I don't think so, but i haven't done an A/B comparison. The bass on the 4.5s only go down to about 70hz, if I remember correctly. That's not great. The Korg manual doesn't list the Freq specs, so I can't say for certain, but I was underwhelmed when I listened to the 4.5s. My favorite small-ish monitor is the BX5 from M-Audio. They sound fantastic for most keyboards. They are $300 a pair, and sometimes go on sale for $200.
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