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Power and Stand-by light alternate (JPA1150M)

posted by DYoung9 on Mar 27, 2008

I just bought a Jensen JPA1150M amplifier. I chose this one because of the specified frequency range (10Hz -100KHz).
I want to amplify an Amplitude Modulated signal in the 70KHz range. (Of course I'll have to demodulate this signal before I can hear it.)
#1 Should I be able to amplifiy it OK???

At this point I am just trying to get the amp to work on the bench using a FULLY charged Auto battery. I have the following connections and settings. 1 large 2 ohm Speaker (right channel), + Power,
Ground, REM (on back) connected to + Power, X-OVER at FULL, RCA connector into Right Low Input, 2 Volts Peak to Peak, 2 KHz, going into Right Low Input.
#2 What is happening is that the POWER and STAND-BY lights alternate. POWER on, I have output, STANDY-BY nothing. By truning the LEVEL down low I can keep it on. Does that sound right???

#3 Would I be better off with my input going into the high level input??? Any Suggestions or help is appreciated. Don

Comment by DYoung9, posted on Mar 29, 2008

Both channels do the same thing. As long as I don't set the LEVEL to high it seems to work and actually does what I wanted it to do. I'm just not sure I am getting the full output.

The other thing I have not been able to do is get output for a single speaker with negative LEFT jumpered to positive RIGHT and the speaker hooked up to the remaining two speaker terminals (+ LEFT, -RIGHT).
Thanks for the answer...
The AMP is supposed to be NEW.
What do you suggest now?

Comment by DYoung9, posted on Mar 30, 2008

I do remember seeing something in the manual that said it would NOT drive a 2 ohm load when bridged. So that explains that. Thanks!! I did look at the signal on a scope. With the actual signal I was feeding it it would be hard to see the clipping so if was clipping I didn't notice it. My input signal was just below 100KHz and continually modulated by about 1000Hz.
I've tested it for my application and it seems to be working for my purposes. I have a very directional receiver that I built and am using this as a balanced signal (one of the 3 methods I'm trying to detect voids with) system. Thanks very much for your input. Don't know if it will find the void yet but I'll know by the end of the week if one of the three works. Don

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Best Solution

posted on Mar 29, 2008

Guest

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Apprentice
Rating: 0%, 0 votes

You stated that you were using a 2 ohm speaker. If you have it bridged on that same speaker, it should go into protect.

Generally, it's not necessary to connect a jumper between the channels of an amp. If the bridging wires are L+ and R-, it shouldn't be causing any problem.

Have you looked at the signal on an oscilloscope to determine if you're driving the amp into hard clipping? If you are, that may be causing the amp to go into protection.

Rating Locked! (?) DYoung9 has rated this solution as Helpful

Solution #2

posted on Mar 29, 2008

pbabin

Rank:

Guru
Rating: 89%, 235 votes

It shouldn't be going into protection mode. Have you tried doing this on the other channel?

The high level input is for speaker level signal (as those you'd have if you were driving the amp from an OEM head unit).

Rating Locked! (?) DYoung9 has rated this solution as Helpful

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Power and Stand-by light alternate (JPA1150M)

Comment by DYoung9, posted on Mar 29, 2008

Comment by DYoung9, posted on Mar 30, 2008

Thank You!

Thank You!

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