Quackfoo
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- 2016 Black GT Premium
Don't know if this helps, this is an unmodified acm from a 9 speaker shaker (no amp)
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Alright. I did some searching, found two otherwise identically configured cars - EcoBoost Premium Perf Pack Automatics without Nav or Rear Park Assist. Only difference is color of paint and one is a fastback, the other a vert. Grabbed their window stickers to verify, and downloaded their as-built and loaded them into As-Built Compare. This is how you figure this stuff out if you want to do it on your own.Well, made the changes and no dice. Bass still falls off a cliff when you unlatch the top. Went back in and verified that the change took and the value is still 00 for 727-01-02 in the first two positions. It was 727-01-02 0700 38. I changed it to 727-01-02 0000 38.
I was using the F-150 spreadsheet, is there a Mustang specific one? Any other ideas?
- 727-01-02 xXxx xx - 7 for vert, 2 for coupe. This is the EQ profile, I believe you already changed this to 0 for no EQ.
I don't believe there's a way to do this. Try turning it off, you might like it better. You might also be better served by getting some nicer speakers for the front - part of the EQing Ford does is to attempt to make up for deficiencies in the factory equipment.[MENTION=25607]Spart[/MENTION] will this deprogram the EQ for the rear speakers only?
I want to keep the EQ intact for the door speakers.
Honestly, what you need to be doing is getting one of those small 4ch digital amps and going with variable line level output on the ACM.I am an ex-professional loudspeaker designer. You might think that I would tear out everything and put in an expensive system. But no, I just want something "good enough". The rear shelf speakers are atrocious, so replacing them is going after the low hanging fruit, IMO.
I already replaced them with some quality 7" woofers I had in inventory. But they play very quiet, and as we know, there is no bass. These woofers could handle full-range signal without damage for normal playback loudness.
So yes, I know about EQ as a convenient way to overcome speaker units' deficiencies. But the door speakers are "good enough" for now, and so I just want to stick with improving the rear speakers.
I suppose I will just have to tap into the amp inputs, and then measure the Voltage Transfer Function to see if the fronts are flat, and what shape is the signal going to the rears.
I think you misinterpreted what I was saying, if you were going with an aftermarket amp of course you'd want to try and get rid of all DSP from the ACM.Thanks, but honestly, I just want a flat signal sent to the rear. Hence why I started this thread.
If the signal from the ACM is not flat, then "un-EQ-ing the EQ" (via new digital amp) is not really the proper way to go about it.
Ideally, if I could first get the signal flat, then I can stay with the factory amp, and possibly insert a miniDSP filter between it and the ACM at some future time.
To answer your specific question, I can (and have) measure near-field of a woofer (e.g. mic right up to the backside of a woofer cone from within the trunk).So sorry for going somewhat off track here but it does concern the EQ. My question is concerning the base 6 speaker system but I am also interested in the upgraded systems.
Has any one actually done any measurements on our systems to see what the roll off is as different frequencies or volumes? I remember OEM's video demonstrating with a o-scope that the clipping or loss of a good sign wave until approx. 2/3 volume. I don't know what his ref frequency was...