Is there a test that i can do to test my sub to see how many ohm's they are? They are form xs cargo and it doesn't say anywhere on the sub of how many ohm's.
Those are multimeters. You want a DMM (digital multimeter) or a VOM (more basic). A DMM does all the functions of a VOM (volt-ohm-millammeter) plus a few more.
When you measure a sub with a DMM, you're not technically measuring impedance, you're measuring DCR...which is frequency dependent. That's why VC impedance is a "nominal" measurement - it depends on the VC position.