So it’s been a couple of weeks now since I picked up the HFi-580s and I thought it time to give my impressions. For reference the cans have been tested on the following:   Apple iPad 1st Generation 16GB Wifi Model   Samsung Epic 4G Android Phone   Creative Fatal1ty Professional PCI-e Entertainment Profile, no FX,  through Behringer Xenyx 1202FX Mixer through Foobar 2000 ASIO Playback   My comparison is going to be against my previous cans, Shure SRH440s w/ 840 pads. I will not be drawing comparison to the Monoprice cans...

For 20 bucks, it isn't a bad piece of kit. Nice little volume boost, added bass kick to my SRH440s. Really can't go wrong if you want something tiny, portable and have a bass light set of cans or IEMs.   The only con I really have with it, is that the volume down button is VERY close to the headphone out jack. If you have a set of phones that have a large plug the minus button can be hard to hit. Other then that it's a nice little starter portable amp. Now it lives in my car, to boost my phone going into my AUX in jack, which is very quiet.

Stepped up to a CMOY OPAMP 2227 from my FiiO E5. Definitely a nicer volume boost, also adds some bass to my already booming HFi-580s. Fun little amp to have on the go for a good price. Haven't compared it against really high end stuff though, so can't say if it's a great audio quality booster. But for 25 - 45 bucks, they're a nice way to power cans that need it, or give a little kick to ones that don't.

For reference, I am using these with the SRH840 Pads, powered through a Creative X-Fi Fatal1ty Titanium & Behringer Xenyx 1202FX Amp/Mixer.   So lets go!   First off, Comfort. A lot of impressions said they felt these headphones were heavy, or the headband was painful. I've been wearing mine hours on end since I got them and I haven't experienced any discomfort with the headband, or the weight though to be fair I am used to wearing a PC Headset most of the time and they usually run heavy. Also the SRH840 Pads make a huge difference in the...