Connect optical/digital audio out on TV to pre-amp or DAC?

ymc226,
     I own the Oppo 105 and it's an excellent Blu-ray player but I wouldn't suggest it if you're planning on getting a 4K OLED in the near future since it's only 1080p.  I think your best bet is to try to find out if Panasonic or Pioneer are coming out with some new high end models that are 4K, have a built in 7.1 surround sound processor with analog 7.1 ch outputs and a built in 4K video processor.

Tim

@ymc226 

Both Oppo 105/205 & the Pioneer Elite UDP LX500 are overall better quality players than the Panasonic DP UB9000 with superior DACs, DAC implementation & configuration, power supplies, analog audio output stages, disc transport mechanism (disc drive), better overall internal design topology architectures. 
Both Oppo 105/205 & the Pioneer Elite UDP LX500 will give you better sound when using analog audio out, but the Pioneer Elite UDP LX500 lacks multi-channel analog audio outs. This Pioneer Elite UDP LX500 & the Oppo 205 also provide spectacular top notch picture qualities, probably the best in comparison to other 4K UHD bluray players out there. 

Your best bet would be the Oppo 205 since it has multi-channel analog audio outs and plays 4K UHD discs and the sound and picture qualities are phenomenal for all kinds of movie playbacks (4K, bluray & DVD video disc playbacks). However, the Oppo 205 are no longer made although you can find one online but are being offered at 3x its original MSRP of $1300 when it was still in productions. It's insane. 

Hello caphill,

     You have a very good understanding of all the better quality 4K Blu-ray players being discussed.  I completely agree with you that the Oppo 205 is the best overall (video and audio) 4K player solution but, at 3x its original MSRP of $1,300 they're presently prohibitively expensive due to Oppo's withdrawal from the player market.
     I believe an ideal new 4K player that's as good would need to combine the high quality of the Panasonic DP-UB9000's video performance and multi-channel analog audio outputs with the Pioneer Elite UDP LX500's high quality audio performance and universal disc capability.  And, ideally, this Oppo 205 clone would have an MSRP as close to $1,300 as possible, although I know I and probably many others would willingly pay about double that price. 
      I currently use an Oppo 105 as the centerpiece of my streamlined system and thoroughly understand the high quality audio/video performance and exceptionally high number of important functions the top model Oppos are capable of.  
     I currently use my 105 as a preamp, a hi-res DAC up to 24 bit/192KHz resolution (I don't even currently utilize its DSD capacity) interconnected via wi-fi to a laptop and 2 TB NAS for a computer audio system, a HT preamp processor for decoding 5.1 surround sound channels outputted directly to multiple amps through its analog audio xlr and rca outputs as well as a universal disc player for Bluray and DVD video discs and CD/SACD/DVD-A audio discs.  I'll just have a need for a 4K Oppo 205  universal disc player or alternative once my 65" 1080p Panasonic plasma hdtv needs replacing, hopefully, many years from now.  I can wait at least a few years for a high quality 4K universal disc player with 5.1 or 7.1 analog surround and stereo audio outputs to come out. 
     For ymc226's situation, I believe his McIntosh MX-135 preamp-processor will continue to prove to be more of a system hindrance than a solution mainly due to its lack of HDMI inputs.  It was a big,impressive and competent prepro in its day but it's a new day and the future of audio/video is fairly clear.  If he doesn't have other components attached to it like a TT, and perhaps even if he does, I'd definitely advise selling it while it still has some value.  
     If he wants a 4K universal disc player immediately, I'd suggest buying a new or used prepro that accepts HDMI inputs for audio (there's no need to buy one that performs video processing), buy the Pioneer EliteUDP-LX500 and attach its HDMI video output to your 4K hdtv and the HDMI audio output to your upgraded prepro.

Tim

@ymc226

I agree with noble100 aka Tim. You will need to get rid of your old obsolete McIntosh MX135 processor. I know its resale value is worthless now.

You will need to get a more current HDMI equipped processor that supports 4K & latest HDR, Dolby Vision on the video side of thing since you are considering to purchase a brand new 4K OLED TV. And you said earlier that you also have a cable TV DVR box which you will want to eventually upgrade to the 4K capable one once you get the new 4K OLED TV. So you would want to buy a HT processor that supports 4K and its latest version of HDR & Dolby Vision. There are countless options out there. Anthem AVM60 & Marantz AV8805 are two great options and both are inexpensive and both support 4K & latest HDR, etc.

Once you get a new processor you can just connect your 4K capable cable TV DVR box & your new 4K bluray player using HDMI to a new processor for both audio & video. In this scenario you can just get a new Sony ES1000 4K bluray player, which is Sony’s flagship ES line, or the Pioneer Elite UDP LX 500 4K bluray player or the Panasonic DP UB-9000 4K bluray player and connect using HDMI to a new processor for both audio & video. All these three 4K bluray players are awesome. The Pioneer Elite UDP LX 500 will be the best option of all three. The UDP LX 500 is probably even better than the Oppo 203/205 when connected using HDMI outputs, possibly better picture quality than the Oppo 205/203 when using HDMI outputs.

In today’s AV world, everything or all AV source components and AV processors are all connected via HDMI.