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.Customs & duties included in the price

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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 clean power output

🔄patented tracking downconverter

🔊custom low-frequency EQ

€ 983.41

Duties & taxes included

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Sold byAmazon CyprusDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔊 Unleash the bass that commands the room — power, precision, and protection in one sleek amp!

TAILOR YOUR BASS - Low frequency parametric EQ lets you boost or cut frequencies to perfectly match your room and taste.
PROTECT YOUR INVESTMENT - Advanced soft clip circuitry expands headroom and safeguards your subwoofer from damage.
TOROIDAL TRANSFORMER TECH - Premium toroidal power supply ensures stable, noise-free performance for deep, rich lows.
EFFICIENCY MEETS INNOVATION - Patented tracking downconverter power supply maximizes energy use, keeping your system cool and green.
PURE POWER ZERO DISTORTION - High power Class-AB output stage delivers crystal-clear, controlled bass without muddiness.

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