Polk Monitor 60 Series II bad crossover advice
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jonconnellnyc
Posts: 1
Greetings.
Situation: Very happy Polk Monitor 60 Series II - and complete Polk 5 speaker HT setup. Love them. Must be almost 18 years of music and movies. Last month my left speaker started to sound 'off' - turns out I have two dead speakers in the middle of the cabinet (mid / bass whatever you call those stacked center drivers). Cabinet S/N AM609205895
Tiny bit of high mid spill popping through rarely but basically no sound.
I am an EE - my bet is that this is due to a capacitor giving up. No way I lost two drivers- unless they are in series maybe? Nah. Not surprising after almost twenty years of unreasonable work - I am impressed anyway. I stand to be corrected.
I haven't pulled the crossover PCB yet but I can see the general layout in other posts.
Question: Is there a schematic for those crossovers please? - or a BOM - P/N and spec for those caps? Something NP and special I am quite sure.
I can handle the replacement comfortably -- have a full lab here. I used to wind crossovers for Celestion over in the UK the late 70s / early 80s btw.
Any advice appreciated - I don't want to ruin all your design work!
Thanks
J Connell, Seattle, WA
Situation: Very happy Polk Monitor 60 Series II - and complete Polk 5 speaker HT setup. Love them. Must be almost 18 years of music and movies. Last month my left speaker started to sound 'off' - turns out I have two dead speakers in the middle of the cabinet (mid / bass whatever you call those stacked center drivers). Cabinet S/N AM609205895
Tiny bit of high mid spill popping through rarely but basically no sound.
I am an EE - my bet is that this is due to a capacitor giving up. No way I lost two drivers- unless they are in series maybe? Nah. Not surprising after almost twenty years of unreasonable work - I am impressed anyway. I stand to be corrected.
I haven't pulled the crossover PCB yet but I can see the general layout in other posts.
Question: Is there a schematic for those crossovers please? - or a BOM - P/N and spec for those caps? Something NP and special I am quite sure.
I can handle the replacement comfortably -- have a full lab here. I used to wind crossovers for Celestion over in the UK the late 70s / early 80s btw.
Any advice appreciated - I don't want to ruin all your design work!
Thanks
J Connell, Seattle, WA
Answers
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Welcome aboard, best to pull the XO and get the values of the components off the board.
Most of the schematics are posted in the crossover section, yours, I did not see. -
Nope, basic components.Something NP and special I am quite sure.
These are poor photos (not mine) of the Monitor 60, which I'm sure is extremely similar to your model.
Political Correctness'.........defined
"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."
President of Club Polk
