Xmall
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- Joined
- Aug 7, 2024
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Hello Audio science forums,
This is my first post - I've recently started dabbling in frequency response measurement and I was hoping for some pointers or maybe someone to point me to Frequency response measurement for dummies
Long story short, I recently repaired a Sony SS-NX1 speaker (I assume its fairly low end, but I'm upgrading from a Klipsch Quintet) and I was interested to have a look at the frequency response between the original and repaired speaker - and between my old speakers and new.
Picture of my room and recording setup (currently at the listening position - but I've also recorded either speaker directly) here:
I should note I'm very much a newbie - have a fragmented understanding of a few areas like frequency response, crossover types, room modes etc - but I might be making some very basic and fundamental errors.
My current recording setup is:
Room: Living room - for listening only. Large room, lots of furniture - very irregular space.
AMP: Denon AVR-1713 (Testing both with the room EQ (Audessey) and without)
Device: Android phone
Recording App: AudioTool with calibration files loaded - using the 'Peak Response' function to record a log frequecny sweep.
Mic: Dayton Audio IMM-6C - Calibrated mic: https://www.daytonaudio.com/product/1974/imm-6c-idevice-usb-c-calibrated-microphone
PC Software: Room EQ Wizard (REW).
Sweep generator: Online sweep generator, set to sine wave generator, logarithmic scale: https://onlinetonegenerator.com/frequency-sweep-generator.html
I've been exporting just the Hz and Db from Audiotools into REW (though i also seem to have 'voltage' measurements from the microphone - not sure if these are important).
Getting some results - a couple of samples from the listening position below (Psychoacoustic smoothing applied):
Blue trace is the Sony Speakers in Stereo, no room Equalisation.
Purple my little Klipsch Quintet in Stereo, no room Equalisation.
One thing I am quite confused about - is the significant decay in volume I'm setting in the upper frequencies when looking at the REW plot. When i look at AudioTools - it appears to indicate a much flatter response (At least upto 4K):
(This should match the blue curve above)
I thought maybe it was a scale issue - but looking the humps at 500hz and 4k REW seems to be presenting a significant reduction compared to Audiotools.
So some key questions for me are:
1) With this kind of setup, can I expect any kind of accuracy (I'm only really after sufficient for comparison)?
2) Is the 'voltage' measurement in the AudioTools file of any use in REW?
3) Can anyone comment on why REW seems to be showing a different response to Audio tools?
4) Any other tips would be very much welcome.
Thanks in advance
LJ
This is my first post - I've recently started dabbling in frequency response measurement and I was hoping for some pointers or maybe someone to point me to Frequency response measurement for dummies
Long story short, I recently repaired a Sony SS-NX1 speaker (I assume its fairly low end, but I'm upgrading from a Klipsch Quintet) and I was interested to have a look at the frequency response between the original and repaired speaker - and between my old speakers and new.
Picture of my room and recording setup (currently at the listening position - but I've also recorded either speaker directly) here:
I should note I'm very much a newbie - have a fragmented understanding of a few areas like frequency response, crossover types, room modes etc - but I might be making some very basic and fundamental errors.
My current recording setup is:
Room: Living room - for listening only. Large room, lots of furniture - very irregular space.
AMP: Denon AVR-1713 (Testing both with the room EQ (Audessey) and without)
Device: Android phone
Recording App: AudioTool with calibration files loaded - using the 'Peak Response' function to record a log frequecny sweep.
Mic: Dayton Audio IMM-6C - Calibrated mic: https://www.daytonaudio.com/product/1974/imm-6c-idevice-usb-c-calibrated-microphone
PC Software: Room EQ Wizard (REW).
Sweep generator: Online sweep generator, set to sine wave generator, logarithmic scale: https://onlinetonegenerator.com/frequency-sweep-generator.html
I've been exporting just the Hz and Db from Audiotools into REW (though i also seem to have 'voltage' measurements from the microphone - not sure if these are important).
Getting some results - a couple of samples from the listening position below (Psychoacoustic smoothing applied):
Blue trace is the Sony Speakers in Stereo, no room Equalisation.
Purple my little Klipsch Quintet in Stereo, no room Equalisation.
One thing I am quite confused about - is the significant decay in volume I'm setting in the upper frequencies when looking at the REW plot. When i look at AudioTools - it appears to indicate a much flatter response (At least upto 4K):
(This should match the blue curve above)
I thought maybe it was a scale issue - but looking the humps at 500hz and 4k REW seems to be presenting a significant reduction compared to Audiotools.
So some key questions for me are:
1) With this kind of setup, can I expect any kind of accuracy (I'm only really after sufficient for comparison)?
2) Is the 'voltage' measurement in the AudioTools file of any use in REW?
3) Can anyone comment on why REW seems to be showing a different response to Audio tools?
4) Any other tips would be very much welcome.
Thanks in advance
LJ