Forscan EQ

[Jon 5.0 2015GT]

Hi, I looked at the spread sheet and seen a couple of codes I’d like to change but they have a ? Mark instead of the number it can be. Do I just guess or randomly choose a number fro 0-9. Thanks.

Sponsored

 

[Cashley]

what is the purpose of shutting off the EQ in Forscan?

 

[Bassackwards]

what is the purpose of shutting off the EQ in Forscan?

it gives you a flat signal to work with.

 

[Cashley]

it gives you a flat signal to work with.

Ah ok

 

[TonyT930]

Ah ok

And I think it gets rid of bass roll off

 

[17oxford350]

it gives you a flat signal to work with.

What exactly does this mean . Completely new to everything. 9 speaker gt350 . Have sub installed. I want to run my idata link harness to Alpine PDX v9 to power focal door speakers. Is this what I need to do and get a flat signal?

 

[Cathul]

In the amplified stock system the signal usually is already flat from the ACM to begin with.
All EQ happens in the amplifier of the stock system, not the ACM.
So measure the ACMs response first and then reprogram the EQ setting with ForScan if necessary.
And even with flat EQ in ForScan in the Mustangs the ACM exhibits a non-defeatable bass boost in the lower volume settings, that you cannot get rid of with ForScan reprogramming.
It just doesn't show up in all the measurements in the internet, made with ACMs programmed for Sony sound systems that have a fixed volume line output, which equals to volume setting 30 in the ACM.
In the Sony systems the volume regulation is also done in the stock amplifiers (volume information is always sent via CAN bus upwards to and including SYNC3), so it doesn't really matter there, unlike in the Shaker and 9-speaker systems in the Mustang.

This is the reason why sometimes people write that they "lose" bass when they turn up the system. It's just unavoidable with the Mustangs. At volume level 4 on the volume dial there is a bass boost of almost 6-8dB at 60Hz compared to volume level 15.

 

[Adam the Lighting Guy]

when i made the suggested changes in forscan to disable the eq, the door chimes and chirps became insanely loud. had to switch it back.

Same here. : /

 

[K4fxd]

Same here. : /

Enable police mode.

 

[Brigadir]

In the amplified stock system the signal usually is already flat from the ACM to begin with.
All EQ happens in the amplifier of the stock system, not the ACM.
So measure the ACMs response first and then reprogram the EQ setting with ForScan if necessary.
And even with flat EQ in ForScan in the Mustangs the ACM exhibits a non-defeatable bass boost in the lower volume settings, that you cannot get rid of with ForScan reprogramming.
It just doesn't show up in all the measurements in the internet, made with ACMs programmed for Sony sound systems that have a fixed volume line output, which equals to volume setting 30 in the ACM.
In the Sony systems the volume regulation is also done in the stock amplifiers (volume information is always sent via CAN bus upwards to and including SYNC3), so it doesn't really matter there, unlike in the Shaker and 9-speaker systems in the Mustang.

This is the reason why sometimes people write that they "lose" bass when they turn up the system. It's just unavoidable with the Mustangs. At volume level 4 on the volume dial there is a bass boost of almost 6-8dB at 60Hz compared to volume level 15.

Thanks for the valuable info! Interesting, in my case with 9 speakers & factory amp I switched to aftermarket amp and this change in Forscan has improved the sound, made it clearer:
APIM 7D0-01-01 *xxx -> 0=DSP Disabled

and regarding the bass I’ve found this tip:
ACM 727-01-02 x0xx: change 0 to 4, 5, 6, 7, 8, 9 for flat EQ, 0 means bass boost
But it didn’t have hearable effect.

 

[Cathul]

The 721 lines do not remove the bass boost.
Mine was at 0 from factory and it still has the bass boost. Changed to 4, 6 and still bass boost.

 

[Bassackwards]

In the amplified stock system the signal usually is already flat from the ACM to begin with.
All EQ happens in the amplifier of the stock system, not the ACM.
So measure the ACMs response first and then reprogram the EQ setting with ForScan if necessary.
And even with flat EQ in ForScan in the Mustangs the ACM exhibits a non-defeatable bass boost in the lower volume settings, that you cannot get rid of with ForScan reprogramming.
It just doesn't show up in all the measurements in the internet, made with ACMs programmed for Sony sound systems that have a fixed volume line output, which equals to volume setting 30 in the ACM.
In the Sony systems the volume regulation is also done in the stock amplifiers (volume information is always sent via CAN bus upwards to and including SYNC3), so it doesn't really matter there, unlike in the Shaker and 9-speaker systems in the Mustang.

This is the reason why sometimes people write that they "lose" bass when they turn up the system. It's just unavoidable with the Mustangs. At volume level 4 on the volume dial there is a bass boost of almost 6-8dB at 60Hz compared to volume level 15.

This was not my experience. I toyed with several eq settings in Forscan and there are differences, even with my factory amp disconnected.

 

[Cathul]

I have removed the amp completely, still having bass boost with every EQ setting that should give a flat response.
Well, the response is flat, when the volume dial is set to a number larger than 15... below that i have a variable bass boost depending on the volume setting.
That's one of the main reasons to have a direct connection from my phone to my Mosconi DSP.
Still able to alter the volume through CAN bus, but best possible sound quality this way...

 

[S550HPP]

I just put a remote bass control knob by USB to left front of shifter.

Invaluable to dial the bass on the fly according to mood, genera, recording spec, and speed etc.

Usually it's dialed between 45 and 65% some times go higher just to have fun w sub with some hard hitting punchy bass powered by Kenwood XR1000 plugged into AP8.9 that equalized signal on first set -up after I did the forscan.

 

[TreeFiddyAre]

Here you go...

This has been discussed many times. To disable factory EQ you only change the first two hex numbers to zero. Leave all other digits alone. If you changed other bits, you should set them to what they used to be. Hopefully you wrote down the original settings.
727-01-02 - 00xx "Disables Factory EQ Processing" (don't mess with xx or change anything else)

Here is a spread sheet...

If this Forscan tweak — “Stereo - Flat Line Out (enables flat/low output so you can hook up amps or disconnect subs)
ACM 727-01-01 xx5A xxxx xxxx
727-01-02 00xx” — really works as described, does it basically give all the speakers equal power so the rears stop doing that awkward “roll-over-and-die” thing? And what about the sub? Does everything end up getting a full-range signal or does it allow all channels to get equal power?


I’m asking because I’m getting close to doing a full system in my ’19 350R. I’d like to start by adding a rear component set — and if the factory amp can push it — I might even ditch those speakers and drop in a 6.5" mid-bass I have. But if the rest of the channels are suddenly going to be fed frequencies they were never meant to see (like asking your tweeters to hit leg day), then I’ll just wait until I install the full setup.


I can’t shake the feeling that if the OEM DSP wasn’t strangling half the channels, and I threw in a solid 3-way front stage with a 2-way in the rear — or maybe a sensitive mid-bass on the rear deck paired with the OEM-box and DD audio sub I am running — it might actually be… acceptable.
Not great. Not amazing. Just “yeah, I can live with this” acceptable.

Sponsored