&lt;p&gt;The BS-678 is a double-cone type speaker with a wooden cabinet that has a stylish compact and unobtrusive design and that delivers highly cost effective performance. A push-in type input connector allows easy cable connections and bridge wiring. The selectable input impedance can be easily adjusted by changing the tap position of the unit&amp;rsquo;s transformer. 6 (16cm) double cone speaker unit ensures high-quality sound making the BS-678 ideal for BGM and announcement applications. It can be installed in either a horizontal or a vertical orientation. Its structure permits direct wall installation with screws making the speaker unit resistant to falling even if outward force is applied to it.&lt;br /&gt;&lt;br /&gt;&amp;bull; Stylish compact and unobtrusive design&lt;br /&gt;&amp;bull; Quick and easy installation&lt;br /&gt;&amp;bull; High cost-effectiveness&lt;br /&gt;&amp;bull; Horizontal / vertical installation&lt;br /&gt;&amp;bull; Ideally suited for BGM and announcements&lt;/p&gt;&lt;table class=features&gt;&lt;thead&gt;&lt;tr&gt;&lt;th colspan=2&gt;Features&lt;/th&gt;&lt;/tr&gt;&lt;/thead&gt;&lt;tbody&gt;&lt;tr&gt;&lt;td class=feature&gt;Type&lt;/td&gt;&lt;td&gt;Wall  &lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td class=feature&gt;Wall mountable&lt;/td&gt;&lt;td&gt;Y  &lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td class=feature&gt;100v Line&lt;/td&gt;&lt;td&gt;Y  &lt;/td&gt;&lt;/tr&gt;&lt;/tbody&gt;&lt;/table&gt;