These speakers sound excellent, they’re very heavy, and well-built, with solid oak for the tops and bottoms. They were re-foamed fairly recently. I do not believe the cross-overs need rebuilding at this time – they’re clear and precise at all frequencies, and the bass is very good. Only issues to mention – one of the dust caps has cracked off partially on one woofer (see picture). And, I do not have the grilles, but in my opinion, they look much better without them. The TSW-510 is a 3-way sealed (acoustic suspension) tower speaker from around the late 1980s. Specs from a vintage brochure: 10? Woofer, 6.5? Midrange, ¾? Titanium dome liquid-cooled tweeter with acoustic lens. Frequency response of about 44 Hz to 40,000 Hz at -3dB. Power range 15-150 W. Build quality / finishing: The model is noted to have solid hardwood top and base panels, black vinyl laminate cabinet, felt around mid/tweeter for acoustic diffraction control, hefty design. Sound impressions: One owner notes the midrange is very clear, “more like listening to live music than a speaker system, ” highs are detailed/open/airy, lows go deep without sounding boomy. Verdict & Use-Case Thoughts. If I were summarizing: This is a very good vintage high-fidelity speaker for its era, with excellent build and strong sound potential – particularly if you get a pair in good condition or are willing to invest in refurbishment. If paired with a capable amplifier and decent setup, you could get very satisfying results. However: They’re best suited for someone comfortable with vintage gear, possibly doing some maintenance (driver checks, possibly re-foaming, ensuring the amp can drive 4?? loads), and who has the space (and likes the aesthetics) of older-style towers.