Onkyo Subwoofer Pre Out Problem

You need a RCA sub-woofer cable (analog mono) to connect between the receiver's sub-woofer Pre Out and the sub-woofer. This cable has a single RCA plug at each end of the cable. The cable is somewhat thicker than some audio RCA cables. You can use any RCA cable temporarily.

The manual for the HT-R758 is available from Onkyo here: https://onkyousa.com/ht-r758 . The current link to the manual is https://assets.onkyo-av.com/product-manuals/HT-S6500_English_2022-11-02-204020_ivkn.pdf?v=1667421620 . See page EN-13 (page 13 of the PDF) for connecting to the subwoofer. The original package came with a 10' RCA sub-woofer cable, see page EN-1 (page 81 of the PDF) for the speaker list.

I hope this helps.

Cindy Wells

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!

It would be helpful to know if this is a new problem on working equipment or a new problem on NEW equipment. And if you've flipped through the manual without success.

Of course you KNOW the sub must have its own amp, right?

First, you need to determine if the Onkyo or the unnamed sub is at fault.

Register and download the manual for free at retrevo.com

http://www.retrevo.com/support/Onkyo-TX-SR608-Receivers-manual/id/23653ag916/t/2/

At the Onkyo, check to make sure you have run the speaker setup starting on Page 40. If that doesn't work...

Disconnect the subwoofer pre-out at the Onkyo and move it to the VCR Out, tune an FM station and be ready for some real loud subwoofer output if your sub has no volume control of its own. If you can hear the sub, it works and it's back to the Onkyo. If not, the unnamed sub

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.

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.

Greg- Powered subs are better than non-powered subs (also known as passive subs), anyway I see the TX-8511 has no sub pre-out on the back panel, so you need to decide what sub you will use and run from the receivers left and right speakers output into a subwoofers speaker in from speakers then back out to speakers, look at the back of a subwoofer and you will see like 4 sets of speaker hookups 2 in and 2 out, what this does is takes the low end or bass and drops the signal to the subwoofer then takes the mids and highs out to your left and right speakers, unless your regular left and right stereo speakers have large woofers a sub is the way to go.

Have you connected the Subwoofer out to the "Pre-out Subwoofer" on the left bottom corner jack(looking from the back)?

Have you set subwoofer out in the menu(under speaker settings or similar menu you will find all the channels that you have connected and here you should have "YES" for the subwoofer)?

HTH

Turned out to be a level problem.

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