How to make perfect sound loops?

[Drama!]

Hello.

I need some help looping .WAV files before converting them to .ADX.

I use the tool called "adxencd", and the output is something like this:

Input sound data file: 'SONG01_00000.wav'
ADX Compressed data file : 'SONG01_00000.adx'
Sampling frequency : 44100 Hz = Input sound data
No. of channels : 2
Input audio sample : 284666 smpl = 6.0 sec <44100 Hz>
ADX output sample : 284666 smpl(Blk:284672 smpl) = 6.0 sec <44100 Hz>
....................

As some of you can discover, this is one of the sound files from Crazy Taxi 1 (extracted from SONG01.AFS).
I wanted to replace with another tune, so I´m playing with this tool.
The question is, WHICH number I need to make a perfect loop, in the flat "-lpe"

adxencd SONG01_00000.wav -lps0 -lpe284666

or

adxencd SONG01_00000.wav -lps0 -lpe284672

?

Thanks