Engineers sometimes advocate using high-pass filters to clean up the low end and tighten the sound. Others believe that because of issues inherent in highpass filters, they should be used sparingly, if at all. So, who's right? Well, as with many aspects of audio technology, they both are in some ways. Let's dive deeper, and then explore Studio One's clever highpass filtering solution.
But before getting into the details, let's look at the big picture. Joe Gilder did a video called THIS is Eating Up All Your Headroom in Your Productions where he shows how low-end energy can accumulate and reduce headroom with no sonic benefits. This is why engineers often apply a highpass filter to a final mix. So, let's look at the sources that can lead to this accumulation of low-frequency energy, and the right way to fix them within individual tracks before they start accumulating in your final mix.
The Case for Highpass Filtering
Sometimes, low-frequency artifacts that you don't want travel along with your audio. One potential issue is a directional microphone's proximity effect, where getting closer to the mic boosts bass unnaturally. Hitting guitar pickups accidentally can generate low-frequency sounds. Transposing samples down by a couple octaves may put energy in the sub-sonic range and even if you can't hear sub-sonic audio, it uses up headroom.
Highpass filtering has other applications. Too many instruments overlapping in low-frequency ranges can create a muddy sound. For example, you might want to reduce some of a guitar's low frequencies to avoid interfering with bass. This is usually what people mean by tightening up the sound.
The Case Against Highpass Filtering
Analog filters produce phase shifts, but the phase shifts in highpass filters with steep slopes are particularly drastic around the cutoff frequency. Most digital filters model analog filters, so they also have phase shifts. Fig. 1 shows a typical example of phase shift in a digital highpass filter with a 100 Hz cutoff and a 24 db/octave slope. The bright line is the filter curve, the darker line shows the amount of phase shift.
Figure 1: Phase shift around the cutoff frequency of a 24 dB/octave highpass filter. The horizontal axis goes from 20 Hz to 20 kHz, so the phase shift impacts the audio well into the midrange. The vertical axis covers -180 degrees to +180 degrees of phase shift.
Wow! That looks scary, doesn't it? It would look even scarier if the slope was steeper than 24 dB/octave. Fortunately, our hearing can't detect phase changes-unless the audio interacts with other audio. This is why if you set a phase shifter effect's dry/wet control to all wet or all dry with no modulation, the sound is the same. You hear the phase-shifted effect only when there's a mix of wet and dry sounds.
When mixing, this phase shift can matter if two signals with similar waveforms are in parallel. For example, consider bass through a DI in parallel with bass through an amp, or two mics at different distances from an acoustic guitar or group of backup singers. The worst-case scenario is multiple acoustic instruments being recorded simultaneously in an acoustic space-the inevitable leakage means the various tracks will have quite a bit of audio in common.
Differing mic distances from a source will cause phase shifts anyway, but using a typical highpass filter (e.g., to reduce p-pops with vocals) will accentuate the phase shifts. In either case, if the parallel tracks have enough audio in common, when they're mixed together phase shifts will alter the sound.
Solution #1: Don't Worry, Be Happy
In many cases, tracks won't be in parallel with other tracks that have similar or identical audio, so there won't be any audible degradation from phase changes caused by a highpass filter. If using a highpass filter does introduce phase problems, cutting with a shelf or peak filter instead can reduce the low frequencies (albeit not in the same way). These filter types produce less drastic phase changes.
Solution #2: The Pro EQ3's LLC Filter
Highpass filters with steep slopes are popular because of their ability to remove bass artifacts and tighten up the sound. But if you need to tighten up or reduce bass artifacts with multiple tracks, inserting all those highpass filters will contribute significant phase changes. Phase variations in the bass range can be a problem (as anyone who's tried to mix in a small, untreated room knows), so it's unfortunate that highpass filters are the best choice for solving these problems.
However, linear-phase highpass filters don't produce phase shifts-that's their outstanding characteristic. You can use as many linear-phase highpass filters as you want, and not introduce any phase shifts.
But that has its own complications, because linear-phase filters require a lot of processing power. Using several multi-stage, linear-phase EQs in a project can bring your CPU to its knees pretty quickly, as well as introduce an annoying amount of latency.
This is why Studio One's solution is particularly elegant. The Pro EQ3 has a single linear-phase highpass filter stage (fig. 2). This covers the most common need for a linear-phase filter in most projects, without the CPU burden of a multi-stage linear-phase EQ where you may not need linear-phase operation for the other stages anyway.
Figure 2: The LLC linear-phase highpass filter (outlined in white) is producing the low-frequency cut outlined in light blue.
Enabling the LLC stage contributes about 31 ms of latency compared to the 50-100 ms from a typical multi-stage linear EQ, and takes care of the frequency range where you're most likely to need a linear-phase EQ. If adding the LLC filter is still too CPU-intensive for a project, or if the latency is bothersome, you can alway
Most recent headlines
05/01/2027
Worlds first 802.15.4ab-UWB chip verified by Calterah and Rohde & Schwarz to be ...
01/06/2026
January 6 2026, 05:30 (PST) Dolby Sets the New Standard for Premium Entertainment at CES 2026
Throughout the week, Dolby brings to life the latest innovatio...
01/05/2026
January 5 2026, 18:30 (PST) NBCUniversal's Peacock to Be First Streamer to ...
01/04/2026
January 4 2026, 18:00 (PST) DOLBY AND DOUYIN EMPOWER THE NEXT GENERATON OF CREATORS WITH DOLBY VISION
Douyin Users Can Now Create And Share Videos With Stun...
21/01/2026
Wisycom, a global leader in advanced wireless RF solutions, launches its new wideband antenna matrix, MATF, which supports RF and fiber for demanding multi-zone...
21/01/2026
Grass Valley will demonstrate how it is powering scalable, future-ready live production at FOMEX 2026, taking place February 2 4 in Riyadh, Saudi Arabia. Exhibi...
21/01/2026
BCNEXXT, the developers of the advanced playout platform Vipe, today announced that OKAST, the monetization-first OTT platform provider, is using BCNEXXT's ...
21/01/2026
Revamped design enables advanced capabilities, leading with powerful IP to HDMI conversion
Magewell, developer of innovative, high-performance video I/O and I...
21/01/2026
Jan 20th 2026, Changsha Kiloview today announced the launch of two major additions to its AV-over-IP ecosystem: the AVX24-4 Media HUB and KiloLink Station, ma...
21/01/2026
Latest version of enterprise-class Buttons brings simple, coherent control to more than 700 professional devices and applications
Bitfocus, the specialist in ...
21/01/2026
Clear-Com is pleased to announce the appointment of Kari Eythorsson as the new Regional Sales Manager (RSM) for Southeast Asia & Australia, based in Singapore,...
21/01/2026
Share Share by:
Copy link
Facebook
X
Linkedin
Pinterest
Bluesky
Email...
21/01/2026
Share Share by:
Copy link
Facebook
X
Linkedin
Pinterest
Bluesky
Email...
21/01/2026
Share Share by:
Copy link
Facebook
X
Linkedin
Pinterest
Bluesky
Email...
21/01/2026
Share Share by:
Copy link
Facebook
X
Linkedin
Pinterest
Bluesky
Email...
21/01/2026
RT News is pleased to announce the appointment of Jackie Fox as its new Washington Correspondent. Jackie is a multimedia journalist with RT News and has repor...
21/01/2026
From skilled trades to startups, AI's rapid expansion is the beginning of th...
20/01/2026
SVG Sit-Down: BitFire's Jim Akimchuk on the Future of Cloud, Remote, Softwar...
20/01/2026
From architecture to reality: What CBC's Milano Cortina 2026 workflows tell ...
20/01/2026
Milano Cortina 2026: Making the Winter Olympics and Paralympics workflow work fo...
20/01/2026
Countdown to Milano Cortina 2026: SVG Launches SportsTechLive Blog in Lead-up to...
20/01/2026
Grand finale: Rally Saudi Arabia pushes WRC to make the most of cameras and dron...
20/01/2026
State of Change: What's Happening in the Remote-Production Business?NEP Group, Game Creek Video, Dome Productions, Mobile TV Group, Program Productions exec...
20/01/2026
CFP National Championship 2026: A Look Back at SVG's Complete CoverageGo behind the scenes with ESPN, Game Creek Video, Van Wagner, and the champion Indiana...
20/01/2026
The Gotham, Film Independent, and Creators Coalition on AI Join Alliance
by Michelle Satter, Founding Senior Director, Sundance Institute's Artist Programs...
20/01/2026
The National Film and Video Foundation (NFVF), an agency of the Department of Sp...
20/01/2026
December, the first month of winter and the holiday season, has traditionally encouraged families to spend time together in front of the television. During this...
20/01/2026
During December, streaming's share of TV viewing in Mexico settled at 24.3%, an increase of 0.1 share points from the previous month.
Disclaimer: YUMI TV,...
20/01/2026
Christmas Day is Most-Streamed Day Ever with 55 Billion Viewing Minutes, led by...
20/01/2026
Share Share by:
Copy link
Facebook
X
Whatsapp
Pinterest
Flipboard...
20/01/2026
Disguise and ASB GlassFloor today announced a strategic partnership that turns the arena floor into a fully customizable interactive digital surface. This will ...
20/01/2026
Last summer, ITV celebrated the tenth anniversary of its popular reality dating show, Love Island. To ramp up the excitement of series 12 (launched in the UK on...
20/01/2026
Berklee's Mark Ethier Named One of SPIN's Most Influential People in Mus...
20/01/2026
Share Share by:
Copy link
Facebook
X
Whatsapp
Pinterest
Flipboard...
20/01/2026
Share Share by:
Copy link
Facebook
X
Whatsapp
Pinterest
Flipboard...
20/01/2026
Emergent, a provider of AI-powered media production solutions, today announced its presence at ISE 2026 in Barcelona, taking place February 3 6, where it will u...
20/01/2026
Back to All News
Netflix and Warner Bros. Discovery Amend Agreement to All-Cash Transaction
Business
20 January 2026
Global
Link copied to clipboard
All-C...
20/01/2026
Back to All News
Now You Can Play a Role in Our Live Events With Real-Time Voting
Elmar Nubbemeyer
VP, Member Product
Product
20 January 2026
Global
Link...
19/01/2026
CFP National Championship 2026: Indiana Football's Digital Crew Generate Hyp...
19/01/2026
CFP National Championship 2026: Van Wagner Relies on Experience for Indiana-Miam...
19/01/2026
CFP National Championship 2026: Game Creek Video Fields Premiere IP Compound for...
19/01/2026
CFP National Championship 2026: For a Slew of Studio Shows, ESPN Turns Hard Rock...
19/01/2026
CFP National Championship 2026: ESPN's Sweeping Live Game Production Leverag...
19/01/2026
The new L3Harris NOVA binocular system is the every-soldier goggle' - and the beginning of a new era for night-vison capability....
19/01/2026
The Majority of Those Surveyed Prefer to Buy Brands Who Advertise in Content Tha...
19/01/2026
Back to All News
Straight to Hell' Sets April 27 Premiere: Teaser Trailer,...
19/01/2026
New Workflow Enhancements for All Broadcast Pix Systems, Plus 4-Channel ISO Recording for Hybrid and Roadie Tyngsboro, Mass. - January 2025 - Broadcast Pix ann...
19/01/2026
Monday 19 January 2026
Sky News reinvents News at Ten for the modern audience with The Wrap
Sky News today announces The Wrap, a bold evolution of its 10pm ou...
19/01/2026
Back to All News
Netflix Announces the Series Nights & Days, Directed by Kamila...
Engineers sometimes advocate using high-pass filters to clean up the low end and tighten the sound. Others believe that because of issues inherent in highpass filters, they should be used sparingly, if at all. So, who's right? Well, as with many aspects of audio technology, they both are in some ways. Let's dive deeper, and then explore Studio One's clever highpass filtering solution.
