Please excuse my ignorance. is this amp safe to use with 2 x 25w rms 5 1/4" speakers in the front, and 2 x 55w rms 6 3/4" speakers in back?

The amp is pushing about 37 watts to each door speaker in your setup. These folks below don't understand how the wiring of the amp works. It isn't going to push 800 watts to your door speakers unless you wire them to the lowest ohm load the amp supports, and bridge them across the channels. Use it as directed, and you're getting 150 watts total rms to your 4 speakers. That's about 37 watts per speaker.

I have the 4 channel 800-watts version. And im not getting any bass out of ch 1&2, no matter how i wire it. Is it defected, or doing something wrong?

if I'm not mistaken, where you see the HIGH PASS/FULL/LOW PASS, make sure the switch is on LOW PASS. But you can also try this in bridged mode with the switch on Low Pass. I have the 1600 Watt version to this amp and thats how it works, But I use mines on High Pass that basically Kills the Bass to my Mids.Hope this Helps. :)

Is this amp to big for 2 6"9 subs that are 200 watts each ?

If you are only running 2 6x9s and no other speakers. Get a 2 channel amp

Is this a good amp for pa horn speakers?

This a good amp for thse i would go a little higher on the RMS so you can get a full range power on it

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Planet Audio AC800.4 4 Channel Class A/B Car Amplifier - 800 High Output, High/Low Level Inputs, High/Low Pass Crossover, Hook to Subwoofer for Bass

Product ID: 7099257

Details

Brand
Planet Audio
Item dimensions L x W x H
10 x 10 x 2.4
Manufacturer
Planet Audio
Mounting Type
Surface Mount
Voltage
16 volts

⚡800W max power output

🔀Bridgeable 4-channel design

🎚️Variable gain & bass boost control

Description

🎵 Amplify your drive, dominate the soundscape.

COMPACT YET MIGHTY - Sleek 10x10x2.4 inch design fits discreetly under seats, perfect for the modern mobile pro.
FLEXIBLE AUDIO ROUTING - Bridge channels to double power for subs or speakers—unleash your system’s full potential.
TAILOR YOUR SOUNDSCAPE - Variable gain and bass boost let you customize every beat to your vibe.
POWER THAT PACKS A PUNCH - Delivers up to 200W x 4 channels at 2Ω for crystal-clear, room-filling sound.
CLASS A B EFFICIENCY MEETS CLARITY - Balanced amplifier topology ensures powerful output without distortion or noise.

The Planet Audio AC800.4 is a 4-channel Class A/B car amplifier delivering up to 800 watts max power with stable 2Ω operation. It features variable gain and bass boost controls, high/low pass crossovers, and bridgeable channels for flexible audio setups. Compact and efficient, it’s designed for professional-grade sound customization and backed by a 6-year warranty, making it a top choice for millennial drivers seeking powerful, customizable in-car audio.

Specifications

ASIN	B00HG6W1VM
Best Sellers Rank	#294,978 in Electronics ( See Top 100 in Electronics ) #669 in Car Multichannel Amplifiers
Brand Name	Planet Audio
Customer Reviews	4.4 4.4 out of 5 stars (674)
Global Trade Identification Number	00636210104964
Included Components	ANARCHY Full-Range MOSFET Class AB Amp (4 Channels, 800 Watts Max)
Item Dimensions	10 x 10 x 2.4 inches
Item Type Name	Planet Audio AC800.4 4 Channel Car Amplifier - 800 Watts, Full Range, Class A/B, 2-4 Ohm Stable, Mosfet Power Supply, Bridgeable
Item Weight	6.6 pounds
Manufacturer	Planet Audio
Material Type	Metal
Maximum Output Power	800W
Model	AC800.4
Mounting Type	Surface Mount
Number of Channels	4
Number of Items	1
Output Power	800 watts
Package Type Name	box
Part Number	AC800.4
Specification Met	certified frustration-free
UPC	823019876158 636210104964
Unit Count	1 Count
Voltage	16 volts
Warranty Description	Planet Audio provides a Powerful 6 Year Platinum Online Dealer Warranty so long as the purchase is made through Amazon.

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