Suggestions on Pre Amp/Amp or Integrated Amp

5K for mostly movies? Hasn't been invented yet. I would ask a home theater forum. This is a hifi board.

Yeah if it’s mostly for more power/better bass you could just get a more powerful stereo amp and hook it to the front L/R pre outs on the Marantz as the NR1510 is underpowered for your CM8s.  You have a decent sub, and if you haven’t already done so you might look into optimizing its settings/positioning to make sure you’re getting the most out of it.  If you have a large room you might also consider adding a second sub, which has many benefits.  Best of luck. 

Thank you all for your suggestions!

I’m a new member but have been following these directions for years in an attempt to stay current on equipment, reviews and suggestions for my home theater. Due to somewhat advanced years and a spouse that doesn’t really like all the effects that a good home theater system can provide I decommissioned my system last summer and replaced it with a Nakamichi soundbar. I have given away my speakers and kept my Oppo and Panasonic region free 4k players but still have my Anthem 8k MRX 740. I’ve never sold anything on the internet before but have started to look at eBay and others. I will price the Anthem aggressively for the right buyer. Let me know if you’re interested.

I’m a new member but have been following these discussions for years in an attempt to stay current on equipment, reviews and suggestions for my home theater. Due to somewhat advanced years and a spouse that doesn’t really like all the effects that a good home theater system can provide I decommissioned my system last summer and replaced it with a Nakamichi soundbar. I have given away my speakers and kept my Oppo and Panasonic region free 4k players but still have my Anthem 8k MRX 740. I’ve never sold anything on the internet before but have started to look at eBay and others. I will price the Anthem aggressively for the right buyer. Let me know if you’re interested.