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 heavy-duty signal horn!

ECE CERTIFIED QUALITY - Meets stringent European safety standards for trusted performance.
DYNAMIC DUAL TONE SIGNAL - High and low frequency range (335/435Hz) for maximum auditory impact.
POWER PACKED PERFORMANCE - Robust 24V electric operation designed for heavy-duty reliability.
COMMAND ATTENTION INSTANTLY - 113dB(A) sound cuts through any noise, ensuring you're heard loud and clear.
DURABLE BLACK GALVANISED HOUSING - Sleek, corrosion-resistant metal casing built to withstand the elements.

The HELLA 3AM 002 768-821 Signal Horn is a professional-grade, 24V electric horn delivering a powerful 113dB(A) sound with dual high/low tones (335/435Hz). Featuring a durable black galvanised metal housing and ECE certification, this front-positioned horn set ensures reliable, heavy-duty performance for demanding environments.

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Manufacturer	HELLA
Brand	Hella
Model	002768821
Item model number	002768821
Manufacturer part number	002768821
OEM Part Number	002 768-821, 3AM 002 768-821, 56370045, A100-323, S92 SET
Position	Front
Item Weight	490 g

Hella3AM 002 768-821 Signal Horn - HELLA HEAVY DUTY HORN S92 SET - 24V - 113dB(A) - Frequency Range: 335/435Hz - High Tone/Low Tone - Electric - ECE - Housing Colour: Black - Quantity: 2

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