Do I even need a dedicated stereo preamp?


Hi everybody, I'm new here. Been a lurker for a long time. 

My current system is dual purpose for music and HT. However over time, I have added dedicated pieces of equipment for the music side. The only standalone piece I do not have is a preamp. Here is my current setup. 

AVR: Anthem MRX 540

AMP: Buckeye Purifi 1ET6525SA 2 channel   

STREAMER: Eversolo DMP-A6 Gen 2

DAC: Holo Audio Cyan 2

So far I am incredibly happy with my setup. However, a part of me wonders if I would gain any sonic benefit from a dedicated preamp.  

I want to just full send it, but money is tight and I want to make sure I would truly have something to gain. That's why I am here asking all of you guys. If money wasn't an issue, I've been looking into Benchmark LA4 or the Holo Audio Serene. Another issue for me is I have gotten so used to using the Anthem phone app to adjust the volume say if I'm in my kitchen. I know I would lose that functionality.  

So from those more experienced than me, will I hear a noticeable difference between the preamp in the Anthem AVR vs a dedicated preamp? 

Thanks

musical404

I want to thank everybody for their input. For now, I've decided that I am content as of now. Thanks to everyone, I know what direction I want to go should I decide to get a dedicated preamp. 

I went without a pre for several years, convinced of the absurdity of it. At the same time, I did not like the sound, and was looking at cabling, new amp, sub, power issues, etc. I finally bought a pre amp. Problems solved. I now regret the wasted years without the pre amp.

Every pre amp I have had has changed the sound.  I still have a AR LS-15, paired with a Bryston 3b-NRB in my wife art studio. She paints daily, loves it. 
Before that I had a Bryston .5B preamp, which is not great, but, it still works and is moving onto 30 or more years of age. Bryston. Quality build. 
I currently use a ML 326S preamp, which is fantastic. Completely different sound as compared to the LS-15, tube warmth, less crisp. I personally prefer the 326S.
My DAC is a T+A DAC 8 DSD. It can double as a preamp if I want it to. It has 4 spdif inputs, Optical, BNC, USB and AES inputs.Digital volume control. Terrific DAC. It has a totally different, almost clinical sound as compared to anything else I own. 
My Yamaha surround sound receiver, 7.1, all Paradigm system, does not even come close to any 2 channel I own.  
Do you need a preamp, no, but, can you tailor the sound, yes. So much personal preference out there.  
Get on Canuck Audio Mart, and be blown away at what is for sale, slightly used.