Can you define which stock system you mean?
Base LT Stock or Bose Upgraded (most often in Premier) Stock? I think you mean the non-Bose system.
I would be interested in a comparison of the two.
I have the base LT system. Non-Bose.
I would also be interested to compare the two. Maybe if one hits a dealership lot around here, I will drag my laptop out there.
From your excellent audio measurements, what I would like to know is what exactly are your
audio modifications plans for your LT?
BTW, you didn't mention what you used as a reference source for your testing (Lossy or lossless audio?), but I think the LT audio system sucks. It's not as clean and sharp, both at the high ranges (that my old ears can detect now), and certainly in the low frequencies. FWIW, the Volvo S90 Bowers & Wilkins (B&W) high performance audio system was the best I have experienced.
How can I make my LT sound just like that...on the cheap?
My immediate plans are to just add a small sub and see how I fare in my current competition class. Long term... I will replace everything, add amps and DSP and utilize the triangle windows for a dedicated midrange driver.
I used a lossless, correlated pink noise file. Basically the standard for this type of measurement.
It's interesting that you say your ears can pick up high frequencies now as it's generally a given that HF hearing loss is a function of age. It *usually* gets progressively worse with age. But yes.. the low end is definitely lacking. I will admit that there isn't as much "detail" as I'd like, but the tonality and "realism" is good.
Man... that's not fair to compare our little base systems to the Volvo B&W! Lol. Or even the older ones with Dynaudio. Side note: My dedicated competition car is a Volvo s40.
Do you have the Bose or non-Bose? Because from what I gather, the Bose would be a much better platform since it uses a larger driver in the dash than the LT. The more octaves you can get coming from the dash, the better. So a 3" driver on the dash would wreck shop in the sound quality department. The majority of the world championship winning vehicles use a 3-4" midrange driver on the dash.
"On the cheap" is a relative term, but I reckon I could get the Bolt as good or better than the Volvo B&W for a couple grand. Maybe less.