Audio Sampling Rate Tips for Home Studios and Vinyl Pressing Projects

Estimated reading time: 11 minutes

Most of today’s artists are recording digitally, as it is cheaper and more convenient than the old method of recording to tape. When you are recording digitally, you have a multitude of configuration options available — many more than in the past. Decisions have to be made before you play a single note of music, including choosing the sample rate and bit depth for your project. Here’s some information and suggestions about how to pick a sample rate for your project on your digital audio workstation (DAW) ,and the differences between different sample rates.

Table of Contents:
• Understanding audio sampling rates
• Ideal sampling rates for home studio recordings
• Sampling rate tips for different types of home studio projects
• Optimizing sampling rates for vinyl pressing projects
• Technical considerations and challenges
• Practical tips for audio engineers
• Ready to release your album?

Understanding audio sampling rates

To understand audio sampling rates, first let’s fully understand digital audio. Digital audio is a representation of sound that has been converted into binary digits or “bits” that can be stored, processed, and played back on a computer. When you record sound into a DAW, the amplitude of an analog sound wave is captured at a specific interval known as the sample rate. Sound waveforms can’t be entirely captured in the analog-to-digital conversion process; the computer quantizes the information to a set of levels determined by the bit depth, a setting of how much information can be captured.

What is an audio sampling rate?

The audio sampling rate is the number of samples per second that are taken of an analog audio source to create a digital audio file. It’s not very different conceptually from the first moving picture that was created by having 24 cameras with trip wires. A racehorse running through the wires created 24 pictures which simulated motion when flipped through. In the same way, digital audio is comprised of samples which are like snapshots of the audio. The higher the sample rate, the more “snapshots” you capture. The rate is measured in kilohertz (kHz), and the number tells you what the highest possible frequency possible in your digital files is.

Sample rate has little to do with the quality of recorded sound, though higher sample rates have more “headroom,” which can help process certain effects like saturation and compression more effectively. The human ear can only hear up to 20 kHz, so the base sample rate is 44.1 kHz which is twice the rate of human audibility. 44.1 kHz is the minimum sample rate required to reproduce everything in human hearing; this is why this number became the standard rate for many years.

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Ideal sampling rates for home studio recordings

Whether you are recording at home or in a professional studio, the sample rate you choose should be based on what the project is for and whether you will be collaborating with others.

Common sampling rates in studios

If you are just recording music for yourself, the basic rate of 44.1 kHz is fine to begin with; this is the rate for CD encoding that your project will be downsampled to if you choose to make CDs. Remember, you can always downsample with no ill effects, but you can never upsample previously recorded music. These days, many streaming services are capable of streaming lossless audio at 192 kHz, and many Bluetooth devices default to 48 kHz. If you are planning on releasing your music to the public, most suggest a higher sample rate than 44.1 kHz as 48 kHz is becoming the new minimum standard.

If you are recording music for film, you’ll need a higher sample rate that is coordinated with the music supervisor. The standard sample rate for video production used to be 48 kHz, but now 96 kHz and 192 kHz are standard rates. Film and TV use noises like gunshots and explosions with a much larger dynamic range than music, so a higher sample rate is needed in order to reproduce them accurately.

Pros and cons of higher sampling rates

It would seem to follow that one should use the highest sampling rate possible all the time, but this is actually not the case. If you use too low of a sampling rate, a phenomenon called aliasing can happen, which is a form of introduced low-end distortion. Aliasing can be corrected within the DAW but this correction can sound strange. It’s best practice to leave yourself some headroom before recording.

Similarly, using too high of a sampling rate can introduce its own type of distortion. If you are doing some extreme pitch shifting or other types of heavy sound design that requires a bandwidth of 80 to 90 kHz, then a high sample rate is necessary. Otherwise, too much headroom leaves too much space for different kinds of distortion to be introduced. Even though the headroom is in the range of inaudibility (remember humans can only hear up to 20 kHz), it is possible for ultrasonic distortions to creep over into audibility. Also, higher sample rates don’t actually reproduce the analog sound as accurately as lower ones, though they do reproduce the waveforms faster. Most audio technicians these days recommend an optimal sample rate of 88.2 or 96 kHz for music.

Choosing the right sample rate for your equipment

You can only record in the highest or lowest sample rate that your DAW is capable of. Both ProTools and Logic can record at 192 kHz. Based on what we’ve already discussed, any choice between 48 kHz and 96 kHz is probably going to be fine for your music. If you don’t have a lot of hard drive space, the lower rate will be preferable as the rates that are twice as large create files that take up twice the space.

If the music is for TV and film, you’ll need a higher sample rate as that is what will be used in mixing the sound. Many music supervisors also believe that as technology progresses, distortion from too much headroom won’t be an issue and 192 kHz will become the industry standard. They recommend recording at 192 kHz now to “future-proof” your music. If you have the time and inclination, play around with different sample rates and see how they sound to you; ultimately your ears will guide you to your opinion of what sounds best.

Sampling rate tips for different types of home studio projects

What you are recording and for what purpose will determine what sample rate you should use. Left to your own devices, you can choose whichever rate you’d like, but it’s good to be aware of the possible issues.

Vocal recordings

The standards of 44.1 kHz and 48 kHz are fine for most voices, but if you are recording classical singers (especially sopranos), use 96 kHz to make sure all the partials and unheard frequencies are captured.

Instrumental and band recordings

Acoustic instruments like guitars, violins, and pianos produce tones that are outside of the range of human hearing. We do perceive them, however, as a fullness or timbre difference in the audible sound. A lower sample rate might not make them sound as “accurate” as there are overtones that we experience as part of this fullness. For recording these instruments, 96 kHz is preferable.

With a larger ensemble like a big band or orchestra, you might want to consider a higher rate like 192 kHz to fully capture all the frequencies, especially if recording all of the players live in the same studio.

Podcast and voiceover productions

44.1 kHz should be fine for almost all spoken word projects. 48 kHz can be used if you’d rather adhere to a newer standard. If voiceovers are for visual media, you’ll want at least 96 kHz most likely but check with the sound designer and/or music supervisor. You cannot change your sample rate once selected, so determine the correct rate beforehand so you don’t have to re-record anything.

Optimizing sampling rates for vinyl pressing projects

The sampling rate requirements for vinyl are slightly different than those for digital files or media — for good reason!

Sampling rates and vinyl limitations

When preparing master digital files for vinyl pressing, sampling rate doesn’t matter as much as bit depth. A higher bit depth file with a lower sampling rate will sound better than a lower bit depth file with a higher sampling rate. Vinyl also has a frequency response from 7Hz to 50 kHz, so sounds over 50 kHz will not be reproduced at all. One has to be careful with audio sounds over 20 kHz as they can overheat the lacquer cutting head, leading to distortion. Instruments prone to this include cymbals, tambourines, and the high end of distorted guitars. Cymbals often can resonate as high as 100 kHz. Your mixing and mastering engineers will know this and be able to adjust accordingly; proper placement and levels for instruments with lots of high-end harshness should prevent any problems.

Best practices for vinyl mastering

Despite those limitations, 96 kHz is still the recommended sample rate for digital files mastered for vinyl production. This provides enough headroom for the higher inaudible but necessary frequencies, and if the files are mixed and mastered correctly, should result in no distortion during lacquer cutting.

Converting digital audio for vinyl pressing

Once your master files are ready, the pressing plant will use them to create a lacquer. The process of creating a lacquer is the same regardless of whether you are using digital files or analog tape as your source master; the audio is cut into the vinyl in real time using a lathe. Unlike CD pressing where the audio is ultimately downsampled into 44.1 kHz and 16 bit, you can cut your lacquer from higher rate files; 96 kHz/24 bit is currently the recommended specification. The files should be uncompressed WAV, Apple Lossless, or FLAC format; nothing sounds worse on vinyl than digital compression artifacts!

Technical considerations and challenges

It can’t be emphasized strongly enough to listen to your master files multiple times on multiple different systems. Imagine this written behind your eyelids in fire! Quadruple check your files to make sure everything is exactly as you want it and in the specified format to avoid any self-created problems.

Bit depth and its role alongside sampling rate

The audio bit depth of a file determines how many amplitude values are available for each sample and also how low the noise floor is. The noise floor is the total of all wanted and unwanted noises in an audio file. The deeper the noise floor, the more likely that quiet passages in your music can be heard without introducing digital hiss. The higher the bit depth, the greater the precision of the sounds recorded will be; the audible dynamic range will also be larger. Bit depth and sampling rate work together but are not particularly linked. Bit depth has no impact on frequency response. If you are working with higher sample rates, you will want at least a bit depth of 24 to make sure you’re providing the largest noise floor and maximum dynamic range.

Managing file size and performance in high sampling rates

If you are using high sample rates, your files will be larger and you will have more demands on your computer processor. Make sure you that have the right computer to handle these rates, or you’ll experience performance issues. Transferring larger files to engineers or pressing plants will take much longer. Your 192 kHz file might be four times as large as an equivalent 44.1 kHz file! Don’t be daunted though if the larger sampling rates are what you need. Give yourself plenty of time to work with the larger files and plenty of computer space to handle the rates needed.

Addressing potential audio artifacts

If your sample rate is too high based on the audio you’ve created (i.e. too much headroom), it is possible to introduce different kinds of audio artifacts. According to some audio experts, linearity — the exact replication of analog sound in the digital domain — decreases with higher sample rates and an artifact called intermodulation can occur. While this is caused in the ultrasonic frequencies above human hearing, it can affect the audio and be heard as unwanted distortion. The solution is to record with enough headroom but not too much headroom based on the sounds you’re making. 96 kHz is still probably fine for most music projects.

Another possible issue that can arise occurs by setting the sample rate lower and try to record a frequency that is too high. This results in aliasing, which sounds like low-end overcompressed distortion. It is possible to correct minor aliasing with low-pass filters, but this can sound strange and it’s best to just give yourself enough headroom at the start so this doesn’t happen.

Practical tips for audio engineers

If you’re experienced with digital recording, this will be old hat to you. But if you’re new to ProTools, Logic, or another DAW, it’s good to remember these tips about working with sampling rates. We’ll conclude with some practical tips:

Balancing quality and processing efficiency

Sound quality is going to come more from bit depth than sampling rate, but to avoid artifacts and maximize sound quality, you’ll want to record at the highest sample rate necessary and no more. When in doubt, 96 kHz is a solid choice straddling the line between efficiency and headroom. Your equipment and hard drive should be able to handle the processing speed and file size needed for the sample rate. If you are doing a lot of music for TV and film, your computer requirements will be much greater for audio production than if you are recording music for general release.

Testing and experimenting with different sample rates

If you have the time and inclination, experiment with different sample rates and see if you notice a difference. See if you can create on your own the kinds of digital artifacts we’ve been discussing; that way you’ll know how to identify them when they happen!

Collaborative projects and ensuring consistency

It’s vitally important that if you are exchanging files with one or more collaborators that you all are using the same sampling rate. Otherwise, audio won’t match up, files will sound at different speeds, and chaos will ensue! Agree on a sampling rate before starting the project and make sure everyone adheres to it. Again, the rate chosen should be one appropriate to the project and what it is going to be used for; 48 kHz and 96 kHz are emerging as standards if people are unclear what to use. If preparing audio for TV or film, get the appropriate rate from the music supervisor; it will probably be 96 or 192 kHz.

Ready to release your album?

Heading to the studio soon? Got any questions about recording at the right audio sampling rate so that your album sounds its best? Reach out to the experts at Disc Makers!