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FYI. My ORP iForce Max took 5.9 quarts at my 3333 miles first oil change. Brought it up to the second mark.

Pictures please. Really interested in where and how you mounted it and the amp.

We're on the same page. Way back in the day (1980s) I was an audio electronics engineer making active circuit (pre-digital days) sound processors for recording studios and AM/FM broadcast stations.

My preference is to set all the balance/fader controls to center/middle and all treble, bass controls to zero. Sounds the best to me and allows for the closest to the way the music was mixed and recorded. I get plenty of bass, highs and mids. Jazz and Bluegrass sound great.

But Toyota recommends 5w-30 in these exact same engines in Europe and Australia (in warm/hot weather). The claim is Toyota doesn't do that in US sold vehicles because of fuel efficiency regulations. IOW, not as good for the engine, just for compliance.

Just saw a YouTube that claims Toyota recommends 0w-20 due to fuel economy regulations, but that 5W-30 is recommended in Europe and Australia in warm, hot climates because it's better protection for these high-heat turbo engines. Anyone use 5w-30 in summer and 0W-20 in cold weather months?

When you're turning down the front speakers by adjusting the fader all the way to the rear speakers, you're also turning down the subwoofer because the subwoofer is tied to the front speakers. It's as designed.

AI (ChatGPT): Question: 2025 TOyota 4Runner Off Road Premium comes with Premium sound, JBL speakers throughout with speakers in the rear door and a subwoofer in the cargo area. Sound system has a balance and fader controls. Is this a normal part of the design of the JBL sound system...

There is nothing for Toyota to fix. The JBL sound system is working as designed.

Wondering if deflating tires would have helped?

You can confirm by setting the fader at middle or even more towards the front and verifying the subwoofer is correct by playing a subwoofer test track and sticking your head into the back cargo area.

You all are assuming you think you know how the JBL sound system in the Toyota is designed to work. It's not as you expect: On Toyota/JBL systems (including current 4Runner, Tacoma, Tundra, Sequoia): • The subwoofer is tied to the “front” audio stage, not the rear channels. • When you move...

Thanks for the confirmation. That's what I thought. I think I'll get a pair just so I have them in case.

ECO. Off Road Premium iForce Max.

I'm old and stiff. I'd never ditch my ORP running boards, I depend on them.

One pair on the rear wheels only or two pairs with those chains on all four wheels?

Pictures? I'd love to see where you put it all and how it looks.

I find it funny that: it's a car, not a sound studio. Frankly, the obnoxious booming from other cars is not the mark of a good quality audio system in that car.

It's more possible, that some people's personal preferences and expectations regarding how a properly designed audio system should sound do not conform to the way a good system actually should sound.