Has anyone used a Denon dm39 for stereo with two subwoofers? I have a Wharefdale 150 subwoofer and was thinking of buying another to boost the bass. On the one I have I use Accoustic 2020! speakers with the crossover at it's highest.and the other controls/settings set properly but I am not happy with the bass. I use the subwoofer on my Yamaha 5.1 receiver which has 5 different speakers and I am happy with the bass using the TV which would indicate to me that the subwoofer set up is fine but not for the stereo. The Denon has only one subwoofer out put so would I have to link the two subwoofers together rather than two leads from the Denon? TIA