BeppoSAX observations of the Seyfert galaxies Mrk 509 and MCG +8-11-11 are presented .
Earlier evidence of a soft excess in Mrk 509 is confirmed .
This excess is found to be better represented by a power law than by a black body : with a photon slope \Gamma _ { s } of 2.5 , its extrapolation matches the flux recorded in the far UV .
An ASCA observation , which appeared to exclude the presence of the excess while showing instead evidence of a warm absorber , turns out to be compatible with the coexistence of the excess seen with BeppoSAX and of the warm absorber .
The hard power law of Mrk 509 is seen for the first time to be affected by a cut–off at high energies , with an e–folding energy of about 70 keV .
In MCG +8-11-11 the cut–off is found at about 170 keV , consistent within the combined errors with a previous estimate from a ASCA+OSSE/CGRO observation .
In both objects the reflection component is clearly detected .
In Mrk 509 its strength , together with that of the iron K line , indicates a solid angle \Omega , subtended by the reprocessing gas in the accretion disk , much less than 2 \pi , but lacking a valid constraint on the inclination angle this evidence is not as convincing as that found with BeppoSAX in IC 4329A .
In MCG +8-11-11 the same parameters are instead consistent with \Omega =2 \pi , but the comparison with an ASCA observation , when the flux level was about 2.5 times weaker , suggests that a substantial fraction of the angle might be associated with gas farther out than the accretion disk .