Onkyo 705 and RM6880 Subwoofer

newbie101

I found some answers on the forum already but I still cannot find my specific question answered.
From the forum and the Onkyo Manual I know that there is only one pre-out for the subwoofer in which I have place a RCA cable. I then placed the cable into the left (white) jack of the subwoofer. As I connect I get the subwoofer hum confirming at least that the subwoofer has power. The I go to the speaker set-up module on the Onkyo 705 and go to level calibration (I had already tried the Audyssey set-up and there was no ping to the subwoofer but there was to the other 5 speakers) I got white noise from all the connected speakers but the subwoofer. This is a THX speaker set-up and the THX subwoofer is set to 80THX. I was able to previously calibrate a SR605 using the RCA out from the Onkyo but it was not a THX setup. All connections have been tested for proper seating---Thanks for any help---There is no LFE input on this speaker. 101

VSchneider

Are you sure in the receiver speaker config the sub is set to Yes, and front speakers to Small?

newbie101

Subwoofer is set to yes
Front speakers are set to THX80hz which I understand is small.
No sound!

jakelm

Check where you plugged in the sub. Make sure its not left "out", but left in. Buzzing sub comes from no ground at input. Make sure its the input on the sub you have hooked up and the sub out on the AVR.

If this is all correct, then change the rca wire out with another one. Doesnt matter what brand the other one is.


Welcome to Polk.

crd2002

call the onkyo 800 number they will help you troubleshoot

newbie101

Thanks but so far nothing seems to help, The Receivder has only RCA sub-woofer out and the subwoofer has 2 rca's in (red and white). I changed rca's and have the RCA in the Receiver pre-out and the sub-woofer white input---I also tried the red---I have not tried a splitter, so that both red and white subwoofer inputs are filled, Thanks for the efforts so far.

John K.

101, welcome. Although you've already said twice that you're plugged into the sub "out" (and you were successful with the 605), take a very close look at the back of the 705 so that you're certain that you're plugged into the sub out in the pre-out section a little to the right of center and not the sub input in the DVD section which is about 3" to the left. Plugging into the input instead happens surprisingly often.

If that's not the problem, temporarily disconnect one of your main speakers and connect the speaker wire to the sub instead(disconnect the sub coaxial cable)as if it was a main speaker. Turn the frequency control on the sub all the way up and play something that has significant bass to check if the sub amp is in fact working(the hum alone doesn't establish that).

newbie101

Thanks John K. I check this tonite and see, post the results later