First, try DeltaWave software. It is easy to use. If it shows 99.99% or something like that the two files are the same, then look no further - the bass is the same, it's all in your head. But if it shows significant difference... but it won't.

Of course, then you can question if the low cost ADC captured properly...

Do you know what this means? Thanks!

DeltaWave v1.0.61, 2021-02-18T12:19:54.6838371-08:00

Reference: topping_e30_optical_in_e30_minus15.5db_billie_elis_42seconds_right_channel.wav[L] 1852200 samples 44100Hz 16bits, stereo, MD5=00

Comparison: gustard_x16_optical_in_gustard_minus15db_bille_eilish_42seconds_right_channel.wav[L] 1852200 samples 44100Hz 16bits, stereo, MD5=00

Settings:

Gain:True, Remove DC:True

Non-linear Gain EQ:False Non-linear Phase EQ: False

EQ FFT Size:65536, EQ Frequency Cut: 0Hz - 0Hz, EQ Threshold: -160dB

Correct Drift:True, Precision:30, Subsample Align:True

Non-Linear drift Correction:False

Upsample:False, Window:Hann

Spectrum Window:Hann, Spectrum Size:32768

Spectrogram Window:Hann, Spectrogram Size:4096, Spectrogram Steps:2048

Dither:False

Trim Silence:False

Enable Simple Waveform Measurement: False

Discarding Reference: Start=0s, End=0s

Discarding Comparison: Start=0s, End=0s

Initial peak values Reference: -10.999dB Comparison: -11.231dB

Initial RMS values Reference: -25.245dB Comparison: -25.476dB

Null Depth=10.959dB

X-Correlation offset: 798 samples

Drift computation quality, #1: Excellent (1.54μs)

Trimmed 0 samples ( 0.00ms) front, 0 samples ( 0.00ms end)

Final peak values Reference: -10.999dB Comparison: -10.999dB

Final RMS values Reference: -25.243dB Comparison: -25.243dB

Gain= -0.2307dB (0.9738x) DC=0 Phase offset=18.09097ms (797.812 samples)

Difference (rms) = -63.63dB [-66.48dBA]

Correlated Null Depth=63.1dB [57.07dBA]

Clock drift: 0.08 ppm

Files are NOT a bit-perfect match (match=1.82%) at 16 bits

Files match @ 49.9802% when reduced to 10.73 bits

---- Phase difference (full bandwidth): 12.0009273149523°

0-10kHz: 9.14°

0-20kHz: 11.68°

0-24kHz: 12.00°

Timing error (rms jitter): 1.9μs

RMS of the difference of spectra: -109.327530018368dB

DF Metric (step=400ms, overlap=0%):

Median=-42.9dB

Max=-28dB Min=-49.1dB

1% > -49.04dB

10% > -47.25dB

25% > -45.88dB

50% > -42.9dB

75% > -40.61dB

90% > -35.29dB

99% > -10.27dB

PK Metric (step=400ms, overlap=50%):

RMS=-91.5dBFS

Median=-93.5

Max=-84.7

99%: -85.2

75%: -90.71

50%: -93.52

25%: -95.49

1%: -99.37

gn=1.02691066954221, dc=0, dr=7.85006309800256E-08, of=797.8117604836

DONE!

Signature: 0c79b1fb0b0a3302e092eca085067077