Ok, I think I see why you are concerned. Are you thinking that LPCM 88.2 kHz will deliver an 88.2 kHz frequency which is way beyond your speaker's capability and could damage them? Have no fear as that is not what that spec means.
LPCM 88.2 kHz means Linear Pulse Code Modulation with a sampling frequency off 88.2 kHz. PCM is raw digital audio - a sequence of numbers (but that is irrelevant for the moment).
Digital audio is created by 'sampling' an analog waveform a certain number of times per second. At each instant in time, the amplitude of the signal at that point is calculated and that becomes the sample value. So 88.2 kHz means that the original analog signal was sampled 88,200 times per second and thusly there are 88,200 samples for every second of audio. If the format happens to be say 7.1 LPCM 88.2 kHz then there are 8 distinct channels - each with 88,200 samples per second - so the receiver sees 8*88,200 samples per second (which incidentally is why such a format cannot be passed over the s/pdif digital interface, it's way too much data).
Now when the receiver gets that PCM data stream it converts it back into analog, amplifies it, and sends that to the speakers. So your speakers won't see an analog frequency of 88.2 kHz - they'll see whatever frequencies were part of the recording. Given that human hearing is generally 20 Hz - 20 kHz, it's rare that any frequencies much beyond 20 kHz get recorded.
You have nothing to worry about.
