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 power-packed disc horn!

BUILT TO LAST - Crafted by HELLA, a century-strong automotive tech leader, guaranteeing durability and premium quality.
SAFETY MEETS STYLE - Not just a horn—it's your ultimate safety companion with a price-performance ratio that’s hard to beat.
SLEEK MACHINED EXTERIOR - Modern black finish adds a subtle yet bold statement to your vehicle’s front profile.
PLUG PLAY UNIVERSAL FIT - 12V voltage and M8 screw bracket with flat 6.3 mm blade connectors make installation seamless on most vehicles.
COMMAND ATTENTION INSTANTLY - 113 dB(A) high tone at 435 Hz cuts through any noise, ensuring you're heard loud and clear.

The HELLA 012588071 Black 92mm 12V Disc Horn delivers a sharp 113 dB(A) sound at 435 Hz, designed for universal 12V vehicle compatibility. Featuring a durable machined black exterior and easy M8 screw bracket installation, this horn combines premium quality with reliable performance from a global automotive leader with over 100 years of expertise.

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Manufacturer	HELLA
Brand	Hella
Model	012588071
Product Dimensions	16.89 x 15.01 x 6.1 cm; 290 g
Item model number	012588071
Exterior	Machined
Manufacturer Part Number	012588071
OEM Part Number	012 588-071, 012588071, 3AL 012 588-071, S92
Position	Front
Voltage	12 Volts
Item Weight	290 g

Hella012588071 Black 92mm 12V Disc Horn (Ht Universal Fit-Single Blister Pack)

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