Onkyo tx sr503 No Output from Subwoofer pre-out. Have hooked up oscillator to cable out; subwoofer works fine. Measured output from sub rca output--o vac . Tried it with double bass on and off. Subwooter set to 'yes'. Is there any hope? Thanks in advance. Michael Winn

See Onkyo manual here: http://filedepot.onkyousa.com/Files/own_manuals/TX-NR626_English.pdf

Insignia manual:
http://audio.manualsonline.com/manuals/mfg/insignia/nsht51.html?p=1

Best hookup method for sub is to use the LINE LEVEL INPUT on the Insignia, wired with RCA cables to the Subwoofer Pre Out jacks on the Onkyo

Get a RCA cable and connect from your amp where it said Sub Woofer in the Pre Out box in the back of the amplifier top left hand side and take it to the "Sub In" located in the back of your Sub woofer bottom right hand (White round connector).
Good Luck!

any size your room can handle. The 503 has a pre amp output for a subwoofer, meaning the receiver/amp doesn't power the subwoofer. Most home theater subwoofers are powered, meaning they are a combo sub, amp.
The size of the subwoofer should be determined by room size, and space restrictions where it is going.

If you receiver has tape monitor outputs, you can hook the sub up to those.

The subwoofer has its own RCA output on the back of the receiver and needs to be plugged by RCA cable from the receiver to the sub. This would be for an "active subwoofer" with its own amplifier and crossover that needs to be plugged into the wall.

It sounds like you're doing everything right. Did you define the sub to the Onkyo (Subwoofer = Yes, page 22)?

Let's prove the sub works. Set its volume about half-way, cutoff= 170Hz. Temporarily connect an RCA cable from its Line Input to one of the Tape Out connectors on the Onkyo and play some FM through it. If it's alive you'll hear the low end of the music.

Don't buy into the hype that there are different pedigrees of RCA (or speaker) cables that will make an audible difference. Save your money.

The problem was that some subwoofers (inluding my velodyne model) cannot process the LFE signals through the line level inputs on its amps, so the other way to run your subwoofer is to run the front left and right speaker outputs from your receiver to the speaker-level inputs on your sub, and then plug your front and left speakers into the soeaker level outputs on the sub. you have to set the onkyo receiver to "Subwoofer: No". that way the LFE signals are sent through the front speaker channels and you will get the same BASS output as if using the line-level input. O So yes it does require a bit more speaker cable, but it works fine now.

I believe the sub output that uses a RCA plug is not amplified and wouldn't work in your case.

Talked to tech support at Onkyo and there seems to be two (2) places you can hook your sub up to. I placed mine in the wrong slot. So please double check where you placed the sub connection.

May not necessarily be the out put, discontect the sub from the receiver and see if it still makes a hum, Making sure that you turn auto on, off on the sub woffer.
If it still makes a hum, then you have a earthing problem, you can get a earth filter put on your internal wiring in your home, or you can remove the earth pin on your sub woffer