Headphone Jack Not Disengaging Speakers?


I have a NAD C 326 BEE integrated amp. When I put my headphones into the jack the speakers still play. 
I don't think this is normal, am I not doing something right? I know that there is no speaker output defeat switch so I think this may be a design flaw or it needs repair.  
I do have the integrated passing through to a tube amp so I can simple just not turn on the amp for headphone listening, however I still find it annoying. Also if I decide to sell it I want to be sure in in proper working order. Any thoughts would be welcome.
Thanks! 
borzetta

Showing 1 response by borzetta

Thank you both for your reposes and suggestions. I will definitely give that I try!