Can u run 8 speakers on this?

Yes you can. Two speakers per channel in parallel but make sure that the impedence of each speaker is 4 ohms or more because the minimum impedence that this amp can work in a stable condition is 2 ohms. Also keep in mind that each speaker will get around 100-115 watts.

Can i hook up tweeters, two front 90w rms and two 45w rms speakers to this?

I have tweeters on mine with 2 6.5s running in HPF.

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Skar Audio SK-M4004D Compact Full Range Class D 4 Channel Car Amplifier 400W

Skar Audio SK-M4004D Compact Full Range Class D 4 Channel Car Amplifier 400W

Product ID: 746648767

Details

Item dimensions L x W x H
20.1 x 11.8 x
Manufacturer
Skar Audio
Maximum Supply Voltage
14.4 Volts
Minimum Supply Voltage
14 Volts (DC)
Voltage
14.4 Volts

⚡400W max power output

📏Ultra-compact 7.9" x 4.6" x 1.7" size

🎚️Adjustable HPF/LPF crossover control

E£ 45373

Duties & taxes included

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Sold byAmazon EGYPTDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎵 Compact Powerhouse: Big Sound, Small Package, Zero Compromise!

BUILT TO LAST - 4-way protection circuits guard against thermal, voltage, speaker, and DC faults for worry-free driving.
SPACE SAVVY DESIGN - Super compact footprint fits seamlessly in tight car interiors without compromise.
PRECISION SOUND CONTROL - Customizable high-pass, low-pass, and full-range crossover settings for tailored audio.
PLUG PLAY INSTALLATION - High-level input and adapter harness simplify setup—no RCA cables needed.
POWER PACKED PERFORMANCE - Delivers 140W x 4 channels at 2Ω for crystal-clear sound that fills your ride.

The Skar Audio SK-M4004D is a compact yet powerful 4-channel Class D car amplifier delivering up to 400 watts total output. Engineered with high-speed MOSFET technology and versatile crossover controls, it offers premium sound customization in a space-saving design. Its high-level input and adapter harness enable easy installation without RCA cables, while built-in protection circuits ensure durability and reliability on the road.

Specifications

ASIN	B01EQX5ORK
Amazon Bestseller	#1,091,562 in Automotive ( See Top 100 in Automotive ) #128 in Car Multichannel Amplifiers
Brand Name	Skar Audio
Customer Reviews	4.2 4.2 out of 5 stars (446)
Global Trade Identification Number	00739189979165
Included Components	Skar Audio SK-M4004D Compact Full Range Class D 4-Channel Amplifier
Item Dimensions	20.1 x 11.8 x 4.2 cm
Item Type Name	Car Amplifier
Item Weight	1.7 kg
Manufacturer	Skar Audio
Material Type	mosfet
Maximum Supply Voltage	14.4 Volts
Minimum Supply Voltage	14 Volts (DC)
Model	SK-M4004D
Mounting Type	Surface Mount
Number of Channels	4
Output Power	400 Watts
Part Number	SK-M4004D
UPC	739189979165
Unit Count	1.0 Count
Voltage	14.4 Volts

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