Well, mine had no problems with volume and bass. There was too much bass,but it was without definition and sounded cheap and boomy. Mids and highs were without definition and clarity,the bass colored and distorted them. The people over at head-fi forum say s4 sometimes sound muddy and with too much bass, so I was unsure- maybe that's the way they should sound in the first place. And then the logo faded away, so i returned them. :) If they don't have enough bass, try with different size earplugs until you get a good seal.
This is what's interesting to me... A lot of people say the logo fades, but for some it doesn't. Some say it has too much bass, some say it has too little... As I pointed out in an earlier post, the reality is that Klipsch does change the design of these things from time to time, be it discontinuing the cleaning tool, changing the number of buds, or, as some reviews seem to imply, maybe even changing the internal design of the headphone itself.
Needless to say, I'm lost, because there doesn't seem to be a definitive way to know. >.<
Even with external design changes, the internal design surely does not change. That would call for an entirely new line of earbuds. Honestly, the only way to know is to go to an authorized retailer, buy it, and compare them. In the real ones, there is no bass overload - all mids and highs can be heard. For people who say there is too little bass, it's because they haven't got the fit right and/or haven't gone through the 50 hours of burn-in.
I think it comes down to this: regardless of whether your earbuds (that you bought online from a non-authorized retailer) have logo fading, if you immediately notice muddled and over-powering bass that eats up the mids and highs, they are fake.
Let me start by saying that I absolutely agree with the premise of a significant difference in sound quality between genuines and fakes. That much seems evident, at least from the reports I've read here and on eBay...
That said, I'm not so sure about the other part... It's very difficult for any company to build a piece of electronics exactly the same over a very long period of time, and changes may or may not be documented when it comes to issues of internal parts suppliers. I've had experiences before where two units of a specific brand and model of headphone purchased years apart (in that case, Sennheiser) sounded different, and they were both from the same authorized B&M dealer. Also, things like LCD monitors will often use different brands of panels just depending on the batch that monitor was a part of or the specific factory it came from. Heck, there are models of cars where final assembly may be done in two completely different countries, and you can't know without checking the VIN!
In the case of these specific headphones, when Klipsch changed from the L-shaped connector to the straight connector, people also started noticing differences in the wire strength/thickness and other issues... I wouldn't be surprised if there was a change of suppliers when this happened in 2010.
I do agree though, it seems that if the headphones have very muddled bass and lack definition, they are definitely suspect. Fortunately, the pair I bought off Amazon doesn't seem to have that issue... A relief to be sure! Hurrah! =D