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  1. General Car Audio Discussion
    Can you use a multimeter to determine polarity on wire that is unlabeled (potentially while music on)? Wires were connected to factory rears to run to amp high level in. Those bare wires will power a test 5x7, just unsure of polarity when wiring my high level adapter.
  2. Car Audio Classifieds
    Product Brand & Model: TEST PRODUCTS INTERNATIONAL TPI 440 Condition of all items: Very good condition. Comes complete with the following accessories: • New rechargeable batteries (battery pack less than 8 months old, holds charge, costs over 40.00 just for battery pack) • Set of standard...
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