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i use the tn52's and run one half of an alpine mtvf545 at 120 watts rms, of which a tiny fraction is actually powering the tweeters, aka you will be just fine with your 75 watts/channel
thanks , I just bi amped my k2ps on 2 jl 300/2s and I must say it added a ton of clairity . Just in case anyone cares the focal tn52s are 8ohm cutting down the jl's 150/2 to 75/2 .