Listening test albums

[andybob (Andrew Cox)]

Hi Dan,
This is the post and thread I was referring to in our chat today. What I was trying to say is that DSD is Pulse Density Modulation whilst a class D amp output to the power transistors is Pulse Width Modulation. Not very different at all.

Can HQ Player drive a class D amplifier? [Yes !]

Here’s some further articles on Wikipedia that have helped me understand more about this: Pulse Density Modulation. This is an SDM or DSD signal. Pulse Width Modulation. This is the output from a Class D input stage (Modulator) to the power transistors. PWM is a special case of PDM where the switching frequency is fixed and all the pulses corresponding to one sample are contiguous in the digital signal. For a 50% voltage with a resolution of 8-bits, a PWM waveform will turn on for 128 clock …

Further up the thread you’ll find reference to the Lynx speakers Jussi was working on with a manufacturer. They accept up to DSD 128, convert to Pulse Width Modulation and drive inbuilt power transistors with it. Jussi didn’t take up my invitation to comment about the way they sound. He generally restricts his comments to whether something is mathematically accurate or not.