Krell Integrated

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My system currently consists of:

- Paradigm Studio 60 v4 loudspeakers
- Rotel RSX-1057 5.1 receiver (used only for audio decoding, all video is connected directly to the TV)

My sources are:

- Motorola DCT6416 HD+DVR Cable Box
- Denon DVD-2930CI (used primarily for DVD and CD)
- Squeezebox 3 network music player

In any case, seeing as my system is 2-channel (no subwoofer even), I'm not really getting any added benefit from a full 5.1 receiver (though I do love this receiver).

I have an opportunity to purchase a Krell KAV-400xi integrated amp for $1,595 CAD (a very reasonable price as this model typically retails for over $3,000 CAD). This model is very highly regarded in reviews, and I've read that this integrated amp is superior to entry-level separates from Arcam, Rotel, NAD and Outlaw.

In your opinion, worth the upgrade? Seeing as the amp costs twice my speakers, I'm nervous as to what the effects might be. Will this be a reasonable match? Will I need to consider some serious cabling upgrades? Any negatives?