PS AUDIO: Global feedback

When we speak of global feedback we’re referring to the practice of wrapping the output signal of a device back to its input for comparison and correction. Because the input “knows” what’s right, a simple comparison circuit between the two serves to rectify any differences. Of course, nothing in engineering is a free lunch. You […]

Read More

So … how much headroom does a system really need?

Paul McGowan writes: I suppose the term “headroom” must have come about in response to tall people trying to make sure there’s enough room for their heads to go through a doorway or fit into a carriage.  Makes sense anyway. In audio, headroom means that there’s enough space to amplify music without running into the […]

Read More

PS AUDIO: Class is now in session

Paul McGowan … Sorry about the headline, just couldn’t resist.  We are going to start delving into the working of Class D amps, also incorrectly known as “digital amps” and correctly labeled PWM amps – short for Pulse Width Modulation. As is our custom we’ll start with an overview and then get into details. It’s […]

Read More

From the archives – when UK Vat was 17.5%. Ask an expert: Why are UK prices so much higher than US for the same audiphile gear?

Gentlemen. The Manley Stingray looks fabulous does it sound as good as it looks? In the past you have queried the difference in US and UK prices and I notice the Stingray is nearly £500 dearer in the UK than the states, but what happens the other way round when a British manufacturer sells to […]

Read More