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I would try going into the menu settings on your receiver to make sure that the subwoofer is turned on or that the volume is turned up. If it is a powered subwoofer you can try hooking the output of a phone or an iPod to the input cable just to test and see if you are getting sound through the subwoofer. If that seems to be working ok then you know the problem lies with the receiver.
Quick test...with your Lanzar volume all the way down, connect MP3 player or other type audio source directly to the subwoofer input connection. Play audio and slowly increase volume control. If subwoofer is working using this method, reconnect and check for audio output to Lanzer connection problem, or subwoofer "settings" issues with the receiver.
As I implied earlier, take a clue from the physical style of connectors for both parts of the subwoofer function in the old and new receivers:
RCA connections are for Line Level signal between components only.
The input (bare wire) at the speaker is for AMPLIFIED signal.
You can't just modify one to fit the other and expect magic to happen. Be glad you didn't do it the other way around and modify an amplified (speaker level) outout into a Line Level input. You likely would have smoked that component.
Your subwoofer is a passive speaker, that is, like any other speaker it needs an amplifier. Many subs are self-powered (amp built-in) and they would mate well with the RCA sub output of the receiver.
Get yourself an Active (self-amplified) Subwoofer and run UN-MODIFIED RCA cables to it, according to its instructions, from the Sub Out of the receiver. Or get an amplifier between your receiver and the sub you have.
THIS UNIT HAS NO SUB WOOFER AMP IN IT. THE ONLY WAY TO OVER COME THIS IS TO HOOK THE LEFT AND RIGHT FRONT SPEAKERS STRAIGHT TO THE SUB WOOFER AND THEN GO FROM THE SUB WOOFER BACK TO THE INPUTS ON THE BACK OF THE UNIT FOR THE FRONT SPEAKERS. THE SUB WOOFER THIS WAY WILL EXTRACT THE BASS AND THE FRONT WILL RECEIVE THEIR PART. THIS SOUNDS CRAZY AS HELL I KNOW BUT THAT'S HOW I GOT MINE TO WORK. THE OUTPUT FOR THE SUBWOOFER IS USELESS AND PUT THERE FOR YOU TO HOOK UP AN AMP FOR A SUB WOOFER. EVERYTHING HAS SHORT COMINGS, AND THAT'S THE ONE FOR THE AX-720.
No way to connect it to your gaming system, unless you are good at rewiring things and even then it may not work right. It would be a tough job, but if you give me the model number I could send you the pinout of the din plug jack. You would then need a male din cable to connect into it and try to figure out which color wire goes to which pin. It can be done, but not to easy. You can't connect it to an amp, it has an amp in it. you would need to use it as your amp. Or just remove the amp section and go right into the speaker wires that plug into the amp board of the panasonic. If you want that information put your email address in the next post with the model of the sub-woofer.I will email what I have on it.
If I were you, I would sell it on ebay before trashing it. There may be somebody who needs one just like it. It can be used with a couple of different Panasonic models probably.
Stereo Tech: yes their is a fuse inside that possibly opened, but does the unit show PROTECT across the display? if not you may have goten lucky and just did a fuse small PC board just behind the transformer. Good Luck