Question about Jensen XA4150 Car Audio Amplifier

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Missing Input plug

I misplaced the high input plug and am using a generic.Can you identify the incoming terminal conections on board?

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  • Rcharles Apr 10, 2008

    Thanks I appreciate your help!

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I wouldnt use that generic if i were you. i would go out and get a high low capacitor and hook it up behind ur head unit. then u can run ur rcas back to youre amp asnd turn on ur hpf. and ull get all highs and no lows

Posted on Apr 10, 2008

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High power level input from speakers rather than a low level source such as line input

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Hooking up system using HI-INPUT amp wires.


This may sound dumb, but are there any other inputs left on the amp? Most amps that i have worked with have a special set of inputs for high input. (by high input you mean speaker level right?) If those exist the obvious answer is to use those. They should be labeled, so just hook them up according to them. You may need a special adapter from the amp manufacturer. If you dont have any high level inputs or any not broken inputs left you have two options. You can either A: junk the amp or B: open it up and solder new connectors back on. (it sounds harder than it really is. There are four large pieces of metal to solder onto the board for a set of inputs)

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Hello gmb_66,

You did not specify exactly which Jensen amp you have. None of the Jensen PowerPlus series I found had high-level inputs. You can go here and select your amp to download the manual. They should also have the connector for speaker inputs.

Most amps that have both high-level and RCA inputs allow you to use one or the other, but not both at the same time. If your head unit has RCA ourputs, those would be the ones to use, because they generally provide a cleaner signal to the amp with less noise.

Hope this helps.


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1 Answer

What to do


Hello dodgeram1980,

If you are not getting sound from any of the 4 channels, I'd suspect that either the amp is not getting an input signal or the amp itself is faulty.

Here's the "no sound" troubleshooting step-by-step procedure from the JL manual:

1) Check the input signal using an AC voltmeter to measure the
voltage from the source unit while an appropriate test tone is
played through the source unit (disconnect the input cables
from the amplifier prior to this test). The frequency used should be in the range that is to be amplified by the amplifier (example; 50 Hz for a sub bass application or 1 kHz for a full range / high-pass application). A steady, sufficient voltage (between 200mV and 5.O-volts) should be present at the output of the signal cables.

2) Check the output of the amplifier. Using the procedure explained
in the previous check item (after plugging the input cables back into the amplifier) test for output at the speaker outputs of the amplifier. Unless you enjoy test tones at high levels, it is a good idea to remove the Speaker Connector Plugs from the amplifier while doing this. Turn the volume up approximately half way. 5V or more should be measured at the speaker outputs. This output level can vary greatly between amplifiers but it should not be in the millivolt range with the source unit at half volume. If you are reading
sufficient voltage, check your speaker connections as explained below.

3) Check to ensure that the speaker wires are making a good
connection with the metal inside the Speaker Connector Plugs. The speaker wire connectors are designed to accept up to 12 AWG wire. Make sure to strip the wire to allow for a sufficient connection with the metal inside each terminal.

Hope this helps.

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1 Answer

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1 Answer

Hi input


High input is used for amping up doorspeakers if your headunit doesnt have enough preouts

for instance you would connect up the rear speakers to the high input lead acting as a rca

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1 Answer

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1 Answer

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3 Answers

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Hi, Jensen is under different ownership from when your amp was made, so it's unlikely that you'll find a replacement plug for the high-level input. A high-low converter is also called a line-out converter. It's a device that connects to the speaker wires and changes the signal to a low-level RCA connection. This allows you to use the amp's RCA plugs with your speaker wiring (through RCA signal cables). A line-out converter should be available any place that sells car audio accessories.

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