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Massive Audio GT6KP

600W Peak (150W RMS) 6.5" GT Series 2 Way Component Pro Audio 4-ohm Speakers

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600W Peak (150W RMS) 6.5" GT Series 2 Way Component Pro Audio 4-ohm Speakers

• 300 watts Peak Each, 75 watts RMS Each
• 1" Aluminum Bullet tweeters
• Treated Paper cone material
• Impedance: 4 ohm
• Sensitivity: 98 dB

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List price $179.99
-17% $149.99 /set

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Only 2 Left!

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Rockford Fosgate Power T1 T1650-S

320W Peak (160W RMS) 6.5" Power Series 2 Way Component 4-ohm Speaker System

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320W Peak (160W RMS) 6.5" Power Series 2 Way Component 4-ohm Speaker System

• 160 watts Peak Each, 80 watts RMS Each
• 1" Treated Fabric Dome Tweeters
• Carbon Fiber Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 88 dB

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1
$379.99

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Used from: $322.99
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Pioneer TS-A1671F

640W Peak (140W RMS) 6.5” A-Series 3-way 4-ohm Coaxial Car Speakers

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640W Peak (140W RMS) 6.5” A-Series 3-way 4-ohm Coaxial Car Speakers

• 320 watts Peak Each, 70 watts RMS Each
• 3/8" PET Hard Dome tweeters
• Carbon and Mica Reinforced Injection Molded Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 91 dB

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3
List price $110.00
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-43% $62.99 /pair

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Crunch CS65C

600W Peak (120W RMS) 6.5" CS Series 2-Way 4-ohm Component Speaker System

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600W Peak (120W RMS) 6.5" CS Series 2-Way 4-ohm Component Speaker System

• 300 watts Peak Each, 60 watts RMS Each
• 1" Neo-Mylar Soft Dome tweeters
• Alpha-Cellulose cone material
• Impedance: 4 ohm
• Sensitivity: 90 dB

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28
List price $49.99
-30% $34.99 /set

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DS18 PRO-FR6NEO (Sold Individually)

450W Peak (225W RMS) 6.5” PRO-FR Series 4-ohm Full-Range Bullet Loudspeaker

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450W Peak (225W RMS) 6.5” PRO-FR Series 4-ohm Full-Range Bullet Loudspeaker

• 450 watts Peak Each, 225 watts RMS Each
• Aluminum Bullet Tweeters
• Non-Pressed Paper cone material
• Impedance: 4 ohm
• Sensitivity: 96 dB

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$143.95

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Infinity REF607FSL (INFSPKRF607FSLUS)

330W Peak (110W RMS) 6.5" Reference Series 2-Way EZFit Coaxial 3-ohm Shallow Speakers

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330W Peak (110W RMS) 6.5" Reference Series 2-Way EZFit Coaxial 3-ohm Shallow Speakers

• 165 watts Peak Each, 55 watts RMS Each
• 1" Textile Edge Driven Dome Tweeters
• Polypropylene cone material
• Impedance: 3 ohm
• Sensitivity: 93 dB

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10
List price $139.95
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-37% $87.95 /pair

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JBL Club 34F (JBLSPKCB34F)

150W Peak (50W RMS) 3.5" Club Series 2 Way Coaxial 3-ohm Speakers

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150W Peak (50W RMS) 3.5" Club Series 2 Way Coaxial 3-ohm Speakers

• 75 watts Peak Each, 25 watts RMS Each
• Silk Edge Driven Dome tweeters
• UV-Resistant Polypropylene cone material
• Impedance: 3 ohm
• Sensitivity: 89 dB

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4
List price $109.95
-27% $79.95 /pair

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Kicker KSS365 (51KSS365)

500W Peak (250W RMS) 6.5" KS Series 3-Way 4-ohm Component Speaker System

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500W Peak (250W RMS) 6.5" KS Series 3-Way 4-ohm Component Speaker System

• 250 watts Peak Each, 125 watts RMS Each
• 1" Silk Dome Tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 90 dB
• Fits GM, Ford, Chrysler, Jeep, Dodge and select imports

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List price $379.99
-8% $349.99 /set

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Rockford Fosgate Punch P3 P3V2-25

300W Peak (150W RMS) 2.5" Punch P3 Series 4-ohm Midrange Car Speakers

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300W Peak (150W RMS) 2.5" Punch P3 Series 4-ohm Midrange Car Speakers

• 150 watts Peak Each, 75 watts RMS Each
• 20-40% Mica reinforced Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 82 dB

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List price $299.99
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-25% $224.99 /pair

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Pioneer TS-A653FH

680W Peak (150W RMS) 6.5" A Series 2-way 4-ohm Coaxial Car Speakers

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680W Peak (150W RMS) 6.5" A Series 2-way 4-ohm Coaxial Car Speakers

• 340 watts Peak Each, 75 watts RMS Each
• 13/16 PEI (Polyetherimide) Hard Dome tweeters
• Aramid fiber reinforced Injection Molded Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 91 dB

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1
List price $120.00
-17% $99.99 /pair

In stock

MB Quart FKB116

240W Peak (120W RMS) 6.5" Formula Series 2-Way 4-ohm Coaxial Car Speakers

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240W Peak (120W RMS) 6.5" Formula Series 2-Way 4-ohm Coaxial Car Speakers

• 120 watts Peak Each, 60 watts RMS Each
• 1" Aluminum Dome tweeters
• Lightweight Thermoformed Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 88 dB

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12
List price $79.99
-56% $34.99 /pair

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Deaf Bonce Apocalypse AP-M67AN

1200W Peak (600W RMS) 6.5" Apocalypse Series Midrange 4-ohm Car Speakers

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1200W Peak (600W RMS) 6.5" Apocalypse Series Midrange 4-ohm Car Speakers

• 600 watts Peak Each, 300 watts RMS Each
• Pressed Paper cone material
• Impedance: 4 ohm
• Sensitivity: 102 dB

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2
$449.90 /pair

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NVX XQS3 v2 (XQS3v2)

200W Peak (100W RMS) 3.5" X-Series v2 NEO Midrange Car Speakers

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200W Peak (100W RMS) 3.5" X-Series v2 NEO Midrange Car Speakers

• 100 watts Peak Each, 50 watts RMS Each
• tweeters
• Carbon Fiber cone material
• Impedance: 4 ohm
• Sensitivity: 85 dB

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7
List price $155.99
-17% $129.99 /pair

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List price $155.99
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Used from: $90.99

Kicker KSC270 (51KSC2704)

200W Peak (100W RMS) 2.75" KS Series Midrange 4-ohm Speakers with Custom Brackets for GM, Chrysler, Subaru, Toyota and Jeep Models

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200W Peak (100W RMS) 2.75" KS Series Midrange 4-ohm Speakers with Custom Brackets for GM, Chrysler, Subaru, Toyota and Jeep Models

• 100 watts Peak Each, 50 watts RMS Each
• Composite Paper cone material
• Impedance: 4 ohm
• Sensitivity: 85 dB

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5
List price $69.99
-14% $59.99 /pair

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JBL Stage3 607C (STAGE3607CAM)

300W Peak (100W RMS) 6.5" Stage3 Series 2-way Component 3-ohm Speakers

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300W Peak (100W RMS) 6.5" Stage3 Series 2-way Component 3-ohm Speakers

• 150 watts Peak Each, 50 watts RMS Each
• 1" PEI (Polyetherimide) Edge Driven Dome tweeters
• Polypropylene cone material
• Impedance: 3 ohm
• Sensitivity: 92 dB

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List price $179.95
-28% $129.95 /set

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Rockford Fosgate Punch P2 P2V2-65

300W Peak (150W RMS) 6.5" Punch P2 Series 2-Way 4-ohm Convertible Component Car Speakers

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300W Peak (150W RMS) 6.5" Punch P2 Series 2-Way 4-ohm Convertible Component Car Speakers

• 150 watts Peak Each, 75 watts RMS Each
• 3/4" Tetolon Inverted Dome Tweeters
• 20-40% Mica reinforced Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 88 dB

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2
List price $503.99
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-25% $379.99 /set

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Alpine BRV-S65 (Like New (Open Box))

300W Peak (100W RMS) 6.5" BassRev Series 4-ohm 2-Way Coaxial Speaker Set

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300W Peak (100W RMS) 6.5" BassRev Series 4-ohm 2-Way Coaxial Speaker Set

• 150 watts Peak Each, 50 watts RMS Each
• 1" Polyester cloth Dome Tweeters
• Polypropylene-Mica cone material
• BassRev tuning via Alpine OPTIM8
• Impedance: 4 ohm
• Sensitivity: 84 dB

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List price $360.00
-37% $227.95 /pair
$205.15 with coupon | Price details

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• 150 watts Peak Each, 50 watts RMS Each
• 1" Polyester cloth Dome Tweeters
• Polypropylene-Mica cone material
• BassRev tuning via Alpine OPTIM8
• Impedance: 4 ohm
• Sensitivity: 84 dB

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Kicker CSS65 (46CSS654)

600W Peak (200W RMS) 6.5" CS Series 2 Way Component 4-ohm Speaker System

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600W Peak (200W RMS) 6.5" CS Series 2 Way Component 4-ohm Speaker System

• 300 watts Max Each, 100 watts RMS Each
• 3/4" Titanium Dome tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 90 dB
• Mounting Depth: 9/16"

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34
List price $199.99
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-28% $143.96 /set

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Deaf Bonce Apocalypse AP-M60SQL

600W Peak (300W RMS) 6.5” Apocalypse Series 4-ohm Midrange Car Speakers

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600W Peak (300W RMS) 6.5” Apocalypse Series 4-ohm Midrange Car Speakers

• 300 watts Peak Each, 150 watts RMS Each
• Pressed Paper cone material
• Impedance: 4 ohm
• Sensitivity: 97.5 dB

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$119.90 /pair

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Cerwin-Vega V6525C

720W Peak (240W RMS) 6.5" Vega Series 3 Way 4-ohm Component Speaker System

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720W Peak (240W RMS) 6.5" Vega Series 3 Way 4-ohm Component Speaker System

• 360 watts Peak Each, 120 watts RMS Each
• 1" Silk Balanced Dome tweeters
• Carbon Fiber Polypropylene cone material
• Impedance: 4 ohm

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List price $467.99
-21% $369.99 /set

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Alpine S2-S65C

480W Peak (160W RMS) 6.5" S-Series Hi-Res 2-Way Component Car Speakers

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480W Peak (160W RMS) 6.5" S-Series Hi-Res 2-Way Component Car Speakers

• 240 watts Peak Each, 80 watts RMS Each
• Hi-Res Audio Certified
• 1" Cloth Dome tweeters
• Polypropylene, Glass Fiber and Mica cone material
• Impedance: 4 ohm
• Sensitivity: 88 dB

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List price $220.00
-18% $179.95 /set

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Polk Audio MM652 (MM 652)

600W Peak (200W RMS) 6.5" Mobile Monitor Series 2 Way Coaxial 4-ohm Car, Marine and Powersports Speakers

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600W Peak (200W RMS) 6.5" Mobile Monitor Series 2 Way Coaxial 4-ohm Car, Marine and Powersports Speakers

• 300 watts Peak Each, 100 watts RMS Each
• IP56 marine certified, with weep holes for proper drainage
• 1" Terylene Dome pivoting tweeters
• Titanium Coated Composite cone material
• Impedance: 4 ohm
• Sensitivity: 93 dB

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62
List price $249.00
-28% $179.00 /pair

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Cerwin-Vega V652

720W Peak (240W RMS) 6.5" Vega Series 2025 Edition 2-Way Coaxial 2-ohm Speakers

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720W Peak (240W RMS) 6.5" Vega Series 2025 Edition 2-Way Coaxial 2-ohm Speakers

• 360 watts Peak Each, 120 watts RMS Each
• 3/4" Silk Balanced Dome Tweeters
• Carbon Fiber Polypropylene cone material
• Impedance: 2 ohm
• Sensitivity: 88 dB

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$149.99 /pair

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JVC CS-DR621

600W Peak (100W RMS) 6.5" DRVN DR Series 2-Way 4-ohm Shallow-Mount Coaxial Car Speakers

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600W Peak (100W RMS) 6.5" DRVN DR Series 2-Way 4-ohm Shallow-Mount Coaxial Car Speakers

• 300 watts Peak Each, 50 watts RMS Each
• 1" Polyetherimide Balanced Dome tweeters
• Carbon Mica cone material
• Impedance: 4 ohm
• Sensitivity: 89 dB

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List price $119.00
-17% $99.00 /pair

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Pioneer TS-A1681F

700W Peak (160W RMS) 6.5" A-Series 4-Way Coaxial 4-ohm Speakers

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700W Peak (160W RMS) 6.5" A-Series 4-Way Coaxial 4-ohm Speakers

• 350 watts Peak Each, 80 watts RMS Each
• 7/16" PET Dome Tweeters
• Carbon and Mica Reinforced Injection Molded Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 91 dB

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List price $130.00
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Hertz MPK165.3

440W Peak (220W RMS) 6.5" Mille PRO Series 2-Way 4 Ohm Component Speaker System

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440W Peak (220W RMS) 6.5" Mille PRO Series 2-Way 4 Ohm Component Speaker System

• 220 watts Peak Each, 110 watts RMS Each
• 1" Tetolon Soft Dome tweeters
• Pressed Pulp Fiber cone material
• Impedance: 4 ohm
• Sensitivity: 92 dB

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List price $705.00
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JBL STAGE2 65

120W Peak (60W RMS) 6.5" Stage 2 Gen 2 Series 2 Way Coaxial Speakers

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120W Peak (60W RMS) 6.5" Stage 2 Gen 2 Series 2 Way Coaxial Speakers

• 60 watts Peak Each, 30 watts RMS Each
• PEI (Polyetherimide) Edge Driven Dome tweeters
• Polypropylene cone material
• Sensitivity: 87 dB

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List price $64.95
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Kicker KSS65 (51KSS6504) (Like New (Open Box))

500W Peak (250W RMS) 6.5" KS Series 2-Way 4-ohm Component Speaker System

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500W Peak (250W RMS) 6.5" KS Series 2-Way 4-ohm Component Speaker System

• 250 watts Peak Each, 125 watts RMS Each
• 1" Silk Dome tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 90 dB

10% Off Open Box!
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found car based on your search
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List price $279.99
-24% $212.49 /set
$191.24 with coupon | Price details

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Cerwin Vega CVMPCL6.5 (Sold Individually)

200W Peak (100W RMS) 6.5" Stroker Pro Series Full Range 4-ohm Speakers

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200W Peak (100W RMS) 6.5" Stroker Pro Series Full Range 4-ohm Speakers

• 200 watts Peak Each, 100 watts RMS Each
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 93.2 dB

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List price $119.99
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Alpine R2-S65C

600W Peak (200W RMS) 6.5" Next Generation R-Series 2-way 4-ohm Hi-Res Component Speaker System

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600W Peak (200W RMS) 6.5" Next Generation R-Series 2-way 4-ohm Hi-Res Component Speaker System

• 300 watts Peak Each, 100 watts RMS Each
• Hi-Res Audio certified
• 1" Magnesium Hard Dome swivel-mount tweeters with threaded removable housing
• Reinforced Glass Fiber cone material
• Impedance: 4 ohm
• Sensitivity: 88 dB

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List price $480.00
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Alpine DM-65-G

400W Peak (100W RMS) 6.5" DM Series 2-Way Coaxial 4-ohm Car Speakers

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400W Peak (100W RMS) 6.5" DM Series 2-Way Coaxial 4-ohm Car Speakers

• 200 watts Peak Each, 50 watts RMS Each
• 0.8" Teteron Dome Tweeters
• Injection Molded Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 92 dB

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List price $110.00
-18% $89.95 /pair

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DS18 PRO-GM6.4PK

960W Peak (280W RMS) 6.5” PRO-GM Series 4-ohm Component Midrange Car Speakers

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960W Peak (280W RMS) 6.5” PRO-GM Series 4-ohm Component Midrange Car Speakers

• 480 watts Peak Each, 140 watts RMS Each
• 1" Aluminum Super Bullet tweeters
• Paper cone material
• Impedance: 4 ohm
• Sensitivity: 92 dB

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$103.95 /pair

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Hifonics ZS65CXS

600W Peak (100W RMS) 6.5" Zeus Series 2-way 4-ohm Coaxial Car Speakers

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600W Peak (100W RMS) 6.5" Zeus Series 2-way 4-ohm Coaxial Car Speakers

• 300 watts Peak Each, 50 watts RMS Each
• 1" Neo-Mylar Soft Dome tweeters on Kapton former
• Alpha-Cellulose cone material
• Impedance: 4 ohm
• Sensitivity: 88 dB

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List price $34.99
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JBL STAGE3 GEN2 68 (STAGE368)

1120W Peak (140W RMS) 6.5" Stage3 Gen2 Series 2-Way Coaxial 4-ohm Car Speakers with Grilles

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1120W Peak (140W RMS) 6.5" Stage3 Gen2 Series 2-Way Coaxial 4-ohm Car Speakers with Grilles

• 560 watts Peak Each, 70 watts RMS Each
• PEI (Polyetherimide) Balanced Dome Tweeters
• Plus One Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 91 dB

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List price $119.95
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Hertz CK 165 + FREE $100 Gift Card

6.5" Cento Series 2-Way Component Speaker system

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6.5" Cento Series 2-Way Component Speaker system

• 142 Watts Max Each, 45 Watts RMS Each
•Semi Pressed Paper-Mica cone material
• Tetolon Tweeter dome
• 4 Ohm Impedance
• Sensitivity: 93 dB
• Mounting Depth: 2"

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• 142 Watts Max Each, 45 Watts RMS Each
•Semi Pressed Paper-Mica cone material
• Tetolon Tweeter dome
• 4 Ohm Impedance
• Sensitivity: 93 dB
• Mounting Depth: 2"

Hertz CK 165L + FREE $100 Gift Card

6.5" Cento Series 2-Way Component Speaker system

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6.5" Cento Series 2-Way Component Speaker system

• 150 Watts Max Each, 50 Watts RMS Each
•Non Pressed Paper cone material
• Tetolon Tweeter dome
• 4 Ohm Impedance
• Sensitivity: 92 dB

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• 150 Watts Max Each, 50 Watts RMS Each
•Non Pressed Paper cone material
• Tetolon Tweeter dome
• 4 Ohm Impedance
• Sensitivity: 92 dB

Cerwin-Vega H652

540W Peak (180W RMS) 6.5" HED Series 2 Way Coaxial 4-ohm Speakers

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540W Peak (180W RMS) 6.5" HED Series 2 Way Coaxial 4-ohm Speakers

• 360 watts Peak Each, 120 watts RMS Each
• 1" PEI (Polyetherimide) Balanced Dome tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 88 dB

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Alpine DM-65C-G

400W Peak (100W RMS) 6.5" DM Series 2-Way Component 4-ohm Car Speakers

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400W Peak (100W RMS) 6.5" DM Series 2-Way Component 4-ohm Car Speakers

• 200 watts Peak Each, 50 watts RMS Each
• 0.8" Teteron Dome Tweeters
• Injection Molded Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 92 dB

Free Speaker Accessory at Checkout!
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List price $130.00
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Deaf Bonce Apocalypse AP-M61AC PRO (M61AC PRO)

720W Peak (360W RMS) 6.5" Apocalypse Series Pro Audio Midrange 4-ohm Speakers

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720W Peak (360W RMS) 6.5" Apocalypse Series Pro Audio Midrange 4-ohm Speakers

• 360 watts Peak Each, 180 watts RMS Each
• Pressed Paper cone material
• Impedance: 4 ohm
• Sensitivity: 101.9 dB

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List price $199.99
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Deaf Bonce Machete MFC-615

320W Peak (160W RMS) 6.5" Machete Series 2 Way Component 4-ohm Speakers

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320W Peak (160W RMS) 6.5" Machete Series 2 Way Component 4-ohm Speakers

• 160 watts Peak Each, 80 watts RMS Each
• Impedance: 4 ohm
• Sensitivity: 91.7 dB

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NVX - Worth the Envy - Direct to Consumer Car Audio

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    FAQ for Speakers in 2005 STS

    Q: Can I upgrade or change the Speakers in 2005 Cadillac STS?

    A: Yes this page includes all the best Speakers that work in your STS.

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    Modern vehicles often require specific brackets, wiring harnesses, and mounting solutions. A fit guide ensures:

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    Whether you're replacing a factory stereo or upgrading your entire audio system, the Fit Finder eliminates uncertainty.