would this unit require an additional crossover for some one building a sub?

No, this work perfect for Sub with only direct signal from mixer. This have filters and frequency variant in the controls. It's a excelent product for subs

What’s it mean when the green power light flickers Red.?

That means you are driving the amp beyond its limits and driving it into clipping which may damage the amp as well as the driver.

Would a lower impedance sub like a jl audio 8w77 @3ohms work with this amplifier?

It is not recommended to use any driver with an impedance under four ohms.

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Dayton Audio SPA500 500W Subwoofer Plate Amplifier

Dayton Audio SPA500 500W Subwoofer Plate Amplifier

Product ID: 5404630

Details

Brand
Dayton Audio
Item dimensions L x W x H
5.24 x 11.94 x
Manufacturer
Dayton Audio
Mounting Type
Clip On
Voltage
5 Volts

⚡500W Class-AB clean power

🔊Custom low-frequency parametric EQ

🔋Patented high-efficiency downconverter

€ 817.28

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Description

🔊 Unleash the bass beast with precision power!

TAILOR YOUR BASS - Low frequency parametric EQ lets you boost or cut frequencies to craft the perfect subwoofer response for your space.
TOROIDAL TRANSFORMER TECH - Premium toroidal power supply transformer ensures stable, noise-free power for consistent, deep bass impact.
PURE POWER ZERO DISTORTION - High power Class-AB output delivers crystal-clear, controlled bass without muddying your soundscape.
EFFICIENCY MEETS PERFORMANCE - Patented tracking downconverter power supply maximizes energy use, keeping your system cool and green.
BUILT TO PROTECT DESIGNED TO IMPRESS - Advanced soft clip circuitry expands headroom and safeguards your woofers from damage during intense sessions.

The Dayton Audio SPA500 is a 500W Class-AB subwoofer plate amplifier featuring a patented high-efficiency downconverter power supply, a toroidal transformer for stable power delivery, and a customizable low-frequency parametric EQ. Its advanced soft clip circuitry protects your speakers while delivering clean, controlled bass, making it an essential upgrade for audiophiles seeking powerful, tailored low-end performance.

Specifications

ASIN	B0048FHWL8
Best Sellers Rank	#298,035 in Electronics ( See Top 100 in Electronics ) #1,351 in Audio & Video Distribution Wall Plates
Brand Name	Dayton Audio
Customer Reviews	4.3 4.3 out of 5 stars (43)
Global Trade Identification Number	00844632015922
Item Dimensions	5.24 x 11.94 x 11.94 inches
Manufacturer	Dayton Audio
Material Type	Hercules
Model	SPA500
Mounting Type	Clip On
Number of Channels	1
Output Power	273 Watts
Package Type Name	Box
Part Number	300-807
Specification Met	FCC
Supply Current	4.7 Amps
UPC	844632015922
Voltage	5 Volts

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