The PC 320 G4ME is a stereo headset and the PC 323D builds on that design with virtual 7.1. As with their more expensive models Sennheiser have located the volume dial on the right ear cup rather than part way down the cable. We simply rotate to increase or decrease the level.
In terms of key features here is what Sennheiser have to say about the headset:
"The PC 323D gaming headset puts you in the center of the action with Dolby® Headphone and ProLogic® IIx. Their 7.1-channel game audio lets you pinpoint even the slightest sounds. The adjusting, super-comfortable CircleFlex™ ear cups, pro noise canceling microphone for clear teammate talk and other must-have features round out the package."
Looking past the marketing to the more detailed specifications each earpiece on the PC 323D has a frequency response of 15-23,000Hz with an impedance of 32 Ohms and sound pressure level of 113dB.
Over on the left side of the headset we have the mic location. The action as the mic is moved up or down has a good level of resistance, ensuring that it never falls further than the users chosen location. Like the volume control which is located on the right cup the mute function for the mic is performed on the left cup, position it vertically and mute engages, move to a speaking position and mute is turned off. As well as moving vertically the mic can be moved closer or further away from the mouth thanks to a flexible rubber section mid-way along the arm.
In terms of specification the noise cancelling mic present on this headset has a 2kOhm impedance and 70-15,000Hz frequency response with sensitivity of -38dBV/PA.
This is a headband style headset and can be extended by increasing the length of either side by a simple pull. There are around 16 individual lengths which can be selected on each side increasing the size by around 2 inches. The headband features a fabric cushioned section as do the ear cups and connecting the PC 323D G4ME to the controller is a 2m long cable which splits over the last few inches to two gold plated 3.5mm connectors. Finally, the PC 323D weighs 230g.