STAR EARTHING: What is it and what’s the point?

Hello Howard. Can you ask Colin please what is star earthing and does he / will he using it in his new designs? Ta muchly J.N Peterson {Colin} Dear J.N.Peterson star earthing should be used in all analog designs, that is a single zero or earth for every component on the circuit board and normally […]

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HELIUS: Howard Popeck speaks at length to people with interesting things to say: Geoffrey Owen, main-man at Helius Designs

Hello Geoff, and thank you agreeing to be interviewed about social media in our shrinking audiophile world. So …. my first question; what’s your perception of the importance or irrelevance of Facebook in reaching out to potential audiophile buyers? Ah. Hmm. Howard, I suspect that you’re interviewing the wrong person. When I started writing novels […]

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AUDIOPHILES? Audiophiles!

Dear Colin. I’m being a bit greedy here but two questions if I may In your opinion, what makes an Audiophile a true Audiophile? In your opinion, what do fake Audiophiles do that makes them fake? I know these two questions open the door to all kinds of jokes but I’m looking for more thought […]

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Equipment break-in; fact or fiction?

Hi guys. Is there or will there be an ‘official’ Elsdon Wonfor Audio policy on this. Here’s my view. I’m an adherent to the psychological theory of so-called break-in; it’s simply one’s brain adjusting to a new piece of audio equipment. I also like to compare it to the ancient therapy of acupuncture; break-in apparently […]

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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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HELIUS DESIGNS: Geoffrey Owen, founder, owner and senior design engineer writes about the 1983 Orion tone arm

The trouble with being an engineer is that one is born with a natural tendency to look at the world through critical eyes and consider how differently you might have designed the things around you had been have been given the job. But then, if ever you feel inclined to prompt such a discussion, most […]

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LFD AUDIO: 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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TIME COHERENCE – or what?

Mr. Wonfor / Mr. Elsdon. Am I correct in thinking that correct time coherence of all frequencies is inherent in music? If I have understood this them I guess it means that the sound of a human voice, for example, is time-coherent in all frequencies in a waveform that in itself is a specific time […]

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Power cord optimum length. A scientific basis or merely hype?

Here’s one for you electric wizards to kick around. Whilst attending a recent hifi exhibition I was doing some power cord shopping. At one particular display I was being told by a very well known cable company representative, I’ll not mention the name so it doesn’t influence any responses, that the rule of thumb is […]

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MONITOR AUDIO: Replacing ceramic resistors in GXC350 speaker

Hello Colin. Great series so far. Thank you. A little background info: I own a Monitor Audio GXC350 centre speaker and have discovered the midrange driver produces no sound. Swapping the driver over with one from a GX200 confirms it’s ok. A volt meter shows there’s no output to the midrange driver which points to […]

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BI-WIRING: A daft idea or what?

Gentlemen – what is this ‘thing’ called bi-wiring and will Elsdon Wonfor Audio be making speaker cables that use this tecnique? Thanks. Ron McQueen. {Colin} Dear Ron, bi-wiring is used to stop the reflection signal of one or more transducers affecting the movement or control of another. This can happen and it is caused by […]

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High quality “audiophile” grade sub panel

Dear Colin, audiophile grade sub panel and breakers? Do you know of a high quality “audiophile” grade sub panel? I read an article from someone in the audio industry where he mentioned having used a GE industrial grade 225 amp panel with a super duty silver plated copper bus bar and bolt on low noise […]

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Power line noise?

Colin – can we get meaningful measurements of power line noise? Is the noise too low-level to measure without exorbitantly expensive equipment? What equipment is required? Outside of laboratories, who has it? We buy all sorts of devices to clean up power. So why can’t we measure the noise that’s there and target it? Wayne […]

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COLIN WONFOR: An active speaker perhaps?

Hi Colin. Have you ever considered getting involved in active speaker design? From what I can gather, this is quite a complex task to get it right which is why, apparently so few companies get involved. I’m wondering if perhaps at some point in the future you might consider taking a good quality passive speaker […]

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External power supplies?

Hello Colin. I seem to have read somewhere that you feel that external power supplies for audiophile equipment Is really an irrelevance if the original power supply design has been correctly implemented. Have I got that right? If not, can you put your views to us? Thanks in advance, Nigel Okay, I did say that […]

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Battery drive for amplification

Hi Colin. Fashions, come fashions go and from time to time the market has been presented with battery powered devices from preamps, phono stages and power amps. As far as I’m aware you’ve never thought of anything battery driven. Is any particular reason for this? I’m wondering if you think the claimed sonic benefits are […]

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Zero autoformers; how to measure impedance please

Dear Colin, Zero autoformers; how to measure impedance please? I got a pair of Speltz zero autoformers recently but when I measure the total impedance, my multimeter sees only 0.4-0.6 ohm no matter what I do. It seems the multimeter could only read the DC resistance from the autoformer itself but not the total impedance […]

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OUTPUT TRANSISTORS: What is it that causes them to blow?

Dear Colin, Generally speaking, what is it that causes output transistors to blow? Do they tend to die a natural death? Bad drivers? Emitters? Problems with the rectifier circuit? Assuming there wasn’t shorted speaker wires or excessive moisture. The amp bias and the +/-77 voltage was fine before they blew. It happened on power up. […]

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PIONEER: Andrew Jones interview

Stephen Mejias writes: In our September issue, I wrote about Pioneer’s excellent SP-BS22-LR loudspeaker. At just $129.99/pair (and often discounted), the SP-BS22-LR represents extraordinary value and may very well attract a wider and younger audience to true high-fidelity sound. The only thing I don’t really like about the speaker is its tongue-twister of a name. […]

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WELL-TEMPERED: The Bill Firebaugh interview

J. Gordon Holt writes …..  Bill Firebaugh’s first product, the outrageous-looking Well-Tempered (tone) Arm, established him as one of audio’s most innovative designers. At the 1985 Winter CES, he showed a prototype companion product—the Well-Tempered Turntable—and was producing production units by January 1987. He discusses here the WTT’s unusual design features. (Readers should note that, […]

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EFFECTIVE MASS: Here is a cogent, scientifically based and rational explanation

Howard Popeck asked Geoffrey Owen, the driving force behind Helius Designs if he could and indeed would find the time to explain the reality behind effective mass and – in so doing – confound the misinformation, disinformation and scientific ignorance that clouds so many discussions of this topic. As an aside and somewhat mischievously, Howard […]

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