Nope. The output on the zapfilter is pretty hot though and tends to make people either love it or hate it. Still, with good volume matching, a zapfilter modded E5 can certainly play with the big boys. I prefer my new CD player, but it is really a matter of preference/sound signature.
I think Earl has experience with zapfilter modded sources though, so the output level shouldn't be a problem for him. Congrats buddy!