[28-80Hz Issue]

Turns out it's the acoustis. I have been in two Kias. Mine and another one. Both horrible.

 

The person in charge of the interior acoustic properties is nonexistent to this vehicle producer.

[28-80Hz Issue]

I will measure a 20Hz-200Hz sweep in REW.

[28-80Hz Issue]

The vehicle is a Kia Rio UB III 2016, European Edition, 3 Doors.

 

Worth mentioning, once door panels&co. are taken out, that the inside-design looks very strange, such that there is like a tunnel space on both left and right sides, when looking from the trunk, between the trunk and the space where the back-door "is", you could put your hand from the trunk and come to the side all the way to where the back door is.

 

- would not be a box issue, the same subwoofer in the same box sounds good in another car/in another enclosed space

- a Home-Subwoofer instead, by keeping it connected to its home amplifier sounds similar

- inverting the phase + time alignment + position settings + etc: slight differences, but with the same overwhelming feeling

 

If when changing the listening position (like when I lay flat), the bass evens out and seems normal, wouldn't that suggest an acoustic issue?

[28-80Hz Issue]

Interior Length: ~2,5m

Interior Height: ~1,2m

Interior Depth: ~1,7m

 

Scenario1: Listening position: Driver/Passenger seat, sitting normal; Subwoofer alone playing:

15-27Hz: good

28-55Hz: undefined/muddy/muffled/doubled/overwhelming

55-80Hz: dipped/canceled/almost non-existent

 

Scenario2: Listening position: Driver/Passenger seat, laying flat; Subwoofer alone playing:

15-80Hz: good

 

Tried without any success:

-changing subwoofer position

-soundproofing everything but the ceiling

 

Conclusions:

-it's not a crossover issue

-it's an acoustic issue

 

How would you approach this issue?