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Re: i need help with my new HTPC
You reference an 'HTPC' in the title (eg a Home Theatre PC) which is a PC with all the components to support Home Theatre, except (usually) the Power Amplifiers and speakers.
Your question seems to concern mainly your AVR, the Audio-Visual Receiver from Samsung.
This is rated as a 7.1 channel device with 6 channels rated at 100W, and the seventh sub-bass channel at 150W (providing a total of 7 channels at your 850W).
The peak outputs (a short peak of energy) are usually double that figure, ie 200W a channel + 300W for the sub-bass.
Your speakers should have a sustained maximum that AT LEAST matches the rated power, and a maximum that matches the peak. You never want to drive these to peak anyway, as the cones are being driven to their full extension. So with your speakers, you have a good match to handle the amplifier channels.
Yes, you are limited to 850W. But unless you've won another lottery and have a very big house, or you intend to have pop festivals in your garden, I shouldn't worry. Neighbours start to complain before you ever get to 850W.
Others may indicate otherwise: I'm a newbie. It may all depend on the sensitivity of the speakers, where you position them, your threshold of pain etc.
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