which performs better at these loads..?

[noob with an RS 10+ year member]

orion 1200D in 1 ohm - 1200 rated watts

viper D2500.1 in 4 ohms - 1500 rated watts

(going to power a single 12" idMAX in a ported enclosure)

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[nikosbuddy 5,000+ posts]

id go viper, just incase you decide to upgrade...//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Mike