It is useful, but to find the right products and manufacturers. Because the soundproof window is still a professional non-standard products. In addition, for sound insulation, another major problem is sound leakage, some times not enough sound insulation, but too much sound leakage points, when installing windows should be sealed tightly around.
It is recommended that the soundproof windows with a minimum of 70 profiles, glass composition with 6 + PVB + 6 + 12 cavity + 6 mode, sealing strips and linkage locks to choose some good.