The Power Mac G4 (Mirrored Drive Doors) computer has a line-in stereo sound input port on the back panel. The audio inputs are designed to accept high-level audio signals: 2 Vrms or +8 dbu, which is the standard output level from CD and DVD players. Low level consumer products operating below -10 dbu require a pre-amplifier. The output level of some consumer audio devices is lower, often 0.1 Vrms or -10 dbu. Sound recordings made on the Power Mac G4 with such low-level devices have more noise than those made with high-level devices.
Examples of devices that provide line-level input include:
- CD players
- tape decks
- self-powered microphones
- DVD players
Note: While the Apple PlainTalk mic included with earlier Power Macintosh computers does provide line-level input, it does not use a standard 3.5 mm stereo miniplug, and cannot be used with the Power Mac G4 (Mirrored Drive Doors) audio line-in port.
The earlier Apple Omnidirectional microphone will also not work, because it provides mic-level input instead of the required line-level input.
Check the specifications of the sound input device you are connecting to determine if it provides the proper line-level input.
Griffin Technology's iMic adapter allows the use of most mic-level sound input devices. Contact Griffin for additional compatibility information.
Important: Information about products not manufactured by Apple is provided for information purposes only, and does not constitute Apple's recommendation or endorsement. Please contact the vendor for additional information.
Document 17159, "
Locating Vendor Information" can help you search for a particular vendor's address and phone number.
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