inputs.text: awesome replacehement old phase tech pc80s - seen many discussions forums hard repair damaged phase tech pc80 foam surrounds actually tried found standard replacement surround little large probably could jerryrigged place decided try woofers running simulations 12 replacement candidates flattest response candidates proof finished productthey require modifications cabinets worth babies rock completing modifications breaking able provide much cleaner deep bass original woofers ran slow signal sweep several pointed signals 20 50 100 1k 15k 2k 25k 3k hz found not mated crossover properly 25k also still audible 20hz albeit half level still got signal sweep sounded flat 49 hz woofer cut 25k remained flat no loss crossover neighbors dogs could hear telling turn fun stuff actual music cds pink floyd dark side moon rick lee jones albums eagles long run reo speedwagon hiinfidelity blues brothers showing age herefor appreciate fine cabinetry pc80s lamenting throwing away modification details photos also note not need modify port 2 18 x 6 14 even though many software simulators tell otherwise youyou need make ring 18 mdf fill original woofers recessed inner part ring 18 larger diameter existing hole 116 larger radius spraypainted several coats black semigloss little shinier veneer made sure seal good used 5 minute epoxy glue placenext needed modify negative black spade connector 18 fit peerless negative terminalscenter speakers flat sides vertical used combination square make sure truly vertical pilot screw holes connect woofer screw used short sheetrock screws come good seal material not need provide unless really want make sure sealedthe grills need modified since bottom one side speaker not allow put grill tight easy dremel tool tile cutting attachment comes 3000 set make sure protect grill cloth used heavy shop towels center circles 18 mdf rings took 18 x 18 notice pattern grove bottom side little wider clean use sticky roller grandma used use clean sunday best slightly damp wash cloth tack remaining dusti hope helps broken pc80s others looking great vented small box wooferi photos could not find add look parts express site review photos