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Front speakers should be at the same height, angle and distance relative to the listener. You will obtain best imaging if the distance between you and speakers are about the same distance as between the speakers. A typical multimedia set-up, with the speakers placed just to either side of the computer monitor, is ideal for stereo or quad listening. However, if your system has a center speaker, then it is advisable to move the left and right front speakers further apart, maintaining equal distance from the listening position. Surround speakers should be placed behind the listener, and ideally be no further than the front speakers from the listener. They also need to be at the same height and angle as the front speakers. 7.1.2. Ideal Listening Scenario (Headphones) When using headphones, many of the potential problems associated with speaker listening are essentially eliminated. For example, you are automatically positioned in the center, and if you move around, this doesn’t change your position relative to the speakers. 7.1.3. Avoid Reflective Surfaces (Speakers) If possible, keep your speakers away from reflective surfaces. For example, if your setup is in a corner and one speaker is very close to a sidewall, this will degrade imaging. This is because sound waves will bounce off the wall and arrive at your ears slightly later than the waves originating directly from the speaker. This is true of any environment except an anechoic (echo-free) chamber. However, when the surface is close to the speaker, the reflected sound energy will be only slightly delayed and still quite strong compared to the original, which will reduce the clarity of the signal you hear. The same can be true of placing your speakers directly on a hard desktop. If possible, elevate your speakers on stands so they are further away from the reflective surface. This will slightly improve the imaging and effects. 7.1.4. Balance the Speakers and Headphones Any imaging, including stereo, surround and especially 3D audio, can be degraded by left/right channel imbalances. If your speakers or amplifier(s) incorporate balance controls, we strongly recommend adjusting them to their center position. Many physical balance controls have a mark to identify the center position. If each speaker has separate volume controls, try to set them as equally as possible. You can use the Philips Sound Agent 2 test utility to help you judge the volume levels. This practice applies to headphones as well. PSC805 Aurilium™ Sound Processor Users Guide 35 Philips Sound Solutions 8. Appendix B, USB Hub Considerations 8.1. Introduction to USB Hub A hub is a USB device that uses one USB port for connection to a PC and typically provides four additional ports for connection to USB devices. The function is similar to an electrical plug expander or an extension cord with multiple receptacles. Some of the earlier computers have only two USB ports that are usually located on the backside of the computer. In this case if we have more than two USB devices for connection to the PC we need to use a USB hub. Using a hub not only provides more USB ports, but also provides easy access to the ports that are located in the back of the computer. Most newer computers have two USB ports in the back and two additional ports in the front. The front ports are usually concealed under a flip up or flip down cover. Refer to your PC document to locate these ports. A USB host controller card may be added to a computer if it does not have any USB ports at all. These cards need to be installed inside the computer in a PCI slot. 8.1.1. Power Limitation Hubs, like any USB device, may be bus-powered or self-powered. A self-powered hub has an external power supply, which plugs into an electrical outlet, and can provide maximum specified power to all its USB ports. A bus-powered hub draws power from the root USB port, and thus, it has limited power available to the connecting USB devices. 8.1.2. Bandwidth Limitation Issues Each USB port on the PC has a maximum bandwidth of 12 Mega-bits per second (Mbps). Different USB devices require different amount of bandwidth. Connecting more than two high bandwidth-demanding devices to a hub may cause degradation of functionality for some or all of the devices on that hub. For example, connecting a web camera and an audio device to the same hub may cause gaps in the displayed video, or gaps in the audio stream. It may even cause the devices not to function at all. This usually happens to the device that is used last when other USB devices are active. PSC805 Aurilium™ Sound Processor Users Guide 36 Philips Sound Solutions 9. Appendix C, Trouble Shooting This appendix covers some of the basic mistakes and pitfalls you might encounter. V No Sound is coming out 1. Check the speakers. a. Ensure the speakers are plugged into the back of the Aurilium. b. Ensure the speaker power supply plugged into the AC power outlet, or if they use batteries, try new batteries. c. Ensure ...

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