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

PLUG PLAY CONVENIENCE - Includes M8 screw horn bracket and flat 6.3 mm blade connectors for quick setup
COMMAND ATTENTION INSTANTLY - 113 dB noise level ensures you're heard loud and clear in any situation
TRUSTED LEGACY OF EXCELLENCE - From HELLA, a global automotive tech leader with over 100 years of innovation
SEAMLESS UNIVERSAL COMPATIBILITY - Designed for 24V systems with vehicle-specific fit for hassle-free installation
DURABLE PRECISION MACHINED BUILD - Black machined exterior guarantees long-lasting performance and sleek aesthetics

The HELLA 002768821 Black 92mm 24V Disc Horn Kit delivers a powerful 113 dB sound output with a universal 24V fit, engineered for front vehicle mounting. Featuring a durable machined black exterior and easy installation with included M8 screw bracket and blade connectors, this horn combines premium quality and reliability from a century-old automotive leader.

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€ 95.39

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Brand	Hella
Color	Black
Style	High & Low Tone / 24 V
Noise Level	113 dB
OEM Part Number	002 768-821, 3AM 002 768-821, 56370045, A100-323, S92 SET
Automotive Fit Type	Vehicle Specific Fit
Manufacturer	HELLA
Global Trade Identification Number	04082300558906
Model	002768821
Item Weight	1.08 pounds
Item model number	002768821
Is Discontinued By Manufacturer	No
Exterior	Machined
Manufacturer Part Number	002768821
Position	Front

HELLA 002768821 Black 92mm 24V Disc Horn Kit (Universal Fit)

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