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)

Product ID: 313193812

Details

Brand
HELLA
Colour
Black
Item dimensions L x W x H
16.9 x 15 x
Material
Horn
Voltage
12 Volts

⚡12V universal power

🔊113 dB piercing sound

🔩M8 screw bracket fit

¥9130

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Description

🚨 Be heard, be safe, be legendary with HELLA’s disc horn!

PLUG PLAY SIMPLICITY - Flat 6.3 mm blade connectors make wiring quick and compatible with most vehicle systems.
UPGRADE YOUR SAFETY GAME - A thicker, punchier sound than OEM horns means you stand out on the road—because your safety deserves the best.
UNIVERSAL FIT ZERO HASSLE - Designed for seamless installation on cars, motorcycles, trucks, and more with a versatile M8 screw bracket.
COMMAND ATTENTION INSTANTLY - 113 dB high tone horn cuts through noise with ease, ensuring you're heard in every critical moment.
BUILT TO LAST TRUSTED WORLDWIDE - HELLA’s century-long legacy guarantees durable, OEM-quality performance you can rely on.

The HELLA 012588071 Black 92mm 12V Disc Horn delivers a powerful 113 dB high tone at 435 Hz, engineered for universal fit across multiple vehicle types. Featuring a robust M8 screw bracket and flat blade connectors, it offers easy installation and reliable, long-lasting performance backed by HELLA’s 100+ years of automotive expertise.

Specifications

ASIN	B01EG18WX0
Automotive Fit Type	Universal Fit
Best Sellers Rank	#33,727 in Automotive ( See Top 100 in Automotive ) #91 in Automotive Horns & Accessories
Brand Name	HELLA
Color	Black
Compatible with Vehicle Type	Passenger Car, Truck, Motorcycle, Bus, Van, etc.
Customer Reviews	4.3 4.3 out of 5 stars (152)
Fit Type	Universal Fit
Global Trade Identification Number	04082300618167
Included Components	Horn
Item Dimensions	16.9 x 15 x 6.1 centimeters
Item Type Name	Horn Kit
Item Weight	290 g
Manufacturer	HELLA
Manufacturer Part Number	012588071
Manufacturer Warranty Description	Limited 1 Year
Material Type	Horn
Model Number	012588071
Noise Level	113 Decibels
Number of Items	1
OEM Equivalent Part Number	012 588-071, 012588071, 3AL 012 588-071, S92
Style Name	High Tone / 12 V
Unit Count	1 Count
Voltage	12 Volts

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¥9130

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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