So much of what we hear in audio cannot yet be measured. How then can engineers design circuitry around such unknowns and how do they know if they’ve succeeded or failed?

Headphone and loudspeaker amplifiers certainly seem like they should be the same but looking at them quickly dispels that notion. So, what is different between the two topologies?

With hundreds of videos, dozens of designs, multiple inventions to his credit, how does Paul McGowan get all his experience and information he shares with us?

There’s some great vintage audio equipment on the market still. What are the chances and opportunities to renew them with newer and better parts?

Clean power is said to be critical to the performance of high-end audio equipment, yet is that so? Power expert Paul McGowan gives us a slightly different viewpoint on the subject, one that’s going to be surprising to many.

What factors do we look for in the specifications of preamps and power amps to make sure we have the perfect match. Paul gives us a quick tour of the challenges and solutions to properly matching preamps to amplifiers.

When setting a subwoofer up should its frequency limits match those of the main speaker or lower or higher? This is a question asked a lot and Paul helps us understand the intricacies of the all-important setup process.

The loudness wars, or the war against dynamic range, is still alive and well and that is unfortunate. But, there’s hope and Paul helps us understand the beginnings of the loudness campaigns and why they are so prevalent today.

Some loudspeakers feature rear mounted tweeters in addition to their front mounted tweets. What are these rear ones for and what advantages do they offer music lovers?

Nights, days, weekends, workdays, the stereo sounds different to this viewer. Paul explains why and offers an interesting solution to an age-old problem that has plagued many a high-end stereo user for many years.