audioXpress January Inside This Issue · Supplemental Material · Digital Login. Voice Coil December Inside This Issue · Digital Login. Trending. Please note! We do not make coils wound on plastic bobbins due to risk of microphony, nor do we use ferrite cored coils that saturate abruptly. All Jantzen coils. audioXpress 1. Horn Theory: An Introduction, Part 1. By Bjørn Kolbrek. This author presents a two-part introduction to horns—their definition, features.

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All items tagged with audioXpress archive February 7, by Paul J. Stamler A Power Supply Spreadsheet This article describes a spreadsheet program for designing low-voltage power supplies using adioxpress IC three-terminal regulators.

The spreadsheets are in standard Excel format, and should work in just about any spreadsheet program. Each file has two main pages: This article was published in audioXpress, March December 13, by Gregory L. Charvat, two pre-amplifiers are used with a battery powered high voltage supply.

The audioxpresss voltage supply works by creating a square wave with a timer. The square wave is fed into a small audio power op-amp.

Items about: Project Articles | audioXpress

The output of this op-amp is back-fed into the secondary of an audio output transformer, generating high voltage AC V at 40 kHz. This signal is rectified, filtered, and regulated in a conventional sense. The entire system runs on 8 AA batteries and should operate for approximately 4 hours continuously.


This article was originally published in audioXpress, March The Audio Voice Newsletter. This article was originally published in audioXpress, Audixopress A PP 25L6 Amplifier In this classical tube amplifier project, author Bob McIntyre offers what is effectively the foundation aduioxpress many designs that we can find currently in the market.

This is not surprising. The Mighty Mouse is indeed a good sounding and inexpensive project that is also a good introduction to 200 amplification. A pot with 64 levels and precision metal film resistors that is hard to beat for sound or facility, as he describes it. The project started with a clean sheet, looking to address potentiometer design with a quality that rivaled existing designs while maintaining a audoxpress cost.

This article was originally published in audioXpress, September Ron Tipton was deeply impressed with this amplifier project which used only five transistors per channel, two of them being current sources.

Four Hybrid Solid-State Power Amplifiers

This article was originally published in the old audioXpress website as a PDF, but was never reposted. Now we make available online with updated references and links. March 14, by Richard K. Mains Correcting Driver Phase with Digital All-Pass Networks This article shows that in the digital domain, you can implement phase corrections in a very straightforward way, although there is still an approximation involved.


My focus here is on compensating for phase nonlinearities in the driver. This article illustrates the problem for the midrange driver in a three-way system, which will be crossed over to a woofer on the low end and a tweeter on the high-end. This article was originally published in audioXpress, January That’s what you normally get with a quality design, but to achieve it, the author shares the complete concept, power requirements, circuit topology, construction and testing of this single-ended amp I measured the response and it was not especially flat.

This convinced me to update the drivers. This article was originally published in audioXpress, June Which Measurements Matter, Part 1 The controversy over subjective versus objective loudspeaker evaluation has raged on for decades.

However, to my mind, there is no controversy. These criteria are simply two faces of the same coin. In over 30 years of designing loudspeakers, I have found the following measurements taken as a group provide the strongest predictor of loudspeaker preference available to us today.

Want to know more? Read this reference article, originally published in audioXpress, September