Will hella 002768821 24v horns to a dc36v/48v battery using a dc24v20a 480w step down transformer be the correct amps and watts for these horns?

Transformers only work with AC not DC. You could use a voltage regulator or a series resistor to reduce the applied voltage to 24V. Or, with 48 volts DC you could just wire them in series so that they each get only 24 volts. The current (amps) will take care of itself (I=V/R), about 5 Amps, I'm told.

Will this fit a 2016 subaru legacy? please only yes or no. no shoulds.

This isn't a yes/no question. It'll fit any car so long as you can find a proper place on the frame to mount them. Mine came with only one high-tone horn. I had to find a place to mount the second. Look at videos of others doing it. You may need to drill, and you'll need to run one wire only as the negative runs through the frame.

why are there two ? can i just install one?

Some vehicles are outfitted with two of these, like my SUV. Yes, you could install just one, but I find myself wondering why you don't just by a single horn?

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HELLA 012588071 Black 92mm 12V Disc Horn (Ht Universal Fit-Single Blister Pack)

HELLA 012588071 Black 92mm 12V Disc Horn (Ht Universal Fit-Single Blister Pack)

Product ID: 27675767

Details

Brand
Hella
Color
Black
Item dimensions L x W x H
6.65 x 5.91 x
Material
Alloy Steel
Voltage
12 Volts

🔊113 dB piercing sound

🔋12V power optimized

⚙️M8 screw bracket fit

€ 57.37

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Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔊 Make your presence impossible to ignore with HELLA’s legendary disc horn!

BUILT TO LAST - Robust machined exterior designed to withstand harsh road conditions and daily wear.
UNIVERSAL FIT EASY MOUNT - Includes M8 screw horn bracket and 6.3 mm blade connectors for seamless installation.
COMMAND ATTENTION INSTANTLY - 113 dB ultra-loud tone cuts through any noise, ensuring you're heard in critical moments.
TRUSTED BY INDUSTRY LEADERS - Original equipment quality trusted by top automotive manufacturers worldwide.
PRECISION GERMAN ENGINEERING - Crafted with over 100 years of HELLA expertise for unmatched durability and reliability.

The HELLA 012588071 Black 92mm 12V Disc Horn delivers a powerful 113 dB sound with precision German engineering. Designed for universal fit with an M8 screw bracket and blade connectors, it guarantees easy installation and long-lasting durability. Trusted globally for over a century, this horn ensures maximum safety and attention on the road with a robust, high-tone acoustic warning system.

Specifications

ASIN	B01EG18WX0
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#163,858 in Automotive ( See Top 100 in Automotive ) #234 in Horns & Accessories
Brand Name	Hella
Color	Black
Compatible with Vehicle Type	Passenger Car
Customer Reviews	4.4 4.4 out of 5 stars (564)
Fit Type	Vehicle Specific Fit
Global Trade Identification Number	04082300618167
Included Components	Horn
Item Dimensions	6.65 x 5.91 x 2.4 inches
Item Type Name	Horn Kit
Item Weight	0.64 Pounds
Manufacturer	HELLA
Manufacturer Part Number	012588071
Manufacturer Warranty Description	Limited 1 Year
Material Type	Alloy Steel, Plastic, Stainless Steel
Model Number	012588071
Noise Level	113 Decibels
OEM Equivalent Part Number	012 588-071, 012588071, 3AL 012 588-071, S92
Style Name	High Tone / 12 V
Unit Count	1.0 Count
Voltage	12 Volts

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