PRV Audio 10MR650A 10" Midrange Loud SpeakerPRV Audios ALTO Series were carefully crafted and voiced to reproduce a natural, smooth sound while remaining dynamic. To get the superior fidelity, a special composite cone is used to smooth frequency response and to keep the moving mass low, increasing the efficiency. Meet the new improved version from 10W650A New basket design implemented, reducing its size from 4. 33 to 3. 90 of mounting depth Improvement on output throughout + 1dB on the low