I am asking this not because I am going to order their top-of-the-line SDS or ES1, but I am asking this because of my Single power Extreme. It's a nice experience to order my extreme from Single power initially when they provided the discount for head-fiers. I received mine after about 2 months...

i just have the plan to purchase one pair for my H340 to replace A8 for upgrade. i am just wondering if it will be alright with H340 and will its performance be as usual? or maybe i should just try 4P instead? any assistance will be highly appreciated~~~