Garage
Shop

See all parts that fit your 2004 Jetta

Sundown Audio SIA-2500D (A-SIA2500)

2500W RMS Class D SIA Series Monoblock Car Amplifier

Limited time!
highlight-star-icon

• 2000 watts x 1 channel @ 4 ohm
• 2500 watts x 1 channel @ 2 ohm
• 2500 watts x 1 channel @ 1 ohm
• Total RMS Power: 2500 watts
• Class D 1 ohm Stable Monoblock Amplifier

Learn more about the sia2500
Universal fit Icon

Universal – fits most vehicles.

Similar items | Update vehicle | Vehicle store
List price $461.99
Thanks , You Pay:
-17%

$384.99

 with warranty
Starting at $35/mo or 4 payments of $97 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.

Save 30% off an NVX XKIT02 Amp Kit at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.
Dollar Icon
VIP Product Get $38.50 in rewards to spend later
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

Loading...
82-7806 main

Metra 82-7806

Speaker Adapter Plate fits select Volkswagen and 1998-2007 Honda Accord (Pair)

1
-21.06%

$14.99

List price $18.99

72-9001 main

Metra 72-9001

Install New Speakers in select 1998-2023 vehicles from Volkswagen, Porsche, Mercedes-Benz

4
XBAF65 main

NVX XBAF65

Universal 6.5" Waterproof Silicone Rubber Speaker Baffle Ring Kit (Pack of 2)

116
-37.15%

$21.99

List price $34.99

Limited time!
XAV-AX8500 main

Sony XAV-AX8500

10.1" Single DIN Floating Touchscreen Digital Multimedia Receiver with Bluetooth, Wireless Apple CarPlay, and Wired Android Auto (SiriusXM Ready)

2
-20.20%

$798.00

List price $999.99

R165X3 main

Rockford Fosgate Prime R165X3

180W Peak (90W RMS) 6.5" Prime Series 3 Way Coaxial 4-ohm Speakers

154
Limited time!
XAV-AX3200 main

Sony XAV-AX3200

6.95" Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, WebLink, Apple CarPlay, and Android Auto (SiriusXM Ready)

14
-25.50%

$298.00

List price $399.99

TWPZ main

DS18 TWPZ

80W Peak (40W RMS) 1" Slim Dome Super Tweeters

6
DPX505BT main

Kenwood DPX505BT

Double DIN CD Receiver with Bluetooth and Built-in Alexa (Sirius XM Ready)

18
-22.17%

$179.00

List price $230.00

AP-M61SE main

Deaf Bonce Apocalypse AP-M61SE

520W Peak (260W RMS) 6.5” Apocalypse Series Midrange 4-ohm Speakers

8
DPX305MBT main

Kenwood DPX305MBT

Double DIN Digital Media Receiver with Bluetooth and Built-in Alexa (SiriusXM Ready)

15
-20.50%

$159.00

List price $200.00

Current Promotions (5 offers)


This offer cannot be combined with any other coupons or offers.

Sundown Audio SIA-2500D (A-SIA2500)

15% off


Priced separately $464 98

Promo Savings of $12 00

Total price:

$452 98

This offer cannot be combined with any other coupons or offers.

Sundown Audio SIA-2500D (A-SIA2500)

20% off


Priced separately $434 98

Promo Savings of $10 00

Total price:

$424 98

This offer cannot be combined with any other coupons or offers.

Sundown Audio SIA-2500D (A-SIA2500)

20% off


Priced separately $494 98

Promo Savings of $22 00

Total price:

$472 98

This offer cannot be combined with any other coupons or offers.

Sundown Audio SIA-2500D (A-SIA2500)

30% off


Priced separately $577 97

Promo Savings of $57 89

Total price:

$520 08

This offer cannot be combined with any other coupons or offers.

Sundown Audio SIA-2500D (A-SIA2500)

30% off


Priced separately $523 98

Promo Savings of $41 70

Total price:

$482 28

Description


Sundown Audio brand icon

Authorized dealer


Sundown Audio SIA-2500D (A-SIA2500)

Delivering tremendous power at 1, 2, or 4 ohms, the Sundown SIA amps are built with power and stability at their core. These full-bridge amplifiers feature a heavy heatsink for outstanding thermal management, while the three-speed Smart Cooling fan and advanced power supply design protects the amplifier from overheating and distorted output. Made to bang all day long, by the world champions of bass!


Product Details:

  • SIA Series Class D 1 ohm Stable Monoblock Amplifier
  • RMS Power Rating:
    • 4 ohm: 2000 watts x 1 channel
    • 2 ohm: 2500 watts x 1 channel
    • 1 ohm: 2500 watts x 1 channel
  • Total RMS power output: 2500 watts
  • Power, protection and clipping LED indicators
  • Wired bass level remote control with clipping indicator included
  • 4-way protection circuitry (thermal, voltage, speaker short and DC offset protection)
  • Dual MOSFET PWM power supply
  • Advanced 3-speed smart cooling fan design
  • Intelligent full bridge design
  • Input sensitivity:
    • Low level: 0 - 5 volts
  • Signal to Noise Ratio: 108 dB
  • Variable low-pass filter: 40 - 20000 Hz
  • Variable high-pass filter: 10 - 1000 Hz
  • Variable Bass Boost: 0 - 12 dB
  • Fuse Rating: 220A
  • 1/0 AWG gauge amplifier wiring kit is recommended for installation
  • Dimensions: 7.25" L x 7.25" W x 2.45" H
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty
  • MFR #: SIA-2500D

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!
46CSC654 main

Kicker CSC65 (46CSC654)

600W Peak (200W RMS) 6.5” CS Series 2 Way Coaxial 4-ohm Speakers

123
-33.36%

$79.96

List price $119.99

Limited time!
Club 622 main

JBL Club 622

360W Peak (120W RMS) 6.5" Club Series 2-way Coaxial 3-ohm Speakers

5
-28.58%

$99.95

List price $139.95

43DSC6504 main

Kicker DSC650 (43DSC6504)

480W Peak (120W RMS) 6.5” DS Series 2-way 4-ohm Coaxial Car Speakers (DSC6504)

28
-10.53%

$84.99

List price $94.99

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
DB652 main

Polk Audio DB652 (DB 652)

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

12
-9.16%

$109.00

List price $119.99

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

NSP65 main

NVX NSP65

540W Peak (180W RMS) 6.5" N-Series 2 Way Coaxial Car Speakers

93
-35.19%

$69.99

List price $107.99

MPK 163.3 main

Hertz MPK163.3

600W Peak (300W RMS) 6.5" Mille PRO Series 3-way 4-ohm Component Speaker System

2
-14.89%

$999.99

List price $1175.00


Best selling similar products

NDA12001 small

NVX NDA12001

• 500 watts x 1 channel @ 4 ohm
• 850 watts x 1 channel @ 2 ohm
• 1200 watts x 1 channel @ 1 ohm
• Total RMS Power: 1200 watts
• Class D 1 ohm Stable Monoblock Amplifier

(13)

$169.99

List price $239.99

ATOM 1300.1 PRO small

Deaf Bonce Apocalypse ATOM 1300.1 PRO

• 490 watts x 1 channel @ 4 ohm
• 780 watts x 1 channel @ 2 ohm
• 1300 watts x 1 channel @ 1 ohm
• Total RMS Power: 1300 watts
• Class D 1 ohm Stable Monoblock Amplifier

$199.90

List price $199.90

VAD17001v2 small

NVX VAD17001 v2 (VAD17001v2)

• 800 watts x 1 channel @ 4 ohm
• 1350 watts x 1 channel @ 2 ohm
• 1700 watts x 1 channel @ 1 ohm
• Total RMS Power: 1700 watts
• Class D 1 ohm Stable Monoblock Amplifier

(35)

$259.99

List price $335.99

VAD10001v2 small

NVX VAD10001 v2 (VAD10001v2)

• 420 watts x 1 channel @ 4 ohm
• 760 watts x 1 channel @ 2 ohm
• 1000 watts x 1 channel @ 1 ohm
• Total RMS Power: 1000 watts
• Class D 1 ohm Stable Monoblock Amplifier

(38)

$209.99

List price $227.99

JD1000/1 small

JL Audio JD1000/1

• 600 watts x 1 channel @ 4 ohm
• 1000 watts x 1 channel @ 2 ohm
• Total RMS Power: 1000 watts
• Class D 2 ohm Stable Monoblock Amplifier

(24)

$429.99

List price $429.99

JD500/1 small

JL Audio JD500/1

• 250 watts x 1 channel @ 4 ohm
• 500 watts x 1 channel @ 2 ohm
• Total RMS Power: 500 watts
• Class D 2 ohm Stable Monoblock Amplifier

(12)

$299.99

List price $299.99

VADM1 small

NVX VADM1 v2 (VADM1v2)

• 240 watts x 1 channel @ 4 ohm
• 400 watts x 1 channel @ 2 ohm
• 600 watts x 1 channel @ 1 ohm
• Total RMS Power: 600 watts
• Class D 1 ohm Stable Monoblock Amplifier

(16)

$189.99

List price $239.99

R2-1200X1 small

Rockford Fosgate Prime R2 R2-1200X1

• 400 watts x 1 channel @ 4 ohm
• 800 watts x 1 channel @ 2 ohm
• Total RMS Power: 1200 watts
• Class D 1 ohm Stable Monoblock Amplifier

(23)

$449.99

List price $449.99

Reference 10001A small

Infinity Reference 10001A (AMPRF10001AAM)

• 600 watts x 1 channel @ 4 ohm
• 1000 watts x 1 channel @ 2 ohm
• Total RMS Power: 1000 watts
• Class D 2 ohm Stable Monoblock Amplifier

$499.95

List price $569.95

NDA15001 small

NVX NDA15001

• 670 watts x 1 channel @ 4 ohm
• 1100 watts x 1 channel @ 2 ohm
• 1500 watts x 1 channel @ 1 ohm
• Total RMS Power: 1500 watts
• Class D 1 ohm Stable Monoblock Amplifier

(14)

$199.99

List price $287.99

Specifications & Details


Key Features
Amplifier Key Features
Bass Boost
Power Specifications - Subwoofer Channel
RMS Power @ 4 ohms
2000 watts x 1 channel
RMS Power @ 2 ohms
2500 watts x 1 channel
RMS Power @ 1 ohm
2500 watts x 1 channel
Amplifier Specifications
Series
SIA Series
Amplifier Class
D
Number of Channels
1 - Mono
Total RMS Power Output
2500 watts
Maximum Input Gauge Size
1/0 AWG
Minimum Impedance Unbridged
1 ohm
Built-in Crossover
Low-Pass (LP)
High-Pass (HP)
High-Pass Crossover Frequency
10 - 1000 Hz
Low-Pass Crossover Frequency
40 - 20000 Hz
Signal-to-Noise Ratio
108 dB
Bass Boost
0 - 12 dB
Remote bass/level controller
Yes
Total Fuse Rating
220A
Amp Bluetooth Connectivity
No
Hi-Res Certified
No
Low-Level Input Sensitivity
0 - 5 volts
What is in the box?
Paperwork
User manual
WITB: Amplifiers
Amplifier
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Item Details


Manufacturer:

Model Number:

SIA-2500D

Weight:

5.40lbs

Internal SKU:

sia2500

Internal Product ID:

206369

Customer Ratings & Reviews


Sundown Audio SIA-2500D (A-SIA2500) thumbnail image

5 star
100%
4 star
0%
3 star
0%
2 star
0%
1 star
0%



Durability
5
Value
5
Features
4.7
Design
5
Usability
4

Customer Photos & Videos


Customer Reviews

Sort by:

Loading...

I am really happy with this amp...mad my sa classic sound much better

By Jose on May 21, 2026 Checkmark Icon Verified purchase
2021 Jeep Cherokee


SIA2500D

This amp is small but packs a punch . I love the built in fan. It’s also nice how the logo is on both sides so reads good no matter which way you turn it lol. Sonic Electronics has been top notch on shipping and follow up messages to keep you informed throughout the shipping process. I just ordered a couple more things last night .

By Robert on October 7, 2025 Checkmark Icon Verified purchase


Gives me what I wanted!

Very good amp! Was able to push my sub to how I wanted, very clean design and great power. If you are looking for a budget friendly sundown amp the SIA series is the best choice!

By Angel on June 28, 2025 Checkmark Icon Verified purchase




DKGM-15 small

Crux DKGM-15

Stereo Replacement Interface with Steering Wheel Control Retention, Video Switcher, and Double DIN Dash Kit for select 2000-2013 vehicles from Chevrolet, GMC, Pontiac

(19)

$162.00

List price $252.00

CDA-9826 small

Alpine CDA-9826

$189.99

List price $249.99

C5-650x small

JL Audio C5-650x

(450W Max) Evolution C5 Series 6.5" 2-Way Coaxial Speaker System

(6)

$549.99

List price $599.99

KD-AVX33 small

JVC KD-AVX33

In-dash 3.5" TFT-LCD Monitor with BUILT-IN BLUETOOTH CAPABILITY, DVD, DivX Ultra, CD, MP3 Receiver, Remote and USB Input

(1)

$439.99

List price $649.99

FS110-W5-CG-WH small

JL Audio FS110-W5-CG-WH (Classic White Grille)

Sealed Marine Enclosed Subwoofer System with Single 10" M10W5-4 with Classic Grille

$699.99

List price $699.99

ZX-4722 small

Volfenhag ZX-4722

12" Dual 4 ohm High Power Subwoofer

(5)

$64.99

List price $199.99

RLC small

EFX RLC by Scosche

Universal Bass Remote Level Control Knob

(88)

$10.99

List price $29.99

TS-C720PRS small

Pioneer Premier TS-C720PRS

6-3/4" (Oversized 6-1/2") 2-way PRS Premier Reference Series Component System

(12)

$254.99

List price $549.99

Related Searches



Available Deal
SIA-2500D main
Offer may end without notice

Eligible items

Shop items below for 30% off up to $100 discount on Save 30% off an NVX Amp Kit!

NVX XKIT02

$179.99

$125.99

$54 Savings!

Add to cart

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

2004 Volkswagen Jetta

2000 Audi A4

1986 Pontiac 6000

2003 Saturn L200

2017 Chevrolet Camaro

2007 Jeep Liberty

1989 Dodge Daytona

2011 Mitsubishi Eclipse

2006 MINI Cooper

1998 Lincoln Continental

Vehicle
Store
Delete

2016 Can-Am Commander Max 1000 XT

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.