Schiit Magni Piety vs Topping A30 Pro

Short answer

More power: the Topping A30 Pro, with 5.50 W into 32 Ω; the Schiit Magni Piety has 1.00 W. Both drive 567 of the 567 non-electrostatic headphones here to 100 dB, so on that test the difference changes nothing.
Hiss with sensitive IEMs: cannot be compared — the maker of the Schiit Magni Piety publishes no noise figure.
Output impedance: 1 headphone is left alone by the Topping A30 Pro under the one-eighth rule but coloured by the Schiit Magni Piety (Symphonium Titan).
Price: the Topping A30 Pro costs $49 more; what that buys on these numbers is set out further down, under What the price difference buys.

Both are desktop amplifiers, $200 against $249.

On raw power they are level: each reaches 100 dB on 567 of the 567 non-electrostatic models here.

Every published figure, next to each other

Specification	Schiit Magni Piety	Topping A30 Pro
Power into 32Ω	1.0 W	5.5 W
Power into 150Ω	446 mW	1.4 W
Power into 300Ω	400 mW	840 mW
Power into 600Ω	200 mW	420 mW
Output impedance	0.6 Ω	0.1 Ω
Output noise	not published	0.3 µV
Price	$200	$249
Headphones it reaches 100 dB on out of 567	567	567

Not published means the maker leaves it out, so that axis cannot be compared.

Where each power figure comes from

Load	Schiit Magni Piety	Topping A30 Pro
32 Ω	Published	Published
150 Ω	Derived	Derived
300 Ω	Published	Published
600 Ω	Published	Derived

Both makers publish a power rating. Schiit Magni Piety publishes at 32 Ω, at 300 Ω and at 600 Ω; Topping A30 Pro at 32 Ω and at 300 Ω. The other rows are worked out from those.

So the two columns are not equally firm row by row: at 600 Ω only the Schiit Magni Piety figure is the maker’s own. On those rows the derived number is the one to doubt first.

What the labels mean.

The headphones that tell them apart

On power they are interchangeable across this whole database: there is no headphone here that one reaches 100 dB on and the other does not.

1 headphone is left alone by the Topping A30 Pro under the one-eighth rule but coloured by the Schiit Magni Piety (Symphonium Titan).

567 of the 567 models here reach 100 dB on both.

Headroom and hiss on 8 models, both sources

Headroom is at a 100 dB SPL peak.

The widest gap on the list is the HiFiMAN HE400se: Topping A30 Pro has +28 dB of headroom there against +21 dB. 7 dB is about 5.3 times the power, which matters for peaks rather than for how loud the music sits.

The hiss columns are empty for Schiit Magni Piety because that maker publishes no output noise figure.

Headphone	Impedance	Needs	Schiit Magni Piety headroom	Topping A30 Pro headroom	Schiit Magni Piety hiss	Topping A30 Pro hiss
Shure SE846	9 Ω	0.04 mW	+42 dB	+49 dB	not published	4 dB
Campfire Audio Andromeda 2020	9 Ω	4.0 mW	+22 dB	+29 dB	not published	-16 dB
Audeze LCD-2 Classic	70 Ω	0.79 mW	+29 dB	+35 dB	not published	-18 dB
Beyerdynamic DT 1990 Pro (250Ω)	250 Ω	0.63 mW	+28 dB	+32 dB	not published	-22 dB
HiFiMAN HE400se	25 Ω	7.9 mW	+21 dB	+28 dB	not published	-23 dB
Audio-Technica ATH-R70X	470 Ω	1.6 mW	+22 dB	+25 dB	not published	-29 dB
Sennheiser HD 600	300 Ω	6.6 mW	+18 dB	+21 dB	not published	-33 dB
HiFiMAN Susvara	60 Ω	50 mW	+11 dB	+18 dB	not published	-35 dB

The gap in dollars, against the gap in numbers

The Topping A30 Pro costs $49 more than the Schiit Magni Piety. Out of the 567 models here, that difference buys 1 more model left alone under the one-eighth rule.

Nothing runs the other way: there is no axis here on which the cheaper of the two does better.

Only published figures count here; blank axes are counted separately.