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I just got my Grom Usb Audio installed with the optional BT dongle for wireless music streaming. The USB audio sounds very close to CD quality since it uses your car's factory DAC. The direct wired AUX input sounded a little wash out compare to the direct USB input since its using your phone/mp3 players DAC which are not really optimize for car speakers. Bluetooth sounded the worst out of those 3 options. If you want convenient of no wires then the sound is ok for casual listening.
Here is my rating out for the 3 options, 10 being cd quality
Direct USB input = 10
Aux = 8 (Bass is washed out when I use this option but the voals are good)
Bluetooth Stream = 6.5 (Vocals and Bass are washed out at high volume)
My setup is the factory Carver hi-fi DSP no nav.
I am assuming the Soundplicity/dice unit bluetooth should be similar to the grom in sound quality wise. If you are getting it for just bluetooth streaming u may get disappointed in the sound quality if you are used to cd quality music.
Just my 2cent
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