Quote:
Originally Posted by

**Stillhart**
Hi all,

So I suppose I should probably go back and read all 30+ pages, but I was hoping maybe i could just ask here and not get too much guff. I just learned about this device and it seems to have some nice features. I'm curious about two things:

1 - Will the base model (the 450mW) be sufficient to drive the AKG Q701? I believe they're around 50-60 ohms but they're notoriously hard to drive.

2 - When can we expect normal (non Kickstarter) pre-orders to ship?

Thanks in advance!

P = V^2 / R

0.450 W = VRMS^2 / 16 Ω

sqrt(7.2 VRMS^2) = VRMS = 2.68 V

Using the measurements from Innerfidelity for the Q 701:

P = 2.68VRMS^2 / 60 Ω

P = 0.12 W = 120 mW

P = sensitivity * 2^X

120 mW = 1.68 mW * 2^X

log(71.42) / log(2) = X = 6.15

Max dB SPL = 90 dB SPL + 3 dB SPL * X = 90 dB SPL + 3 dB SPL * 6.15 = 108.4 dB SPL

That should be sufficiently loud based on the voltage specification, but the amp may be current limited, so it depends on how much current the Geek Out's amp can put out.