sound fades away help needed?

hi guys, ive made a few tracks or loops where the bass sounds good when im in front of my tannoy reveals and i think yeh thats sweet, then when i stand up and go further away from my speakers there is no bass, the kind of bass im on about is like a sort of hollow tom noise any ideas why this is ? it really bugs me cos it sounds so so good when im near but then crap when im out of the room or even when i stand up. any info would be much apprecaited cos ive given up on so many tracks cos of this
cheers guys
ron

also anyone know of anyone selling a pg 300 for my apha juno 2 let me know except ebay cos ive been ripped off one time to many

and finally if i bought a devil fish mod from australia does anyone know of somone who can fit it in the uk so i dont have to send my 303 to australia.

cheers guys

accoustically treat your room.

the way sound waves reflect at different parts of your room will give you completely different perceptions of the bass at different positions. you want to stop this interferance by trapping the bass so it does not reflect.

bass traps across as many corners as you can. i built my own.