@madavid0 perhaps you can spend some more time doing research and reading before bugging us again
here are two good starting points on this topic
http://www.6moons.com/audioreviews/stepup/primer.html
http://www.rothwellaudioproducts.co.uk/html/mc_step-up_transformers_explai.html
here are two good starting points on this topic
http://www.6moons.com/audioreviews/stepup/primer.html
http://www.rothwellaudioproducts.co.uk/html/mc_step-up_transformers_explai.html