Presence gain on BDI21

[artstomp]

Hi you all folks...my bass player friend has Behringer BDI2 and asking me he needed more on the presence knob and more lower end on over all tone...please advice which resistors/capacitors should be replaced...i know Behringer BDI21 is a copy of the SANSAMP Bass Driver..so here is the schematic of the latter...thank upu guys in advance...

http://guitar-gear.ru/wp-content/uploads/2016/06/Sans_amp_scheme.jpg

[Ariosto]

Hi you all folks...my bass player friend has Behringer BDI2 and asking me he needed more on the presence knob and more lower end on over all tone...please advice which resistors/capacitors should be replaced...i know Behringer BDI21 is a copy of the SANSAMP Bass Driver..so here is the schematic of the latter...thank upu guys in advance...

http://guitar-gear.ru/wp-content/uploads/2016/06/Sans_amp_scheme.jpg


Maybe it can help. I did it to 2 units of my own and they sound much better now:

https://www.youtube.com/watch?v=l8MbcoSsc14