Many years ago I initiated a regular column at Larry Clifton's MCS Review called DIY. It was about home built gear to further advance one's interest in audio & specifically quad. Also @par4ken
was a notable contributor to the column. The first article was how to build a power supply for other projects I had planned. Well, back then, if you couldn't buy it, you built it.
Taking an afternoons break from the forum I had a bit of an epiphany realized from this CD-4 thread: just about every damn thing about high quality home audio is DIY!
You do it your self when experimenting with best cables, room acoustics, setting up a turntable. You do it your self when ripping all that media to a NAS or whatever that you also set up your self. It's DIY when you take a stereo track & say, hmmm, how can I upmix this?
But it seems that CD-4 is the most DIY you can do without picking up a soldering gun. You're on your own making decisions about phono cart, turntable. Sure maybe there's some help from others but eventually it's back in someones hands making the most out of set up, adjustments, picking the best demodulator you can find & adjusting. And the most DIY of all with CD-4 is tracking down gremlins that defy explanation.
Some how I feel very good about this. In the bigger picture it's wonderful to have a passion that stimulates the mind, the hands, & our sense of achievement when we've finally made something work well.