I try to combine my 7 band FIR filters into 1 FIR in order to process an audio signal. I use convolution to combine their coefficients but the effective is not the same as I apply 7 different FIR filter. I also have the gain problem
H = conv(conv(conv(conv(conv(conv(h1,h2),h3),h4),h5),h6),h7)
My questions are Is convolution a correct way to do combine multiple FIR filters into one filter If not, then what technique should I look into? If yes, then what did I do wrong?