More on Amazon.com : http://www.amazon.com/gp/product/B002MA8D64?tag=purrfectcatdi-20 <br /> <br />Atlas Sound M10008 Dual Cone Sound Masking Speaker with 70.7V-4W Transformer and Enclosure <br /> <br />734 cubic inch enclosure for extended low frequency response <br />Black epoxy finish blends with open ceiling plans <br />Design enables upward downward and side firing sound dispersion <br />Innovative input panel includes combination knock-out and strain relief connector item is only a single speaker not a 4 pack
