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Try their website or a youtube video.

Zapco Car Audio... | Answered on May 29, 2016


If it goes into protect and your speakers and wires are good, chances are you have bad output transistors that will need to be replaces.

Zapco Reference... | Answered on May 16, 2014


are you sure you didnt wire the amplifier the front and rear to
left/ right?

check your deck settings to see that the rear speaker rca are connected.
check all wires are connected.
push the mono or bridge buttons are off.

provide more info.

Zapco I-450... | Answered on Nov 15, 2013


Go to this link and see page 47

http://www.zapco.com/files/Download/DCRef.pdf

Zapco Reference... | Answered on Jan 20, 2013


4-channel, 4 ohms: 4 x 50 Watts
4-channel, 2 ohms: 4 x 90Watts
Stereo, 4 ohms: 2 x 180 Watts
T.H.D. : Frequency Response: 10 - 25KHz
S/N Ratio: >90dB
Channel Separation: >50dB
Dimensions: 13"L x 9.9"W x 2.25"H

Zapco I450 Zapco I 450 iForce Series 4 Ch. 360 Watt Amplifier

Zapco I-450... | Answered on May 23, 2011

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