Garage
Shop

See all parts that fit your 2010 RX-8

Sundown Audio SML-8 D4 8" (SML8D4)

800W Peak (400W RMS) 8" SML Series Dual 4-ohm Shallow Car Subwoofer (SW-SML8D4)

Sundown Audio
Shop all Sundown Audio
highlight-star-icon

• Peak Power: 800 watts
• RMS Power: 400 watts
• Impedance: Dual 4 ohm
• Pressed Paper cone
• Pressed Foam surround
• Mount depth: 3.9"
• Sensitivity: 82.5 dB

Learn more about the sml8d4
Universal fit Icon

Universal – fits most vehicles.

Similar items | Update vehicle | Vehicle store
List price $203.99
Thanks , You Pay:
-7%

$189.99

 with warranty
Starting at $18/mo or 4 payments of $48 Buy now, pay later and installment payment plans are offered by Afterpay and Affirm. Learn more

Heads up

Your vehicle can use this product in multiple locations. Only a quantity of one can be selected from the product page. You will have the option to adjust the quantity within your cart.

shipping truck icon Free shipping in USA. Provide zip for delivery date.
Quantity
In Stock
Brand new

Buy it now


Acima Logo

No Credit Option

Flexible Lease Payments

Early Purchase Options

Quick Approval Decision

Extend logo

Keep your product protected longer! Extend the warranty after the manufacturer warranty expires. 

  • Hassle-free immediate replacement within minutes!
  • Easy online claims 24/7
  • Covers product breakdowns and failures
Swoosh Icon Icon of Swoosh

For over 25 years, we've been your X-Factor – the team dedicated to having the biggest impact on your shopping experience!

Award winning icon
Award-Winning Service
Shipping icon
FREE Shipping Orders $49+
60 days return policy icon
60-Day Easy Returns
lowest price guarantee icon
Guaranteed Lowest Price
inHouseExpert
In-House Experts
NVX - Worth the Envy - Direct to Consumer Car Audio

Loading...
DMH-1800NEX main

Pioneer DMH-1800NEX

6.8" Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Apple CarPlay, Android Auto, and SiriusXM Ready

3
-19.05%

$339.99

List price $420.00

Limited time!
46CSC6934 main

Kicker CSC693 (46CSC6934)

900W Peak (300W RMS) 6x9” CS Series 3 Way Coaxial 4-ohm Speakers with Integrated Midrange Speakers

40
-30.02%

$111.96

List price $159.99

UTE-73BT main

Alpine UTE-73BT

Single DIN Digital Media Receiver with Bluetooth

44
-16.69%

$149.95

List price $180.00

CV15BT main

Cerwin-Vega CV15BT

Single Din Digital Media Receiver with Bluetooth

3
Limited time!
DMH-W3050NEX main

Pioneer DMH-W3050NEX

6.8" Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Wireless Apple CarPlay and Android Auto, and Built-in Alexa (Sirius XM Ready)

1
-24.20%

$469.99

List price $620.00

SXE-6926S main

Alpine SXE-6926S

280W Peak (90W RMS) 6x9” SXE Series 2-way 4-ohm Coaxial Speakers

13
-20.84%

$56.99

List price $71.99

R169X2 main

Rockford Fosgate Prime R169X2

260W Peak (130W RMS) 6x9" Prime Series 2 Way Coaxial 4-ohm Speakers

49
REF697F main

Infinity REF697F (INFSPKRF697FUS)

600W Peak (200W RMS) 6x9" Reference Series 2-Way Coaxial 4-ohm Speakers

6
-17.65%

$139.95

List price $169.95

PNW-69CS2 main

AudioControl PNW-69CS2

250W RMS 6x9″ PNW Series 2-way 3-ohm Component Speaker System

1
-5.42%

$349.00

List price $369.00

TERMINATOR69 main

MTX Audio TERMINATOR69

240W Peak (120W RMS) 6x9" Terminator Series 2 Way Coaxial 4-ohm Speakers

1
-11.12%

$79.95

List price $89.95

Current Promotions (1 offer)


Get a Free roll of Belva 16 Gauge Speaker Wire. Simply click the "Add Both to Cart" button and you will see your savings at checkout. This offer cannot be combined with any other coupons or offers.

Sundown Audio SML-8 D4 8" (SML8D4)

100% off


Priced separately $202 98

Promo Savings of $12 99

Total price:

$189 99

Description


Sundown Audio brand icon

Authorized dealer


Sundown Audio SML-8 D4

The SML series is a revolutionary line of subwoofers offered by Sundown Audio. An inch shallower than our SLD series, it delivers nearly the excursion, making it an ideal choice for customers seeking an extremely shallow driver with deep bass. Designed to fit under or behind your seat, the SML series performs exceptionally well in small enclosures.


Product Details:

  • 8" Dual 4 ohm SML Series Shallow Subwoofer
  • Power Handling:
    • Peak: 800 watts
    • RMS: 400 watts
  • Pressed Paper Cone
  • Pressed Foam Surround
  • Custom tooled cone shape for reduced noise over high excursion
  • Stitched-on “Mini-XL” tinsel Leads to prevent fatigue and failure
  • Vented pole-piece and vented magnetic gap
  • Dual-magnet design for smooth acoustic response
  • 2.25" High Temperature Copper Voice coil on black aluminum former
  • High temperature 4-layer copper voice coil wire
  • 14 mm Xmax
  • Double Stacked magnet motor structure
  • Bolt-through motor design to ensure maximum longevity
  • Resonance Frequency (Fs): 43.25 Hz
  • Sensitivity: 82.5 dB
  • Recommended sealed box volume: 0.2 cubic feet - 0.35 cubic feet
  • Top-mount depth: 3.9"
  • Cutout diameter: 7.65"
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

  • Priced Individually

Subwoofer Wiring Guide


Wiring Guide to Wire 1 Sundown Audio SML-8 D4 8" (SML8D4) Subwoofer

Mono Amp

2 Channel Amp - Bridged

Wiring Guide to Wire 2 Sundown Audio SML-8 D4 8" (SML8D4) Subwoofers

Mono Amp

Mono Amp - Option 1

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp - Bridged

Wiring Guide to Wire 3 Sundown Audio SML-8 D4 8" (SML8D4) Subwoofers

Mono Amp

4 Channel Amp

Wiring Guide to Wire 4 Sundown Audio SML-8 D4 8" (SML8D4) Subwoofers

Mono Amp

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp


Best selling similar products

47KBRW8 small

Kicker 47KBRW8 ReFLEX™

• 8" ReFLEX™ Passive Radiator
• Rubber covered plastic Cone
• Rubber Surround

(1)

$49.99

List price $59.99

VCW82v3 small

NVX VCW82 Version 3 (VCW82v3)

• Peak Power: 1300 watts
• RMS Power: 650 watts
• Impedance: Dual 2 ohm
• Carbon Fiber Enhanced Non-Pressed Paper Cone
• High Roll Foam Surround with black nylon stitching
• Mount depth: 5.31"
• Sensitivity: 83 dB (1W/1m)

(12)

$169.99

List price $203.99

R2-W8D2 small

Alpine R2-W8D2

• Peak Power: 1000 watts
• RMS Power: 350 watts
• Impedance: Dual 2 ohm
• Kevlar Reinforced Pulp Paper Cone
• High-Amplitude Multi-Roll (HAMR) Surround
• Mount depth: 4.56"
• Sensitivity: 83.6 dB

$239.95

List price $360.00

VCW84v3 small

NVX VCW84 Version 3 (VCW84v3)

• Peak Power: 1300 watts
• RMS Power: 650 watts
• Impedance: Dual 4 ohm
• Carbon Fiber Enhanced Non-Pressed Paper Cone
• Custom High Roll Foam Surround with black nylon stitching
• Mount depth: 5.31"
• Sensitivity: 83 dB (1W/1m)

(15)

$169.99

List price $203.99

SW-EV68D2 small

Sundown Audio E8 v.6 D2 8" (E8V6D2)

• Peak Power: 800 watts
• RMS Power: 400 watts
• Impedance: Dual 2 ohm
• Pressed Paper Cone
• Pressed Foam Surround
• Mount depth: 4.98"
• Sensitivity: 82.4 dB

$169.99

List price $203.99

R2-W8D4 small

Alpine R2-W8D4

• Peak Power: 1000 watts
• RMS Power: 350 watts
• Impedance: Dual 4 ohm
• Kevlar Reinforced Pulp Paper Cone
• High-Amplitude Multi-Roll (HAMR) Surround
• Mount depth: 4.56"
• Sensitivity: 83.7 dB

$239.95

List price $360.00

8W3V3-4 small

JL Audio 8W3V3-4

• RMS Power: 250 watts
• Impedance: Single 4 ohm
• Mineral-Filled Polypropylene Cone
• Nitrile Butadiene Rubber NBR Surround
• Mount depth: 4.63"
• Sensitivity: 83.24 dB

(45)

$349.99

List price $349.99

L7S82 small

Kicker L7S82 (44L7S82)

• Peak Power: 900 watts
• RMS Power: 450 watts
• Impedance: Dual 2 ohm
• Injection Molded Polypropylene Cone
• Ribbed Santoprene Surround
• Mount depth: 4-3/4"
• Sensitivity: 82.37 dB

(1)

$175.96

List price $239.99

8W1v3-4 small

JL Audio 8W1v3-4


• RMS Power: 150 watts
• Impedance: Single 4 ohm
• Mica Injected Polypropylene - MIPP Cone
• Nitrile Butadiene Rubber NBR Surround
• Mount depth: 3.86"
• Sensitivity: 84.8 dB

(10)

$199.99

List price $199.99

DES84 small

Diamond Audio DES84

• Peak Power: 500 watts
• RMS Power: 250 watts
• Fiber-Reinforced High Strength Paper Cone
• Impedance: Dual 4 ohm
• Sensitivity: 82.1 dB

$239.99

List price $219.99

Specifications & Details


Subwoofer Specifications
Series
SML Series
Subwoofer Size
8"
Peak Power Handling
800 watts
RMS Power Handling
400 watts
Voice Coil(s)
Dual
Impedance (Per Voice Coil)
4 ohm
Voice Coil Material
Copper
Voice Coil Diameter
2.25"
Sensitivity
82.5 dB
Xmax (millimeters)
14 mm
Subwoofer Design
Round / Circle
Main Cone Color
Black
Woofer Composition
Pressed Paper
Woofer Surround
Pressed Foam
Magnet Structure
Double Stacked
Subwoofer Grille
No
Re-Cone Kit Available
No
CTA-2031 Compliant
No
Recommended Enclosure Specifications
Recommended Enclosure Type
Sealed
Minimum Sealed Box Volume
0.2 cubic feet
Maximum Sealed Box Volume
0.35 cubic feet
Top-Mount Depth (Mounting Depth)
3.9"
Cutout Diameter
7.65"
Shallow Mount Installation
Yes
T/S Parameters (Electromechanical)
Free-Air Resonance (Fs)
43.25 Hz
Equivalent Compliance (Vas)
7.246 liters
Total Speaker Q Value (Qts)
0.432
Electrical Q Value (Qes)
0.512
Electrical Resistance of Voice Coil (Re)
6.85 ohm
Mechanical Q Value (Qms)
2.796
What is in the box?
WITB: Subwoofers
Subwoofer
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Item Details


Manufacturer:

Model Number:

SW-SML8D4

Weight:

18.00lbs

Internal SKU:

sml8d4

Internal Product ID:

206517

Customer Ratings & Reviews


Sundown Audio SML-8 D4 8

5 star
0%
4 star
0%
3 star
0%
2 star
0%
1 star
0%



Durability
0
Value
0
Features
0
Design
0
Usability
0

Customer Reviews

Sort by:

Loading...
Sorry, no reviews found


XD-RPW1/0-50 small

JL Audio XD-RPW1/0-50

1/0 AWG 50 ft (15.2 m) Spool of Translucent Red Power Wire

$749.99

List price $749.99

NXL-X360.2D small

DS18 Hydro NXL-X360.2D

1000W Peak (500W RMS) Class D NXL Series 2-Channel Marine and Powersports Amplifier

$479.95

List price $479.95

HE-CHASE-COB5M small

Metra HE-CHASE-COB5M

16.4 ft Chasing Chip-on-Board (COB) LED Strip Light Kit

$254.99

List price $283.99

CPX 690, SDSK2, XBAF69, SDRLR1 small

Hertz CPX 690 with Speaker Installation Kit

6 x 9" Cento Series 3-Way Coaxial Car Speakers with Speaker Baffles, Sound Dampening and Roller

(118)

$536.41

List price $673.72

PP0718-IAK small

Select Increments Pillar-Pods (PP0718-IAK)

Custom-fit speaker pods 4" Kicker speakers for select 2007-2018 vehicles from Jeep

(2)

$204.94

List price $214.94

APX-S8-FO1 small

iDataLink Maestro APX-S8-FO1 Dash Kit and Harness

APX 8" Floating Stereo Dash Kit and Harness for select 2011-2022 vehicles from Ford, Lincoln

(1)

$229.99

List price $279.99

Related Searches


Save up to 10 different vehicles in your garage
Vehicle
Store
Delete

2016 Buick Envision

2010 Mazda RX-8

2013 Dodge Challenger

2006 Bentley Continental

2013 BMW X1

1995 Mercury Cougar

2012 Toyota Avalon

2004 Toyota Matrix

2006 Kia Sorento

2009 Mitsubishi Eclipse

Add vehicle Clear all vehicles
Where to find vehicle info
Are you sure you want to clear your garage?
This action cannot be undone. Confirm
This page was not designed for products.
If you continue, you will be redirected to a category customized for your vehicle. Continue
Loading...
Identify your vehicle and submodel details
  • Owner's manual
  • Vehicle's insurance card
  • Vehicle registration
  • Vehicle produced after 2005: Inside driver's side door
  • Vehicle produced before 2005: Rear passenger doorjamb, glove box, center console, or engine compartment
Car Info Side Door Icon
Vehicle Registration Icon
Vehicle Insurance Icon

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

  • You see only parts engineered for your exact vehicle
  • You avoid incompatible radios, speakers, or wiring
  • Installation is smoother, faster, and frustration-free
  • You get the correct accessories the first time

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