Frequency transformation supported by EQ?

maddib

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Hi,

I'm rather new to REW EQ, but I already could achieve some major goals when using it.
So, when it comes to EQing a measurement to a specific target curve it ends in some EQ parameters in up to 20 frequency slots. I'd like to know if REW EQ, besides this rather classical EQing, also supports some sort of frequency transformation/adjustment, i.e. sending a specific frequency, measuring it, comparing it to the one sent, and making adjustments to the frequency itself, not only to its loudness. May be it's always done in the background without telling the user.
Sorry, for this newbie question

thanks
 

ddude003

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In REW try Help EQ, Help Generator & Help RTA... If that does not get you what your looking for... Try the Trace Arithmetic, A.k.a. Vector math...
 
Last edited:

maddib

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I read quite a lot, and sure, there may be something I missed. REW is esp. able to measure frequencies with their amplitude rendered by speakers. And the original signals are often sent by some data generated by REW. So, after or while sending these signals to a speaker and measuring the rendered output... does REW somehow detects differences between original and rendered frequencies? Let's say would REW see if an original frequency of e.g. 5,000Hz is rendered as 4,965Hz?
And if REW was able to detect that, would it be able to correct that?
May be I'm totally on the wrong path. But somehow I can't find an answer for this question;)
 

ddude003

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Aug 13, 2017
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925
Location
Somewhere Northeast of Kansas City Missouri
My AV System  
Preamp, Processor or Receiver
PrimaLuna Dialogue Premium TubePre (2 channel+sub)
Main Amp
McIntosh MC152 SS Amp (2 channel)
Additional Amp
Yamaha RX-A850 Pro (the other 5 channels lol)
Computer Audio
MacBook Pro, Custom i7 7700k De-lid 2xAsus1080ti GFX build, Audirvana+, LiquidSonics, SoX
DAC
Chord Electronics Ltd. Qutest
Universal / Blu-ray / CD Player
Sony UBP-X700 /M Ultra HD 4K HDR
Front Speakers
Martin Logan ElectroMotion ESL
Center Channel Speaker
Martin Logan Motion C2
Surround Speakers
Martin Logan Motion 4
Surround Back Speakers
Martin Logan Motion 4 (yes, another set of these)
Subwoofers
Martin Logan Dynamo 700
Other Speakers or Equipment
Cifte 12AU7 NOS & Genalex Gold Lion Tubes in Pre
Video Display Device
Samsung The Premiere LSP7T UST Laser Projector
Screen
Elite Screens Aeon CLR3 0.8 Gain 103-inch
Remote Control
PrimaLuna & Lumin iApp
Streaming Equipment
Netgear Nighthawk S8000 Streaming Switch, Lumin U1 Mini Streamer/Transport
Streaming Subscriptions
Roon & QoBuz Studio Premier, Amazon Prime & Netflix
Other Equipment
ThrowRug, SaddleBlankets, WideBand & BaseTraps...

maddib

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Thanks for your link, but the very few appearances of the words frequencies or frequency don't reveal an answer.
 

sm52

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maddib
you confused yourself. If REW says it sends 10 Hertz, then it sends 10 Hertz and the sound card, amplifier and speaker will play 10 Hertz. Everything else is from the evil one.
 

maddib

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maddib
you confused yourself. If REW says it sends 10 Hertz, then it sends 10 Hertz and the sound card, amplifier and speaker will play 10 Hertz. Everything else is from the evil one.
Well, I'm not a physicist ;). But in each speaker there's moving mechanics, at the very end. And they behave 100% as theory? May be the real deviations are that small that they are actually inaudible?
 

ddude003

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Joined
Aug 13, 2017
Messages
925
Location
Somewhere Northeast of Kansas City Missouri
My AV System  
Preamp, Processor or Receiver
PrimaLuna Dialogue Premium TubePre (2 channel+sub)
Main Amp
McIntosh MC152 SS Amp (2 channel)
Additional Amp
Yamaha RX-A850 Pro (the other 5 channels lol)
Computer Audio
MacBook Pro, Custom i7 7700k De-lid 2xAsus1080ti GFX build, Audirvana+, LiquidSonics, SoX
DAC
Chord Electronics Ltd. Qutest
Universal / Blu-ray / CD Player
Sony UBP-X700 /M Ultra HD 4K HDR
Front Speakers
Martin Logan ElectroMotion ESL
Center Channel Speaker
Martin Logan Motion C2
Surround Speakers
Martin Logan Motion 4
Surround Back Speakers
Martin Logan Motion 4 (yes, another set of these)
Subwoofers
Martin Logan Dynamo 700
Other Speakers or Equipment
Cifte 12AU7 NOS & Genalex Gold Lion Tubes in Pre
Video Display Device
Samsung The Premiere LSP7T UST Laser Projector
Screen
Elite Screens Aeon CLR3 0.8 Gain 103-inch
Remote Control
PrimaLuna & Lumin iApp
Streaming Equipment
Netgear Nighthawk S8000 Streaming Switch, Lumin U1 Mini Streamer/Transport
Streaming Subscriptions
Roon & QoBuz Studio Premier, Amazon Prime & Netflix
Other Equipment
ThrowRug, SaddleBlankets, WideBand & BaseTraps...
In a perfect world REW sends a tone or sweep (range of tones), your system plays those tones and REW records/samples what was played using a microphone... Then you can display what REW records and see how close or how far from perfect your system and room is... You can then use REW to create various EQ filters that you can load into your systems signal chain to "correct" the imperfections... Your signal chain must have a device or software that can use the EQ filters that REW produces...

In theory there is no difference between theory and practice. In practice there is. -Yogi Berra-
 
Last edited:

skid00

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Distortion defines the difference between what is sent, and what is reproduced.

Speaker drivers will produce the same freq they are sent (possibly at a much lower loudness), but may also resonate with harmonic distortions that are multiples of the signal.
 
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