During the years 1996 through 1998 the MDI and GOLF experiments on the SOHO mission have provided unique and nearly uninterrupted sequences of helioseismic observations. This paper describes the analysis carried out on power spectra from 759 days of calibrated velocity signals provided by these two experiments. The time series investigated in this work are from 25 May, 1996 to 22 June, 1998. We report the results of frequency and splitting determination of low-degree (l < 4) acoustic modes in the frequency range between 1.5 mHz and 4.0 mHz. The power spectrum estimation of the signals is performed using classical Fourier analysis and the line-profile parameters of the modes are determined by means of a maximum likelihood method. All parameters have been estimated using both symmetrical and asymmetrical line profile-fitting formula. The line asymmetry parameter of all modes with frequency higher than 2.0 mHz is systematically negative and independent from l. This result is consistent with the fact that both MDI and GOLF data sets investigated in this paper are predominantly velocity signals. A comparison of the results between symmetric fit and asymmetric one shows that there is a systematic shift in the eigenfrequencies for modes above 2.0 mHz. The results show that eigenfrequency and rotational splitting values obtained from both the MDI and GOLF signals are in excellent agreement, and no significant differences exist between the two data sets within the indetermination of the measurement.