DAK Industries Catalog, Early Fall 1985
archive.org
archive.org
For a still-contemporary comparison, Trader Joe’s still publishes a similar (but more condensed and less personal) story-per-item format catalog for its grocery offerings in its Fearless Flyer, which you can find at https://www.traderjoes.com/home/ff
Edit: Turns out it's on p.30 of this catalog.
I remember 808-style bass coming from a block away back then, not to mention my Radio Shack super-tweeters were the best I've ever heard then or since[1]. (Although to be fair I probably can't hear very high frequency any longer.)
That's how I look at DAK—happy memories, getting good stuff at a good price. With copywriting tips on the side. I even visited the storeroom in Canoga Park a couple of times.
[1] https://reverb.com/item/46585889-vintage-radio-shack-realist...
Tighter integration killed it mostly. Integrated amplifiers in speakers and your audio source already has an EQ and everything else you'd want all in one unit kinda takes the fun out of it.
[1] https://archive.org/details/products-that-think-01/page/n27/...
That "Symphonic Sorcerer" Casio SK-1 sampling keyboard is a legendary instrument. The first dirt cheap ($49.50?!) sampling keyboard (and synthesizer), it ended up being "used by Fatboy Slim, Beck, Autechre, Portishead, Bloodhound Gang, Nine Inch Nails, Incubus and Blur."[1]
One of the DAK signatures was buying other company's production line "mistakes", "fixing" them, and selling the result.
In this case, the original Thunder Lizard was another firm's speaker[2]. The mistake was that it assembled with the wrong (inferior) tweeter. DAK bought the mistakes, the correct tweeter, and sold them.
The Plus, iirc, was a follow up to this speaker.
[1] https://cabel.com/2023/11/06/dak-and-the-golden-age-of-gadge...
[2] Some model of BSR DR1550 series speaker, if web searches are correct.
Edited to add BSR info.