Newbe Help what AV amp


Hi, almost picked up ATC SCM40s for my front 2 channel , my source is a Denon 4010UD bluray player, I tried the ATC SIA 2-150 amp.
The sound was fantastic with CDs playing direct mode but the minute I tried a Concert DVD or a concert Bluray the sound was awful..
Is it a problem with the connection or do I need a AV Amp.
Anyone tried Primares with. ATCs or should i stick to ATC amps?
thks
rainmonkey
Manual for the Denon if it's the correct one.[http://denon.co.uk/DocumentMaster/UK/DBP4010UDE2_ENG_IM_204.pdf]
I'm not that savvy when it comes to all the new multi-channel audio. I'm a two channel guy. If nobody that is savvy on this chimes in, try the 2ch (two channel) setting on your Denon. Its on page 24(pdf shows 28) in you manual. This may work, but I don't know if it will have an affect on the output for other things you play, but you could always change it back. If this doesn't work, maybe you could put a "Y" on the two channel output to feed both your tv and stereo.[http://forum.audiogon.com/cgi-bin/fr.pl?bhome&1296254376&openfrom&1&4#1]
Sorry, the link was supposed to be for the manual.[http://denon.co.uk/DocumentMaster/UK/DBP4010UDE2_ENG_IM_204.pdf]
I should have mentioned, the Y connector works sometimes, but not always with the best sound.
Thks Hifivn,
Tried the 2 channel setting n it sounded muddy, Ran it last week with a sad Onkyo AV amp , The sound was much better.I guess ill have to go in for an Av amp for the DVD part,,,a bit of a bummer as i was hoping to keep it totally 2 channel. I really dont want to add a centre or a sub.