Metered with SPL-LAB same song and I got a reading of 160.1 @36 hz in the port and 146 @48 hz in the cabin. Does this sound right for the difference in frequency readings? Or is the deeper bass getting trapped in the trunk? Let me know what you guys think, thanks.

Or the recording has different levels at different frequencies.

This was at the same volume and at the same part of the song.

This was at the same volume and at the same part of the song.

The recording has different levels at different frequencies.

Hint: Retest using test tones.

Pretty normal to get such a high score IN the port.

I get the higher db reading. I was just wondering about the differences in hz reading but should I get the same hz reading port and cabin if I use a test tone?

No. It'll have something to do with the way the vehicle reacts/resonates with the output of the sub/box. I'm just not qualified to make scientific statements.

I used a test tone yesterday and it read the same port and cabin.

what's the song?

When playing a tone, the meter can only read one note as that will be the peak frequency...

Now, in a song, with multiple frequencies, whichever is the loudest in the cabin, that is the peak in the car.

You will not ever see yourself playing a 40hz tone and the meter read something like 48hz... There is no 48hz material in the tone.

Now, when playing a sweep, the meter will pickup the loudest note out of the whole sweep.. same thing with a song.

sweeps for the win. that is, when you have a meter

I'm just not qualified to make scientific statements.

None of us are.

Doesn't stop us from trying

The port is most active right at the tuning freq. Almost all the output from the system will be coming form the port at that freq. Box is tuned to right around 36hz, yes?