The Live Sound “Gotcha”: When 48k AVB Fits the Amps, but Breaks the System Core

The Live Sound “Gotcha”: When 48k AVB Fits the Amps, but Breaks the System Core

Every system engineer knows that dangerous moment on a load-in day: the false sense of security. You’ve run your lines, your network switches are glowing with beautiful, stable activity LEDs, and the initial pink noise test passes with flying colors. You step away from the tech table to grab a cold coffee, entirely confident that the audio rig is rock-solid.

Then, you roll in the primary loudspeaker processor, and the entire house of cards collapses.

This is the story of a classic digital audio “gotcha”—a day where a perfectly innocent, standard-rate network conversion box works flawlessly with your amplifiers, only to hit a brick wall when plugged into the system’s central processing brain. It isn’t a hardware failure, and it isn’t the conversion box’s fault. It’s a clash of two entirely different architectural mindsets within modern professional sound systems.

Phase 1: The 48 kHz Honeymoon
The day starts simple. The venue or tour is built around a standard, reliable 48kHz digital infrastructure. To get those console channels out to the main PA over the network, you deploy a format converter to bridge your console’s protocol over to an AVB network stream. It effortlessly spits out a 48kHz AVB stream, pointing it straight down the network to your modern, network-native power amplifiers.

You open your system management software, route the AVB streams to the amps, and *boom*—clean audio.
Why does this work so beautifully? Because modern professional amplifiers are engineered with an “adaptable endpoint” ideology. Even though the internal DSP core of a high-end network amplifier almost always operates natively at 96 kHz,  manufacturers design these endpoints to be incredibly forgiving listeners. When the amplifier detects an incoming 48kHz AVB stream, its onboard network hardware automatically engages an internal Sample Rate Converter (SRC). It gracefully up-samples the 48 kHz network audio to 96kHz at the input gate without a single error or clock pop.
You walk away from the rack room smiling. The 48 kHz stream is happy, the 96kHz amps are happy, and the system sounds incredible.

Phase 2: Rolling in the System Brain
After lunch, the central system processor or immersive matrix engine arrives. This is the master brain tasked with handling complex distribution, time-alignment, tuning, or object-based spatial mixing for the entire venue. To maximize mathematical precision, filter accuracy, and the microsecond time-delays that modern sound system design demands, the configuration dictates that this core processor must be run at its native, premium 96 kHz mode

mode.

You re-patch the network. Instead of sending the conversion box’s 48kHz AVB stream straight to the amplifiers, you route those console tracks into the inputs of the loudspeaker processor first, intending to let the core brain do the heavy DSP lifting before handing the final mix off to the amps.
You click “Connect.”

Suddenly, the network status screen lights up bright red. Absolute silence fills the room. The system processor throws a massive clocking error and completely refuses to unlock the streams.

The Gotcha: A Tale of Two Ideologies
This is where the trap snaps shut. It is incredibly easy to assume that because manufacturers build seamless, automatic sample rate conversion into their *amplifiers*, they must have put that exact same capability into their flagship *central processors*.

They didn’t.

Unlike endpoint amplifiers—which only have to manage a handful of audio channels destined for a specific set of speakers—a core loudspeaker processor or matrix hub handles dozens or hundreds of simultaneous routing cross-points. Because of this massive processing scale, high-end system processors are designed with a strict “True Match” architectural ideology: the input streams must match the internal engine clock identically.

These heavy-duty central brains generally do not possess asynchronous sample rate converters across their primary network input cards. When you set that master processor to run at 96kHz, it completely blinds itself to 48kHz AVB streams. It cannot upscale them on entry the way the amplifiers did just an hour prior.

Not a Fault, But a Generational Shift
It is tempting to blame the conversion box in this scenario, but the box is doing exactly what it was asked to do: outputting a clean, stable 48kHz network stream. The breakdown occurs entirely because of a shift in engineering mindsets between different classes of DSP hardware.
An amplifier is designed to be a flexible destination; it adapts to whatever flavor of audio you feed it because it sits at the very end of the line. A core matrix processor, however, is designed to be the absolute master clock authority of a massive sound system; it demands total consistency across its inputs to maintain strict, deterministic processing latency and absolute mathematical accuracy

The Fix for the System Engineer
By the time the sun starts to set, the lesson is learned. To get out of this corner, you have two choices:

1. **The Compromise:** Force the central loudspeaker processor to drop its internal engine down to 48kHz to match your conversion box. You lose a tiny bit of high-sample-rate resolution on paper, but the network immediately locks, the audio flows, and the show goes on.

2. The Right Tool for the Job: Recognize that a 48 kHz console infrastructure and a 96kHz system processing core need a dedicated mediator. You introduce a heavy-duty, system-grade hardware network bridge—one specifically engineered with the massive asynchronous processing horsepower required to upscale a 48kHz world into a strict, pristine 96kHz network stream before it ever hits the processor’s input gate

the show must go on:

The Hybrid Infrastructure Compromise: If you are dealing with a permanent installation or a split system where some zones absolutely demand 96kHz networking but others are trapped in 48kHz, you start splitting lanes. You run an old-school, analog 2-wire copper lines straight into a handful of local amplifiers to bypass the network entirely, while simultaneously building an AES3-to-AVB hardware gateway elsewhere in the rack. By taking a 48 kHz AES3 feed and running it through a local gateway that handles the up-sampling to 96kHz AVB, you can feed the master processor exactly what it wants for the main array, leaving the copper to handle the rest.

In live sound, assuming that two pieces of gear from the same generation or ecosystem think the same way is the fastest route to a headache. Always look past the network jack on the chassis, check the clocking architecture under the hood, and remember that just because an amp can adapt, doesn’t mean the brain can.

The Goldilocks of Excavation

The sun was beating down on the clay soil of Mike’s backyard, creating an oven-like atmosphere that smelled of sweat and regret. Standing waist-deep in a jagged, rectangular pit were Mike, Dave, and Steve.

They had been digging for six hours. They had progressed roughly two feet.

Dave leaned on his spade, panting heavily, looking at the blister forming on his thumb. He looked up at the rim of the hole, then over at the empty driveway.

“I’m just going to say it again,” Dave wheezed. “Why didn’t we get an excavator?” Continue reading

TWiRT 712 – Fun with AI Inspires Broadcast Engineers – Matt Aaron & Anthony Kuzub

The rise of AI-generated lyrics and music is giving engineers something to chuckle about. But could this “easy creativity” inspire other engineering solutions? Kirk drew a comparison with photographer Jeremy Cowart and his use of an LED wall to produce 60 different portraits in 60 seconds. Anthony Kuzub, an engineer at CBC in Canada, pointed out the AI that’s involved with lighting a new studio, matching accent lights to the video monitor feeds. Matt Aaron is programming a fully-AI streaming station that’s playing “Broadcast Engineers Gangster Rap”. Are these just passing curiosities? Or are they signals of technologies and techniques to come for broadcasting and content creation?

Show notes: “The Legend of Chris Tarr” from suno.com https://suno.com/song/ecb43422-a9a0-4…

And another version of “The Legend of Chris Tarr” https://suno.com/song/9f924c42-c5b7-4… Matt Aaron’s AI-music streaming station https://broadcastengineeringgangsters…

And if Kirk had a radio station, KIRK, this could be the theme song https://suno.com/song/7e61f354-34e0-4…

Anthony mentioned ElevenLabs for text-to-speech and AI voice generation https://elevenlabs.io/

Anthony noted the Roland VC-1-DMX video lighting converter https://proav.roland.com/global/produ…

 

The last meter

Quote

“The last meter” refers to the final connection between an audio device, such as a microphone, headphones, or speakers, and the larger sound system or network. Just as “the last mile” in telecommunications represents the crucial final stretch that delivers service to the end user, “the last meter” in audio engineering highlights the importance of the final cable or wire, which directly impacts the quality and reliability of the sound being transmitted. Despite its short length, this connection is critical for ensuring the integrity of the overall sound system.

AES Member Profile – aes.org/AES/APK/ no longer working

AES Member Profile
Anthony Kuzub
Anthony Kuzub
Job Title: Sr. Systems Designer
Company: CBC / Radio- Canada
Status: Member
Member since: 2009
Technical Committee: Network Audio Systems
Standards Committees: SC-02-01 (Digital Audio Measurement Techniques), SC-02-02 (Digital Input/Output Interfacing), SC-02-02-K (Multichannel audio in AES3, X196), SC-02-02-L (MADI over twisted-pair cabling), SC-02-08 (Audio File Transfer and Exchange), SC-02-08-E (X212 HRTF file format), SC-02-12 (Audio Applications of Networks), SC-02-12-H (AES-X192), SC-02-12-J (Network Use Cases), SC-02-12-L (Open Control Architecture), SC-02-12-M (AES67 development), SC-02-12-N (Media network directories), SC-02-12-P (Broadcast and Online Delivery), SC-02-12-Q (Streaming Loudness), SC-02-12-R (Streaming audio metadata over IP), SC-03-06 (Digital Library and Archive Systems), SC-03-12 (Forensic Audio), SC-04-03 (Loudspeaker Modeling and Measurement), SC-04-04 (Microphone Measurement and Characterization), SC-04-04-D (Project AES-X42), SC-04-04-E (Microphone comparisons), SC-04-08 (Sound systems in rooms), SC-05-02 (Audio Connectors), SC-05-02-F (Fiber optic), SC-05-05 (Grounding and EMC Practices)
Primary Section: Toronto

Company Website: http://www.CBC.ca
Other Professional Website: http://www.TorontoAES.org
Personal Website: https://like.audio
Contact: Anthony Kuzub
Audio Fields:
Broadcasting – Television Sound
Broadcasting – Studio
Broadcasting – Transmission
Broadcasting – Radio
Job Duties:
Designer
System Designer
About
Vice Chair Toronto AES 2017-2019
Chair Toronto AES 2019-2021

Bio:ANTHONY KUZUB updated May 2021

Anthony is a 3rd generation recording / broadcasting engineer. Obsessed with audio from a young age, he studied Ward-Beck Systems console schematics while his dad worked at CFQC-TV in Saskatoon. He maintains WBSps.ca , a Preservation Society whose members collate tech info and documentation about the legendary Toronto manufactured broadcast equipment. After 15 years of owning studios, producing music, mixing for IATSE 300, and refurbishing consoles he moved from Saskatoon to Toronto. In 2010 Anthony commissioned Revolution Recording as their Technical Supervisor. While Rush was recording in studio A, he built a custom Ward-Beck Systems Mixing Console for C. Anthony consulted, upgraded and designed audio equipment for community pillar like Livewire, Joao Carvalho Mastering, Lacquer Channel, many private individuals and studio visitors.

In 2016 he earned an Honors Diploma in Communication Engineering from Seneca Toronto.
Upon graduation, Anthony worked as the IP audio product manager for Toronto’s Ward-Beck.Systems. While taking on the role as Chair of the Toronto Audio Engineering Society (www.TorontoAES.org) he designed networked audio systems for railroads, broadcast plants, transmitter sites, production studios and virtualized production environments. Most notably were his contributions in an AES70 commanded remote controlled microphone pre-amp with AES67 transceivers meeting SMPTE 2110-30 compliancy. Anthony has designed, engineered, manufactured and supplied the highest quality broadcast and studio equipment to television and radio broadcasters worldwide.

As of 2020 Anthony has been working with the Canadian Broadcasting Corporation to design systems to best implement Audio Engineering Society standards. Leading projects with engineering Solution for the Media technology and infrastructure services. Anthony’s current portfolios include real time and file transport of production audio for radio, television and digital production.

Anthony is actively involved in the technical development of audio and media control standards.

 

Timeline;

1997-2010 – Recording studio Producer / Engineer: High Voltage Recording – Tanda Recording
2003-2018 – Audio Technician: Bell Media, IASTE 300
2010-2013 – Revolution Recording + Custom shop – Technical Supervisor – Console restoration
Ward-Beck Systems Mixing Console for their third room. Livewire, Joao Carvalho
Mastering, and Lacquer Channels Cutting system.
2013-2016 – Honors Diploma in Communication Engineering – Seneca Toronto.
2019 – Author – AES72-2019: AES standard on interconnections – Application of RJ45-type connectors and quad twisted pair cable for audio interconnections.
2014-2019 – IP audio product manager – Ward-Beck.Systems Toronto
2019 – Chair AES SC-05-05 – EMC practices
2020-present – CBC Radio Canada

Education Background
Seneca College of Applied Arts and Technology:

Degree Name: Electronics Engineering Technologist Communications

Grade: Honours

A comprehensive investigation of electronic circuitry, diagnostic techniques, applied mathematics, process control, and computer systems/networks. An advanced study of communication topics, including digital and data communications, the characteristics of signals and transmission media, cellular wireless systems, as well as broadband to the home.

This is a 3 year program that provides 30% hands—on laboratory work.

Program link: http://www.senecacollege.ca/fulltime/ELM.html

Software Development;
C, C++, VHDL, VB.NET, VEE, MATLAB

Employment History
www.MuchMusic.ca
Http://Ward-Beck.Systems
Http://RevolutionRecording.com

Related Experience
Anthony has spoken at NAB, AES, IBC, SMPTE meetings on the topic of networked audio using AES67 and ST2110-30

Why Am I An AES Member?
Birds of feather flock together.

To play for the Tie:

AES Member Profiles
If you are an AES member and would like to create your own AES member profile like this one then click here.

Schrödinger’s Delivery

Quote

Schrödinger’s Delivery:   A hypothetical situation where a delivered package exists in a paradoxical state—it is both delivered and intact, yet simultaneously at risk of being broken. The outcome remains uncertain until you open the door to retrieve it. Until that moment, the package theoretically exists in both states: safely delivered and potentially damaged.

 

The time is coming….

It’s killing my time and is a distraction. Screen Shot 2013-07-18 at 12.58.45 AMI have a bad case of red-pellet syndrome (where you’re constantly seeking the red-pellet of connection)

I will be posting everything I can on PhaseBook.org as it’s content I can control. Facebook is falling apart and I want as little as I can to do with it.

I will be reaching out to my friends and colleagues and maintaining a roll-o-dex

You can still http://CallMeWhenFrustrated.com/

This sucks – Bias no longer operating

Doing a migration from one computer to another I’ve lost my ability to licence a software a really enjoyed. Bias Peak and Bias Sound Soap. Their licensing server has been shut down and I cannot authorize it. I understand there are downsides to dongle licensing, but in this case I think it would have saved my tool.

I say boo to bias being gone, but boo to a bad licensing system.

Screen Shot 2013-04-07 at 11.11.57 AM

Screen Shot 2013-04-10 at 9.27.38 AM

Urge to smash

Image

I recently acquired a new computer and have begun the “Migration” from old to new. I know it’s not a quick process (600+ Gb from machine to machine) but by my math this estimation, using FW800, was WAY OUT. The problem turns out that the computer was going to sleep during this migration!! Why the HELL would it do such a stupid thing? There were no options for sleeping as it’s a fresh install. Shame on Apple.
20130406-161206.jpg

After three failed attempts, I had to find a solution to me sitting at two idle computers for 8 hours.

AND HERE IT IS!
(standby for video)
Fanimation

20130406-161032.jpg
I needed to be able to leave it also… so in an audio Macgyver moment of desperation I turn to my biggest fan. The cable for the Trackball is moved by an oscillating fan. The headphones are on top of an upside down trackball, this and the duct tape give the trackball some weight to push on the keyboard (for computer 1) the movement also pushes a button on a Magic Trackpad (computer 1)

so far attempt number four is going smoothly (knock on wood)

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Quotes

Technology & Engineering

  • “Recording is not what one hears, but what one must make others hear.” – George Martin
  • “No one hates audio as much as someone who loves audio.”
  • “A patent is license to litigate.”
  • “Half of engineering is fooling other engineers.”
  • If the work doesn’t require creativity, delegate it, automate it, or leave it.
  • “Tesla built motors in his head and ran them in his head for months to test bearing wear.”
  • “You’re not useless. You can always serve as a bad example.”
  • “You look like you know what every crayon tastes like.”
  • “He’s an oxygen thief.”
  • “If engineers were capable of faking empathy they’d make great politicians.”
  • “Boredom is an insult to your intelligence.”
  • “If elevators were never invented the penthouse would be the cheapest.”
  • “One accurate measurement is worth a thousand expert opinions.” – Grace Hopper
  • “You don’t manage people, you manage things. You lead people.” – Grace Hopper
  • “A book is a machine to preserve text.”
  • “A scientist can spend a million dollars to discover a new idea, but an engineer can take that idea and turn it into something worth millions.”
  • “Corporate tears, music to my ears.”
  • A creative person is motivated by the desire to achieve, not by the desire to beat others.
  • “I’m not in any rush – I know something’s going to go wrong, so i want it to go wrong nice and slow.” – AVE
  • “Woodworking is making boxes and calling them something else.”
  • “Why should i buy something for $100 when i can spend 6 weeks of my life making it for $500?”
  • “Crafting is actually two hobbies – doing it, and shopping for it.”
  • Found on a shop drawing: “Cut to length, beat to fit, file to suit, paint to hide” or “Hammer to shape, file to fit, paint to match.”
  • “Definition of a craftsman, regardless of field is: ’10 years, 10 fingers’…”
  • “So dumb he’s thinking in 7 bit words.”
  • “There are only two ways to do things. Right, and twice.”
  • “Plan three times, measure twice, make once.”
  • “Don’t let perfect get in the way of done.”
  • “You have to be smarter than the piece of metal in the vise.”
  • “The problem with making something foolproof is underestimating the fool.”
  • “There is thousand ways of making something wrong.”
  • “I’ve seen less done in more time.”
  • “The machine hates you and only wants to make scrap.”
  • “I have something more powerful than options at my disposal, I have a whole machine shop”

 

Knowledge & Learning

  • “The whole secret of life is to be interested in one thing profoundly and in a thousand things well.” ― Horace Walpole
  • “Seek evidence that disproves your most cherished beliefs and those of others. This is the essence of true science.”
  • “Interested people are interesting.”
  • “Two months in the lab will save you two hours in the library.”
  • “We never really grow up we just learn how to act in public.” ― Bryan White
  • “Don’t be afraid to start over. This time you’re not starting from scratch. You’re starting from experience.”
  • If you’re making mistakes, it means you’re out there doing something.
  • “Larry king: ‘I never learned anything while i was talking’.”
  • The answer is always no until you ask.
  • “Every public action, which is not customary, either is wrong or, if it is right, is a dangerous precedent. It follows that nothing should ever be done for the first time.” – Francis Cornford
  • “The problem with the english language is there too much english in it.”
  • “If you want facts read a book – if you want to learn, find a teacher.”
  • “Research not re-search, why do you need to search for something again?”
  • Experience is a hard teacher because she gives the test first, the lesson afterwards.
  • “Never stop learning. Even an idiot sometimes has a great idea. I know, i am often that idiot.”
  • “Teach a man to fish he’ll pay you once, sell a man a fish and he’ll pay you for a lifetime.”
  • ” what must be known eventually should be known immediately” – Henry Kissinger

 

Attitude & Self-Improvement

  • The best apology is changed behavior.
  • “It doesn’t have to be done right the first time. It just has to look like it was done right the first time.”
  • “A stupid question better than a stupid mistake.”
  • “There is nothing noble about being superior to your fellow man. True nobility lies in being superior to your former self.” – Hemingway
  • “Change happens when the pain of staying the same is greater than the pain of change.”
  • “Slow is smooth and smooth is fast.”
  • “If nothing we do matters, then all that matters is what we do.”
  • “Religion is doing what you’re told, no matter what is right. Morality is doing what is right, no matter what you’re told.”
  • “You will never be great if you don’t have the patience to be average for a while.”
  • “The most successful people are those who are good at plan b.”
  • “The graveyards are full of indispensable men.”
  • “Anxiety is just ambition without action.”
  • “No one can make you feel inferior without your consent.”
  • “We do this not because it is easy, but because we thought it would be easy.”
  • “you dont have to earn my trust, all you can do is loose it”
  • “Thinking is stressful. Doing is easy.”
  • “Harsh feedback hurts less than harsh outcomes.”
  • “I was wrong builds more respect than i told you so.”
  • “Kites rise highest against the wind – not with it.” – Winston Churchill
  • “A man does not build his reputation on what he is “going” to do. Don’t judge yourself by your intentions but by your actions.”
  • “Discipline is doing what needs to be done even if you don’t want to do it.”
  • “Bite less; chew more.”
  • “Sucking at something is the first step towards being kinda good at something.”
  • “You become who you spend your time with.”
  • “Success is getting what you want, happiness is wanting what you get.” ― W.P. Kinsella
  • “It’s better to take care of it now than have to think about it later.”

 

Interpersonal & Societal

 

  • “If there’s one universal truth throughout history its that the people shutting down the press are the good guys, always.”
  • “Friends are family chosen by you.”
  • “I’m not upset with you personally, this situation just sucks.”
  • “When you’re good at something you’ll tell everyone. When you’re great at something they’ll tell you.”
  • “Fairy tales do not tell children the dragons exist. Children already know that dragons exist. Fairy tales tell children the dragons can be killed.” – G. K. Chesterton
  • “If you run into an asshole in the morning, you ran into an asshole. If you run into assholes all day, you’re the asshole.”
  • A people hire A people, and B people hire C people.”
  • “We are what we pretend to be, so we must be careful what we pretend to be.” – Kurt Vonnegut
  • “I understand if this is where the road ends, but if you can do or recommend anything, i’d really appreciate it.”
  • “I really appreciate your patience and willingness to try.”
  • ” How was the play?” ” You know, people pretending to be people”
  • “Secrets, secrets are no fun, secrets, secrets hurt someone.”
  • “If you aren’t at the table, you’re on the menu.”
  • “You don’t have to attend every argument you’re invited to.”
  • “I have a formula (for good management) – three words: Organize, deputize, and supervise. You can always find people who are smarter than you are to do a job – if you pick the right people and you give them full authority to run it – and let them run it without any interference. If they make too big of a mistake, you fire them.” – Wilkie Leighton
  • “It’s amazing what you can accomplish when you do not care who gets the credit.” – Harry Truman
  • “Too many people think arguments are about finding out who’s right, rather than what’s right.”
  • “Don’t try to understand women. Just try to understand one woman at a time.”
  • “Fatherhood is the grief of leaving one stage of life, while being overjoyed about entering the next.” – Christopher Sampson
  • “Make friends with change, it’s the only thing you can count on.” – Cullen Bohannon
  • “There he goes. One of god’s own prototypes. A high-powered mutant of some kind never even considered for mass production. Too weird to live, and too rare to die.” – Hunter S. Thompson
  • “There’s two types of parent: The ‘i’m in deep shit, i hope my parents don’t find out!’ and the ‘i’m in deep shit, better call them!'”
  • ” Look, working with you is like working alone, only harder”
  • “If you pick up a starving dog and make him prosperous, he will not bite you. This is the principal difference between a dog and a man.” —Mark Twain

 

Life & Humor

 

  • “There are many parts of my youth that i’m not proud of. There were loose threads – untidy parts of me that i would like to remove. But when i pulled on one of those threads – it unraveled the tapestry of my life.” – Captain Jean Luc Pickard
  • “Here’s hoping a random universe works out in your favour.” – Young Sheldon Chem teacher
  • “The early bird gets the worm, but the late worm dodges death.”
  • “The longer i live on this planet, the more i understand why roosters start their day screaming.”
  • “A fish tank is the opposite of a submarine.”
  • “A man with one watch knows the time, a man with two is never sure.”
  • Normality is a paved road. It’s comfortable to walk, but no flowers grow.
  • “Lemons are not a naturally occurring fruit. They were created in se asia by crossing a citron with a bitter orange around 4000 years ago. They were spread around the world after found to prevent scurvy. Life didn’t give us lemons.. We made them ourselves.”
  • “Make plans like an adult and believe in them like a child.”
  • “With the all spark gone, we cannot return life to our planet. And fate has yielded its reward: a new world to call… home. We live among its people now, hiding in plain sight… but watching over them in secret… waiting… protecting. I have witnessed their capacity for courage, and though we are worlds apart, like us, there’s more to them than meets the eye. I am, optimus prime and i send this message to any surviving autobots taking refuge among the stars: we are here… we are waiting.” – Optimus Prime
  • “They say people with autism take things literally. I disagree, those are kleptomaniacs.” – Ztexcius
  • “There’s those thinking more or less less is more but if less is more how you’re keeping score? Means for every point you make your level drops kinda like its starting from the top you can’t do that…” – Eddie Vader
  • “Great moments in human history usually have an opposition that is exactly proportional to their greatness.”
  • “And remember, no matter where you go, there you are.” Confucius