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Honestly I'm just happy you even record during events, the hotel room episodes are my favourite and this has to be the funniest intro of the podcast yet.
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3D-printed Karlson-style enclosure — it works
Printed (in sections, glued) a small Karlson style coupler enclosure for a 4″ driver, mostly to see if the weird slot loading does anything. Surprisingly, it does — broad midbass lift and a unique sound. Not hi fi. Very fun.
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Concrete-filled stands from 3D-printed molds
Wanted heavy stands without paying boutique prices. Printed the molds, poured concrete, demolded, capped with MDF top plates. 14kg each, dead as a brick. The top plate spikes thread into inserts I cast into the concrete.
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My first TPA3255 chip amp — pics + measurements
Built a TPA3255 amp from an Aliexpress board + a 48V/8A SMPS. For $70 all in the numbers are silly: <0.005% THD at 1W, dead quiet noise floor. Learned to add an inrush limiter after the SMPS made the lights flicker on power up.
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ShowcaseSolved
Finished: walnut MTM with Scan-Speak Revelators
The big one. Scan Speak Revelator 15W woofers in MTM around a R2904 tweeter, passive LR4 XO, real walnut veneer. Months of work. They sound like the money I spent on them, which is to say: very good and slightly painful.
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Full active 4-way with DSP — measurements inside
The endgame build: 4 way active , eight amp channels, everything time aligned in DSP. Sub, woofer, mid, tweeter. Measurements attached — the step response is the cleanest I have ever gotten. It took a year. Worth it.
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5 years, 11 builds — my DIY speaker journey
Lined up all 11 builds for a family photo. From a wonky first MDF box that buzzed, to the current active 3 ways. Every one taught me something the last one got wrong. If you are on build 1 and it sounds bad — keep going. It compounds.
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Finished my tapped horn sub — 18 Hz in a 2-car garage
Six weeks, a lot of sawdust, and one ruined router bit later — it works. 18 Hz at reference in the garage, and it moves air you can feel in your chest. Single 18″ pro driver, 310L folded. The hardest part was keeping the folds airtight.
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Desktop near-field monitors with a printed waveguide
Tiny 4″ + 19mm dome desktop monitors. Printed a shallow waveguide to pull the tweeter level down and match directivity. Active with a TPA3255 and a 2x4 HD. Near field on a desk they disappear. Couldn't be happier.
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Open-baffle full-range — vintage Coral restoration
Found a pair of Coral Flat 8 drivers at a flea market for €40. Reconed one, cleaned the other, mounted them on a simple H frame open baffle. The midrange is magic. Bass is... an open baffle, so, you know. Adding a helper woofer next.
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