30 foot long Balanced Cables to Balanced/RCA Adapters into Amp's Stereo RCA inputs?

Multiple posts here say balanced must be fully balanced or there is little or no benefit.  I agree.  Don't waste the extra $$$ on expensive balanced  cables if all your components are not fully balanced.  30ft is a long run and you will have SQ losses running not fully balanced.

I see the OPPO retails at $1199.
So I guess a good used one is around $600.

If you really want to use it in two rooms 30ft apart why have the inconvenience of moving between rooms to access it and the cost of 60ft of decent cable.  Just buy a second OPPO.

Not a bad idea clearthinker, but the losses with the right cables are not the bad, he might lose 1 dB at 20 kHz which many of us can not hear anyway. Before balanced ins and outs became popular those of us with amps behind our speakers frequently had to run long single ended lines. The benefit of mono amps and short speaker cables was well worth the longer lines. With good cable it is not the end of the world. But, when you buy commercial interconnects you really do not know what you are getting. Companies like Canare and Belden publish the specs of their cable so, you know exactly what you are getting. Plus, when you make your own you can make them as short as possible. You do not have to go to the next longer length and coil the excess behind the equipment.

Funny, my first post two days ago was a recommendation of Jensen transformers. I’ll do it again here and suggest the PC-2XR
https://www.jensen-transformers.com/product/pc-2xr/

Regarding the Canare XLR-m to RCA adaptor: I don’t recommend it. It shorts pin 3 to ground. I prefer connecting pin 2 to the RCA + and pin 3 to the RCA ground using a shielded twisted pair cable. Its shield would terminate to pin 1/shell of the XLR.

thanks everyone,

I finally understood a simple XLR/rca adapter defeats the advantage of using Balanced,

so, it's balanced for 35 lf

into this conversion box, which maintains the advantage of balanced for the long run.

https://www.amazon.com/gp/product/B003S7T49K/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

last 5 lf rca out of the clearboxproto to amp's rca in

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I had to choose between 22 awg OFC

or 16 awg Pure Copper

considering the 35 ft length, I chose 16 awg pure copper.

I read somewhere that the % of purity between Pure and OFC is very slight, the difference in conductivity hard to measure actually; whereas I would think, the difference in conductivity 16 awg to 22 awg is definitely measurable at 35 lf.

interconnects; speaker wires (16 lf 13 awg/leg); speaker wire spades are all OFC

speakers are horns/15" woofers, 16 ohms from 1958, efficiency over 100; amp has 16 ohm taps.

cayin tube amp is 45 wpc, so volume should not be an issue, noise free and modification to frequency response the culprits to listen for.

under the floor there is no machinery, I will see if/how many electrical feeds to nearby wall outlets I cross. Original to 2 wall outlets BX; 1 new 15 amp sep ckt for the amp is ROMEX I presume

% of purity between Pure and OFC is very slight

Actually if they are being honest there isn't any at all. 'Pure' is a marketing term; OFC is what there is.