Currently I am a beginner using a Yamaha YTR2335 which has an ML bore of 0.459" according to the specs. I came across a large bore trumpet, a Jupiter XO1604S that I am kind of interested in buying, but this is the large bore model, bore size 0.462". According to my Rough Guide to Trumpet booklet, it says : "In order to play a trumpet with a large bore, you need a good embrochure and good breath control. If you are just beginning, you're usually best off with a medium-sized bore, about 0.455" Reading the above gives me the idea that the large bore trumpet, like the Jupiter I am considering buying is only suitable for accomplished or advanced players, and therefore it would be inadvisable for a newbie like me to buy such a trumpet. Would this be a correct concluscion? Second question is, what can one expect, in terms of playing demands, moving from the ML bore to the L bore. Will we need a lot more air and lung and lip power, or is the difference not that great? Also any comments on the Jupiter XO1604S specifically as a good/bad quality trumpet would be welcomed, for those who own it, or have had the chance to play it. Thanks everybody for your advice in this matter.