From what i remember about these as we had to translate the manuals for them in English, the EQ is a master EQ which processes through all output channels.
You may not know this from the way how the EQ looks in the video but the 15 Band EQ is not Graphic. It is a 15 Band Parametric EQ. This will allow to fine tune any problem areas when looking at the system as a whole.
You would do leave this flat, set your crossover network first to fine tune all passbands in the vehicle.
Once that is to your liking, you then can run sweeps on an RTA to see what areas need attention. Then, you can use the parametric EQ to go right to those areas and fix them.
The device, for those who "like it loud", can also benefit from using the Limiter built into it as well.
The Limiter varies from -20dB to 0dB(not in use) to protect excessive input voltage flowing through your amplifiers so your equipment is not clipped to hell.
Not only does it have a variable Limiter, but we allow to also change the Attack/Release time of the Limiter.
IE- once a signal comes in that surpasses the Limiter's threshold, the Release function in units of "ms" can be set to tell the unit when to engage the Limiter.
The maximum wait time is 1000ms or 1 second. I believe the lowest time is 15ms which is extremely fast.
The good thing about the Bluetooth capability is when you are fine tuning a setup and you are really into it, the last thing you need is to keep getting up out of the seat, changing settings, then getting back in the seat and try to "remember" how it sounded before if not using an RTA.
BT not only keeps you focused on tuning but greatly speeds up the process.
PS- Even though this is still under $400 with the Bluetooth addon, SounDrive is a dealer of ours on here you can contact and ask about pricing.
It's called- JFA DX5 with BT DX add-on.
If you do decide to purchase one of these, do not forget all settings can be saved into 3 different presets.
We HIGHLY urge people to also write down all of their settings!
The Operating System ran in this device is Android. If the Android OS glitches, it can render certain features unusable which requires a hard reset= lose presets..
So, as a word of caution, use presets so you wont lose your settings and write them down in case you ever need to hard reset the device from a crash.