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New speaker DSP in Media Center 14.0.127 [Room Correction]

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)p(:

--- Quote from: Matt on January 16, 2010, 07:16:22 pm ---
A third thing for that list might be convolution-based correction with impulse recordings.  I've never gotten results I consider worthwhile when I've played with this in the past so I'm less eager to hurry into this area.

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I use a vst based convolver (Voxengo Prestine Space) with mc all the time. I really like the results. I think native support for drc would be a pretty popular audiophile feature.

peter

gappie:

--- Quote from: rick.ca on January 16, 2010, 09:23:50 pm ---Thanks, Matt. The question in my mind, of course, is what about other applications that don't have their own correction. I think a good enough answer might be if they don't have it, they can do without it. So if it makes an important difference to a game, for example, hopefully there's appropriate corrections settings within the game. Otherwise, I need to remember to change the setting before and after—a daunting task for my tired old brain. Needless to say, I appreciate MC's ability to configure things differently in separate zones.

Afterthought: I suppose I could launch a game with a batch file that changes the driver settings in the registry for the duration of the game.

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i think that the room correction is only working for audio, not for the files using directX, right matt? so when you want to use it with your movies..

 :)
gab

mojave:

--- Quote from: Matt on January 16, 2010, 10:16:43 am ---Glad you like it.

After thinking about it some more, I think we're going to incorporate volume correction into the speaker distance algorithm.

If we know your left speaker is 10% farther from you than your right speaker, it's pretty simple math to figure out the decibel difference from this.  I think this should be applied automatically when distance correction is in use instead of requiring the user to dial it in with the Level slider. (the level slider will of course still be available)
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This is a bad idea. Volume correction is used for differences in distance, but also for differences in speaker sensitivity. For example, my center speaker has a sensitivity of 90.5 dB@1m and my mains have a sensitivity of 86 dB@1m. At the same distance, I need to attenuate the center speaker by 4.5 dB in order to match my mains.


--- Quote ---Another change I'd like is to add a 'Mute' and 'Solo' button on the Levels section to help with testing.

--- End quote ---

Great idea!

Matt:

--- Quote from: mojave on January 18, 2010, 12:04:00 pm ---This is a bad idea. Volume correction is used for differences in distance, but also for differences in speaker sensitivity. For example, my center speaker has a sensitivity of 90.5 dB@1m and my mains have a sensitivity of 86 dB@1m. At the same distance, I need to attenuate the center speaker by 4.5 dB in order to match my mains.

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You're of course right that speaker sensitivity needs to be accounted for.

But distance provides a good starting point, and as long as the manual adjustment for level remains, I think it makes a nice addition.  It will be in the next build.

It's kind of neat to sit really close to a speaker and listen to how it sounds almost like mono.  Then dial in the distances and the image neatly balances out.

mojave:
In the Speakers DSP there should also be the option for Large or Small for each speaker and a setting for the crossover frequency. When set to Large, each speaker gets the full range audio signal with the option to also route the sound below the crossover frequency to the sub. Each speaker should also have a check box for "Bass to Sub Plus Mains" that is available if Large is selected. If it is set to Small each speaker gets the frequencies above the crossover frequency with the frequencies below the crossover sent to the sub and combined with the LFE signal. The crossover should have a High Pass Filter with a 12dB/octave slope and a Low Pass Filter with a selectable slope (12 dB or 24dB/octave slope). This selection could be made on the Subwoofer settings page and should only be allowed when the mains are run as Large and "Bass to Sub Plus Mains" is selected. Each speaker should also have a check box for "Bass to Sub Plus Mains." Some like their bass routed to the mains in addition to the sub. These settings would allow the Speakers DSP to handle bass management and provide greater flexibility.

The reason for the selectable slope of the subwoofer LPF is because some like to listen to music in a 2.1 configuration. They like their mains to run full range and their subs to add in the low frequencies below the natural frequency rolloff of their mains. Because main speakers of different designs roll off at different rates, having an adjustable rolloff for the sub is helpful for arriving at the best speaker/sub integration.

With my 7.1 channel system, for example, I would set the Output Format DSP to "7.1 channels" and surround mixing to "no mixing (unused channels silent)". I would then set each speaker to small and use a crossover of 80 Hz. Now regardless of how many channels I am listening to, MC should route all bass to my subwoofer channel. If I am listening to two channel music, my speakers should get from 80Hz and up and the sub from 80Hz and down.

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