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Ask Engadget HD: Setting up IR repeaters?

As your home theater setup grows, for many a problem is moving components out of line of sight, and still being able to control them. While for a few a Bluetooth or other RF technology takes care of remote control issues, the majority of devices still rely on IR control, and making that work is what our friend Keith is trying to figure out:

"Hopefully you can help me out. My father in-law had a custom entertainment cabinet made that has no windows. Obviously in order to work the components, the doors have to be open. He currently has a Comcast DVR and Blu-Ray player (Magnavox), all connected to a 60" LG LCD TV; which he would like to control with the doors shut. Naturally he is looking at me to solve his problem.

Never having set up a I.R. repeater, I've done a little research on the good ol' web. I was surprised to find a range of products and prices to be able to set this up. Secondly, some look easy and some look complicated. I need help. What is the best, fairly cheapest, and easiest way to set up a repeater for the components listed? Do I have to buy 2 repeaters to be able to control both components or do they make one that branches off."

We've talked about setting up IR blasters before and how to shift your components to an out of the way cabinet or similar, but for this specific request we're wondering what you're relying on to keep those little bursts of light headed in the right direction. As usual, drop any recommendations in the comments.

Got a burning question that you'd love to toss out for Engadget HD (or its readers) to take a look at? Tired of Google's blank stares when you ask for real-world experiences? Hit us up at ask at engadgethd dawt com and keep an eye on this space -- your inquiry could be next.