Head unit Measurments for Forscan Changes and High level vs Low Level
 

Here is the data for the varying Forscan EQ Settings changes and High level vs. Low Level.

First thing I would like to note, other than the output voltage (power), The only change between low level and high level is a 3db bump in low end when high level is on.
Also note, there was no rear speaker high pass filter on any of the flat EQ's.

Some interesting results: For the ones that are identical, I just grouped them in one picture. For the ones that are different, I separated them out.
Low level eq0 was ~3.5v out at max volume, other flat eq's were about ~5.5v out at max volume.

Note: This is on a 2014 F150 Limited ACM. Factory had the sony system. I can not gurantee this is the same on the newer trucks. There are some changes in the amount of code available on the EQ line, so they may be.

This is all for these changes in the ACM:
https://cimg5.ibsrv.net/gimg/www.f15...0456f6e497.png

You do not need forscan to check your asbuilt setting.
You can check what your asbuilt is here: https://www.motorcraftservice.com/AsBuilt
You may have to select your region and then re-click this link.

Here are the high level results

EQ 0, 4, 5, 6, 7, 8, 9. A, B
Front and Rear speaker outputs measured.
EQ 0 on the Front has an even higher bump (5db instead of 3db) in the low end compared to the others. Otherwise the same. Rear does not have that bump

https://cimg7.ibsrv.net/gimg/www.f15...26c361e344.png


EQ 1 Front Purple and Rear Orange
https://cimg9.ibsrv.net/gimg/www.f15...7039f07a9b.png



EQ 2 Front Green and Rear Blue
https://cimg0.ibsrv.net/gimg/www.f15...707f2b05df.png



EQ 3 Front Brown and Rear Green
https://cimg2.ibsrv.net/gimg/www.f15...b56f899cdf.png


EQ C Front Green and Rear Blue
https://cimg3.ibsrv.net/gimg/www.f15...6a5bdbf263.png

Here are the low level outputs

EQ 0, 4, 5, 6, 7, 8, 9, A, B
Both Front and rear. (ignore the orange abnormality at the 20khz range. I forgot to re-do this because I made a simple mistake when I was doing the rears. I re-measured all but that one apparently)https://cimg1.ibsrv.net/gimg/www.f15...2cfad537a9.png


EQ 1 Front Blue and Rear Orange
https://cimg2.ibsrv.net/gimg/www.f15...d638e78853.png



EQ 2 Front Green and Rear Blue
https://cimg6.ibsrv.net/gimg/www.f15...3e2b34424b.png



EQ 3 Front Brown and Rear Green
https://cimg7.ibsrv.net/gimg/www.f15...4d2b65ad75.png


EQ C Front Green and Rear Blue
https://cimg8.ibsrv.net/gimg/www.f15...d9edf76c19.png

IF you want to compare High vs. Low


https://cimg3.ibsrv.net/gimg/www.f15...0f344a4474.png



https://cimg4.ibsrv.net/gimg/www.f15...461ab5752b.png



https://cimg5.ibsrv.net/gimg/www.f15...b64d7cd9a4.png



https://cimg7.ibsrv.net/gimg/www.f15...b77a8fb3ef.png



https://cimg8.ibsrv.net/gimg/www.f15...e57423a3e3.png



https://cimg0.ibsrv.net/gimg/www.f15...a22a2bf3c3.png



https://cimg1.ibsrv.net/gimg/www.f15...0de85d3d30.png



https://cimg6.ibsrv.net/gimg/www.f15...2ba5ac07f5.png



https://cimg8.ibsrv.net/gimg/www.f15...71747c3484.png



https://cimg0.ibsrv.net/gimg/www.f15...e9fae8cf27.png

IMPORTANT NOTICE:

These tests are from a 2014. 2015 and up have a verified 80hz high pass filter on the rear channels. This is not an assumption. This is proven and verified.

IMPORTANT NOTICE #2

Please do not use the rear channels for 2015 and up trucks or you will be back on this forum asking why your sub isn't working properly.

Yes! Thank you for those. I figured there was some other things with the 2015+ trucks as they have additional lines of code.

These charts are amazing... basically use EQ 0, and if you are using high levels inputs make sure you have your highpass filter engaged, unless your speakers can handle a 5db boost at 60hz.

I also loved your subwoofer firing charts! Those can save people a lot of time and headaches.

Both posts should be stickied.

Use EQ 0 if using low levels and need 4v out. Use one of the other flat EQ's if you need 6v out. Most dsp's though max at 4v inputs that I've found so eq 0 would be the most common. Some amps allow more than 4v in so if no dsp, you could use the extra voltage.

If high level, as long as you have one of those flat eq's, it doesn't matter. No need to change it.


Also note: The part numbers for 2013-2014 ACM's are the same as 2015-2018 f150's but the 2015+ use a different firmware version (I am making this assumption as they have more lines of code in them) so this may or may not apply for 2015+. Someone should check it out.

Here are the parts you would need:

Level attenuation device to not go over 1v into your sound card

Rca to headphone to go into your soundcard

External soundcard so you don't fry your internal one.

Rca cables to connect everything and one rca -> Speaker wire if you are using hi level

Would the +3db bump in the low end when using High Level be a reason why sublevel would sound unbalanced?

Example listening to country music (which isn't known for its bass)

Sub level is set to 11 (out of 15) on the DSP and sound feels pretty balanced and stereo can be turned up without feeling like you are pushing the sub hard

Change the song and boom at the same volume the bass feels like it overpowering (because it falls in that range) and you end up having to turn down sub level to 10 (out of 15) on the DSP.

I know with the 15+ (I have a 19) we are recommended to use the High Levels from the front. Especially since I have a 7spk XLT