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Deal.ai › Sundown Audio
Sundown Audio
SFB-1800.5 Sundown Audio SFB Series 5-Channel Full Range Amplifier
Sundown Audio

SFB-1800.5 Sundown Audio SFB Series 5-Channel Full Range Amplifier

Best price now

$499.99at DiscountCentralOnlineChecked 31 min ago

Compared across 19 stores. Prices are checked against each store and labelled with when.

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Price facts

  • Lowest price today: $499.99 at DiscountCentralOnline (checked Nov 11, 2026).
  • Checked at 19 stores.

Our take on the SFB-1800.5 Sundown Audio SFB Series 5-Channel Full Range Amplifier

The Sundown Audio SFB-1800.5 is a five-channel full-range car amplifier built in the compact "Brazilian style" full-bridge format. It runs four channels at 200W each at 4 ohms or 300W each at 2 ohms, plus a sub channel rated 250W at 4 ohms, 500W at 2 ohms and 1,000W at 1 ohm. Each channel has its own variable 12dB high-pass and low-pass filters, plus a 50Hz bass boost, so it can drive a full system without extra processors. It suits owners who want one small amp for front, rear and sub, and who accept that the sub channel needs a low-impedance load to make its rated power.

Best forOne-amp full-system buildsCompact installs with limited spaceOwners running 2-ohm speakersSub setups wired to 1 ohm
Pros
  • Five channels cover front, rear and sub from one chassis
  • Sub channel stable to 1 ohm and rated 1,000W there
  • Independent high-pass and low-pass filters on every channel
  • Bass boost, clipping indicators and full protection circuitry
  • Compact full-bridge design saves mounting space
Cons
  • Sub channel makes only 250W at 4 ohms
  • Full-bridge amps are known for electrical noise if grounding is poor
  • Wired remote with clipping indicator is optional, not included
  • Power figures assume a strong charging system

SFB-1800.5 Sundown Audio SFB Series 5-Channel Full Range Amplifier prices at every store

  • DiscountCentralOnlineNew

    In stockReturn policy

    $499.99Checked 31 min ago
    Visit DiscountCentralOnline
  • Pro Audio CenterNew

    In stockReturn policy

    $539.99Checked 31 min ago
    Visit Pro Audio Center
  • CybervalueNew

    In stockReturn policy

    $539.99Checked 31 min ago
    Visit Cybervalue
  • Best Sound Car AudioNew

    In stockReturn policy

    $539.99Checked 31 min ago
    Visit Best Sound Car Audio
  • Down4soundshopNew

    In stock

    $539.99Free shippingChecked 32 min ago
    Visit Down4soundshop
  • BigJeffOnlineNew

    In stock

    $539.99+ $19.90 shippingChecked 31 min ago
    Visit BigJeffOnline
  • Sundown AudioNew

    In stock

    $539.99+ $33.00 shippingChecked 31 min ago
    Visit Sundown Audio
  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $499.99Free shippingChecked 32 min ago
    Visit Amazon
  • WalmartNew

    Availability unknownSold by D-C-O

    $499.99Checked 32 min ago
    Visit Walmart
  • Amped Up Car AudioNew

    Availability unknown

    $499.99Checked 32 min ago
    Visit Amped Up Car Audio
  • The Amp LabNew

    Availability unknown

    $499.99Checked 32 min ago
    Visit The Amp Lab
  • mooncarstereoNew

    Availability unknown

    $539.99Checked 31 min ago
    Visit mooncarstereo
  • Liberty Bass ShopNew

    Availability unknown

    $539.99Checked 31 min ago
    Visit Liberty Bass Shop
  • Elite Auto GearNew

    Availability unknown

    $539.99Checked 31 min ago
    Visit Elite Auto Gear
  • Showtime ElectronicsNew

    Availability unknown

    $539.99Checked 31 min ago
    Visit Showtime Electronics
  • Hi-Tech Car AudioNew

    Availability unknown

    $539.99Free shippingChecked 32 min ago
    Visit Hi-Tech Car Audio
  • eBayNew

    Availability unknownSold by audiosavings

    $539.99Checked 32 min ago
    Visit eBay
  • SonicElectronix.comNew

    Availability unknown

    $539.99Checked 32 min ago
    Visit SonicElectronix.com
  • Car Audio BargainNew

    Availability unknown

    $539.99Checked 32 min ago
    Visit Car Audio Bargain

Also available at

  • Showtime ElectronicsCheck price at Showtime Electronics
  • Moon Car StereoCheck price at Moon Car Stereo
  • LibertyBassShop.comCheck price at LibertyBassShop.com
  • Big Jeff Online IncCheck price at Big Jeff Online Inc
  • Sundown AudioCheck price at Sundown Audio
  • Elite Auto GearCheck price at Elite Auto Gear

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SFB-1800.5 Sundown Audio SFB Series 5-Channel Full Range Amplifier price history

Lowest price we've seen: $499.99 on Nov 11 at Walmart. Tracked across 15 stores since Nov 11.

About the SFB-1800.5 Sundown Audio SFB Series 5-Channel Full Range Amplifier

The Sundown Audio SFB-1800.5 is a 5-channel full-range car amplifier from the SFB Series. It is a compact "Brazilian Style" design. Channel 5 is a bass channel that is stable down to 1 ohm.

Several speakers can be wired together on each channel. The amp can run a PA mid/high speaker array, a large marine system, or a set of separates, with channel 5 serving as a dedicated sub channel.

Variable 12dB high pass and low pass filters and a variable 12dB bass boost at 50Hz are built in. Power, protection and clipping indicators are included. Thermal, voltage, speaker short and DC-offset protection circuitry guards the amp. An optional wired remote control with a clipping indicator is available.

Amplifier type
5-channel full-range amplifier
Power at 1 ohm
1,000 W x 1 RMS (Ch. 5)
Power at 2 ohms
300 W x 4 (Ch. 1-4) + 500 W x 1 (Ch. 5) RMS
Power at 4 ohms
200 W x 4 (Ch. 1-4) + 250 W x 1 (Ch. 5) RMS
Low pass filter
Variable 12dB; 50Hz-6kHz (Ch. 1-4), 50Hz-20kHz (Ch. 5)
High pass filter
Variable 12dB; 15Hz-6kHz (Ch. 1-4), 50Hz-1kHz (Ch. 5)
Bass boost
Variable 12dB at 50Hz
Frequency response
10Hz-20kHz (-3dB)
Input impedance
56k ohms
Input sensitivity
5V max
Signal-to-noise
100dB
Supply voltage
9VDC minimum, 16VDC maximum
Working voltage
10.5V-15.5V
Recommended fuse
150A
Protection
Thermal, voltage, speaker short and DC-offset
Indicators
Power, protection and clipping
Remote
Optional wired remote control with clipping indicator
Dimensions
8.86 x 11.81 x 2.70 in
Documentation
Product manual

Questions and answers

How much power does the SFB-1800.5 make?
Four channels deliver 200W each at 4 ohms or 300W each at 2 ohms. The fifth channel delivers 250W at 4 ohms, 500W at 2 ohms and 1,000W at 1 ohm.
Can it run a whole system on its own?
Yes. Four full-range channels handle front and rear speakers, and the fifth channel drives a subwoofer. Each channel has its own crossover, so no separate processor is needed.
What impedance should the sub channel see?
It is stable down to 1 ohm, where it makes its full 1,000W. At 4 ohms it makes only 250W, so a 1-ohm or 2-ohm sub wiring gets the most from it.
Does it include a remote control?
A wired remote with a clipping indicator is optional and sold separately. The amp itself has power, protection and clipping indicators on the chassis.
What crossovers does it have?
Channels 1-4 have a 12dB low-pass from 50Hz to 6kHz and a high-pass from 15Hz to 6kHz. The sub channel has a low-pass from 50Hz to 20kHz and a high-pass from 50Hz to 1kHz, plus a 50Hz bass boost.
What protections does it have?
It guards against thermal overload, voltage faults, speaker shorts and DC offset, and shows power, protection and clipping status on its indicators.
Where is the SFB-1800.5 Sundown Audio SFB Series 5-Channel Full Range Amplifier cheapest?
At DiscountCentralOnline, for $499.99, as of our latest check.
Where can I buy the SFB-1800.5 Sundown Audio SFB Series 5-Channel Full Range Amplifier?
19 stores we checked sell it, including Sundown Audio, BigJeffOnline, mooncarstereo, Liberty Bass Shop, Elite Auto Gear.

Stores we've priced the SFB-1800.5 Sundown Audio SFB Series 5-Channel Full Range Amplifier at

  • BigJeffOnline deals and prices
  • SonicElectronix.com deals and prices
  • Walmart deals and prices

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