DIY Recording Equipment Podcast

Latest Episodes:

Designing Legendary Gear with Paul Wolff Jun 22, 2017

Show notes

Paul Wolff has designed more legendary pieces of gear than most of us have used. In his years with API alone, Paul designed the 550B EQ, 512 and 3124 mic preamps, Legacy console, and 2500 compressor. He was recently honored by NAMM TEC hall of fame for inventing the Lunchbox and 500-series format, which he helped turned into a cottage industry.

I was honored to have Paul on the podcast to discuss console design and how he's seen the industry change in the last 40 years.

Just a few of the things we discussed:

The origins of the 500-series
How Steve Perry became the first customer of the Lunchbox
The uphill battle to make gear that’s authentic to the API sound
What happened in 1978 to change the sound of most audio equipment
Paul's opinion that cloners "should be burned to death”

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Some Notes on API Jargon

As much as I try to keep our podcasts fairly jargon-free, I was guilty of using a lot of API model numbers without explanation this episode. These are:

550A: Late 60's, 3-band EQ
2520: The discrete operational amplifier (DOA, or "opamp") that's at the heart of most API designs
2488: Early 70's console
512: 500-series mic preamp designed by Paul
312: 60's mic preamp
3124: A 4-channel 312 designed by Paul
2503: The output transformer in most API gear
2500: Bus compressor designed by Paul

Analog Synth DIY with Abby Echiverri Apr 27, 2017

Show notes

I've often fantasized about building a huge analog synth. But besides the obstacles of cost and not having a spare room in my house for it, I've always found the DIY synth world to be a bit intimidating.

In this podcast, synth wizard Abby Echiverri walks me through the basics, such as:

Is it feasible to build your own synth?

How much should I budget?

What are the basic modules I need to build?

Abby is a composer, DJ, DIYer, and audio gear designer. I caught up with her when she was on the road as the synth/keyboard tech for Soulwax.

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Chassis Design with Jon Erickson Feb 16, 2017

Show notes

We audio nerds love to talk about particular parts and circuitry—transformers, op-amps, discrete vs integrated, passive vs active, etc—but we rarely discuss the biggest part and the one we actually interface with the most: the chassis.

In this episode of our resurrected podcast, I talk to Jon Erickson about the ins and outs of chassis design and manufacturing.

Jon Erickson has been involved with some of the most delicious-looking audio gear on the market: the A-Designs Pacifica preamp, JHS Pedals' line of 500-series modules, and his flagship Tonecraft 363 DI/preamp.

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"Explain Like I'm 5": Why Is Pro Audio Gear So Expensive? Feb 27, 2015

Show notes

Sticker shock is a common malady in the recording world. It takes a lot of money to outfit and maintain a studio. But why?

What are the factors that drive the price of professional recording gear?

Why does gear cost so much more than the sum of its components?

Are the prices justified, or is someone getting ripped off?

In this month's podcast, Peterson and Chris discuss what goes into the cost of a piece of gear, and how you can short-circuit some of these costs by doing it yourself.

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"Explain Like I'm 5": Filters Jan 29, 2015

Show notes

How do filters work?

As audio engineers, we use filters every day. We're all intimately familiar with high-pass, low-pass, band-pass, shelf, etc. filters. But how do they actually work in analog gear?

The basic operating principles of analog filters are actually very simple. In this quick (10 minute) podcast, Peterson and Chris explain the very basics of high-pass and low-pass filters so that any 5-year-old could understand.

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View the circuits we discussed in the podcast on Upverter:

“Explain Like I’m 5″: Audio Levels Dec 11, 2014

Show notes

What's the difference between "pro" and "consumer" line levels?

Is it ok to plug an instrument into a line level input?

What's the difference between peak and RMS levels?

In the long-awaited return of our "Explain Like I'm 5" podcast series, Peterson and new DIYRE team member, Chris, explain the basics of audio levels.

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Topics discussed:

Can you damage equipment by plugging the wrong thing in?
In analog audio Volume = Voltage
The difference between peak and RMS volume
RMS is a way of measuring AC as if it were DC
The most common levels you'll encounter in the studio:
- +4dBu, pro line level (1.22V)
- -10dBV, consumer line level (.316V)
- Mic level
- Instrument level
Tangent: why are microphone output levels so low?

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**Talking Tubes with DW Fearn** Aug 26, 2014
Show notes
DW Fearn knows tubes. Since he rediscovered the sound of tubes in 1991, DW (Doug) has crafted a legendary line of all-tube, all-red-front-paneled recording gear. In April I had the pleasure of visiting Doug at his home and workshop outside Philadelphia. Doug and I sat down on either side of a ribbon microphone and had a great conversation about tubes, electronics, and sound. During our conversation Doug tells the story of how he returned to tubes after decades of operating an all sold-state studio, and outlines the theory behind why tubes and transistors sound different in a clear and straightforward way.
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Topics discussed:

How Doug pieced together his first console from standalone amplifiers

What happened when he replaced that tube gear with a solid-state console

"We couldn't admit that it didn't sound good, so we just got used to it."

How a demo tape from college in 1966 led him back to building tube amps

"We didn't listen to recorded music in my household... live music was what I was exposed to. So when the time came to build a mic preamp, that's the sound I had in my mind."

Tubes vs transistors: why it's all about headroom

Even vs odd harmonics and how they relate to tubes vs transistors

"The less you torture it, the better it's going to sound. So you keep the signal path as simple as possible."

What Doug's new product design process looks like

The one equalizer that knocked DW Fearn out

DW Fearn refuses to wrestle a piece of gear into existence

Many thanks to Doug for having me out to his home and sharing his knowledge so freely. Thank you also to Paul K of Firehouse Recording for connecting us. You can learn more about DW Fearn gear at DWFearn.com.

"Explain Like I'm 5": Impedance Jul 18, 2013

Show notes

When I sent out the newsletter announcing the last "Explain Like I'm 5 Podcast," I asked which audio topics you wanted to hear explained to a 5-year-old. As as result I now have a list of over 25 topics for future shows! But the response I got the most was "impedance."

One reader even taunted me: "Haha, explain impedance like I'm five..good luck with that ;)" Challenge accepted, buddy!

Impedance is one of those audio concepts that comes up at almost every recording session or live sound gig, even if you're not aware of it. Grasping the basics of input and output impedance can make you aware of potential problems before they happen, and help you problem solve more quickly and confidently. And the truth is that the fundamentals of impedance are simple enough that you can learn them from a 15-minute podcast.

In today's ELI5 podcast, I begin with a discussion of acoustics before moving to electronics to show you that you already know more about impedance than you probably think. I go on to cover exactly what input/output impedance specs mean, illustrate the concept of impedance with examples from the studio, and explain what impedance mis-matches can do to your sound.

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Do you understand impedance now? How easy was the podcast to understand? Is there any other topic you'd like to hear explained as if to a 5-year-old? I welcome your feedback in the comments.

"Explain Like I'm 5": Balanced vs. Unbalanced Connections Jul 11, 2013

Show notes

This podcast marks the first of a new series in which I attempt to explain complex audio subjects so that a 5-year-old could understand them.

In this first "Explain Like I'm 5" podcast, I tackle the important subject of balancing. What is the difference between balanced and unbalanced connections? How does balancing work? Why do we need balanced connections?

In less than 15 minutes, I answer these questions the way I wish someone had for me: assuming no electronics knowledge, sticking to the basics, and using only terminology that a musician would understand.

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In order, I discuss:

What are balanced and unbalanced connections?
How can I identify the difference?
Why are there these two types of connections in the studio?
How does balancing reduce noise?
What is Common Mode Rejection Ratio (CMRR)?
If balanced connections are so great, why isn't everything balanced?

Mic Preamps and Surface-Mount Parts with Expat Audio Mar 14, 2013

Show notes

In this month's DIY podcast, I talk to Dafydd Roche of Expat Audio about their new Eden Mic Preamp.

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Dafydd and I get into some good stuff about mic preamp and general audio design, including:

The difference between surface mount (SMD/SMT) and through hole components in terms of sound and performance.
Are SMDs good for audio? Should we audio folks resist industry's march toward all surface-mount parts?
The concept of "parasitics" in audio electronics design and when their effects can be critical.
Dafydd gives us a guided tour of the Eden circuit from the input to output jacks--a great way to get a grasp on the basics of mic preamp design.

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