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Conversions 4

Posted 7 years ago

Yesterday we traced the digital audio path from the input of the DAC all the way to the output of the DAC itself, which outputs a series of current steps, and are in the process of converting those current steps to voltage steps. You can use a simple resistor to make the current to voltage […]
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Amperage alchemy 2

Posted 7 years ago

We’ve briefly discussed getting the digital audio stream into the DAC and then decoding those bits back into a form of analog that gets us a lot closer to being able to play it on our systems. At the output of the DAC chip we have a series of current steps that need to be […]
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DAC attack 0

Posted 7 years ago

Yesterday we detailed the layout of a PCM DAC and its 4 components that make it work: the input receiver, DAC itself, Current to Voltage converter and finally the analog stage: the subject of this series. We want to try and understand why the output analog stage plays such an important role in the way […]
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Inner workings 2

Posted 7 years ago

We’re starting down the path of trying to unravel a bit of the topic why the analog output stage of a DAC is so important: perhaps more important than the DAC itself. To begin let’s first take a DAC apart into its 4 main categories so we can start with a clear understanding of what’s […]
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Analog matters 2

Posted 7 years ago

I thought we might delve into a new subject this week: the all important analog stage at the output of a DAC. I think this may make for some interesting posts as adisproportionateamount of attention is paid to the digital side of the DAC relative to the analog side. I smile every time I read […]
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Merry Christmas 1

Posted 7 years ago

Today’s a day for us to spend with our family and friends and enjoy life, music and the pursuit of happiness. I just wanted to pass along some good cheer and thank all of my readers for their trust and friendship. I hope we can continue to build community and friendship for a growing number […]
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Timing is everything 0

Posted 7 years ago

I wanted to finish up our little series on how Class D amps worked today, tomorrow we’ll enjoy Christmas with our families and then onto new and fertile grounds for audio the day after. We’ve learned that the output of a PWD amp is very simple: a series of on or off pulses that vary […]
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2

Posted 7 years ago

Yesterday we covered Analog Codingshowing how we have analog in and analog out with a Class D amplifier and no magic decoding process is required as we have in PCM. The direct output of the PWM engine is a series of on and off again pulses that can be fed directly into a loudspeaker to […]
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Analog coding 8

Posted 7 years ago

One of the reasons Class D amplifiers are considered by most to be digital (technically they are not) is the need to encode the continuous analog input signal into another language to work. So it may be correct, in many minds, to classify this amplifier type as something other than analog because of the encode/decode […]
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Just in case the world doesn't end… 0

Posted 7 years ago

Sorry, I am writing this yesterday and when I went to input the publish date I saw it would be the 21st, winter solstice, my son Sean’s birthday and “the end of the world”. So I am guessing that’s a bunch of bunk and I better have a post ready. We’re now ready to start […]
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Amp classes 0

Posted 7 years ago

In the past few days we’ve covered a lot of ground learning about the various amplifier classes like A, AB, B which are the main amplification classes, referring mostly to how the output stages of the amplifiers use power: efficiently or inefficiently. We also covered Complimentary, Push Pull and Single Ended output stages. There are […]
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Different strokes 0

Posted 7 years ago

Yesterday we explained how a single ended power amplifier worked and what the differences are between our traditional power amplifier output stage and this unique topology. Today I want to wrap up the background series on traditional amp topologies so we can move on to learn about Class D – a topology that is still […]
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Single ended frying pan 2

Posted 7 years ago

We’re in the middle of our series on amplifier classes (not learning classes, but output classes) and getting on to understanding one of the very different classes of analog designs, Class D. Along the way we’ve covered Class A, B and A/B. Today I thought we’d take a side street over to one of my […]
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A+B makes it all sound better 4

Posted 7 years ago

Yesterday’s post covered what Class B in a power amplifier means and the day before we explained Class A. It’s probably instructive to review what we’ve learned so far as there are new readers jumping on board daily and I don’t want to leave them out. We’re learning something about the different classes of amplifier […]
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Class B 2

Posted 7 years ago

Yesterday we covered Class A and what it means when it comes to a power amplifier. It’s been pointed out in our comments section that Class A biasing doesn’t have to apply only to a power amp output stage and, in fact, it is used extensively in the input circuits of most amps, preamps and […]
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Class warfare 4

Posted 7 years ago

First off, we’ve published a new videohttps://vimeo.com/55572974 which is a behind the scenes look at what goes into building a PerfectWave product. It’s pretty interesting if you’ve never seen what it takes to make a modern piece of audio equipment. It’s probably not politically correct to write about different classes of people, but I trust […]
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Start at the beginning or the end? 9

Posted 7 years ago

I was going to jump feet first into amps this morning but got blindsided by all the mail I receved on the order of importance when selecting equipment in Tuesday’s postGnats and Whales. It’s probably worthwhile to spend one day on the subject and return to it someday should the need to explore it increase. […]
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Digital amplifiers? 3

Posted 7 years ago

Whenever a conversation comes around to Class D amplifiers, they will inevitably be referred to as digital power amplifiers; a common mistake. They are not digital power amplifiers. They are as analog as class A and Class A/B amplifiers and it’s important to understand the distinction lest they get a bad rap merely by their […]
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Gnats and whales 7

Posted 7 years ago

As we wind up the beta testing on the newest product launch, the PerfectWave PowerBase, I am really pleased to see the positive comments and great reviews. But I am reminded that something like the PowerBase is an essential part of a high end system only if all the major elements have first been addressed. […]
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Fatigue 3

Posted 7 years ago

I am reminded by several of our readers that one of the best means of evaluating equipment is fatigue. Yeah, I know that sounds ominous but I am guessing we’ve all experienced our system’s sounding so good that we could listen for hours. And we do. But the opposite is very telling. Say you try […]
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Music is so much more than sound 9

Posted 7 years ago

One of our readers posted the topic subject in the comments section yesterday and it really struck me as getting to the core of it : lest we lose sight of where we’re going and where we want to be. “The goal for me is access to the creative and communicative force that music is. […]
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That old analog sound 15

Posted 7 years ago

In response to my post on the sound of analogreader John Van Polen from the Netherlands wrote me the following: “It’s a shame people tend to use the word “digital” as an equivalentof “bad” and “analog” as an equivalentof “good”. Well, what is so goodabout the wow, flutter, noise and so on of aless-than-top class […]
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The sound of analog 9

Posted 7 years ago

For those of you that followed along with our series on designing and building the PowerBase I thought I’d share with you a short behind the scenes video you might enjoy watching. You can click on this link to view the video. We’ve been focusing on the Art of Listening for a few days and […]
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Building a pattern 7

Posted 7 years ago

One of the most valuable tools I have in my listening arsenal is a set of favorite recordings I use over and over. Most of you probably have a few favorites as well, but in my case Paul’s Dirty Dozen plays a very critical role in the development of products and new designs. The selections […]
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Comparing notes 6

Posted 7 years ago

Think for a moment how challenging it must be to review a product for one of the publications that do so. You’re sent a new product, perhaps a DAC, and you’re asked to let the world know how it sounds. You replace the DAC you use as a reference and put in the new one. […]
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