That really surprises me! I always liked them a lot, one of the great budget speakers, and one that is genuinely a ‘bookshelf’ speaker, i.e. that is where they sound good. The preceding AR range, the AR6 etc, were nicer with real veneer cabs rather than the vinyl-wrap crap and I think sounded rather better as a result, but the 18s were great for an entry-level speaker with a big bold punchy sound. Trevor Horn’s speaker of choice for mix-down, so all the ZTT label stuff was done that way!
The 8” paper driver in a sealed box is another genre sadly consigned to history. I’d take a pair over a lot of todays small plastic-driver ported MDF boxes for sure.
PS This isn’t failing audio memories either, Rob played me a set of 18s he’d refoamed a couple of years back and they had exactly the big, bold, punchy sound I remembered. A great fun speaker.