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TL;DR version =
PROS = Deep yet controlled bass; clear mids and highs; wide soundstage; "fun" to listen to; low-impedance (easy to drive); deep earcups don't cause ear fatigue; short cord (1m) for easy portability.
CONS = "Sparkly" treble might be too harsh for extended listening; clamping force might be too much for some people.
Now for the long version...
This review might be a bit lengthy, so bear with me. I take product reviews quite seriously, and as a reviewer myself, I try to make sure that I am as informative as possible, and to be completely familiar with an item before reviewing it. Anyway, today I'll be reviewing the HFI-780, and for the past year and a half, the HFI-780 has been one of the few things in my house that I use on a daily basis. When I'm in front of the computer, the HFI-780 is almost always on my head.
First off, I'm going to give a brief background of the headphones I've previously owned, and how I ended up with the HFI-780's. My very first set of headphones were the Sony MDR7506 Professional Large Diaphragm Headphone, which I bought over 5 years ago. They are still some of the best studio headphones on the market. Though personally, I found the sound signature to be a bit too flat/neutral for my liking. I wanted something that was fun. So then 3 years ago, I jumped ship to open-back headphones and bought myself a Sennheiser HD595 Dynamic High Grade Performance Premiere Headphones. The HD595 is still one of my most favorite cans, and quite justifiably, due to its very open and airy sound, as if I'm listening to speakers or listening to a live concert. In the headphone community, open-back headphones are arguably the best-sounding type of headphones, since they do not restrict airflow, thereby making them very natural-sounding. Now, one of the downsides to having open-back headphones is sound leakage. Being designed the way they are, sound that is being made around you can easily be heard, and similarly, the music you're listening to can also be heard by those around you. The second drawback to open-back headphones is that the bass response is usually not as resonant as those on IEMs (in-ear monitors), or closed-back cans. This lack of bass can usually be corrected by playing with the EQ, having a dedicated amp/DAC, and/or buying more expensive headphones like the Sennheiser HD 650 Headphones.
So, after owning the HD595 for awhile, the 2 drawbacks I described pushed me yet again to search for the "perfect" set of headphones. This then led me back into the realm of closed-back headphones, and I started doing some extensive research on forums like Head-Fi, and various other sites.