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 clean power

🔋Patented high-efficiency power supply

🎚️Custom low-frequency parametric EQ

R15490

Duties & taxes included

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Description

🔊 Unleash the bass beast with precision power!

TAILOR YOUR THUMP - Low-frequency parametric EQ lets you sculpt bass tones to fit your unique soundscape perfectly.
EFFICIENCY MEETS MUSCLE - Patented tracking downconverter power supply maximizes energy use, keeping your system cool and green.
TOROIDAL TRANSFORMER TECH - Premium toroidal power supply transformer ensures stable, noise-free power for deep, rich bass.
PURE POWER ZERO DISTORTION - High-power Class-AB output delivers crystal-clear, controlled bass that commands attention.
BUILT TO PROTECT DESIGNED 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 high-efficiency tracking downconverter power supply and a toroidal transformer for stable, clean power delivery. It includes a low-frequency parametric EQ for custom sound shaping and advanced soft clip circuitry to protect your woofers while enhancing dynamic range, making it an ideal upgrade for audiophiles seeking powerful, precise bass performance.

Specifications

ASIN	B0048FHWL8
Best Sellers Rank	#292,689 in Electronics ( See Top 100 in Electronics ) #1,326 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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