Can I replace the stock power cord on my Marantz PM-11S1 integrated amp. with a new high end power cord ?

Question edited for its proper name and model designation.
Question moved from Cars and Trucks to a Marantz category.

Check fuses. Take it in for repair.

https://www.google.com/search?q=marantz+sr6006+subwoofer+connection

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The speakers are 8ohms. Always try using speakers 6 or 4ohms. For B&W 683 on PM 6004 is too low. You should go for PM 7000 or 8000 series to catchup with 683. Also when you increase the volume please decrease the bass as well.
You need 8ohm 55w to 90w or 4ohm 80w to 110w speakers.

You, sir, are a rare adherent to stereo-only electronics. Are you replacing it for cause (showing its age)? The PM7003 is only 2 x 70 watts like the JVC but it also has separable preamp/amps so you COULD upgrade or augment the power output with external amps and still control it all locally.

Of course, any current AVR's do that too and bring digital sources and multichannel audio to the mix for as little as the PM7703 may cost.

hi,
just purchase a lance cleaning cd. It will be available in cd shops. insert it in the player. it will clean the lance. after cleaning insert the hybrid SACDs and watch is it reading. If not then the laser pickup unit of you player have some problem. You have to relapse the same.
ok

I have exactly this same problem with my Marantz PM60100SE - one of the channels seems to have lost power and is much much quieter than the other one.

Did you find a solution to this? Anyone have any ideas?

You have either lost the pre-amp stage or the Main Amp stage. Since you have a problem on both channels it most be a part that is common to both channels. Something like an IC I would suspect.

HI...
You need an 8 ohm stereo "L-pad"
Try partsexpress.com
or
mcmelectronics.com

May be the problem solved here :
http://www.audiotoolers.com/ubbt/ubbthreads.php/ubb/showflat/Number/5316/page/1#Post5316

look on the back of the TV and there should be L/R audio outputs (white & red), connect this to a spare input of your amp via a connecting lead eg. AUX or any other input except PHONO.

hope this helps.

please disconnect loudspeaker one by one until the problem is goen -and fix the bad one by change the cabel first and the speaker second if all above does not solve the problem send your amp to service center to repair.