Alpine D800R Only 1.4V rca output

[SaSp]

hi guys

i wanted to upgrade my headunit from a Iva-105R to the D800R (both on complete flat and subwoofer lvl15)
i installed the d800r and miss so much bass so i switched back to the Iva-105R

so i tested a bit and found some things out with both radios (both on volume28 and subwoofer lvl15 rest flat)

If i set the media xpander from the d800r on voltage changes (MX CMPM Off=1.4V lvl1=1.6V lvl2=2,1V lvl3=2.3V)

next i put the D105R in and get constant 1.8V output

im really not sure to ever install the d800R and i hope some1 can help me out

greets SaSp

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