Articles on amplifiers and processors and signal processing:

Testing Amplifier Sound Quality

How much power do I need

New Amplifiers Buurion & Guurion (Norwegian text only)

Forum - A502 2-channel DSP Amplifier

Relevant links

Compact Horn Subwoofer Technology

What is horn-bass(Norwegian language only)

Multisub bass-systems and potential challenges

Specifications for subwoofers

Calibrating a bass-system