PG RSD10d DVC amp help please

[protocol_droid 10+ year member]

okay, I have a refurb kx600.1 powering two of the aforementioned subs. I believe they are 4ohms, however I notice lately when the volume's turned up, the subs cut out until sound is turned down. I had a knucklehead install my subs and the amp. I had no clue about dvc and what it meant. He apparently didn't either and I"m unsure how he wired it. Anyhow, I'd like a newer amp perhaps a 1000.1 to power these. I saw on another post the zx750.1 not working with dvc 4 ohm. I need to be schooled as to how my kx600.1 or even higher are okay for these subs. Any recommendations on amps, less than 350 or explanations of these dvc's? Thanks from a super newbie.

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