No bass on the back panel

Hi everyone i have experince this for a year ago but it doesnt matter to me until now my front panel audio jack was broken.My mom broke it,so i need to use the back panel no matter what.

Now let me explain,im using a headphone btw.So far im using the front panel jack "green" it has great bass great treble great vocal, but my mom was broke it so i cant use it.So my main problem is"there is NO BASS on the back panel but there is BASS on the front panel.

My mobo is asus P5Q pro turbo it has on board audio VIA HIGH DEFINITION AUDIO.My audio driver is up-to-date.My headphone is sony MDR-V150.I often listen to trance music so it easier to catch the difference.

So please help me,reply,anything it will greatly appreciated!!

Are you using the GREEN speaker jack on the rear? It has the same audio out as the front headphone jack.

Yes im using the back panel jack "green" one.I did try using the yellow,blue,black,grey, and red jack it didnt work for me.The only jack it work for speaker/headphone is green but still no bass on it.

Suggestion 1 - uninstall the sound in the Device Manager (do not uninstall the drivers) then restart the PC. When windows starts it will detect and reinstall it. Then try the speaker jack.

Suggestion 2 - if #1 did not work, reinstall the sound driver (or if ASUS has a later driver download and use that) and then try the reart jack.

Suggestion 3 - disconnect the front panel audio cable at the motherboard. That will only leave the rear jack and see if that makes a difference.

Fireberd i did all you told me and it still has no bass on it.I tried the same song and the same headphone and play it on my iphone and the bass was great.But i play it with the same song and headphone on my desktop pc and the bass was dull.

I can't think of anything else, software wise, to suggest you try. It may be the chip has a hardware problem and if that's the case you will have to install a separate sound card.

I start to think that on the back panel is design with speaker 2.1 channel with subwoofer or higher,but not design with headphone.But in the front it has somekind of bass booster and design to use with headphone/headset."I know this problem since i buy the sennheiser HD280 headphones i has really great bass on the front panel but really freakin dull bass/no bass at all.With $100 headphone it doesnt make sense with no bass as i told it earlier.

*Edit
I know this problem since i buy the sennheiser HD280 headphones i has really great bass on the front panel but really freakin dull bass/no bass at all at the back panel