This got me interested, once again, in the idea of external LPS devices. And in addition @itsjustme made a very helpful post.
I already have components plugged into a Shunyata Hydra 6, but was wondering whether the DSP I am using would benefit from an external LPS.
So, I emailed the support department for the DSP unit and received a very prompt and helpful reply. Seems, the company had already done their own research and found that for their particular unit, that an external LPS "may" not offer any benefit.
Per their response: "We have not seen any measurable difference between different powers (from laboratory power supplies to cheapest possible inverter supply). However, the improvement gained can also depend on the quality of your local power supply network."
So yes, it might be construed that an LPS could be of benefit assuming the local power supply network isn't of decent quality, but this is something that I would think would be difficult to determine without the appropriate measuring equipment. At this point I have decided to place the idea of an external LPS on hold.