18" Filter Sort × Filters In Stock Availability In Stock Price $100-$500 (4) $500 and above (10) Condition New (12) Refurbished (2) RMS Power 1000-2000 (9) Peak Power 3000-5000 (9) Size 18" (8) Voice Coils Dual 1 Ohm (4) Mounting Depth Over 10" (8) Sensitivity 88.4dB (4) × Sort Options SKU: A-ZSKU: Z-A Price: Low to HighPrice: High to Low Least PopularMost Popular Sort by: SKU Sale Price Popularity Harmony Audio HA-ML181 Monolith 18" Competition Sub 3500W Dual... $379.95$664.99 Harmony Audio HA-ML182 Monolith 18" Competition Sub 3500W Dual... $379.95$664.99 (2) 2x Harmony HA-ML181 Monolith 18" Competition SPL Sub 3500W Dua... $744.95$1,304.99 2x Harmony HA-ML182 Monolith 18" Competition SPL Sub 3500W Dua... $744.95$1,304.99 Harmony Audio HA-ML181 Competition SPL 18" Sub Subwoofer Bundl... $574.95$1,009.99 Harmony HA-ML1X18D2 18" Dual 2-OHM Subwoofer Vented Enclosure ... $529.95$929.99 4x Harmony HA-ML181 Monolith 18" Competition SPL Sub 3500W Dua... $1,434.95$2,514.99 Harmony Audio HA-ML181 Monolith 18" Competition Sub 3500W Dual... $379.95$664.99 Harmony Audio HA-ML182 Monolith 18" Competition Sub 3500W Dual... $379.95$664.99 4x Harmony HA-ML182 Monolith 18" Competition SPL Sub 3500W Dua... $1,434.95$2,514.99 2x Harmony Audio HA-ML181 Competition SPL 18" Sub Subwoofer & ... $1,079.95$1,889.99 2x Harmony Audio HA-ML182 Competition SPL 18" Sub Subwoofer & ... $1,029.95$1,804.99 Harmony Audio HA-ML181 Competition SPL 18" Sub Subwoofer Bundl... $589.95$1,034.99 Harmony Audio HA-ML182 Competition SPL 18" Sub Subwoofer & CXA... $669.95$1,174.99
