I have spent most of my life in Seattle ( 44 years as of tomorrow) and fans have ALWAY been loud when the home team is decent in the PNW ( Seattle). Huskies in the late 70's - early 90's for example. Husky stadium was a pile, but the fans MADE it loud. IIRC the much hated wave was invented in Husky stadium. The loudness and wave were considered an experience at the time, now we have trolls complaining about it. The internet has changed that perception, ignorant fans of other teams use it as an excuse.
I went to a lot of Mariners games in the Kingdome in 1995, before they started that epic roll. It was crazy how much noise 20K people can make if they work at it. Never attended a Hawks game in the 70's or 80's but I know it was loud and the fans took pride in the FACT that they helped the home team with the noise. The local media and the national news agencies mentioned it as a factor. That rule the NFL put in place was a direct effect of the noise Seattle fans created in the old King Dome for Seahawk games. For the 49er fans, this isn't new for the PNW. Sonic games in 80's and 90's were the same. LOUD. The reason the Sonics didn't win a couple more titles were caused by that piss poor officiating against the Suns with Barkly and a run in with a returning Jordan.
I would be cool if SF's stadium was designed to take advantage of the fans loudness, I would guess it is. I just don't see it happening though. The fans have to create the sound / loudness for it to work. For the doubters, Seattle has NEVER been caught piping in crowd noise. For the Whiner fans, your not the first to claim this. Ask the Giants fans how that turned out....
I spent almost ten years in Northern California ( 82 - 91) and most of my friends and their parents were niner fans. They were way to laid back to be able to duplicate the loudness Seattle fans generate on game day when the team is good. If the local team sucks the fans are quite, but they understand this isn't a friggin movie and know how to make a difference when it counts. My brothers wife has several niner fans in her immediate family. She asked me last weekend why I don't talk football with them. The gods honest truth is because they are not informed enough to talk football. Claiming the niners cant be affected by bad weather ( below freezing, snow, ice, wind chill etc.) because they play in Candlestick??One of her brothers told me last summer that Kap will be much better than Wilson because he has started for two years. This was at a 4th of July party last summer ( 2013). Iphone came out, facts were viewed, dude left.
We as fans still feel were a small market, but know a good team when we see it. This is our year, and being ignored by the NFL for decades has inspired the fans. We WANT this, we WANT a SB victory and by god we will try to help every way we can. If the Hawks win the SB it will be interesting to see how the fans react to it next year......Or if they win a couple...will the fans get complacent??