How to get the dirty old sound?

[Trebor]

... is that so hard guys?

You're not being very specific about the "dirty old sound" effect you're looking for. If you want an old vinyl sound then the main elements are : crackle (aka surface noise), turntable rumble, warp, mains hum, and hiss.
The isotope plugin I mentioned above does all of those except hiss, you can add hiss (aka white noise) via Audacity's "Generate" menu.

[mrwiseintelligent]

well, today i spent a lot of time trying to get the sound i need.
so what can i say.
it's not that superhard, but i have just experiment with different bitcrushers, lo-fi tools, adding hiss to the track, etc.. but
the main part here is taken by EQ.. yeah, i tried to reach some sound i needed, was close, but didn't get exactly what i needed.. and how to learn this i don't know
if someone here who knows about clever EQing could tell me how should use EQ to get the sound from some of audios i posted (the very best examples are this - https://soundcloud.com/mrwiseintelligen ... p-hop-boom and this -http://www.youtube.com/watch?v=uN2INzoHuoI ) that would be really really nice
i don't know how to desribe this sound, but i'll try.
like punchy-crunchy high snares, almost the same thing with the hi-hats, and low bassey kicks... something like that?
but i'm glad that i moved from that zero point..
thanks to all who tried to help

[Trebor]

... i tried to reach some sound i needed, was close, but didn't get exactly what i needed.. and how to learn this i don't know

The effect you may be looking for is pseudostereo , the track "Dgyrick - HIP-HOP Boom" is (dual)mono : the Left and Right tracks are perfectly identical. Hiss and crackle is more prominent when in (pseudo)stereo , (boosting the frequencies above 2KHz helps emphasize the hiss & crackle too) ...

''Dgyrick - HIP-HOP Boom'' (excerpt) before-after trebleboost and pseudostereo.mp3

(207.35 KiB) Downloaded 110 times

There are plugins which perform pseudostereo, but you can do it manually.
1. create a duplicate of your dual mono track (select the dual mono track then press "ctrl" + "D" keys ).
2. split the duplicate into two tracks and add 10ms* of silence to the start of one.
3. recombine the two duplicate mono tracks into a "stereo" track.
4. Play this mix of tracks and vary the gain of each track to taste, (e.g. dual mono -8dB*, duplicate -4dB*),
you can adjust the effect (via gain controls) while the tracks are playing (which you can't do with plugin effects in Audacity).

[ * just suggestions ]

[TJJAMES]

I recently got a Wasaphone lo-fi mic off eBay. They're pretty cheap and great for getting a gritty lo-fi sound live and in the studio. http://www.wasaphone.com/