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Resampling: No roll-off?

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k.e.:
Hi, I was removing some useless noise from HD files and used DSP settings Resampling to trim the files.

Now, I noticed that when using XLD and downsampling I always get a smooth roll-off. Depending on the settings starting at 19 kHz or higher. I played around with various settings and I always end up at -96 dB for 16 Bit at the highest frequency.

However, using JRiver MC23 there is no such roll-off. The audio track is just cut-off at whatever half the sampling rate I choose. So in my latest case I still have -55 dB samples at 24 kHz. It also doesn't matter whether I use SoX or not. That is quite weird because every SoX setting in XLD has a roll-off. Is there any way to achieve that in JRiver?

RD James:
It is a steep filter with a very late cutoff - and it might be best if the cutoff was reduced slightly - but it does roll-off rather than aliasing.
 
I generated some 24-bit 384kHz pink noise and resampled it to 16-bit 44.1kHz using Media Center and iZotope RX6, then used RX6's spectrum analyzer. The results are attached.

k.e.:
Thank you for the reply! That is good to know. It seems my analysis tool wasn't able to zoom in enough.

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