OK, well you raised a couple of things.
Lets talk about the CDP. Any digital device (CDT, CDP, DAC, DVD player, computer, etc) should use a shielded cable because the power cable can act as an antenna that will broadcast digital RFI ("hash") into the air. (Some computers and monitors even have a ferrite bead at the device end of the cord to capture digital RFI).
In addition, the cord can also introduce hash into the power line itself, so you want to put these devices either on separate circuits from the other stuff, or, if you're using a power conditioner, most modern ones have a couple of "digital outlets" that are for these devices. They have filters on them that keep the hash out of the rest of the power lines.
So always use shielded cords on digital stuff.
Now about the cords themselves. The reason a lot of manufacturers use the ferrite beads (even though they're not as effective as shielding IMO) instead of shielded cords has to do with UL approval. UL approval for a shielded OEM power cord (and therefore the device itself) requires that the shield be attached to ground at both ends of the cord. Such a cord will shield OK, but by connecting the shield at both ends, a ground loop is formed and so such cords are susceptible to hum pickup.
Most aftermarket shielded cords, have the shield connected to ground only at the AC plug end. This is called a "floating shield" and is the best way to do it. DO NOT use a ground-lifting "cheater plug" with these cords or you lose the shielding properties.
I'm not going to recommend a specific cord, but make sure you ask the manufacturer three questions (and do get answers or don't buy the cord):
1.) Is it shielded (and you might ask braid? or foil? or both?)
2.) Is it a floating shield?
3.) Which end is the shield connected (you want the AC plug end)
Two other things:
One has to do with wire size. For some reason (I don't know why since they don't draw a lot of current like amps) CDPs and DACs seem to perform best with big conductors (10 AWG, or slightly smaller 12 AWG) Sometimes it's hard to find these sizes (especially 10 AWG) shielded, but they are available.
The other has to do with the use of balanced power units. If you are using a balanced power unit to supply power to your front end stuff, you don't really need shielded power cords because noise in the power line is self cancelling, and as long as the conductors are twisted, the cord shouldn't pick up RFI/EMI. Even so, dgital devices should still use shielded power cords, even with balanced power, because the balanced power doesn't keep them from broadcasting RFI.
Lets talk about the CDP. Any digital device (CDT, CDP, DAC, DVD player, computer, etc) should use a shielded cable because the power cable can act as an antenna that will broadcast digital RFI ("hash") into the air. (Some computers and monitors even have a ferrite bead at the device end of the cord to capture digital RFI).
In addition, the cord can also introduce hash into the power line itself, so you want to put these devices either on separate circuits from the other stuff, or, if you're using a power conditioner, most modern ones have a couple of "digital outlets" that are for these devices. They have filters on them that keep the hash out of the rest of the power lines.
So always use shielded cords on digital stuff.
Now about the cords themselves. The reason a lot of manufacturers use the ferrite beads (even though they're not as effective as shielding IMO) instead of shielded cords has to do with UL approval. UL approval for a shielded OEM power cord (and therefore the device itself) requires that the shield be attached to ground at both ends of the cord. Such a cord will shield OK, but by connecting the shield at both ends, a ground loop is formed and so such cords are susceptible to hum pickup.
Most aftermarket shielded cords, have the shield connected to ground only at the AC plug end. This is called a "floating shield" and is the best way to do it. DO NOT use a ground-lifting "cheater plug" with these cords or you lose the shielding properties.
I'm not going to recommend a specific cord, but make sure you ask the manufacturer three questions (and do get answers or don't buy the cord):
1.) Is it shielded (and you might ask braid? or foil? or both?)
2.) Is it a floating shield?
3.) Which end is the shield connected (you want the AC plug end)
Two other things:
One has to do with wire size. For some reason (I don't know why since they don't draw a lot of current like amps) CDPs and DACs seem to perform best with big conductors (10 AWG, or slightly smaller 12 AWG) Sometimes it's hard to find these sizes (especially 10 AWG) shielded, but they are available.
The other has to do with the use of balanced power units. If you are using a balanced power unit to supply power to your front end stuff, you don't really need shielded power cords because noise in the power line is self cancelling, and as long as the conductors are twisted, the cord shouldn't pick up RFI/EMI. Even so, dgital devices should still use shielded power cords, even with balanced power, because the balanced power doesn't keep them from broadcasting RFI.