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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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 power output

🔋Patented high-efficiency downconverter PSU

🎚️Custom low-frequency parametric EQ

NZ$1611

Duties & taxes included

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Description

🔊 Unleash the bass beast with precision power!

TAILOR YOUR BASS - Low frequency parametric EQ lets you sculpt your subwoofer’s sound to fit your unique space and vibe.
TOROIDAL TRANSFORMER TECH - Premium toroidal power supply transformer ensures stable, noise-free power for crystal-clear audio.
PURE POWER ZERO DISTORTION - High power Class-AB output delivers clean, controlled bass that commands attention.
EFFICIENCY MEETS PERFORMANCE - Patented tracking downconverter power supply maximizes energy use, keeping your system cool and green.
BUILT TO PROTECT BUILT TO PERFORM - Advanced soft clip circuitry safeguards your woofers while expanding dynamic headroom for punchy lows.

The Dayton Audio SPA500 is a 500W Class-AB subwoofer plate amplifier featuring a patented tracking downconverter power supply for high efficiency, a toroidal transformer for stable power delivery, and a customizable low-frequency parametric EQ. Its advanced soft clip circuitry protects your speakers while enhancing dynamic range, making it a top-tier choice for audiophiles seeking clean, powerful bass performance.

Specifications

ASIN	B0048FHWL8
Best Sellers Rank	#232,194 in Electronics ( See Top 100 in Electronics ) #1,126 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 A
UPC	844632015922
Voltage	5 volts

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