I am a novice (i.e., shaved head, waiting to take my vows) in this Decware order, but I have to volunteer here, the Japanese caption for the 25th anniversary amp says "Extremely good amplification" but my understanding is that other than the disadvantages of relatively low power, the 25th is THE BEST amplification (silence in the pews!) that Decware offers. "The VERY BEST amplification."

That would be 最高の増幅.

究極の増幅 (The Ultimate Amplification) would be even better, in Japanese. The pinnacle. 最高 is way overused these days.

Of course there are other options, such as 体外離脱の増幅 (out of body amplification) or 顔面が溶ける増幅 (face-melting amplification), etc.

I must close here and retire to my cell to do penance before the List View.