Loud and Clear-er

As a sort of Christmas gift to myself, I made a couple upgrades to the audio of our home theater a few months ago and I’m finally getting around to putting up a note about it. You may be thinking, “what, didn’t you just build all that just a couple years ago?” Well, true, but all the audio gear was existing equipment we’ve had for several years. The speakers came in a theater-in-a-box type package so they weren’t particularly great. The receiver in the set was actually pretty decent, but it long pre-dates HDMI connections, HD resolutions, and the new audio formats (like Dolby TrueHD). I never had any complaint with sound quality of the original setup, but I suspected it was a tad muddled in general and somewhat underpowered in the center channel. The one place I did invest when building the basement was with a quality subwoofer. I got it second-hand off eBay, but it’s a 150W, 12inch, THX-certified monster. The sub by itself greatly improved the original sound by adding strong support to the small satellite speakers. With this upgrade I was looking at keeping the sub, replacing the satellites and receiver, and rewiring components.

I knew I wanted to stick to a satellite speaker system, and honestly, for quality sound there aren’t a ton of options. After reading many reviews I decided on the Prestige line by Mirage. Mirage is one of only a handful of manufactures that really does a nice job with small form factors. They use a unique design in which the majority of the sound is reflected before reaching the listener. The effect is one where the sounds has less pinpoint directionality and the overall soundscape is more seamless. Mirage has a couple different sets: the Nanosat set (recommended by gizmodo), and the  Prestige set which has a little higher efficiency (89dB/91dB) and a little more solid center speaker. Either can be purchased with or without a sub, and since I had didn’t need the sub I opted for the higher-end set. Luckily the website Vanns.com runs some great sales from time to time.

I was a little reluctant before buying them, especially since I couldn’t listen to them locally first hand (typically something I’d urge anyone to do). But once they were all mounted (which was a little tricky with these) and the audio rebalanced, the sound was notably better. At this point, I still had the same receiver, but I noticed more high end definition and more continuity across different frequencies and around the room.

The next step was to replace the receiver/amp. I’d been keeping an eye on the receiver market for a while. At a couple points I was close to either an Denon or an Onkyo, but a Harman Kardon eventually won me over. I went with the AVR 2600 which is a 7.1 receiver with a decent amount of power and support for all the latest audio formats like Dolby True HD and DTS-HD. Of course I’m only running the system as 5.1 now, but if I ever decide to add the two back speakers (which are already prewired) the amp with be ready for them. It’s also HK’s lowest end model that’ll handle video transcoding to 1080p using a respectable Faroudja processor.

Filed under Basement

Fixing the Blu-Ray Blues

Not too long ago I moved my former PC of greatness down to its destined home, the basement AV rack. That was after a reconfiguration to Windows 7 RC and the addition of a spiffy new Blu-Ray (BD) drive and IR receiver. For the most part Win 7 is great, and the Media Center application is better than ever.

So I finally got to the point of actually trying out BluRay playback for the first time, and here’s what I got:

Well, crap! I spent a total of seven hours tracking down the source of the problem. My first expectation was the video driver, so I tried several clean installs of various versions. No luck. I thought maybe it had to do with some of the auxiliary applications I run (anyDVD and powerStrip), so I tried updating, then altogether disabling them. No luck. Maybe the actually software playing back the BD disc? I updated PowerDVD to the latest version. No luck.

With all the software options running out I started to suspect hardware. To eliminate the BD drive itself, I tried playing back a 1080p rip of Ironman. Sure enough it quickly threw up the same BSOD. So, it seemed there was a problem with 1080p video decoding in general. Wasn’t my trusty 7900 GT OC up to the challenge of BluRay decoding? After all, 720p videos were playing fine and it still had decent power for gaming last time I used it.

Google eventually led me to this thread where one guy recommended changing the K-Lite ffdshow configuration for H.264 decoding. Pretty obscure, but I did that and then tried to play the Ironman file and it worked great! So this was definitely pointing to something about the 1080p H.264 decoding as the problem. I tried to play a BluRay disc in the drive again and got another BSOD. See, changing the ffdshow decoder works fine for apps that use ffdshow (like Media Player Classic and VLC Player), but it’s not used by powerDVD which is one of the very few programs that reads BluRay discs well (i.e. support the latest BD features). Not only that, but ffdshow involves software decoding leading to much higher CPU utilization than with hardware acceleration.

From there I started reading about the basics of Windows hardware acceleration trying to understand why I was crashing during HiDef playback. DXVA (Direct X video acceleration) is Microsoft’s API for hardware acceleration and, in my case using an Nvidia card, PureVideo is the bit-stream link for DXVA to use the GPU for processing. DXVA was even enhanced on Vista and Win 7, so what gives? Turns out, my 7900GT features Nvidia PureVideo technology, but not their enhanced version, PureVideo HD (this was added in the 8 series GPUs). The original generation of PureVideo cards apparently handles MPEG-2 decoding very well, but the second generation handles H.264 1080p decoding much better.

So, I needed to upgrade the graphics card after all. I decided on a 9500GT which offers the hardware acceleration I needed at a pretty low price point. While I was at it, I went with a card that had a native HDMI jack and a large heatsink with no fan. It also has 512MB of RAM, up from the 256MB on my last card. Suddenly 1080p playback with hardware acceleration was a breeze and CPU usage dropped way, way down. The native HDMI connection is extremely nice, too – the picture is sized and centered perfectly (no more need for PowerStrip) and much sharper than VGA which I was using before.

Filed under Basement, Comp hardware / mods