No signal on subwoofer out in Onkyo TX-SR703(E) - similar to TX-SR803

You don't. It only supports a powered subwoofer. Item 24 on page 11 and page 22.

http://www.retrevo.com/support/Onkyo-TX-SR602-Receivers-manual/id/365ag211/t/2/

Sorry but this receiver has no HDMI inputs or outputs. I believe you have to step up to the TX-SR803 before you get any HDMI capabilities. Good luck.

Cleared all AV settings and reprogrammed.

Connect HDMI cable from the rear panel of the blu ray player to the DVD/IN digital section, labeled as "HDMI/IN" on the rear panel of the receiver.

The surround processing portion of the unit has a problem. In either stereo or direct mode, the digital procesing is bypassed. This could be just the surround processing IC, but that IC may not be available as a separate part. I would suggest that you bring this unit to an authorized Onkyo service center for an estimate.

Dan

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

Well the next step would be to make sure that all the settings are set to subwoofer yes, and set your crossover as well.  The amp usually has a crossover which tells the microprocessor which frequencys to send to the sub.  

a single male rca spliting into 2 male rca's ....a signal splitter

HI,run speaker cables from "b" speakers out put to speaker in puts on the sub and switch "b" speakers on on the amp.

hope this helps.
CABLE GUY.