I will be buying new monitoring headphones soon, and I just had a question regarding impedance. Now it is my understanding that high impedance headphones need some kind of headphone amp to be able to reach proper listening sound volumes, but is that the only difference between high and low impedance headphones? I will be doing mixing/monitoring on my home laptop, so I'd prefer something that doesn't need a headphone amp. However, it is also my understanding that getting a low impedance headphone has a serious negative effect on it's sound quality, frequency response, sound stage, clarity, sensitivity, and drive. Is this true? If it is, should I instead get the high impedance version along with a headphone amp (which will end up being plugged into my laptop headphone port), instead of just get the low impedance version and plug it into the laptop right away? Is the difference in the sound quality between the 2 headphones really serious? I'm looking at the 55 Ohm and 600 Ohm versions of the K 240 headphone. So if possible, be specific to those headphones. As mentioned, they will be used 99% for mixing/monitoring in production of trance music at home i.e no professional studio equipment, etc...would a headphone amp be possible to plug into a laptop headphone port in the first place?