LFD AUDIO: Bews views: The thoughts, opinions and observations of Dr. Richard Bews:

Dr. Bews – as I understand it, volume controls of all kinds affect sound quality in negative ways, some more than others. Is there one type of level control that’s better than all others and if so, why? Also, how do your findings impact on future LFD designs? A: All pots have different sounds, even […]

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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 […]

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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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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: Q/A with Dr. Bews Are all your amplifiers a good match with electrostats?

Q: I’m thinking particularly modern Martin Logans, which are usually seen with McIntosh and Ayre amps. I’m following your site with interest, and see speakers from Spendor, Harbeth, Neat and Tannoy praised as wonderful matches for the LFD line. A: I have many LFD customers who use old and new quad electrostatic loudspeakers, but I […]

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LFD AUDIO: Dr. Bews discusses Integrated Mistral 2019 with and without phono stage

Hello Dr. Bews. What can you tell us about this new release? “The internal phonostage of the Mistral is based on a new circuit, which uses a dual op-amp, so is different to the phonostage LE and needs to be specified at manufacture since the back pcb needs to be modified to allow input “1” […]

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LFD AUDIO: Dr. Bews discusses LFD Integrated LPCD – the low powered class d

Hello Dr. Bews. What can you tell us about this new release? “The cost of the LPCD is for the standard line level version (NO remote control) is £7500, it can be configured to have internal phonostage or internal DAC (192khz/24bit SPDIF only), at a higher price (probably around 10% extra for phonostage and 15% […]

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LFD AUDIO: Q/A with Dr. Bews – The battery DiscStage; where does the cost go?

Q: Dr. Bews – your battery DiscStage is your most expensive product. Where does the cost go? A: I actually don’t get the usual manufacturer’s mark up with the Battery DiscStage, since it would become prohibitive in price. There are very expensive parts in the battery DiscStage, i.e. 26 off sealed lead acid batteries, 1W […]

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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: 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. EDITORIAL NOTE: The opinions expressed in the above post do not necessarily […]

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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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LFD AUDIO: DIY tweaking of their products

Occasionally I get a phone call or email about tweaking of a piece of LFD Audio electronics. Howard …. how about changing internal wiring, removing filters, adding better ones, inserting very expensive fuses making tweaks that seem obvious? I have two thoughts on this: first, there isn’t a product in the world that cannot be […]

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LFD AUDIO: Q/A with Dr. Bews – development speakers

Q: Dr. Bews. What speakers do you use during development? I use a pair of modified Celestion SL600 loudspeakers, rewired and the crossovers outside the box. These modifications helped immensely, to relieve the rather laid back, and slightly congested sound. Really I don’t think the absolute quality of the loudspeakers is that important when developing […]

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LFD AUDIO: Dr. Bews discusses the 2019 integrated LE(VI)

Hello Dr. Bews. What can you tell us about this new release? 20 years of evolution of the LE range of integrated amplifiers has resulted in the new LE(VI) which takes over from the LE(V). A complete revamp of the input stage in the power section where the following: carbon composite, carbon film resistors and […]

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