Music Alchemist
Pokémon trainer of headphones
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- Dec 17, 2013
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@Hawaiibadboy @LaPierre
The JVC specifies a sensitivity of 108dB @ 1mW. They have an impedance of 16 ohms. If you want enough headroom to go to 120dB cleanly on transients (which should be way more than enough), you'll need 16mW. To attain 16mW into 16 ohms, you'll need around a half a volt of signal amplitude. This is all pretty trivial for any modern amp. The one potential issue is that with two drivers and a crossover, chances are the impedance curve of the HA-SZ2000 isn't very flat, and this means that it should be driven by an amp with an output impedance much lower than the headphone impedance to avoid issues with damping factor or frequency response. Ideally, you'd want your amp to have an output impedance of <1 ohm or so for these headphones, and this is where a lot of sound cards and devices have the opportunity to fall flat. As long as your amp has a low output impedance though, all the other specs should be really easy to attain. 16mW and half a volt is not a difficult thing to achieve.
For example, an O2 can push a little over 250mW and around 2V into a 15 ohm load. This would be enough to cleanly drive them to 132dB, which would promptly damage your hearing and/or blow the headphones.
As long as you aren't boosting the bass above the 120dB figure I calculated above, you still won't need more than 16mW (unless the headphones have a bass rolloff, in which case you might need more power if you're trying to compensate for it).