Types of resistors for crossovers?

Dear Colin, I have just fitted stock 2R7 Panasonic 0.1% metal film resistors to replace the “green” 2R2 wirewounds in series with the Millennium tweeters in my WD25Tex speakers. I expected a change ( a bit warmer) but was not prepared for such a drastic change – is this due to the 0,5R increase or […]

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My meter isn’t going to zero any more on ohm ratings

Dear Colin. My meter isn’t going to zero any more on ohm ratings, and it apparently can’t be calibrated. It’s a fairly low-end Radio Shack autoranging model. I saw that the “what do you need for repairing equipment” on a US thread suggested a Fluke 114 or 115. Is that still the best, or do […]

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This is the same technique used by a magician trying to trick you

Originally published 2016 Paul McGowan ….. In a recent post I apparently gave out a bad link to this fellow’s video so here’s another.   In the video, when you get a chance to watch it, you’ll probably pickup quite a few valuable tidbits of information and get a good view of how an engineer might […]

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Marketing as an influence on audiophile design

Hi Colin. To what extent – if any – does marketing influence your designs? It has ….. for a few things. I’ve not really taken much notice of marketing and to be honest, if an audio business is run by money grabbing twits like those I’ve met in the past then … no thanks. I […]

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The Art of Electronics (Horowitz & Hill) 3rd ed; still the best?

Dear Colin, The Art of Electronics (Horowitz & Hill) 3rd ed… … as DIYers probably already know is now out, only 25 years after the 2nd ed. My copy arrived today. I’m not trained in electronics and make no claim to more than a passing knowledge, but have enjoyed these authors’ style of presentation since […]

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HEADPHONE AMP CLASS A: JLH Class A headphone amp build help needed!

Dear Colin, I’d buy from you but as far as I can see one4audio. don’t make one – or do you or will you? Anyway, I’m planning on building a JLH class A headphone amplifier but am a bit confused regarding the transformer wiring/connection. The pcb requires 15v-0-15v AC power input. I plan on using […]

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Boutique brand, or mass-market gentlemen?

Hi Colin. First. Congratulations on rising phoenix-like from a difficult time with difficult people! From what I have read my impression is that you are intent on keeping Elsdon Wonfor Audio small; a boutique-brand if you will. However for the sake of conversation, or curiosity or whatever, if you wanted to, could the company be […]

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LINEAR POWER SUPPLIES: Where from?

Dear Colin, Linear power supply sourcing. Hi I am looking for a linear power supply. Either two single or a single with dual outputs I need a input of 240V AC and output of 20V DC 3-4 amps any pointers on where I might source a kit from would be most welcome. Cheers Vellerman Kits; […]

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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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