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#11
As much as you could benefit from quality headphones, do not believe they will increase the output volume of a Youtube video (or any media for that matter). It is little more complicated than that.
The Impedance of the majority of cheap consumer grade headphones (not saying what you currently own is cheap) is actually pretty low. They also employ a somewhat high sensitivity. This allows them to be compatible with multiple devices such as smart phones, ipods and laptops that have a poorly implemented headphone amplifier (for simple terms). Here is an example…
Apple ear buds has an impedance of ~25ohms and a sensitivity of 109db per 1mv. A somewhat high end In Ear Monitor (IEM) which costs 3x that of the Apple has a impedance of 13ohms and a sensitivity of 92db per 1mv. Despite having lower impedance, the high end IEM also has a lower sensitivity rating therefore will not play as loud as the Apple ear buds.
Also when dealing with low impedance headphones you have the possibility of an impedance mismatch with your headphone output which could result in a constant hiss. But I will save that techie talk for another conversation.
If you are disappointed with the output volume of your current headphone jack, the simplest solution is to buy a headphone amplifier. I can’t comment on that Creative Labs you pointed out above. But given its cost and extremely vague specs I would be skeptical about its quality.
Countzero hit the nail on the head by stating the best way to save money is to buy the right gear ONCE and never upgrade. It’s unfortunate but this usually means paying a little more than anticipated.