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Does anyone know if it would be worth while for me to buy this to use with my Dragonfly Red? The Dragonfly Red already has an amp built in, but will it provide enough power for AKG K7xx and Sennheiser 6xx?
Would there be any improvement in sound if I add this O2 to the Dragonfly Red?
It will drive either set of cans easily. I have never listened to a Dragonfly.
Thanks Jimmybuckets! Nice name by the way. I'm a huge Timberwolves fan, I'm pretty excited about Butler going to the Wolves haha
Dragonfly Red runs HD 650 just fine, but struggled a bit with my K7XX. O2 will drive both of them with plenty of headroom to spare.
Thanks Shakkhor. I've heard some others saying the same as you, that the AKG K7xx is harder to drive than the Sennheiser hd650. It's the opposite of what I'd expect if I only base it off ohms, because the hd650 is higher ohm than the AKG K7xx. Is it the current level that makes the akgs harder to drive?
The HD650 will require a lot of power to sound their best, but it's more to do that HD650 are very forgiving cans and will sound good regardless of how you drive it. OTOH the AKG K7xx is easier to drive but is amp picky, they need to be amped effectively to sound their best, any less and they will suck.
Thanks Jackula. The Dragonfly Red outputs 2.1v. Is that sufficient ampage to make the AKG 7xx sound their best? My akgs are going to arrive next week so if I need a new amp I want to order it soonish. Thanks
2.1 is the voltage, not the amperage. They don't list the total power output nor the output impedance so I can't apply ohms law to get the amperage. What I can assume is it's very low and probably unsuitable for the AKG K7XX :(
If you get the O2, you'll be able to use your Dragonfly Red as a DAC, so it's not totally wasted.
I believe so. Impedance is just half of the story; the other half is sensitivity which is around 93 dB/mW for the K7XX.
Sensitivity and efficiency ratings have no bearing on actual sound quality, as they are a measure of volume potential while making significant compromises in sound quality.
That's not to say these ratings are completely useless, as they provide a relative indicator. That is, relative to a headphone that's 90dB/mW, it would take half the power to get the K7xx to the same volume.