Hello @babak147 Welcome to the community! Check out New Here? This Is The Spot To Introduce Yourself So people can get to know you! 
@angstorms has created a good compilation of requirements and tests of his owns with his susvara.
This can be of reference for your AMP and AMP Specifications.
The 789 and the DX7 might fall short (See this for 789 reference: HiFiMan Susvara Over-Ear Planar Headphone - Official Thread). I am not too sure about the Phonitor 2, but SPL Phonitor is well regarded here and looking at the specs it might do the job.