Marantz SA8400: SACD Filter

I've recently bought a Marantz SA8400 sacd player (not to be confused with the DV8400 universal player) and am wondering about the 'sacd selectable filter', a switch on the back which can be set to 'standard' or 'custom' (with 'standard' as default).

Reading the manual, it appears the 'custom' switch allows higher freqencies to pass through the analog output but warns that this can damage the amp and/or speakers if they're not able to cope with the signal. Can anyone tell me whether my Marantz SR9300 receiver will handle the higher signal? I also have Elac 207.2 speakers which are rated up to 50Khz - will they be okay?

I'd hate to experiment and ruin the receiver and/or speakers! Thanks.