decrease bass boost to negative db Values

[hoyo]

I've an Logitech Speaker Set which always boosts the bass.
so i want to reduce the settings in the Sound Menu.
Minimum is 0db. (i think --> neutral Sound)
but i need something like -6db for this speakers to get neutral tones.

[Didgeridoohan]

You don't mention what player you have, but since most of them have an equalizer (apart from the Archos players, I think), why don't you try that out? Should be in the sound settings...

[Multiplex]

To flesh out Didgeridoohan's response a bit...

There are two ways that Rockbox has 'tone controls';
One is to drive the capabilities of the codec devices in the various players - this is where you see the Bass and Treble options in menus - obviously Rockbox and only command the chip to do whatever it can do - if it only has Bass boost then obviously 0dB will be the minimum.

The other is the equalizer that is available on most players (all of them where the decoding is done in software I think) - this is done by running DSP code on the main processor, it is very versatile, I suggest that it needs a fair understanding of audio, and it does impact battery life becaus the CPU is working harder.

[hoyo]

I've an H340@actual rockbox (current build)

yes, i know - there is an graphic equalizer.

but - why you have the feature to increase the bass/treble twice
(sound-settings Bass/Treble (simple), equalizer (complicated))

and the feature to decrease bass/treble only complicated via equalizer if it would be enough to put some negative values to the sound-settings bass/treble  menu?

edit: sorry... i've read the last post just now and an short view to the originally firmware tolds me that there are only positiv values too in the simple menu.

[Multiplex]

If you want the detail the codec used by the H300 is this device http://www.rockbox.org/twiki/pub/Main/DataSheets/Philips_UDA1380TT_Datasheet.pdf and it describes it as having Bass Boost on Page 15

Bass boost, which is selectable gain for low frequencies (positive gain only).

There's a load of detail about the hardware in the Wiki if you want to delve - I find it makes me appreciate the efforts the devs wen to to develop a port