A Loudspeaker That Can Play Square Waves?

This article describes a DSP (Digital Signal Processing) technique developed to correct loudspeakers’ frequency domain and time domain distortions. Performance improvements, observed using square wave excitation, are documented here in time domain and frequency domain. This article was originally published in audioXpress, June 2010.

I completed the design and construction of an archival phono preamplifier, which provides variable equalization along with several other operational necessities for playing vintage records (78-rpm discs, pre-RIAA LPs, lacquer transcription discs, and so on). When it came to selecting topologies for the balanced inputs and outputs, I ruled out transformers due to high cost, physical bulk, and weight. The most practical choice, in terms of size and cost, are the balanced line driver and receiver ICs made by THAT Corporation. This article was originally published in audioXpress, June 2010