POLK LS90 crossovers Two different ones?
Can someone explain the why, when and what of Polk LS 90 crossovers? I understand there are two different ones? Thanks
Comments
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Falls falls under, "Specifications May Change Without Notice". I guess you are referring to the "Original" 1992 and the "Revised" 1993 schematics. Looks like they went from electolytic to mylar on the C1, increased R1 from 0.8 to 1.0 ohms and decreased L3 from 4 mH to 1 mH. I assume that the later is an improvement.Stan
Main 2ch:
Polk LSi15 (DB840 upgrade), Parasound: P/LD-1100, HCA-1000A; Denon: DVD-2910, DRM-800A; Benchmark DAC1, Monster HTS3600-MKII, Grado SR-225i; Technics SL-J2, Parasound PPH-100.
HT:
Marantz SR7010, Polk: RTA11TL (RDO198-1, XO and Damping Upgrades), S4, CS250, PSW110 , Marantz UD5005, Pioneer PL-530, Panasonic TC-P42S60
Other stuff:
Denon: DRA-835R, AVR-888, DCD-660, DRM-700A, DRR-780; Polk: S8, Monitor 5A, 5B, TSi100, RM7, PSW10 (DXi104 upgrade); Pioneer: CT-6R; Onkyo CP-1046F; Ortofon OM5E, Marantz: PM5004, CD5004, CDR-615; Parasound C/PT-600, HCA-800ii, Sony CDP-650ESD, Technics SA 5070, B&W DM601 -
OK What would that do?
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Looks like mine are 10/92 What did these changes do soundwise??
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maybe smooth out the midrange to upper freq. response between driver and tweeter?
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Replacing the electrolytic for the mylar capacitor usually gives very nice improvements to the highs in terms of smoothness and sound stage. Increasing the resistance would tone down the tweeter slightly. The change in the inductor would shift the cut-off frequency of woofer 3&4 down a little.
I would rest on the assumption that it is an improvement in the sound character of the speaker. Otherwise there would be no reason for the change as the replacement parts would cost slightly more.Stan
Main 2ch:
Polk LSi15 (DB840 upgrade), Parasound: P/LD-1100, HCA-1000A; Denon: DVD-2910, DRM-800A; Benchmark DAC1, Monster HTS3600-MKII, Grado SR-225i; Technics SL-J2, Parasound PPH-100.
HT:
Marantz SR7010, Polk: RTA11TL (RDO198-1, XO and Damping Upgrades), S4, CS250, PSW110 , Marantz UD5005, Pioneer PL-530, Panasonic TC-P42S60
Other stuff:
Denon: DRA-835R, AVR-888, DCD-660, DRM-700A, DRR-780; Polk: S8, Monitor 5A, 5B, TSi100, RM7, PSW10 (DXi104 upgrade); Pioneer: CT-6R; Onkyo CP-1046F; Ortofon OM5E, Marantz: PM5004, CD5004, CDR-615; Parasound C/PT-600, HCA-800ii, Sony CDP-650ESD, Technics SA 5070, B&W DM601 -
Sounds right! Does anyone know where to get the updated mylar crossovers?
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Sounds right! Does anyone know where to get the updated mylar crossovers?
It is better to use good quality Polypropylene caps instead of mylar. These speakers are LONG out of production. Anything now would be you changing out caps for better caps that would not have been used by Polk due to cost constraints.
