Suggestions for fully shielded power cord...

Audphile1, your post is unclear. Unshielded Audience versus shielded what?? You may be comparing apples and oranges in terms of the other properties of the cord(s) such as gauge, conductor material, length, etc.

Shielding, if it is a floating shield, and all other characteristics the same as the unshielded cord, should have no sonic effect. A floating shield does not carry any current, so cannot effect the energy transfer of a given cord.

I'm not debating what you experienced. I'm just not sure you were making an equivalent comparison. I'm wondering therefore, if the Audience cord is simply a larger gauge cord than your shielded one.

You can buy a Volex shielded 14 AWG cord from Allied or Carlton-Bates for less than $20. Chris VenHaus (VH Audio) offers his shielded "Flavor 1" for $115 and up (depending on which termination options you choose) with a 60-day return priviledge. Silver Audio WattMaster is also an option at $525 with a 30-day return option.
I certainly haven't compared these on a Trumpet so I have no idea whether more money would translate into better sound. You'll have to experiment.

Nsgarch, I compared Audience to Shunyata Diamondback, PS Audio Prelude and Acoustic Zen Tsunami+. Found Audience to sound best with the dac and other cords to be good on pre and amp. However, Audience also was also very good on the amp as well. Prelude is out of the picture altogether as I liked it the least. It was the most shielded(I think) and sounded worst than the stock cords. I don't know what gauge Audience is but I don't think this is what contributed to the differences between the cables in this given example. Anyway, the best way to find out what works is to try. But Audience is one cord I wouldn't hesitate recommending.

Greenman - I think the Wattmaster may be overkill on the Hagerman and at 8 gauge is more suitable for an amp. However, the Powerburst 2 looks pretty viable and will save me some cash.

Nsgarch - I would like some recommendations if you could as I'm interested in the floating shiled design. If you prefer to email me privately please feel free, you've been a big help in the past with some issues I had with a previous phonostage that had bad grounding issues so I value your advice.

Overall, the Volex (which I may buy anyway as I have been hearing a lot about this cord and is a no brainer at the price), Pure Note, Silver Audio, and VH Audio Flavor 1 all appear to be shielded at both ends.

Keep the advice and suggestions coming, this has been very helpful.

Audphile1, I do not know that your comparison of the Diamondback and Prelude against the Audience is a good example of shielded vs. non-shielded: The Audience is a good PC, while the Diamondback and Prelude are primarily entry-level. I have tried the Audience in my system, and although I preferred the Shunyata Taipan Helix Alpha (non-shielded) and Cardas Golden Reference (shielded) on my amp, and the Cardas on my CD player, I thought the Audience sonically a better cord than the Diamondbacks I was using for a while.