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#1
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Is there an 'adaptive' EQ plugin available, or what do you call them?
Hello,
What do you call those EQ units that can be used to correct or 'level' a speaker's frequency reproduction? I mean the ones where you stick a measurement mic in and play a test sound array and it makes corrections based on that. Room correction? And...is there a VST or DX plugin that does that with some measurement plugins? Cheers, Dee |
#2
Posted to rec.audio.pro
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Is there an 'adaptive' EQ plugin available, or what do you callthem?
DeeAa wrote:
What do you call those EQ units that can be used to correct or 'level' a speaker's frequency reproduction? I suppose you'd call it an automatic equalizer. I mean the ones where you stick a measurement mic in and play a test sound array and it makes corrections based on that. Room correction? These days, you find this sort of gadget built into speakers. It doesn't actually correct the room, but sometimes they can help to some extent. You correct the room with a hammer. And...is there a VST or DX plugin that does that with some measurement plugins? iK Multimedia has a plug-in room correction system. It's kind of expensive and reports (from other than 1K Multimedia) are that it doesn't sound very good. It isn't a permanent lives-in-line kind of tool, it corrects the monitor output of your DAW so that you mix while listening to the "corrected" room. -- If you e-mail me and it bounces, use your secret decoder ring and reach me he double-m-eleven-double-zero at yahoo -- I'm really Mike Rivers ) |
#3
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Is there an 'adaptive' EQ plugin available, or what do you call them?
DeeAa wrote:
What do you call those EQ units that can be used to correct or 'level' a speaker's frequency reproduction? Fraudulent. I mean the ones where you stick a measurement mic in and play a test sound array and it makes corrections based on that. Room correction? Room correction and speaker correction are different things. Both are more or less misguided in different ways. And...is there a VST or DX plugin that does that with some measurement plugins? Yes, everybody and his brother is coming out with these things right now... last year there were probably a dozen of them at the AES show on display. All the demos I heard made the system sound worse in some way, except for a couple systems (like the JBL) that did only moderate cutting below 200 Hz and made no attempt to boost anything. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#5
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Is there an 'adaptive' EQ plugin available, or what do you call them?
Randy Yates wrote:
(Scott Dorsey) writes: DeeAa wrote: What do you call those EQ units that can be used to correct or 'level' a speaker's frequency reproduction? Fraudulent. Are you claiming it's not possible to equalize a speaker's on-axis response? That is, for the most part, false. No, but it's not _useful_ to equalize a speaker's on-axis response, because the off-axis response contributes greatly to what the listener hears. On top of this, most of the problems that you hear on-axis are things like horn resonances... and you can equalize the response so that a sweep test looks good, but the impulse response will still be screwy because it's not the right solution for the problem. I mean the ones where you stick a measurement mic in and play a test sound array and it makes corrections based on that. Room correction? Room correction and speaker correction are different things. Both are more or less misguided in different ways. I can see why you might make such a statement regarding room correction since this type of processing is listener position dependent, but why would you make it for speaker correction? Because most speaker problems aren't on-axis issues... most of the frequency response problems with speakers are due to narrowband cabinet, driver, or horn resonances. We've come to the point finally after a century of research where we _can_ actually build something flat on-axis without too much work. The problem is that this is only a tiny part of the problem of making something sound good. Also a _lot_ of the response issues you hear in speakers today are due to crossover issues.... since the drivers aren't in the same location in space, the crossover has to be configured so that the response is flat at only one angle. The closer you can get the drivers together, the easier that problem is to solve. Equalization _can_ solve it for one angle (really, equalization is what crossovers are all about), but you don't always listen at that one angle. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#6
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Is there an 'adaptive' EQ plugin available, or what do you call them?
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#7
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Is there an 'adaptive' EQ plugin available, or what do you call them?
On Tue, 10 Feb 2009 11:08:43 -0600, Frank Stearns
wrote: (Scott Dorsey) writes: Randy Yates wrote: (Scott Dorsey) writes: DeeAa wrote: What do you call those EQ units that can be used to correct or 'level' a speaker's frequency reproduction? Fraudulent. Are you claiming it's not possible to equalize a speaker's on-axis response? That is, for the most part, false. No, but it's not _useful_ to equalize a speaker's on-axis response, because the off-axis response contributes greatly to what the listener hears. On top of this, most of the problems that you hear on-axis are things like horn resonances... and you can equalize the response so that a sweep test looks good, but the impulse response will still be screwy because it's not the right solution for the problem. I mean the ones where you stick a measurement mic in and play a test sound array and it makes corrections based on that. Room correction? Room correction and speaker correction are different things. Both are more or less misguided in different ways. I can see why you might make such a statement regarding room correction since this type of processing is listener position dependent, but why would you make it for speaker correction? Because most speaker problems aren't on-axis issues... most of the frequency response problems with speakers are due to narrowband cabinet, driver, or horn resonances. We've come to the point finally after a century of research where we _can_ actually build something flat on-axis without too much work. The problem is that this is only a tiny part of the problem of making something sound good. Also a _lot_ of the response issues you hear in speakers today are due to crossover issues.... since the drivers aren't in the same location in space, the crossover has to be configured so that the response is flat at only one angle. The closer you can get the drivers together, the easier that problem is to solve. Equalization _can_ solve it for one angle (really, equalization is what crossovers are all about), but you don't always listen at that one angle. And let's not forget extremely uneven decay times across the audio spectrum in most typical rooms, particularly below, say, 300 Hz. EQ really won't address this in any meaningful way, as Scott says. It's tough (impossible?) to undo the timing kinks of a room that might have an RT30 of 200 mSec in one place and 3.5 Sec bubble a 1/4 octave up. One of the things in our room that took some sweat (and hammering, as Mike says), was getting very even and short decay ( 150 mS) below 1K, and then a smooth and intentional rise to around 1.2 second 10K. I continue to smile at the jaw-drops I get from several different engineer friends when they hear their stuff in this room, including a mastering engineer who shook his head in pleasant disbelief. YMMV. Frank Stearns Mobile Audio Could you post an impulse? I'd like to see that. d |
#8
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Is there an 'adaptive' EQ plugin available, or what do you callthem?
Thanks guys, the info was very good!
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