I have the LH Labs Geek Out 450mw. works fine when connected to my win7 laptop.
Currently there is an issue with Android phones (mine is S4) even with UAPP, hope it may be solved soon by a Geek firmwate update.
I did encounter a serious problem though:
- When connecting to my S4 via a Y-OTG cable http://www.tvc-mall.com/details/Micro-USB-Host-OTG-Cable-with-Micro-USB-Power-for-Samsung-i9100-i9300-i9220-i9250-MCH-382/ and providing power to the Geek Out, via an external battery (I usually use to charge my phone); my Shure SE846 earphones are getting rather HOT (also happens with other iems). When connecting the Geek Out and phone via an OTG cable to a USB hub and supplying power (from the battery) to the HUB, all is normal (nothing gets hot).
- Can you explain what's the issue with the Y-OTG cable?
As far as I know, according to the USB Battery Charging 1.2 specification, a USB-Y cable is as follows:
An Android USB OTG device is configured to USB host mode supplying or drawing power, or USB peripheral mode by ACA/OTG software/hardware measuring the value of the ID resistance of the USB interface.
According to the value of the ID resistance:
. the Android device should act as a USB host, interwork with the USB DAC acting as a USB peripheral, and supply power to the bus-powered USB DAC
. the Android device should act as a standalone USB peripheral, and draw power from an external battery
. the Android device should act as a USB peripheral, interwork with a USB host, and draw power from an external power source
. the Android device should act as a USB host, interwork with the USB DAC acting as a USB peripheral, and draw power from an external battery or another external power supply.
The issue is that Samsung, like every other Android device maker, uses a standard USB concept (i.e. USB ACA), uses standard USB components (i.e. USB OTG – ACA components), but doesn't use standard ACA resistance values!
More, Samsung has another proprietary USB ACA mode: analog USB audio out with some value of the ID resistance.
So, everything could happen if the value of the ID resistance is not one of the Samsung values.
I think it is better in your use case to get a USB-OTG Y cable from Elijah Audio: it has a price, but the guy seems to be very meticulous.
The value of the ID resistance is 0 ohm (i.e. ID grounded, a standard / Samsung value): the Android device is configured as USB host, but it doesn't supply power to the USB DAC which drains power from the external battery.