The HLCompact from 1987 will likely not have the Radial driver which is at the core of what makes Harbeth's such a great speaker. I would look for a later model that has this driver. I had an early pair of Compact 7's from the mid-1990s which were, I believe, the first to use the Radial cone.
Harbeth HL Compact
There's a pair of Vinatge Harbeth HL Compact from 1987 for sale near me for $800.00 OBO I can't really find a whole lot of info on them except for the fact they're the predecessor of the 7ess (lots of info on those) Has anyone heard these and is this a good price for them They seem to be in very good condition.
Thanks