@michaellent : Only take in count that the calculators in the net for the tonearm/cartridge frequency resonance takes the compliance at 10hz not 100hz. So, the Kleos has a compliance around 19 cu.
Btw, I own the Kleos and never heard the Songbird ( I owned 6 years ago the top of the line Sumiko. ) and I can tell you that the Kleos is an excellent quality performer.
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.