sony head unit

[cory51191 10+ year member]

this is my head unit http://www.jr.com/sony/pe/SON_CDXGT330/

and this is my amp http://www.rickiesdiscountelectronics.com/fusion-powerplant-ppam20001-1-channel-1-ohm-stable-2000-watt-amplifier-163.html

and i have 2 of these subs wired to the amp on a 1ohm load http://www.sonicelectronix.com/item_9357_Hifonics+HFi+12D4.html?utm_source=froogle&utm_medium=organic&utm_campaign=froogle

both links have list of specs. what should i tune the "LEVEL" dial to on the amp (0.2 - 8v)?

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