Professor M.J Hawksford (joint founder of LFD): Low-frequency sound source localization as a function of closed acoustic spaces

Further development of an emerging generalized theory of low-frequency sound localization in closed listening spaces is presented that aims to resolve the ambiguities inherent in previous research. The approach takes a robust set of equations based on source/listener location, reverberation time and room dimensions and tests them against a set of evaluation procedures to explore […]

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Professor M. J Hawksford (joint founder of LFD): Audio Amplifier Systems, A Compilation

This document is a compilation of technical papers relevant to both analogue and digital audio amplifiers and related systems. Topics include error correction, voltage-controlled amplifiers, current drive, current-to-voltage conversion and PWM. Emphasis is given to circuit techniques that include novel forms of distortion reduction. Audio Amplifier Systems, A Compilation (PDF Download Available). Available from: https://www.researchgate.net/publication/312557447_Audio_Amplifier_Systems_A_Compilation […]

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LFD AUDIO: Q/A with Dr Bews – Does a low output impedance usually results in better defined bass sound?

Dr. Bews writes: Low output impedance for line level products (provided impedance is less than 500ohms) I believe has little or no influence on subjective balance of a product. PSU design, parts selection, wiring, circuit layout,  etc have much more influence on sound. —//— For UK availability, prices, upgrade policy and more please phone Home […]

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LFD AUDIO: Q/A with Dr. Bews – Interconnects and the quest for neutrality

Q: Putting to one side for a moment your quest for absolute neutrality re your Interconnects, would it be fair to say that your Interconnects are to some extent a subtle ‘tone control”? If so, what would you recommend to tighten the bass between a solid state pre amp and valve power amp. Also between […]

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LFD AUDIO: A New Service Exclusively For LFD Audio Community Members:

An increasing number of calls I receive are requesting that I apply my specialist LFD Audio knowledge and experience to the question of surplus LFD Audio equipment on the auction sites and if it is a a good / appropriate match for the loudspeakers they are using, or are thinking of buying. I am happy […]

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LFD AUDIO: The Practical Reality (Unpalatable Truth) About Resale Values Of Pre-Owned Audio Equipment. Part #2 Or …. What Price Will You Actually Get For Your Surplus Lfd Equipment?

Good question, right? Right! Since 2011 I have been monitoring the AVERAGE ACHIEVED prices for pre-owned LFD Audio equipment SOLD PRIVATELY. Here are some examples. If what you are looking for isn’t listed here please send me a private message and I’ll give it some thought. Linestage LS1 £244 Linestage LS2 £490 Any other LFD […]

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The Practical Reality (Unpalatable Truth) About Resale Values Of Pre-Owned Audio Equipment. PART #1

It’s not unusual for owners wishing to dispose of surplus equipment to expect the highest possible prices. Unfortunately they are, in the main, unrealistic in their expectations. The owner’s perception of value may well (a frequently does) differ significantly from the buying public’s perspective. There are as I see it the following facets contributing to […]

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Re bi-wired speakers, how important is the type of jumper? Dr Richard Bews responds

Recently I wrote: This started way back at Subjective Audio in the 1980s I played music for the staff on our reference system, then going around to the rear of the speaker, making a quick ‘mystery’ change they all noticed for the better. What I did was simple; I moved the speaker cables from the […]

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LFD AUDIO: Dr. Bews’ design philosophy

Hi Howard. You have ended up only selling LFD amps. What makes them so special and what is their design philosophy please. And no jargon please if you can. Thanks. Ralph. Dr. Bews reply: LFD Audio believe that audio Amplifiers can be most easily optimized if the basic amplifier topology is kept as simple as […]

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LFD AUDIO: MCT phono stage and the very rare MCT ‘transformer coupled’ version – clarified by Dr. Richard Bews

What is the difference between the MCT phono stage and the very rare MCT ‘transformer coupled’ version? All MCT are transformer coupled (“T” in MCT). There is a (SE) version where the MAINS transformer is much larger (it retails for about £4k), also there is a slight change to a passive component. This gives more […]

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