This hack is for the JVC RV-NB1 Kaboom and similar models with BH3852S audio IC.
This hack will give you Full Control of Bass and Treble. Enable the HIDDEN Surround feature. Force ACS on all the time. Your Kaboom will finally have treble with balls!
The BH3852S is a signal processing IC for volume and tone control. Its driven directly by the micro-controller. There are separate current driven control lines for bass and treble along with a surround mode feature.
Normally, the micro-controller handles the BH3852S with respect to the EQ profiles.
The highest treble setting in the EQ profile is well below what the chip can do.
The treble/bass boost capability is significantly higher with this hack.
The hack essentially overrides the control lines coming from the micro-controller and offers the user full control of bass and treble, switchable surround and ASC force mode.
The BHH3852S has a surround feature that is normally disabled on the Kaboom.
Grounding pin 11 turns it ON.
Also, the ACS (Active Clear Sound) normally comes on and off to augment the highs.
Forward biasing the base of Q8353 will force ACS on all the time.
Enjoy!
Brett
This hack will give you Full Control of Bass and Treble. Enable the HIDDEN Surround feature. Force ACS on all the time. Your Kaboom will finally have treble with balls!
The BH3852S is a signal processing IC for volume and tone control. Its driven directly by the micro-controller. There are separate current driven control lines for bass and treble along with a surround mode feature.
Normally, the micro-controller handles the BH3852S with respect to the EQ profiles.
The highest treble setting in the EQ profile is well below what the chip can do.
The treble/bass boost capability is significantly higher with this hack.
The hack essentially overrides the control lines coming from the micro-controller and offers the user full control of bass and treble, switchable surround and ASC force mode.
The BHH3852S has a surround feature that is normally disabled on the Kaboom.
Grounding pin 11 turns it ON.
Also, the ACS (Active Clear Sound) normally comes on and off to augment the highs.
Forward biasing the base of Q8353 will force ACS on all the time.
Enjoy!
Brett
Just need a new CD player. And there's three flashed-over accessory holes not used (optical, mix. mic, & mix. level) Would Q8353 take being constantly forward-biased? Maybe skip the switch & leave it on all the time when the Kaboom's on? You could then put the other switch and the pots on the back. 
I second the motion. This is very cool. 
