Anonymous made a comment to my previous post: "These are the first measured of sensitivity or comparasions with other SDR RX with AM signal in the world on Perseus?"
Who knows. Very few people find it interesting or worthwhile to measure a radio's sensitivity. But then very few people own a signal generator which is what you need to do the job. Neither RF Space (SDR-IQ) nor Microtelecom (Perseus) have officially available AM sensitivity data. Instead they have MDS numbers for CW and SSB. The Perseus claims an MDS of -131 dBm in CW, 500 Hz bandwidth, and -124 dBm in SSB, 2.4 kHz bandwidth. Similar data for the SDR-IQ is -127 dBm in CW, 500 Hz bandwidth (no data given for SSB). So in theory (because I think these are calculated figures, not measured), 4 dB advantage Perseus.
There is no substitute for measurements though. I know of two AM sensitivity measurements on the SDR-IQ, mine and Dallas Lankford's. We both got -102 dBm or 1.8uV. Nico Palermo calculated the Perseus AM sensitivity for me to -102 dBm. A measurement will probably end up in that range, possibly 1-3 dB lower if my ears heard correctly. I believe that a correct Perseus sensitivity measurement will soon be done by Dallas Lankford.
Still, numbers, be they calculated or measured, will never replace real-world experience. I have yet to compare the two SDRs enough to declare a winner, and I'm not sure I want to put one ahead of the other anyway. It is highly unlikely that I will be able to hear a station on one radio that I can't hear on the other. That said, the Perseus appears to have AM bandwidth configuration options available that will dwarf most if not all other radios.