I agree. There's not much we can do if you don't disclose the name of the processor. HT Processors nowadays are usually somewhat complex to setup. The EQ function can be challenging to work with. It sound like the unit has a fully parametric EQ/filter mechanism. This really requires in depth knowledge of acoustics and frequency response. It may be that you need somebody with RTA software, such as Room EQ Wizard (REW), to measure what each channel is doing.
That being said, if you're not getting good sound out of it, then a few possibilities:
1. The unit is brand new and needs to be broken in (burn in of all electrical components). Give it 100-200 hours of constant running before making a decision. Since the unit is fresh, it could sound bright/harsh/thin and without bass. It can go through many changes during break-in.
2. The unit could just be poorly designed. I have actually had a couple very expensive processors in my system that just could not cut the mustard (contrary to many other opinions). One was a Theta Casablanca IV, which was very expensive and came with Dirac room correction. I just could not get it to sound good - it was very bright/solid-state/sterile sounding and just did not even come close to sounding as good as my very old Krell HTS 7.1 (the Krell just sang!). The other was the Bryston SP3, which I could appreciate, but was too laid back in the mids/early highs to be exciting and engaging enough. I think the Bryston had a poorly designed DAC/digital board (they used a generic off-the-shelf DAC/DSP board solution).
3. The new HT Processor sound could just not be the type of sound you're looking for.
What processor did you use before?