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1998 Kia Sephia

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Subwoofers and enclosures, specifically designed for your 1998 Sephia, as well as universal fit solutions

Overview Upgrade your Stereo Upgrade your Speakers Add a Subwoofer Add an Amplifier Digital Sound Processors Audio Installation & Accessories Add a Backup Camera Dads & Grads Sale

Subwoofers and Boxes for 1998 Kia Sephia

A subwoofer that works with, or is designed for, your 1998 Kia Sephia will add bass, clarity and depth to your music and system. A quality subwoofer will give realism and an overall rich, complete sound that you otherwise would not get with a factory car sound system.

Subwoofer bass packages

Universal Subwoofer Bass Packages

These packages include an amp, sub(s), an enclosure and amplifier wiring. They should fit your Kia Sephia, but verify your trunk/rear vehicle area.

Universal Subwoofers

Universal Subwoofers

These sub(s) are perfect for adding to a empty box or custom built enclosure. They should work with your Kia Sephia, but verify your trunk/rear vehicle area.

Universal-fit loaded and powered sub boxes

Universal-fit Loaded Subwoofer Boxes

These boxes include sub(s) and some include an amp. They should fit your Kia Sephia, but verify your trunk/rear vehicle area.

Universal-fit empty unloaded sub boxes

Empty Universal-fit Sub Box Enclosures

These boxes are ready for you to add a sub and amp. They should fit your ride, but verify your trunk/rear vehicle area.

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RMS Power Handling
The RMS power is the amount of power the speaker requires to operate safely and properly. RMS Power Handling refers to the amount of power a speaker can handle on a continuous basis. We recommend powering your speakers or subwoofer with 80%-120% of its recommended RMS rating. The RMS power handling specification is typically rated per speaker unless otherwise noted.
Peak Power Handling
Peak power handling refers to the amount of power a speaker can handle during a brief musical burst. The RMS power range figure is a much more reliable rating for determining the speaker's power requirements. The Peak power handling specification is typically rated per speaker unless otherwise noted.
Series
Many brands group their products into series or lines of products to help customers know the level of quality (good, better, best for example). You can filter by series and the brand using our guided browsing.
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CompRT Series (42)
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Subwoofer Size
Refers to the diameter of the subwoofer, measured in inches.
Shallow Mount Installation
This means that the subwoofer/speaker is designed to be installed in areas that do not have a lot of space. Shallow mount subwoofers are typically found under a seat or behind the seat in some trucks.

Shallow mount speakers will typically have a mounting depth of 2" or less, while shallow mount subwoofers will typically have a mounting depth of 3" or less.
Top-Mount Depth (Mounting Depth)
The depth when installed on top of the mounting surface. Measured from the bottom of the speaker's magnet to the bottom of the mounting holes on the rim of the speaker.
Voice Coil(s)
Dual voice coil subs have more wiring flexibility than single voice coils subs; however, single voice coil subwoofers provide easier hookup options for wiring multiple subwoofers in parallel or series. You may also run a dual voice coil (DVC) sub in parallel, series, or combination. A quad voice coil has four voice coils and is equal to two dual voice coil subwoofers as far as wiring goes.
Impedance (Per Voice Coil)
The load value (in ohms) that the speakers present to the amplifier per voice coil - the amount of resistance to the current flow. This is a key specification as subs wired in parallel or low impedances can create problems with your amplifier and potentially void all warranties. We encourage you to ask our support department prior to purchase if you do not understand which impedance level will suit your application best.
Subwoofer Design
This is the design of the subwoofer or the opening of the subwoofer enclosure. Each design has it's own benefits, whether it is a square, circle, or oval.

Round/Circle: This is the typical and common subwoofer design. They have a round cone and are a circle in design.

Square: These woofers are able to achieve a greater cone area in a smaller space. Because of the greater surface area, some square subwoofers will be louder than a round subwoofer of the same size.

Minimum Sealed Box Volume
This value indicates the minimum sealed box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
Maximum Sealed Box Volume
This value indicates the maximum sealed box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
Sensitivity
An efficiency or sensitivity rating tells you how effectively a speaker converts power into sound. The higher the number, the more efficient the speaker and the louder it will play with the same input power. An efficient speaker helps you maximize your available power. Most sensitivity ratings measure the speaker's output with 1 watt of input, 1 meter from the speaker. Some speakers' sensitivity is measured with 2.83 volts of input, instead of 1 watt.
  Efficiency (1w/1m) is not an accurate indicator of a subwoofer's output capability and should not be used as a comparison to other speakers or subwoofers to determine which one is "louder".
Main Cone Color
This is the color of the speaker's or subwoofer's cone.
Recommended Enclosure Type
This is the recommended type of enclosure that the subwoofer should be installed into. Some subwoofers are specially designed for particular enclosures.

Sealed: These enclosures completely enclose the air inside the box. These boxes produce a tight bass.

Ported/Vented: These enclosures have a slot of air to escape from the box. The result is a sound that has more "boom".

Bandpass: These are a combination of both sealed and ported enclosures. They can be very efficient, but require tuning for the best response.

Xmax (millimeters)
Typically measured in millimeters, the Xmax value is the measure of a speaker cone's maximum excursion in one direction while maintaining a linear behavior.
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JL Audio 10W7AE-3

750W RMS 10" W7AE Series Single 3-ohm Car Subwoofer

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JL Audio 10W7AE-3

750W RMS 10" W7AE Series Single 3-ohm Car Subwoofer

• RMS Power: 750 watts
• Impedance: Single 3 ohm
• Polypropylene Cone
• Polyester Foam Surround
• Mount depth: 8.5"
• Sensitivity: 84.3 dB

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Atrend 15SVR - Red Carbon Fiber

Empty Single 15" Vented Subwoofer Enclosure (Red)

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Atrend 15SVR - Red Carbon Fiber

Empty Single 15" Vented Subwoofer Enclosure (Red)

• 15" Single Ported Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Premium plush black carpet finish
• Carbon fiber pattern
• Signature miter and dado construction
• Bonded using proprietary trick glue
• Total box volume: 4.59 cubic feet

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NVX SMW10D4

700W Peak (350W RMS) 10" S-Series Shallow-Mount Dual 4-ohm Car Subwoofer

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NVX SMW10D4

700W Peak (350W RMS) 10" S-Series Shallow-Mount Dual 4-ohm Car Subwoofer

• Peak Power: 700 watts
• RMS Power: 350 watts
• Impedance: Dual 4 ohm
• Carbon Fiber Reinforced Polypropylene Cone
• Butyl Rubber Surround
• Mount depth: 3.23"
• Sensitivity: 88 dB

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Sundown Audio X-12 v.3 D2 12" (X12V3D2)

5000W Peak (2500W RMS) 12" X Series Dual 2-ohm Car Subwoofer (SW-XV312D2)

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Sundown Audio X-12 v.3 D2 12" (X12V3D2)

5000W Peak (2500W RMS) 12" X Series Dual 2-ohm Car Subwoofer (SW-XV312D2)

• Peak Power: 5000 watts
• RMS Power: 2500 watts
• Impedance: Dual 2 ohm
• Pressed Paper Cone
• Mega Roll V2 Surround
• Mount depth: 10.4"
• Sensitivity: 84 dB

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Kicker L7R124 (45L7R124)

1200W Peak (600W RMS) 12” Solo-Baric L7R Series Dual 4-ohm Subwoofer

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Kicker L7R124 (45L7R124)

1200W Peak (600W RMS) 12” Solo-Baric L7R Series Dual 4-ohm Subwoofer

• Peak Power: 1200 watts
• RMS Power: 600 watts
• Impedance: Dual 4 ohm
• Injection-molded SoloKon Cone
• Ribbed Santoprene Surround
• Mount depth: 6 7/8"
• Sensitivity: 86.7 dB

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Deaf Bonce Machete MF-08S D4

1200W Peak (600W RMS) 8” Machete Series Dual 4-Ohm Subwoofer

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Deaf Bonce Machete MF-08S D4

1200W Peak (600W RMS) 8” Machete Series Dual 4-Ohm Subwoofer

• Peak Power: 1200 watts
• RMS Power: 600 watts
• Pressed Paper Cone
• Foam Surround
• Impedance: Dual 4 ohm
• Mount depth: 4.56"
• Sensitivity: 84.30 dB

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Atrend 10TKLVS

Empty Single 10" Universal Truck Vented Subwoofer Enclosure

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Atrend 10TKLVS

Empty Single 10" Universal Truck Vented Subwoofer Enclosure

• 10" Single Universal Truck Ported Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Rounded corners heavy duty enclosure construction
• Miter and Dado construction
• Premium tuff-coat spray liner finish
• Silver spring loaded terminal cups
• Glued and braced with fasteners
• Total box volume: 1 cubic feet

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MTX SLH15X2

Empty Dual 15" Ported Enclosure

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MTX SLH15X2

Empty Dual 15" Ported Enclosure

• 15" Dual Ported Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Total box volume: 2.02 cubic feet
• Mounting hardware included

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NVX YSW124

1600W Peak (800W RMS) 12" Y-Series Dual 4-ohm Car Subwoofer

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NVX YSW124

1600W Peak (800W RMS) 12" Y-Series Dual 4-ohm Car Subwoofer

• Peak Power: 1600 watts
• RMS Power: 800 watts
• Impedance: Dual 4 ohm
• Enhanced Pressed Paper Cone
• High Roll Foam Surround
• Mount depth: 6.5"
• Sensitivity: 85 dB

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Belva BBX210BK (BLACK)

1.42 Total Cu Ft - Dual 10" 3/4" MDF Ported Subwoofer Box Enclosure with Custom Black Baffle

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Belva BBX210BK (BLACK)

1.42 Total Cu Ft - Dual 10" 3/4" MDF Ported Subwoofer Box Enclosure with Custom Black Baffle

• 10" Dual Ported Subwoofer Enclosure
• 3/4" Medium Density Fiberboard Construction
• Satin Black Panel
• Durable Black Carpet
• Pre-Lined with Poly-Fil
• Gold Speaker Terminals
• Total Box Volume: 1.42 Cubic Feet

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Sundown Audio SA-12 Classic D2 12" (SA12CLD2)

2000W Peak (1000W RMS) 12" SA Classic Series Dual 2-ohm Car Subwoofer (SW-SACL12D2)

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Sundown Audio SA-12 Classic D2 12" (SA12CLD2)

2000W Peak (1000W RMS) 12" SA Classic Series Dual 2-ohm Car Subwoofer (SW-SACL12D2)

• Peak Power: 2000 watts
• RMS Power: 1000 watts
• Impedance: Dual 2 ohm
• Competition Grade Paper Cone
• Treated Foam Surround
• Mount depth: 6.5"
• Sensitivity: 83.21 dB

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List price $407.99
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JL Audio 10W1v3-2

300W RMS 10" W1v3 Series Single 2-ohm Subwoofer

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JL Audio 10W1v3-2

300W RMS 10" W1v3 Series Single 2-ohm Subwoofer


• RMS Power: 300 watts
• Impedance: Single 2 ohm
• Mica Injected Polypropylene - MIPP Cone
• Rubber Surround
• Mount depth: 4.6"
• Sensitivity: 83.9 dB

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JL Audio 12TW3-D8

400W RMS 12" TW3 Series Dual 8-ohm Shallow Subwoofer

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JL Audio 12TW3-D8

400W RMS 12" TW3 Series Dual 8-ohm Shallow Subwoofer

• RMS Power: 400 watts
• Impedance: Dual 8 ohm
• Polypropylene-Mica Cone
• Rubber Surround
• Mount depth: 3.50"
• Sensitivity: 84.23 dB

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JL Audio 13TW5v2-4 - Pair

600W RMS 13.5" TW5v2 Series Single 4-ohm Shallow Car Subwoofer

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JL Audio 13TW5v2-4 - Pair

600W RMS 13.5" TW5v2 Series Single 4-ohm Shallow Car Subwoofer

• RMS Power: 600 watts
• Impedance: Single 4 ohm
• Mica Injected Polypropylene - MIPP Cone
• Santoprene Rubber Surround
• Mount depth: 2.625"
• Sensitivity: 85.63 dB

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• RMS Power: 600 watts
• Impedance: Single 4 ohm
• Mica Injected Polypropylene - MIPP Cone
• Santoprene Rubber Surround
• Mount depth: 2.625"
• Sensitivity: 85.63 dB

Kicker Comp DC12 (43DC122)

600W Peak (300W RMS) Loaded Dual 12" Vented Enclosure

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Kicker Comp DC12 (43DC122)

600W Peak (300W RMS) Loaded Dual 12" Vented Enclosure

• Ported enclosure with 2 12" Comp Series Subwoofer
• 300 watts RMS (600 watts Peak)
• Final Impedance: 2-ohm
• Dimensions: 17-1/4" L x 16" H x 32-7/16" W x 13-7/8" W2

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Kicker L7X121 (49L7X121)

2000W RMS 12" SoloX Series Dual 1-ohm Subwoofer

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Kicker L7X121 (49L7X121)

2000W RMS 12" SoloX Series Dual 1-ohm Subwoofer

• RMS Power: 1000 - 2000 watts
• Impedance: Dual 1 ohm
• Double-pressed pulp Cone
• UV-resistant Santoprene Surround
• Mount depth: 10-1/8"

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• RMS Power: 1000 - 2000 watts
• Impedance: Dual 1 ohm
• Double-pressed pulp Cone
• UV-resistant Santoprene Surround
• Mount depth: 10-1/8"

Rockford Fosgate Power T1 T1D210

11200W Peak (600W RMS) 10" Power Series Dual 2-ohm Car Subwoofer

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Rockford Fosgate Power T1 T1D210

11200W Peak (600W RMS) 10" Power Series Dual 2-ohm Car Subwoofer

• Peak Power: 1200 watts
• RMS Power: 600 watts
• Impedance: Dual 2 ohm
• Kevlar Reinforced Semi-Pressed Paper Cone
• Rubber Surround
• Mount depth: 6.375"
• Sensitivity: 83 dB

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Kicker CWRT82 (48CWRT82)

600W Peak (300W RMS) 8" CompRT Series Dual 2-ohm Shallow Car Subwoofer

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Kicker CWRT82 (48CWRT82)

600W Peak (300W RMS) 8" CompRT Series Dual 2-ohm Shallow Car Subwoofer

• Peak Power: 600 watts
• RMS Power: 300 watts
• Impedance: Dual 2 ohm
• UV-Treated Polypropylene Cone
• UV-resistant Santoprene Surround
• Mount depth: 2-11/16"
• Sensitivity: 81.8 dB

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Rockford Fosgate Punch P2 P2D4-10

600W Peak (300W RMS) 10" Punch Series Dual 4-ohm Car Subwoofer

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Rockford Fosgate Punch P2 P2D4-10

600W Peak (300W RMS) 10" Punch Series Dual 4-ohm Car Subwoofer

• Peak Power: 600 watts
• RMS Power: 300 watts
• Impedance: Dual 4 ohm
• Kevlar Reinforced Pulp Paper Cone
• Rubber Surround
• Mount depth: 5.92"
• Sensitivity: 84 dB

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Kicker CWTB102 (46CWTB102)

800W Peak (400W RMS) Loaded Dual 10" Subwoofer and Passive Radiator Tube Enclosure

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Kicker CWTB102 (46CWTB102)

800W Peak (400W RMS) Loaded Dual 10" Subwoofer and Passive Radiator Tube Enclosure

• Enclosure with 2 10" TB Series Subwoofer
• Loaded with active CompR woofer and passive Reflex sub
• 400 watts RMS (800 watts Peak)
• Final Impedance: 2-ohm
• Dimensions: 10-5/8" L x 17-1/16 H1 x 10-3/4 H2 x 16-9/16" W2

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    FAQ for Subwoofer and Sub Box Upgrades in 1998 Sephia

    Q: Can I upgrade or change the Subwoofer and Sub Box Upgrades in 1998 Kia Sephia?

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