DIGITAL ROOM EQUALISATION: Is it a gimmick or does it have some application in domestic situations?

Neil, regarding digital room equalisation, is it a gimmick or does it have some application in domestic situations? I have heard these things in operation and I suppose that if you are prepared to spend any time experimenting and moving loudspeakers then it’s a good shortcut to a sort of middling performance. But by and […]

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UNLIMITED RMS: Logical or just smart marketing?

Q: Hi Mike. Some makers are extolling the virtue of seemingly unlimited amplifier power as a requirement for un-restricted system dynamics. Logical or merely smart marketing? A: Well I suppose it must depend on a number of things. Let’s take the things that it depends on. Sound pressure level – that you hear in your […]

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INTERCONNECT: Balanced vs. unbalanced audio

Which is the better interconnect for home audio systems? Balanced XLR or unbalanced RCA? Paul voices his opinion and explains the differences between the two and their reason for existence. Have a question you’d like Paul to answer for you? Go to https://www.psaudio.com/ask-paul/ and post it. Watch Now Paul McGowan

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CROSSOVERS: 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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Quill

VINTAGE: Equipment repair specialists

This is a growing free directory. It’s only a directory and not a list of personal recommendations by me. Entry to this directory is entirely free. Any enginner specialising in the repair, rebuild or upgrade of vintage audiophile equipment can email me: hp@no-alibi.demon.co.uk with their link for inclusion here. Currently this site has in excess […]

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PS AUDIO: Why haven’t these (switch mode power) supplies been used to better advantage?

Paul McGowan … Perhaps the single biggest reason to use a switch mode power supply (SMPS) on a power amplifier is that the output of a properly designed one is more like perfect DC than that of a conventional supply; and not just by a little bit. Conventional supplies switch back and fourth between plus […]

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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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BS – MAYBE: 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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PS AUDIO: Sonic texture

Paul McGowan … Describing what we hear as having a texture is an interesting Audiophile term.  What’s the texture of a violin or a tuba?  Do these instruments even have a texture?  Not really,  this is yet another term used to describe something we hear in a manner that is easier for us to relate […]

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IMPEDANCE: How to measure it?

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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DYNAMICS: Live albums and dynamic compression: CD versus DVD?

The thread starts:  As a public service… The following live albums are mastered with far less dynamic compression on DVD than on the corresponding CD for the same concert. (I have ripped the audio from the DVD and I listen to that now! They’re great!) Portishead, Roseland New York Jeff Beck, Performing this Week… Live […]

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