subwoofers for BM, everything is really simple. One subwoofer channel used has a +2dB tilt in the bass @40hz vs 650Hz. Two subwoofer channels used increases BM +2dB vs using only one sub channel. These results are the same as using User EQ. This is very consistent and repeatable. Doesn't matter if Fronts are Large or Small, same results. When using Large Fronts for BM, the BM @40hz is 3.5dB higher than just the Left Front by itself, this is due to both Large Fronts summing and not being reduced like they should. Further, the BM is 4.5dB higher @40hz vs @650hz. This still needs to be addressed. There's not much else to say because most of this issue is fixed IMO. If one wants to get the BM exact and has good bass response without any boost needed, then lower one sub channel by a dB or so, and if using two sub channels for BM then lower each sub channel by a dB or so. But this is now something that will not be noticed by anyone who is not measuring to find out what's going on. All of this so far is only using Surround sound field. I haven't checked All Stereo which used to be really nutzoid adding as much as 18-22dB. I'll do that another day. Right now I'm going to enjoy some music. Thank you TTOCS for all the things you have done. |
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Post by ttocs on Feb 3, 2022 9:10:42 GMT -5
All Stereo For the All Stereo Mode BMbug I thought it would be good to show both plots together, one from July 2021, and the other from February 2022 with FW2.5. Firmware 2.5 has improved upon the problem, but only by about 1/3. 07/2021 Measuring from a stable portion of the dashed line for the Small Left Front below and above the XO shows about +19dB of elevated BM (I measured at 50Hz & 1kHz). If audio has LFE then the LFE would be playing at +25dB above the baseline of audio above the XO for Small channels! 02/2022 The same XO setting of 200Hz is used in both these plots. On this one it's the Red trace for SL to look at, which has about +12dB elevated BM. Above 500Hz it's at 67dB, and at 40Hz it's at 79Hz. Should any content have LFE, then add an additional +9dB for a grand total of +21dB above the baseline for audio above the XO of Small channels. This is still more than dangerous to a subwoofer playing the audio at a moderate volume. The strange thing is that, with FW2.5, the BM has been reduced by about -7dB since July, but LFE has only come down -4dB. So to me, it seems that the relationship between BM and LFE is pretty close to the 10dB difference "it" should be, but this is not accounting for the relationship between BM and the frequencies above the XO for a Small channel. The last piece of this puzzle is how low the >XO (above XO) are dropped (and I don't know why they "seem" to be dropped vs when using Surround mode for the same channel), but even this has improved by not being dropped as low as before. Every element here has improved, albeit shuffled around a bit, but improved none the less.  |
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Post by geebo on Feb 3, 2022 10:35:16 GMT -5
All Stereo . For the All Stereo Mode BMbug I thought it would be good to show both plots together, one from July 2021, and the other from February 2022 with FW2.5. Firmware 2.5 has improved upon the problem, but only by about 1/3. 07/2021 Measuring from a stable portion of the dashed line for the Small Left Front below and above the XO shows about +19dB of elevated BM (I measured at 50Hz & 1kHz). If audio has LFE then the LFE would be playing at +25dB above the baseline of audio above the XO for Small channels! 02/2022 The same XO setting of 200Hz is used in both these plots. On this one it's the Red trace for SL to look at, which has about +12dB elevated BM. Above 500Hz it's at 67dB, and at 40Hz it's at 79Hz. Should any content have LFE, then add an additional +9dB for a grand total of +21dB above the baseline for audio above the XO of Small channels. This is still more than dangerous to a subwoofer playing the audio at a moderate volume. The strange thing is that, with FW2.5, the BM has been reduced by about -7dB since July, but LFE has only come down -4dB. So to me, it seems that the relationship between BM and LFE is pretty close to the 10dB difference "it" should be, but this is not accounting for the relationship between BM and the frequencies above the XO for a Small channel. The last piece of this puzzle is how low the >XO (above XO) are dropped (and I don't know why they "seem" to be dropped vs when using Surround mode for the same channel), but even this has improved by not being dropped as low as before. Every element here has improved, albeit shuffled around a bit, but improved none the less. Thanks, ttocs. I had not tried All Stereo because frankly, I never use it. But I just tried and can confirm that the bass is still exaggerated in All Stereo. All other modes sound great, however. |
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Post by ttocs on Feb 3, 2022 10:44:04 GMT -5
Thanks, ttocs. I had not tried All Stereo because frankly, I never use it. But I just tried and can confirm that the bass is still exaggerated in All Stereo. All other modes sound great, however. Thanks for the confirmation. Because my room is a "great room", multipurpose living, dining, kitchen, the speakers are all around, so this allows for All Stereo to be used when I just want background music, or, general tv audio everywhere when working in the kitchen, or just anywhere really. With firmware earlier than last summer, don't recall when All Stereo got broken, I was able to use it with no problems. |
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Post by ElectricKoolAid on Feb 3, 2022 14:37:26 GMT -5
Your example shows to me how crazy it is that this issue wasn't the #1 priority bug fix and addressed in much more timely manner...luckily my subs are pretty tough (Harbottle Audio M24's - 24 inch subs and can handle a heck of a lot of power) but I would have been...less than happy if this bug caused me to blow them, or even my speakers which are no slouches either but cost me a pretty penny (PSA MTM-210's). Even with my subs being able to handle gobs of power I don't know if that would matter if the signal was that hot and was clipping somewhere.
I would not have had the funds right now to replace them if something happened and would definitely have had a much less friendly tone in my complaints about this.
Thanks again ttocs for your testing on this. I will say since I loaded 2.5 yesterday the bass definitely seems to be more subdued in the listening modes I use, so there has at least be some progress.
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Post by hsamwel on Feb 3, 2022 18:52:10 GMT -5
Thanks, ttocs. I had not tried All Stereo because frankly, I never use it. But I just tried and can confirm that the bass is still exaggerated in All Stereo. All other modes sound great, however. Thanks for the confirmation. Because my room is a "great room", multipurpose living, dining, kitchen, the speakers are all around, so this allows for All Stereo to be used when I just want background music, or, general tv audio everywhere when working in the kitchen, or just anywhere really. With firmware earlier than last summer, don't recall when All Stereo got broken, I was able to use it with no problems. All stereo has been ”broken” since I got my RMC-1.. First firmware for me was 1.3a. What I mean with broken is that it has always had too much bass.. Almost all of Emotivas upmixing modes have always had more bass than they should have.. More or less.. It’s just lately (2.x) that it has gotten silly with some settings.. When these things are mentioned they just brush it aside with ”we haven’t noticed” or ”no other user has complained”.. Neither of these answers is good enough if customer satisfaction is the primary goal. Why not ”Thanks for the info, we will check this out and come back to you”  Just because an issue isn’t a problem for most users doesn’t mean it shouldn’t be fixed. IMO any error in audio output or calculation should be fixed ASAP. General bugs can be prioritized depending on how severe they are.. |
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Post by ttocs on Feb 3, 2022 19:44:31 GMT -5
Thanks for the confirmation. Because my room is a "great room", multipurpose living, dining, kitchen, the speakers are all around, so this allows for All Stereo to be used when I just want background music, or, general tv audio everywhere when working in the kitchen, or just anywhere really. With firmware earlier than last summer, don't recall when All Stereo got broken, I was able to use it with no problems. All stereo has been ”broken” since I got my RMC-1.. First firmware for me was 1.3a. What I mean with broken is that it has always had too much bass.. Almost all of Emotivas upmixing modes have always had more bass than they should have.. More or less.. It’s just lately (2.x) that it has gotten silly with some settings.. When these things are mentioned they just brush it aside with ”we haven’t noticed” or ”no other user has complained”.. Neither of these answers is good enough if customer satisfaction is the primary goal. Why not ”Thanks for the info, we will check this out and come back to you” Just because an issue isn’t a problem for most users doesn’t mean it shouldn’t be fixed. IMO any error in audio output or calculation should be fixed ASAP. General bugs can be prioritized depending on how severe they are.. BM has not worked as it should since I've had my XMC-2, exactly two years since I received mine. It's always had a few dB of excess BM. Nobody believed us back then. But, I think it was with 2.3 that it went way whacky with super excess BM, which is when all the elevated BM stuff was on steroids. And I was distracted with trying to find which setups were worse than others and consequently don't really know when I noticed for the first time that All Stereo was out of control. I know I have docs on this but am not really interested in taking the time to look for them right now. With 2.5 things are different. They're better. But I don't get a sense of if Emotiva knows which things are better, and then to what degree. BM is fixed for single subwoofer output usage IMO. I'll give them 2dB because I can't say that my room isn't contributing some of that 2dB, so at most it's 1dB high which is a rounding error in this context (my room, my system, my methods). But adding sub outputs is not fixed. When a second sub output is engaged there is +2dB more BM. With my setup I'm using the same subwoofer and just feeding the second sub output into a miniDSP and out to this subwoofer. Left Sub Mono Out to miniDSP-1 Input-1
Center Sub Mono Out to miniDSP-1 Input-2
miniDSP output to subwooferSo all that's happening is the subwoofer is getting more output from the XMC-2. No additional subwoofer is being used, just more channels. I'm hoping that the BIG firmware release that has been dangled out there by the Emo folks has more of what is in 2.5 but more polished and documented as fixed bugs, so we don't have to discover things as we go. |
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Post by hsamwel on Feb 3, 2022 20:17:32 GMT -5
All stereo has been ”broken” since I got my RMC-1.. First firmware for me was 1.3a. What I mean with broken is that it has always had too much bass.. Almost all of Emotivas upmixing modes have always had more bass than they should have.. More or less.. It’s just lately (2.x) that it has gotten silly with some settings.. When these things are mentioned they just brush it aside with ”we haven’t noticed” or ”no other user has complained”.. Neither of these answers is good enough if customer satisfaction is the primary goal. Why not ”Thanks for the info, we will check this out and come back to you” Just because an issue isn’t a problem for most users doesn’t mean it shouldn’t be fixed. IMO any error in audio output or calculation should be fixed ASAP. General bugs can be prioritized depending on how severe they are.. With 2.5 things are different. They're better. But I don't get a sense of if Emotiva knows which things are better, and then to what degree. I'm hoping that the BIG firmware release that has been dangled out there by the Emo folks has more of what is in 2.5 but more polished and documented as fixed bugs, so we don't have to discover things as we go. ”Which things are better” .. Is there a choice? IMO it’s only correct levels or broken output. Or am I misunderstanding you?! Actually don’t know what they are doing at Emotiva.. This isn’t the first major sound issue that they let out without noticing it themselves. Some issues are there for several years. Don’t they do any feature controls? Especially BM, LFE and crossovers which needs to be correct. Upmixing also seems to be a problem for Emotiva.. Calculating the bass from (the same) multiple speakers with All stereo leads to excessive bass levels.. Always has! No one at Emotiva has been bothered to test it. Keith has spoken several times about how great these processors sound and how neutral sounding they are.. How can we trust that any levels of anything in these processors are correct? How many times have people complained about sound levels changing and speakers levels not being the same after firmware update? |
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Post by ttocs on Feb 3, 2022 20:51:17 GMT -5
”Which things are better” .. Is there a choice? IMO it’s only correct levels or broken output. Or am I misunderstanding you?! Please see my posts from the last couple days. Single Subwoofer Elevated BM in Surround modes is now normal. It's been reduced by -4dB minimum and more reduction in some setups. It is now consistent across the board. LFE and BM separation now track together so if someone wants to reduce BM, LFE will reduce also but stay +10dB to BM. Dirac EQ no longer adds massively and inconsistently to the problem, instead it is identical to User EQ. These things are not only better, they are fixed as stated in other posts. Not fixed, but better. Multi sub output summing is still not fixed, but is better, is usable, and probably won't be noticed by many (I'm not in the "many" group, I don't need more bass). Large Channel BM is muuuuch better, also not affected differently by Dirac EQ, better, but not fixed either. Better, but still horrible. All Stereo. I believe -7dB reduction is only just a side effect of what has changed in 2.5 and not specifically attempted to have been improved. Simply a coincidence. Needs another -12dB reduction. Loudness is also better, but still too much bass. I'm pleased when progress has been made. |
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Post by JKCashin on Feb 4, 2022 13:11:52 GMT -5
Maybe I've been misreading things but I just tried all stereo on version 2.5 and I don't really see any elevated bass. Does this only affect certain configurations?
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Post by ttocs on Feb 4, 2022 13:19:30 GMT -5
Maybe I've been misreading things but I just tried all stereo on version 2.5 and I don't really see any elevated bass. Does this only affect certain configurations? I don't know. I'll check different configs. My normal config is 7.1.4, with Left Sub Mono, Center Sub LFE, Large Fronts, all other channels Small. What is your configuration? |
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Post by markc on Feb 4, 2022 16:49:43 GMT -5
Thanks, ttocs. I had not tried All Stereo because frankly, I never use it. But I just tried and can confirm that the bass is still exaggerated in All Stereo. All other modes sound great, however. Thanks for the confirmation. Because my room is a "great room", multipurpose living, dining, kitchen, the speakers are all around, so this allows for All Stereo to be used when I just want background music, or, general tv audio everywhere when working in the kitchen, or just anywhere really. With firmware earlier than last summer, don't recall when All Stereo got broken, I was able to use it with no problems. All stereo would need some simple but variable (depending on how many small speakers you have) mathematics to vary the attenuation of the LFE and surround channels forming the subwoofer feed, depending on HOW MANY speakers are playing at the time. Presumable this happens automatically in 5.1 surround, 7.1 surround, 9.1, 5.4.1 etc If you have a 5.1 system playing all stereo, then the extracted bass and the residual higher frequency audio from all those five channels needs to be attenuated prior to summing to prevent clipping in the channel, and that is even before the LFE is added in. The subwoofer channel will eventually have to carry extracted bass from 5 speakers plus the LFE, so every one of the 5 satellite speaker feeds, the extracted bass from each of the 5 satellites and the LFE each need to be attenuated by around 7dB (-3db needed to combine bass from two audio channels without clipping, -6dB to combine 4 audio channels without clipping, -9dB to combine 8 channels, -12dB to combine 16 channels.) If you have a 7.4.1 system, with 11 small speakers, then the subwoofer channel now needs to contain extracted bass from 11 channels PLUS the LFE channel, all without clipping, meaning every single surround channel needs to be attenuated by around 10dB before the LPF extracts the bass below the crossover and the LFE also needs to be attenuated by ~10dB, before the LFE and 9xextracted bass are summed to an unclipped channel. I think the G3P are doing the maths incorrectly. Either not attenuating the extracted bass or the LFE or the surround channel audio above the crossover by the same and correct amount. To be honest, I think that this is occurring not only in All-Stereo mode, but also in 4.1, 5.1, 7.1, 7.2.1 etc etc. More than one subwoofer further complicates it because this doubles the capacity of the subwoofer signal capacity, so that the satellite feed, the extracted bass and the LFE need 3dB less attenuation that in a system with one subwoofer. (no attenuation needed to combine bass from two audio channels into two subwoofers, -3dB to combine bass from 4 audio channels into two subwoofers without clipping, -6dB to combine 8 channels, -9dB to combine 16 channels.) |
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Post by hsamwel on Feb 4, 2022 19:13:27 GMT -5
Thanks for the confirmation. Because my room is a "great room", multipurpose living, dining, kitchen, the speakers are all around, so this allows for All Stereo to be used when I just want background music, or, general tv audio everywhere when working in the kitchen, or just anywhere really. With firmware earlier than last summer, don't recall when All Stereo got broken, I was able to use it with no problems. All stereo would need some simple but variable (depending on how many small speakers you have) mathematics to vary the attenuation of the LFE and surround channels forming the subwoofer feed, depending on HOW MANY speakers are playing at the time. Presumable this happens automatically in 5.1 surround, 7.1 surround, 9.1, 5.4.1 etc If you have a 5.1 system playing all stereo, then the extracted bass and the residual higher frequency audio from all those five channels needs to be attenuated prior to summing to prevent clipping in the channel, and that is even before the LFE is added in. The subwoofer channel will eventually have to carry extracted bass from 5 speakers plus the LFE, so every one of the 5 satellite speaker feeds, the extracted bass from each of the 5 satellites and the LFE each need to be attenuated by around 7dB (-3db needed to combine bass from two audio channels without clipping, -6dB to combine 4 audio channels without clipping, -9dB to combine 8 channels, -12dB to combine 16 channels.) If you have a 7.4.1 system, with 11 small speakers, then the subwoofer channel now needs to contain extracted bass from 11 channels PLUS the LFE channel, all without clipping, meaning every single surround channel needs to be attenuated by around 10dB before the LPF extracts the bass below the crossover and the LFE also needs to be attenuated by ~10dB, before the LFE and 9xextracted bass are summed to an unclipped channel. I think the G3P are doing the maths incorrectly. Either not attenuating the extracted bass or the LFE or the surround channel audio above the crossover by the same and correct amount. To be honest, I think that this is occurring not only in All-Stereo mode, but also in 4.1, 5.1, 7.1, 7.2.1 etc etc. More than one subwoofer further complicates it because this doubles the capacity of the subwoofer signal capacity, so that the satellite feed, the extracted bass and the LFE need 3dB less attenuation that in a system with one subwoofer. (no attenuation needed to combine bass from two audio channels into two subwoofers, -3dB to combine bass from 4 audio channels into two subwoofers without clipping, -6dB to combine 8 channels, -9dB to combine 16 channels.) All stereo don’t need to calculate LFE atleast. It has only 2.0 as its source to begin with. BM is all it needs to do. But I guess Neural:X and DSU also has incorrectly calculated bass depending on setup? But it doesn’t help if Emotiva don’t attenuate correctly depending on speaker setup. My guess is they use one formula based on a 5.1 setup. This way most of us with bigger systems get elevated bass.. ttocs Maybe you could test this? How does All stereo behave depending on number of speakers used? |
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Post by ttocs on Feb 4, 2022 23:20:16 GMT -5
EDIT 02/06/2022
This post is not correct. Leaving it for context. See first post on 02/06/2022 below.FW2.5 All Stereo A single subwoofer channel is used for simplicity and so no summing issues can be introduced. I'm wrong again, well partially. I didn't consider something in how to measure while in All Stereo. When measuring a channel with REW while using All Stereo, if that channel happens to be one of the Left Side channels, then all Left channels are operating, which I already knew. But, it would seem that the subwoofer is still handling BM for all channels, at least that's what I'm assuming right now. So if this is the case, then a method needs to be used for "doubling" the Left channels to account for the missing Right channels. REW to the rescue using Arithmetic. I simply used the arithmetic feature for one trace. REW calculates and duplicated the trace calling it A+B. From what I can figure using other measurements with various speaker counts, it seems to be accurate enough for me. After the new trace is in place, I look at the level at 650Hz on the A+B trace, and 40Hz on the base trace, then figure the difference in level. The plot from last July still has 15dB elevated BM in All Stereo using this new method. But the plot from this week with FW2.5 has only a 2.5dB rise in BM using this method. See the two plots below. So it's fixed Right? No. This week's plot is using 7.1.4, but things get a bit weird with lower speaker counts.   The plot below is just of the Left Front setup as Small. The processor speaker counts represented are 7.1.4 down to 3.1, as can be seen in the legend. Note that the BM never changes. Weird. As the speaker count goes down, the speaker level also goes down, just as I would expect, but the BM stays at the same level. This seems counterintuitive to me. This would suggest that lower speaker count systems would exhibit more apparent bass. Any ideas?  I hadn't listened to All Stereo these last couple days until after measuring tonight. In fact, I haven't used All Stereo for more than a year when I noticed the excess bass. But, tonight I found that I could use All Stereo when the system is setup as 7.1.4, but it's still not as good as it used to be, at least using the processor as intended. Left up to me I circumvent the processor BM issues and tweak so it sounds how I want. My ATMOS speakers are spec'd for going down to 70Hz, but that's optimistic. I find that they need to be crossed at 140-150Hz for best performance, and my subs do well for this. My surrounds can go lower, but I still find that crossing these at 120Hz is best. The crossover setting makes a big difference with respect to being able to discern a problem with BM. The higher the crossover setting, the more BM problems will show up. Just one reason why some do, and some don't have issues with the BMbug. So I lowered the XO for all channels down to 80Hz so the system is "normal". Then I started Pandora on "The Art Of Noise" channel so it's all soothing, bass heavy music, mostly. Then I began listening with various system setups. 7.1.4 had some excess bass in All Stereo, but not as bad as over a year ago, definitely doable. 7.1 had more bass, or more accurately, less speaker sound, same amount of bass. 3.1 sounds very muffled, all bass, not much treble. Sounds like my car radio sounded when I got it back from service and one of the guys must've changed my bass/treble settings so the bass was turned all the way up. So this needs fixing in a big way.
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Post by JKCashin on Feb 4, 2022 23:49:27 GMT -5
Maybe I've been misreading things but I just tried all stereo on version 2.5 and I don't really see any elevated bass. Does this only affect certain configurations? I don't know. I'll check different configs. My normal config is 7.1.4, with Left Sub Mono, Center Sub LFE, Large Fronts, all other channels Small. What is your configuration? I really don't want to put you through any trouble.... more an observation on my part... 7..1.2 here Center Sub Mono, all small |
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Post by ttocs on Feb 5, 2022 9:44:52 GMT -5
I don't know. I'll check different configs. My normal config is 7.1.4, with Left Sub Mono, Center Sub LFE, Large Fronts, all other channels Small. What is your configuration? I really don't want to put you through any trouble.... more an observation on my part... 7..1.2 here Center Sub Mono, all small In the post just above yours I found that the more speakers in a system, the less the All Stereo Excess BM will be of concern. If you want to try something that's pretty non-invasive, just set most of your channels to None except for Left, Center, and Right, lower the volume, then play some music. Leave the volume where it is, then re-enable all the channels and listen again. |
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