The HTML for a 2nd sidebar in the CBOX Theme

sidebar-html.php

// Alt Sidebar
function cbox_alt_sidebar() { { 
    if ( !bp_is_blog_page()  ): ?>
		<aside id="sidebar-alt">  
		    <?php
		        if ( is_active_sidebar( 'alt-sidebar' ) ) {
		        dynamic_sidebar( 'alt-sidebar');
		    } else { ?>
		        <div class="widget"><h4>Alternative Sidebar.</h4>
		        <a href="<?php echo home_url( '/'  ); ?>wp-admin/widgets.php" title="Add Widgets">Add Widgets</a></div><?php
		    }
		    ?>
		</aside>  
	<?php endif; }} 
// Hook into action
add_action('open_main_wrap','cbox_alt_sidebar');