My SO has noticed a sudden, and very large, spike in his electricity bill. His roommate has a band that practices at their house about 2-3 hours a week. Could this explain the hike in electricity. The bands electrical equipment consists of:
1 microphone attatched to 2 - 15 in. speakers( JBL brand)
1 Line 6 Spider Guitar Amplifier
1 Marshall Guitar Cabinet ( I don’t know the model)
1 Bass guitar cabinet (with 6 12" speakers).
Any help would be appreciated and specific sources would be very helpful in presenting the case to his roommate.