Polk RTI A3 crossover component identification.

Johnsizzle

Hi All,

I have a damaged crossover pcb and i am trying to source a replacement. Can anyone identify what this component is? The only markings on the side is 5V. Maybe someone has a schematic for this part?

Thanks in advance.

VR3

Are both speakers damaged? The other speaker if undamaged should have the values

Johnsizzle

I believe its 5W not V and I may found something that might work. Can any experts on here confirm this would work? https://www.digikey.ca/en/products/detail/yageo/SQM500JB-10R/9166584

SeleniumFalcon

I've asked a friend at Polk what the value is for R1 and R2, I believe the burned one is R2.

Johnsizzle

The burned one is R2. Thanks for checking on it it.

SeleniumFalcon

My friend is out of his office today, you could always look at the other speaker's crossover.

Johnsizzle

Copy that. Unfortunately the other speaker is not available to me at the moment. I might not get my hands on it until next week.

gp4jesus

Hope this helps:
R1 - 2.4
R2 - 5.7
C1 - 8.2
C2 - .47
C3 - 27
T: 2.4ohms, 8.2uf & .47
MW: 27uf, 5.7 ohms
If you need more resistor details, Tomorrow I may have time to pull a spare ‘A3 down from storage and pull the XO.

Tony

Johnsizzle

Thanks Tony. I am having trouble finding 5.7Ω. any chance that might be 4.7 rather than 5.7?

https://canada.newark.com/tt-electronics-international-resistive/cvw54r70jlf/wirewound-resistor-4-7-ohm-5w/dp/40M8834

Either way your assistance/input is much appreciated.

Clipdat

Post + Username

gp4jesus

Tomorrow I will try to make time.

My spare* ‘A3s* are kinda difficult to get to. I’ll post pics and a heartfelt “I’m sorry” if we learn that I fat-fingered the info years ago.

“T”

VR3

5.6 ohm

SeleniumFalcon

Johnsizzle

Thank seleniumfalcon, 5.7 it is. Seems like a hard one to find, I have found 5.6 https://www.digikey.ca/en/products/detail/ohmite/TWW5J5R6E/824555
would this be acceptable I wonder....

SeleniumFalcon

I think that would be a good choice.

SeleniumFalcon

I checked in my parts bin and I found a 5.7 ohm 5 watt resistor that I'd be happy to send you at no charge.

Johnsizzle

No way. That is super cool of you, I'll PM you my address and I'll try and do the same for someone down the road, what a great community. thanks again all

gp4jesus

I hope these help though I’m sorry for being a little late w/my “5.7” confirmation…

F1nut

Since you cooked the 5 watt resistor I'd suggest you replace it/them with a 10 or 12 watt version. Mills has a 5.6 ohm that will work.

gp4jesus

F1nut wrote: »

I'd suggest you replace it/them with a 10 or 12 watt version. Mills has a 5.6 ohm that will work.

Great idea Jesse 😊!

OP: Look at the pic I posted before Jesse. Find the yellow .47uf cap starring up at us mid/center pic. In the past I believe Jesse has suggested that cap blows rather easily and/or is the chief offender for the RTi A series speakers infamously “hot” top end. Feel free to correct me, Jesse. To that end he’s suggested either replacing* or de-soldering* one side of that cap.
*can’t recall which, though at .47uf, likely you won’t miss it’s ”nano level” positive contribution while greatly enjoying the softer top end.

Tony