Coonecting Subwoofer ofRM6750

Qak

Hi. I have a PolkAudio RM6750 5.1 speaker set. The manual mentions 2 different ways to connect the receiver's subout port to the subwoofer, as follows.

"Receivers that include a “Sub Out” feature—the most common hookup method with Dolby® Digital receivers.

NOTE: Use either the L or R Line input (another hookup option is to use a Y-split cable
and connect both L and R Line inputs). After you make this Sub Out connection, turn
the "Low Pass" filter fully clockwise."

Is there any advantage/disadvantage to only connecting to one input? I'd need to get a splitter cable, so I was just wondering if it would make a difference.

I did a search here first, and found this in another thread, does it apply to the RM6750 as well?

"There is an error in the PSW10 owner's manual, there isn't an LFE input on that model. However, that shouldn't be a problem. All you would need to do is connect the single sub-woofer output, of the receiver, to either the right or left input on the sub-woofer (the sub-woofer's bass amplifier adds the two channels together so a connection to either one is fine). Or, if you prefer, you may use a "Y" cable to provide a connection to both inputs on the sub-woofer. While this doesn't change the sound quality it will allow the sub-woofer to play louder at each of it's volume control positions."

Thanks for reading

Jim

kawizx9r

You answered your own question if your sub doesn't have a dedicated LFE input.

If it had both LFE and LINE IN (L/R), I'd most likely go with the LFE which bypasses the subwoofers internal crossover and let's you control the sub's cut-off by means of your receivers settings.

Since the PSW10 states that it combines both channels anyway, a y-cable won't be necessary.

Btw, welcome to CP

-Freddy

Qak

Thanks for the speedy reply. Sorry to be dense, but I'm still fuzzy. The RM6750 doesn't have the LFE input, so I need to use the the L/R inputs. I answered my own question, in that connecting to both L and R inputs will allow the sub to play louder? I only quoted the PSW10 because the other thread mentioned the Y splitter cable, same as the RM6750's manual. I don't know if the 6750 combines both channels or not, so I'm still unsure if a Y cable will be better. Sorry for my noobishness, and thanks for the welcome


Jim (He of the Tin Ear)

[Deleted User]

Hey Jim,
Let me welcome you to Polk's Forum, the RM6750 is probably Polk's most popular speaker system. The important thing for you to do is enable the sub to play up to 150Hz in frequency. This is necessary because the front right and left satellites have a built in filter preventing them from playing sounds below 150Hz.
You'll want to go into the receiver's setup instructions and raise the sub-out crossover frequency to 150Hz. This should be covered in the receiver's owner's manual.
Doing this will provide a smooth blending from the sub to the front speakers.
Cheers, Ken

Qak

Thanks Ken. I had read about the setup options in the Yahama receiver's manual, but didn't know the correct value for the 6750. You just saved me a from a future posting, after pulling out some more hair. My original question still stands though, should I get a Y splitter cable to connect to both the L and R inputs, or is it not necessary at all? :rolleyes:

[Deleted User]

Hello,
There really isn't a need to use a Y connector when connecting a sub-out connection from the receiver. The input, of the sub-woofer, would divide the incoming voltage in half if you used a Y connector. Then the sub-woofer would combine the two halves together giving the same result as if either the right or left input were used.
Cheers, Ken

Qak

Aha, thanks a lot for the info. You guys are both speedy and helpful, and it's much appreciated.

Enjoy your weekends

Jim

[Deleted User]

You too, Jim...!