This LFE input is not for stereo line output of any device. You have to connect to a device with LFE output (sub-out) for example a Surroundreceiver.
The Y-cable you have asked doesn't exist.
If you have prepared the signal on these outputs for the LFE input by using extreme EQ, then
you can make a cable with these adapters :

1 x https://www.thomann.de/de/cordial_cfy_03_ecc.htm
2 x https://www.thomann.de/de/the_sssnake_1820_adapter.htm
1 x https://www.thomann.de/de/the_sssnake_1827_adapter.htm
and for making it longer
1 x https://www.thomann.de/de/cordial_cpds2_cc.htm

Dear Waedi,

you're absolutely right, the LFE input is NOT for Stereo output. The LFE input on my Active Subwoofer was previously connected to the separate dedicated Subwoofder R+L analog CINCH outputs of my previous, now defect, integrated amplifier. Sorry for the confusion.

So, I now plan to connect the R+L Main Outputs 1/2 TRS 6.3 mm jacks on the RME DAC to the R+L CINCH Inputs on my Active Subwoofer. I most probably found the correct cable for my purpose on this site: https://www.digitec.ch/de/s1/product/pr … el-5872582

However, these are 6.3 mm TR (Mono) plugs, as opposed to 6.3 mm TRS plugs. The RME DAC Manual refers to R+L TRS Main Output 1/2 only.

Please note that I could not find a similar cable on the Thomann.de site.

Please advise if the TR (mono) instead of TRS plugs are suitable for my purpose. And should you by chance know a superior similar cable from another brand, I would be much grateful to learn which is "the best".

I very much appreciate your below expert feedback.

I look forward hearing from you again.

Kind regards,

switch6343

The mono-jack cable is fine.
My favorite brand is Cordial for home use, never had an issue.
The best cable is that one with correct wiring and in good shape.
The salesman can tell you a lot more about the best cable and then you end up with overpriced stuff you don't need.
Digitec and Thomann are good for me because they take it back if it is not working.

waedi, thanks for mentioning Cordial.

I found several brands which offer twinsets in various lengths of cable with RCA/CINCH male plug <> TR 6.3 mm male plug.

I decided and already ordered a 3.0 m twinset from the brand Cordial, which is reputable German company. Price/benefit excellent. Most important features: both RCA/CINCH plugs as well as the TR 6.3 mm plugs are gold plated and manufactured by the very reputable  German manufacturer NEUTRIK.

A great many thanks for your excellent advise. You avoided me to get lost in that forest of offerings in cables and plugs and enabled me to quickly get on the right track.

Have a great weekend.

Dear KaiS;

I have all day thought of your advise which cables I would need:

QUOTE
ADI-2 to sub: TS to RCA, connected to ADI-2 Pro‘s TRS/TS rear outputs.
Sub to main amp: RCA to RCA.
UNQUOTE

However I only now fully understand what you had proposed:
1. connect the RME DAC's Main Line 1/2 OUT (on the rear) TS 6.35 mm R+L <> Velodyne's RCA/CINCH Line-IN R+L
2. connect Velodyne's RCA/CINCH Line-OUT R+L <> Hegel H20's RCA/CINCH Line-IN R+L

I trust that my above verbatim description represents your proposed connection setup, with the advantage that your setup would avoid phasing problems, as the built-in crossover of the Velodyne exepectedly would avoid such phasing problems.

My plan was:
1. connect the RME DAC's Main Line 1/2 OUT (on the rear) TS 6.35 mm R+L <> Velodyne's RCA/CINCH Line-IN R+L (identical to your proposition)
2. connect the RME DAC's XLR Main Line 1/2 OUT (on the rear) R+L <> Hegel H20's XLR Line-IN R+L.

My understanding is that in de RME DAC the settings for each of the Main Line 1/2 OUT XLR R+L AND for the Main Line 1/2 OUT RCA/CINCH R+L can be separately and independently configured, i.e. also for crossover, slope in dB/Octave, phasing etc.

The latter, my plan, would allow to exploit the plethora of sophisticated setting options of the RME DAC, also with regard to crossover settings and phasing. Probably this could be  a pretty time consuming process. Hopefully the very new ADI-2 Remote desktop application could possibly make this process much less time consuming and much more user friendly

I assume that with your proposed setup, the Velodyne's phasing can be changed (0, 90, 180, 270) as required, which is expectely not possible under my planned setup.

I wanted to share with you my deliberations, only after I fully grasped what your proposal encompassed. You may wish to share your opinion on my above conclusions and understanding of this particular theme. I would much appreciate.

Kind regards,
switch6343

KaiS, a great many thanks for your feedback, excellent. It cleared  some misunderstanding on my part and above all cleared some wrong information I retrieved from other sources, just can't remember which anymore, possibly forum threads?

Much appreciated that you shone some light on the outstanding issues with my plan.

Your proposition is the way to go. Thanks.