They are definitely worth $30. They were THE moderate price high quality rock speaker back in the day.
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Get 'em. I have five pair. If you can find another pair and have a large room you can have stacked Advents connected in parallel for an awesome system. In the 70's my double Advents driven by a Kenwood integrated amp were very effective in helping me break a lease agreement for an apartment I wanted to move out of. I thought I might have overdone it when the apartment mgr looked like he might have a heart attack after sprinting across the complex on the way to my unit. Nothing like 4 10's in acoustic suspension for bass impact.