As we talked already, but this is what Effect and I use, though I currently have the 2012 edition while Effect is using the older:
Standard Edition AX720:
2012 Edition AX720:
They are $140 AUD, The specs are the same for the different editions, just cosmedic features, e.g the 2012 swivels and the amp looks different.
The specs are as follows:
Speaker Diameter: 40mm
Frequency Response: 25Hz-22kHz
THD: -97dB
Cable Length: 12ft / 3.7m
Xbox Live Port: Yes
Xbox 360 Audio Input Type: RCA
It comes with:
7.1 Surround Headset
Digital Decoder Box with Stand
In-Line Audio Controller
Removable Microphone
Headset Connector Cable
Optical Cable
USB Cable
Digital Audio Adapter
PC Adapter (Europe only)