Has anyone been able to find the specs for the amplifier in the Dragonfly Red? The only info I've been able to find is the 2.1v output and that it is ESS's latest amp.
I'm mainly wondering about the other specs of the amplifier so I can calculate how well the DFR is driving my AKG K7xx, which is 62 ohm with a sensitivity level of 105 db @ 1v. I'm new to this, but I believe I need more info about the DFR amp to calculate damping factor and other things.
The DFR should/will provide your AKGs a dampening factor of 62+ and should/will easily drive your AKG K7XX to ~111 peak dB SPL. A good rule of thumb regarding dampening factor (amp output impedance vs headphone impedance) is striving for a damping factor of at least 8 (commonly referred to as the 1/8th rule). A damping factor of 20+ provides an excellent margin of safety in regards to dampening so you are well covered with 62+!
AQ DragonFly Red (DFR) - Power Output (Vmax) & Impedance: 2.1 Vrms (5.94 Vp-p) @ <1 ohm
AKG K7XX - Impedance & Sensitivity: 62 ohms @ 92.9 db/mW SPL (105 dB/V SPL)
I.) DFR Power Output with K7XX: (2.1 Vrms * 2.1 Vrms)/62 ohms = 71.13 mW
II.) SPL from Power for K7XX & DFR: 92.9 dB/mW + 10 * LOG (71.13 mW) = 111.4 peak dB SPL
III.) SPL from Voltage for K7XX & DFR: 105 dB/V + 20 * LOG (2.1 Vrms) = 111.4 peak dB SPL
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