Is dedicated PreAmp with Oppo 105 needed?


I think I've a decent HT setup but still feel there's something missing. I watch movies 70% & listen to music 30%.

Since Oppo provides pretty clean sound, wondering if upgrading to a dedicated PreAmp will make any difference. If it does, what would you recommend in say $1000-$2000 range? I intend to bypass the Video & connect straight to my Plasma on HDMI 1.4a.

Thank you!
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LRC Speakers: Tyler Acoustics Linbrook System II
Surround Speakers: JBL S312
Amplifier: Parasound Halo A51
BD:Oppo 105
Tape Deck: Nakamichi RX-505
Room: 16x18+ with some open area, so sound can bleed
hitsofmisses
I’ve shortlisted Atma-Sphere MP1 so far. Now I just need to be patient to find a good deal to come by. 
Another alternative would be a VAC preamp & preferably with HT Bypass. 

Apologies for reviving this old thread, but I was very interested in the Krell S1200 mod that Auxinput suggested. Unfortunately the links to the pictures of the mod are no longer working. Any chance of posting these somewhere again? Thanks!

Since I cannot post in message, try this link for the photos:

https://photos.app.goo.gl/cgWrZqVL6u1M791P9

hope that works.

At this point, I would use a single 10,000uf 50V Nichicon KW add-on for each of the three power supply sections.