I was in the process of upgrading and testing equipment.
Allnic L5000 DHT to Allnic L10,000 OTL/OCL (no capacitor, no transformer)
The signal fed a Allnic A6000 300b monoblock with both balanced and unbalanced inputs. However, the amps are single ended, unbalanced circuit design. I had run balanced because of the 35' run to the amps. When I switched to the new preamp, the balanced output of the L10,000 required the use of an internal quality transformer. Notably, that transformer removed the magic the linestage preamp offered. So I sold my cable off for unbalanced solution and it was the single best move ever.
In conclusion, I reach out to the manufacturer of each component regarding circuit design and if the upstream component is true balanced circuit design, then I used balanced cable and ideally components downstream that also have true balanced circuit design.
In this case, I did the opposite. Everything from DAC to amps were unbalanced.