Acoustic equalization in a vehicle, normal or faulty?
I need an expert opinion. The audio system in my vehicle, which is new to me, does not sound like it is functioning correctly. What I perceive is that there is very little midrange coming out of the system. I do not have experience in development or tuning of acoustics in a vehicle and so I would like to hear the opinion of experts on this question: Are the frequency response curves that I have attached the result of a correctly operating system, or is the system likely faulty?
These measurements were made by attaching an audio oscillator to the aux input of the head unit, and then plotting the response at four speaker locations. The larger "door" speakers were replaced by resistor loads for these plots, but this was difficult for the dash tweeters, so I left the speakers as loads. The responses are measured using an audio voltmeter connected across the loads. Both the audio oscillator and the audio voltmeter have flat frequency response.