The main goal of room acoustical treatment is a realistic reproduction of recorded material without negative influence of room on the resulting sound image. So in this work the acoustic parameters of small recording studio and control room are improved by using basic acoustic elements (bass traps and absorption surfaces). The impulse responses have been measured in mentioned spaces before and after acoustic treatment and also compared with modelling results obtained by using simulation program EASE for basic room acoustic calculations. The biggest problem in the recording studio was very low reverberation time due to large amount of absorption material. Part of that material was removed and the rest of it was distributed evenly in the space, thus an increase of reverberation time has been obtained at low and mid frequency range. The main problem in control room was too large reverberation time and unequalized pressure magnitude frequency characteristic especially at lower frequencies. Due to an unbalanced frequency response and excessive reverberation time in control room, several steps were applied: setting the carpet on the floor, acoustic foam on top of the first reflection points, bass traps in the front corners of the room and speaker calibration. These steps have reduced the reverberation time, balanced the frequency response of control room at mixing position and prevented the sound reflections from the walls as well as the concentration of low frequencies in the corners of the room. Also, the additional objective acoustic parameters are considered in this work, like clarity of speech and music, definition and symmetry of impulse responses on the left and right channels recorded by using artificial head at the sweet point in control room. The obtained acoustic parameters after treatment are in the range of suggested values regarding some recommendations given by Beranek, Rossing. The correlation between objective and subjective acoustic parameters before and after treatment of the space is given in the presented results.