I dont understand. The laser's power is still the same, irespective of whether you use mask or recordable cd's. But if you are talking about the reflective laser beem, then yes, there will be a difference in the reflective lazer power, but as the "audio information" is digital, this will not make any difference, aslong as the signal strength is powerful enough for the sensor to pick up the data, which is the case otherwise recordable cd's would not work period....
The signal level you are refering has nothing to do with why some recordable cd's are less reliable.
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Yes I am talking about the received signal.
If you have a laser that is on it's way out then it's output power will be less and therefore the received signal strength will be less. You get to a stage where the received signal is not strong enough for the data to be detected correctly. The stage is earlier with CD-Rs because the received signal strength is less in the first place, as I said before about 70-80%.