Dick Pountain /Idealog 375/ 5th October 2025 : 09:53am
I love music and I love soldering. Here is a story that has both. I’ve explained my opinions about hi-fi here several times: I like good sound quality but I’m not a hi-fi nut, don’t buy oxygen-free cables or onyx cartridges or gold-plated anything (and definitely didn’t colour-in the edges of my CDs with a green marker pen). I won’t spend thousands on any component, and I wrote here how my listening was transformed by connecting a cheap Fosi Class 4 Bluetooth amplifier to my vintage Castle speakers (legacy items from when Dennis Publishing used to publish Hi-Fi Choice magazine).
All sound from my Chromebook Plus gets routed via Bluetooth through these speakers and I remain delighted by its quality, but a problem arose. I have to attend regular Zoom committee meetings, where we discovered that my Bluetooth remote arrangement was causing irritating echo effects for the other members, so I decided to resort to headphones. I purchased a set of moderately-priced JBL wireless headphones and that solved it, but it also created a slight annoyance for me because the dreaded Bluetooth wouldn’t automatically switch itself, so I had to manually disconnect the Fosi amp in Settings and select the JBLs.
Now with my other, sociological, hat on I’m a keen observer of the doings of GenZ youth, which recently include discovering a preference for vintage digital compact cameras over smartphones and for wired headphones over wireless ones. Aha I thought, in my Santa’s-Grotto-of-retired-digital-artefacts upstairs (covered in a recent column) there must be some of those, and there were indeed two – Sony MDR V100s and Sennheiser HD 201s that I hadn’t used for decades. I tried them, both worked and sounded surprisingly good, but the Sennheisers sounded terrific. So terrific I decided to do the pseudo-scientific thing, an A/B/C comparison with the Sony and Bluetooth JBLs. The result shocked me as I far preferred the Sennheisers. The JBLs were louder and had more bass, but somehow they, and the Sony, were less ‘engaging’.
Engagement is difficult to discuss without descending into woo-woo. The Sennheisers are very light (plastic and aluminium pressings), oval in shape so they completely encase my ears rather than resting on them. Their sound-stage is better balanced, with bass that’s not so pronounced but ‘right’. (As an aside, I personally judge sound reproduction by just two instruments, acoustic piano and double bass: for my A/B/C test I used the tracks ‘Mademoiselle Mabry’ by Miles Davis and Janacek’s ‘On An Overgrown Path’ played by Josef Páleníček). The Sennheisers induced what we used to call a ‘drugless trip’, where you engage so far that you feel there.
Problem was, those Sennheisers were made in 2005, the era of plastic-from-hell that turns into chewing gum with age. The outer insulation on their far-too-long cable was rotting and peeling, to reveal not the expected red or black plastic-covered conductors but a gleam of bare copper! I tried insulating tape, Gorilla tape, even silicon sealer, but ended up with an ugly, sticky mess. Wanting them so much emboldened me to replace the cable myself. Gemini taught me that those inner conductors are called ‘tinsel wire’, microscopically thin strips of copper coated with an insulating lacquer that you can’t just scrape off, spirally wound like guitar-strings around a central textile cord. Soldering them is a real challenge and reader, I took it!
From Amazon I bought two short cables with female RCA plugs going to bare wire, along with a longer cable from 3.5mm jack to twin male RCA plugs. Snipped off the old cable, took out four tiny screws to disassemble each earpiece, only to find a single black-box holding all the gubbins from which emerge two horse-hair-thin tinsel wires lacquered red and blue. YouTube explained how you create of large blob of molten solder and plunge the wire into it: if the temperature is just right that burns off the lacquer (with a puff of smoke), adheres to and tins the copper; if the temperature is too high it burns off the copper too; too low and it doesn’t adhere. I chopped up the old cable to practice and practice, only suffering one painful burn, and then did the deed.
Reassembling and finding they worked, I punched the air in triumph. Completed the job by discovering that my Chromebook’s two USB-C ports support high-def audio. Back to Amazon for a UGREEN adapter from USB-C to 3.5mm jack that contains a 32bit/384kHz DAC giving more volume and (perhaps) slightly better definition than the audio jack socket. The signal path from recording studio to my eardrums is long and convoluted, via TCP/IP, Wi-Fi and various different AC-DAC-and-backs, but at least I’ve managed to extract one irritating Bluetooth…
[Dick Pountain doesn’t have ‘golden ears’ but he does have dry earwax]