Zapco Z-150.4 vs Massive Audio D800.4

[corysquires]

I know we are comparing amplifiers with an $800 difference in price. Having said that, what makes the Zapco all that much better? if anything...

I currently own 4 massive audio amps 2 D800.4 and 2 D2400's. I think they sound great, to the best of my knowledge they push my system just fine... (PHD 3 Way Active & 2 SA 12's) all thou I am curious if replacing the Massive amps with Zapco's will really make a noticeable difference in terms of sound quality, for sure in respectability ... and lastly would it be justifiable to replace $800 in Massive amps and shell out $2000 for the Zapco's (Z150.6 & Z3K)

So what do you all think?

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[tat2bass 10+ year member]

I don't think it's worth it. Unless you are competing in lanes, it's not worth the money. But driving down the road with everything factored in, you wouldn't be able to hear any differences that would justify that kind of money.