Yep, that's the one!
It was basically an homage to a concert hall in Japan that had all this acoustic architecture incorporated to enhance hall effect and resonance of sound. That was the rage in the 80's prior to the digital take-over. In other words, when analog methods were employed to experience the depth of sound - before it became "modeled" in digital sound processors.
So, Sony made this Walkman that paired with a set of headphones. At the time, ear-bud-ish headphones just came to be, and electronic miniaturization was ruling the persistence of vision. The Budokan headphones disrupted the trend by embracing the studio-style noise-isolated big-magnet headphones.
The Walkman itself was only slightly larger than a tape case, so this is where miniaturization was still shown off. Then there was essentially a bass boost function and a sort of equalizer, to shoot sound to your ears compensating for how your own head hears things. The breakthrough was having that much control over a basic mosphet circuit in a tiny, pocket sized device!
I could not afford this, at all!!!
But, my dad was an early dicta-phone adopter for his law practices. So I had access to a pretty good Sony tape recorder. My dad was friends with this neighbor since they were both carpenters - window/door gurus.
Anyhow, I got a little famous in the neighborhood for hounding all the adults around to borrow vinyl LP's to record to tape. I got caught dumpster diving on multiple occasions to recover discarded records.
So I became known for having this ridiculous tape collection, and known for dubbing copies for anyone who was interested. There was a cultural fountain flowing in my neighborhood at the time, all centered around music and motion picture.
So, the carpenter friend of my dad, he was a show off and always needed to tote the latest and greatest portable audio device... well the Compact Disc came to be, and so did the DAT... he bought into both... and suddenly the Budokan Walkman was like yesterday's crap to him.
Knowing I had this rediculous tape collection, by this time I recorded tons of radio, got pirate live sessions at flea markets, and so on... like my bedroom was just shelves of tapes - this carpenter gave me his Budokan Walkman and headphones. It was like the best thing ever!!!
It was also kind of finicky and started to have trouble... the auto-reverse would switch over mid-tape... probably my fault in a way because it really wasn't intended for 120 minute reels. I didn't know enough then to realized, high definition resolution was only achieved on 15-40 minute tapes - the Budokan motor wasn't very strong and wasn't designed for my cheap little pirate boy self!