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There are two possible problems here and I can't tell from your post which (or both) is affecting you.
1, The amp is taking time to process and output the signal, either intentionally (delay for surround specifications, see below) or unintentionally (just from having to process the signal etc. like with power amps in clubs)
2, Arrival time differences between the two systems. Basically the speakers in your living room are further away so it takes longer for the sound to reach you meaning there is a slight delay, manifesting as a small slappy echo.
If the problem is the first one, that amp should have a direct output option (called non surround or surround off) but that might only be for a stereo pair (not the full set of surround speakers). Most surround amps have configurable delays (usually surround modes) for the speakers to adjust arrival times for the sound coming from each (or groups of) speaker(s). You need to set this to nothing (surround off) otherwise there will be a delay. Typically the delay is something like 30 ms for rears (dolby surround etc.). Sometimes these surround settings also include delays between front and rears to mimic room types such as halls etc.
If the problem is the latter issue (2), then unless you move the dj'ing/listening position to be equidistant between the two sources then your screwed, and are not going to be able to get rid of the echo effect. Even if you do make it equidistant, if there is a processing lag difference between the two systems then you will get an echo or phasing.
Hope this helps....
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