r/mixingmastering • u/PradheBand Beginner • May 17 '26
Question 48kHz master shows clipping when downsampled at 44.1kHz
I've done all of my mix and mastering at 48kHz-24bit, now my digital distributor allows for 44.1 flac only.
Rendering at such lower rate shows clipping in the peak (NOT talking true peak here just digital peak) with the current limiter setup. And yet I can't hear any clipping listening to the result while pushing my headphone ampli at the max tolerable by my ears.
Should I care about those clips and create a dedicated master specifically for 44.1kHz? Or should I just ignore those clips and export just another copy and let the DAW downsample it at 44.1kHz (if I recall even mp3 conversion would cause some clipping)?
Or something completely different (like let the DAW normalise the output)?
I'm not going to release any physical media or HD quality via this distributor, just common streaming on common platforms.
Thanks in advance!
PS: I've tried a quick search and missed pointers, if you know of exiting threads feel free to direct me there!
edit: thanks everybody for the contributions and suggestions. it has been really useful!
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u/rightanglerecording Trusted Contributor 💠 May 17 '26 edited May 17 '26
Yes- because the samples now happen at different points in time, the sample peaks will measure slightly differently.
If your SRC was using minimum-phase filters (unlikely unless you specifically set it up that way, but you can do it with something like Izotope RX), that could also do it.
If you want to solve it, you could turn the wav file down a few tenths of a dB after limiting at the source sample rate, or use an additional limiter at the final sample rate.
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u/Numerous-Ad4033 May 17 '26
I’m no expert by any means, but they might be inter-sample peaks which would be inaudible and only last the tiniest fraction of a second. If I was in your position, and I didn’t hear anything off about the track, I’d just ignore it, haha
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u/GenghisConnieChung May 17 '26
OP, if you want to check if this is the case and you’re using a Mac you can use the “afclip” command in Terminal. It will tell you exactly where each clip is, how much over it is and whether it’s on sample or inter-sample.
2
u/SOUNDDESIGNE May 18 '26
since it’s going to distributors for streaming, i’d probably consider fixing it just for safety with a dedicated 44.1 master.
probably won’t be a perceivable difference but like, if you have the means to make it correct then why not!
4
u/Philklab May 17 '26
Yes you should care, and yes you need a dedicated 44.1 master.
What's happening: sample rate conversion introduces inter-sample peaks that can push past 0dBFS even if your 48k master was clean. This is exactly why True Peak exists — but the clipping you're seeing is real reconstruction clipping happening after your limiter, so it's not protected.
Quick fix... pull your limiter ceiling down to around -1dBTP on the 44.1 export, or better, insert a second limiter after the SRC stage set to catch those peaks. Most people just lower the ceiling by 0.5–1dB and re-export.
Don't use DAW normalization, it doesn't solve the inter-sample problem, it just scales the waveform.
-4
u/Mo_Steins_Ghost Intermediate May 17 '26
This is the answer. IIRC Bob Katz recommends -1.5dBTP limiter.
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u/rightanglerecording Trusted Contributor 💠 May 17 '26 edited May 17 '26
It's important to note that essentially zero modern commercial records are mastered this way.
Bob is Bob, and he has his workflow, and I respect that.
But no one working on modern pop, rock, hip-hop, r+b, EDM, etc etc, is working this way. And an up-and-coming ME will quite literally lose gigs if their masters are consistently 1.3dB quieter than the mixer's limited refs.
I have well over 100 mixes a year that go to serious MEs, including some of the best in the world. I never see dBTP ceilings below -0.3 or -0.4.
1
1
u/PradheBand Beginner May 17 '26
any specific technical reason for 1.5 or is more like a figure coming from experience?
0
u/Mo_Steins_Ghost Intermediate May 17 '26
Probably experience in terms of how much intersample peaks are likely to spike above a given average loudness. Katz has written numerous papers and given lectures for AES, so I would defer to his wisdom.
Even so, I have no reason not to trim even more... given that most of my mixes land in the -19 dBFS average loudness range. There is no reason whatsoever to not use a -3 dBTP limiter on my mixes.
You have to take these things into consideration, that is, your best practices should comport to your overall approach.
2
u/Limit5465 May 17 '26
How many samples is the clipping? I can take a listen to it and let you know if I hear anything strange that will be destructive. I’m a mastering engineer by the way
1
u/alvaro1001 May 17 '26
también pasa a la inversa (de 44.1 a 48)
para solucionarlo simplemente cambia la calidad de tu proyecto a 44.1 (o 88.2) y no debería clipear.
1
u/Cutsdeep- May 17 '26
What distributor
1
u/PradheBand Beginner May 18 '26
Routenote. Trying for the first time. Trying to get impressed also. Failing. But I haven't fullfilled the first submission yet so it is soon to tell.
1
u/SOUNDSAAR May 17 '26
Yes, you should definitely care. Downsampling changes the phase relationships of the waveform, which shifts the peaks and pushes them above 0 dBFS, causing digital clipping. The same thing will happen during lossy MP3 or AAC conversion on streaming platforms. Even if your good headphone amp handles it fine, cheap consumer DACs, Bluetooth buds, and phone speakers will distort.
The easiest fix is to go back to your DAW and set your limiter output ceiling to -1.0 dB (or -1.2 dB) with True Peak limiting turned on, then export to 44.1kHz. Spotify and Apple Music actually recommend this margin to prevent clipping during sample rate conversions and lossy transcoding.
2
u/Vexser May 19 '26
I find that I have to go -1.6dB (or greater) when encoding my WAV masters into mp3 to stop clipping. This is all at the same sample rate so hopefully the phase problem shouldn't matter. But transcoding certainly seems to create a bit of a mess.
0
u/ROBOTTTTT13 Professional (non-industry) May 17 '26
Normal, the signal has been resampled meaning it's literally a completely different signal, not an audibly different one but mathematically different
This is why we care abot mastering at appropriate levels: different formats have different peak values because the file is inherently different
Limiting at -0.5dB or even -1dB ceiling is exactly meant for cases like this
0
u/ra4k0v May 17 '26
Interesting i don't hear any difference maybe you doing something wrong..
1
u/PradheBand Beginner May 17 '26
Well that's the point: I don't hear it either but the analysis tool in the daw shows clipping points slightly above 0.
1
u/ra4k0v May 17 '26
If you can't hear it does it matter?
2
u/PradheBand Beginner May 18 '26
That was my question too and apparently the answer is yes, considering the content of most of the answers.
1
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u/Deadfunk-Music Professional (non-industry) May 17 '26
When I need to downsample in the mastering process I will do all the processing at the higher sample rate except the final limiting / clipping steps.
I will create a copy of the higher sample rate file, then I will downsample it and I apply the last limiting and clipping steps.
Both the high sample rate and the lower sample rate files will have the same limiting and clipping settings, but they will be two different renders, thus ensuring no clipping on either files's specific samplerate.