NB50

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http://www.youtube.com/watch?v=MRiRzGZP8xY

Unfortunately you cant do it that way and be anywhere remotely accurate. The potentiometers used are not linear. If you want to set a crossover to a specific frequency. Disconnect the speakers, and turn the crossover to min or max depending on what cross over you are setting. Play the frequency that you want the crossover set to. Doesn't have to be a high volume. Measure the AC volts on the outputs of the amplifier. lets say its 10VAC. Now find the -3db point, multiply the voltage you measured by .707. 10 X .707 = 7.07VAC Now turn the crossover knob up or down to reach 7.07VAC. Now your filter is set to a specific frequency you want.

He needs to keep box volume the same also.

Have you measured the gap or are you just going by eye measurements?

Insane sharpie job by my cousin, car was then clear coated to protect it.

Nice small amplifier

Are you sure there wasn't reducers in the fuse block. I know kicker does that, puts 8awg reducers in the block so you can use it for 4 gauge or 8 all you do is remove them to use it for 4 gauge.

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How high is the volume when you turn on the car? I believe they have a protection circuit that will do that if the volume is to huh when you first turn on the amp. My leviathan did it and states in the manual of the circuit.

$125 shipped CONUS

Touch the multimeters leads together and see what it reads.