Measuring a factory system eq curve?

[P0234]

I have a newer Chevy and it seems to have quite a bit of bass dropoff once the volume gets past the half way mark. Since replacing the head unit is out of the question, I'm trying to see what I'm working with.

Is there any reasonably cheap way to measure frequency rolloff at the amp output? I know I can measure it using an RTA with the speakers but I'm more interested in what is going to the speakers.

I'm not averse to spending $50 on something to measure it, I already have a mutimeter.

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[LosIsATool 5,000+ posts]

Signal RTA

 

[Jeffdachef 5,000+ posts]

dayton RTA mic (20 bucks) and RTA software like REW (free)

 

[LosIsATool 5,000+ posts]

dayton RTA mic (20 bucks) and RTA software like REW (free)

That’s not what he is talking about.

 

[P0234]

Signal RTA

Thanks for pointing me in the right direction. This looks like it might get the job done.

https://www.kicker.com/app/misc/support/tech/tech_papers/docs/SimpleRTAForTestingSignalOnPoweredOutputsAndHowToUseIt.pdf

 

[LosIsATool 5,000+ posts]

Thanks for pointing me in the right direction. This looks like it might get the job done.
https://www.kicker.com/app/misc/support/tech/tech_papers/docs/SimpleRTAForTestingSignalOnPoweredOutputsAndHowToUseIt.pdf

When it comes time to fix it look for something with input EQ.