Other Factors Besides Impedance
4. Sound Quality, Sensitivity, and More
Impedance is important, sure, but it's not the only factor that determines how good your headphones sound. Don't get too hung up on it! Other specifications, such as sensitivity, frequency response, and driver technology, all play a significant role. Sensitivity, measured in decibels per milliwatt (dB/mW), tells you how loud the headphones will be at a given power input. Higher sensitivity means louder sound with less power. It also means it's more prone to hissing, which we addressed above.
Frequency response indicates the range of frequencies the headphones can reproduce. A wider frequency response generally means the headphones can reproduce a broader range of sounds, from deep bass to sparkling highs. However, a wide frequency response doesn't necessarily guarantee good sound quality. It's just one piece of the puzzle.
The driver technology used in the headphones also has a big impact on sound quality. Different driver types, such as dynamic, planar magnetic, and electrostatic, have their own strengths and weaknesses. Dynamic drivers are the most common and are generally affordable and reliable. Planar magnetic drivers offer excellent detail and clarity but are often more expensive. Electrostatic drivers are known for their exceptional transparency and speed but require specialized amplifiers.
So, don't get too caught up in the impedance number. Consider the overall package — sound quality, comfort, build quality, and features. Read reviews, listen to different headphones, and find what sounds best to your ears. After all, sound is subjective, and what sounds amazing to one person might sound terrible to another.