Filter Filters $500 and above Avalanche Remove All Filters Condition New (4) Brand Harmony Audio (4) Make Chevy (4) Compatible with 2002-2013 Chevy Avalanche Underseat Harmony F124 Dual 12" Sub... $526.99 Compatible with 2002-2013 Chevy Avalanche Underseat Harmony A122 Dual 12"... $521.99 Compatible with 2002-2013 Chevy Avalanche Underseat Harmony F124 Dual 12"... $544.99 Compatible with 2002-2013 Chevy Avalanche Harmony F124 Dual 12" Sub Box... $514.99