I am using the Power Station (PS-2A) to capture high-quality impulse responses and am encountering two distinct acoustic anomalies that compromise the fidelity and flatness of the captured data.
Test Setup
Logarithmic sine sweep, from 20hz to 20000hz, normalized to -2dbfs. DAW track to SSL 12 line out to PS2A line in.
PS2-A to 4x12 16ohms cab. Depth and presence fully counter clockwise.
No clipping observed on SSL12 line out.
PS2 volume around 10 o’clock. Pretty loud but still clean.
I am observing issues at both the low and high extremes of the frequency sweep:
A. Low-Frequency Anomaly (20 Hz)
When the sweep begins at 20hz I should only hear a faint sub-bass rumble (or nothing at all since guitar speakers don’t reproduce frequencies that low). Instead, I hear distinct sound content in the lower mids range.
B. High-Frequency Anomaly (10 kHz and above)
As the sweep moves into the high-frequency range (approximately 10 kHz and above), a distinct, unintended sound artifact appears. This is heard as a whistling or secondary sweeping tone that seems to go up and down in pitch, running in parallel with the main sine sweep until it stops.
Trying to pinpoint where those artifacts are coming from. Currently those artifacts are captured my the mics and skew my impulse response results.
I can provide the sine sweep file used for testing, as well as a phone-captured video of the speaker output showing these artifacts, if they would assist your diagnosis.
Thank you for your time and assistance.!