The speed that will produce the best burn will depend on the media and the writer. That *may* be 4X. Equally it may not. It is a question of burning a 'signal' that the reader will be able to handle. Each
writer/media combination will produce a *slightly* different result. That difference can be sufficient to enable or prevent accurate reading. With a suitable combination, the writer will produce readable discs at the fastest speed it is capable of writing.
Newer CD players are capable of handling the minor variations(jitters) without problem. However, if the CD player is old, you may have to burn at lower speed to allow the player to reproduce sound with good quality...
Not sure if you can change speed in Nero, but try making an Audio CD using Windows Media Player or MusicMatch Jukebox, etc... Since they are specifically for audio cds, you may be able to burn at lower speed...
Arun
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