1980’s in car graphic EQ unbranded but there are similar versions made by Unic. It works but has two issues, the first is the LED power light flickers on and off. The second is that when connecting the negative speaker wire it shorts out. I believe the power negative is a common ground as the audio inputs work fine on just positive so the negatives may not be required as long as negative is grounded. Either way it works, it’s quite powerful for a small unit and is very rare. Condition is good for its age. There is no mounting bracket included. See photos for condition
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