Yes burn speed is Important. A burn speed of 4x is the maximum you want to use when your trying to make discs that are compatible with all players. You also want to make sure it is a "close session" burn. It has to be in the proper format as well. You have to be sure that if you are using mp3s that they are being decompressed to .cda format. That will depend on you software and options. It cannot be a mp3 cd. The "book" type of cds you use is also a factor from what I remember. Certain "book" formats will be less likely to play in all players. Sorry, Its been years since iv'e burned a disc.
Toreador Red 05' FX4
4.0 4x4 A/Tran Ext.Cab Daily Driver. Nomads, BFG M/T's
Alpine 9857, JBL MS-8 DSP, US Acoustics 2x80w & 2x100w, Vifa 1" XT25 Dual Ring Radiator Tweeters 3k+ 24db slope, Dayton Audio 7" RS180-4 Mid-woofers 100Hz-3k 24db slope, 500w rms Kenwood Class-D Mono - JBL 10" GTO1014 Sealed. 100Hz- 12db slope