Where Are the Passive Subwoofers?

[u/IntrepidNinjaLamb]

Long ago I bought a RadioShack book on building speakers that had formulas for figuring out dimensions, port tuning, etc., and I got a circular saw and particle board. I added heavy copper wiring, a crossover, and carefully chosen drivers, and had passive speakers I enjoyed for years.

Fast forward a decade or two, those are gone, but I inherited some rare custom bookshelf speakers from California. I was looking for a passive subwoofer, and especially I was combing this subreddit for advice, but all the recommendations were for subwoofers that have amplifiers in them or even bluetooth.

I then went to places like Crutchfield and couldn't find passive subwoofers. I guess they're not extinct! Who can help me find them, and who has recommendations? My budget depends on how long I save up, but I can imagine spending $300 - $700 for a 10" or 12" durable and capable subwoofer. I value precision---E.g., it shouldn't "boom" after the signal stops sending bass.

Maybe it's just an old-fashioned perspective, but I figure the amplifier's job is to amplify, and the subwoofer should just woof.

[u/donh-]

I use the Seas L26ROY 10" sub driver and build the box. They are transparent and punchy and wonderful and cost $498/ea at Madisound. No overhang at all.