The cost per office of the Sonet APS is significantly less than an in-ceiling sound masking system. In-ceiling systems that require professional installation by electricians are priced for an entire area treated. Sonet APS on the other hand, is only installed where needed and requires no professional installation, as a result Sonet APS saves money. Your dealer will gladly quote prices.. © Cambridge Sound Management 27 Moulton Street Cambridge, Massachusetts 02138 800 / 219-8199 617 / 349-3779 telephone 617 / 349-3788 fax info@cambridgesoundmanagement.com