Do either of you have a link to discussion that the Wifi Control module / app doesn't control volume from the app? I actually checked the Play Store on my Dasaita PX5 on Hal9k ROM to make sure the app was available to install (minimum Android 7), which it is - I went ahead and installed it. Clearly, without an actual DSP to connect to since I don't have either the DSP or the Wifi Control module (yet), I don't get past setup to even see if volume control is possible. A screenshot of the app directly from AF site seems to indicate that master volume control, as well as HEC control, should be possible:
Well then -i don't understand why you have a problem with SQ.
I have DASAITA HU + HELIX DSP (.3 right now; previous was P6mk2). My devices are connected with RCA and SPDIF optical.
HU is connected via pream RCA with DSP's analog in (CH.1&2); i'm also using USB AUDIO via USB-to-SPDIF converter /XMOS XU208/; i'm not using HELIX HEC USB
analog connection is used for all except music (maps, phone connection, youtube); mainly for sound sources that have low quality.
i'm using USBAudioPlayerPRO for music. I have no pops, clicks, etc.; connection is stable; sound is clean and works up to 96/24bit (limited by DSP). my device is not recognized by HU as sound card (no android sounds) yet UAPP comunicates with it
For volume controll i'm using HELIX DIRECTOR (mainly digital; analog can be controlled by stering wheel)
another 'mod' i did is to disconect speaker cables and TDA7850 chip from motherboard (no static noise/hiss)
main cons i can think of:
i've red that UAPP can catch volume control from HU; i'm using BITPERFECT mode, so no volume controll via SPDIF;
-uapp is not perfect in usability
one more info:
i've checked parameters of PREAMP out; with maxed volume (+30) and 1kHz 0dB test tone i get aprox. +2,5V and clean sin wave. that's good!
my board is DASAITA MAX6 with ADAU1401 chip.
if needed i can make a video as proof
That test of the preamps with the sine wave is pretty cool! I'm not so much having SQ problems so much as I am limiting my Alpine amp's headroom. I can clearly tell that I can get louder / cleaner on nominal amp gains - especially if I added a quality DAC in between with stronger preamp voltage. Further still, I haven't yet gotten a subwoofer into the mix - from what I've read, these PX5 units have an even weaker preamp on the mono output.
When I use my Audioquest Dragonfly in UAPP, there is a setting for Hardware Volume Control (Left / Right channel vertical sliders) in the settings that allow for volume changes historically in my usage of the app. Do you not have the same option available in Bitperfect mode? I realize that your device is keeping the signal totally digital to send to your Helix DSP, so that may not be possible.
EDIT: I also wanted to add that Android, as soon as I hotswap my Dragonfly by plugging it in, shows a little headphone icon in the status bar over next to the wifi icon. Not sure what that is about; not sure also if any of you using USB audio see this icon as well?
as I recall I use 1.1 connection - it worked better than 2.0.
head unit is PX5 dasaita, main player is UAPP (disappointed from the practical side, as it cannot index my 4tb drive) , processor is 3rd generation DSP ULTRA
I am not sure that low output volume was "feature" of Hal9k roms , unit was already upgraded to hal9k 8.0 before being connected in the car.
unit is considered old - bought in 2018.
hopefully audiostage HEC would be the solution...
Noted on the 1.1 speed - if I end up going down the Helix path, I'll be sure to try that out. Without any timetable for the Audiostage module, I am left to come up with an alternative for now.
The Wifi Control module also has a mini DIN port to allow the use of a URC.3 remote control, but I'd really rather avoid having a hardware knob somewhere in the car if I can avoid it.