Headphones

Sennheiser

Beyerdynamic

AKG Acoustics

Grado Labs Inc

Headphone Forums

HIPPOhifi Forums

Head-Fi Forums

Headwize Forums

Software Tools

Foobar an excellent audio player

FLAC (Free Lossless Audio Codec) Player and Encoder

ASIO (Universal driver for WDM)

Product Definitions and Descriptions

Digital to Analogue Converter Description

Operational Amplifier Description