Tascam US-144 sound card calibration?

[whoaru99]

Just finished hooking up and trying the soundcard calibration routine for the Tascam US-144 USB interface.

Just want to check that these values seem to be correct and of proper quality.

Sample rate: 48000Hz
-3dB points: 2.6Hz, 22.983kHz
Input device: TASCAM US-144
Input: No input selected
Channel: Right
Input volume: no control
Input RMS target: -15.0dB
Actual RMS at 1kHz: -35.6dB
Output device: TASCAM US-144
Output: No output selected
Sweep level: -15.0dB
20Hz .. 20kHz flatness: +0.0, -0.2dB

Also, how do I interpret the impulse response graph to know whether it's good or not?


Thanks!!

[brucek]

Yep.......

[JohnM]

The input level (-35dB at 1k) looks low. If you post a screenshot of the impulse response I'll point out what is good or bad about it.

[whoaru99]

Here's a capture of the impulse tab.

Also, I reran the cal and the numbers were basically the same, except that this time the 1kHz level says
target = -15dB, and actual = -14.7dB.

[JohnM]

Level sounds fine on the rerun. On your impulse reponse, all looks fine. An ideal response would just be a single spike. Your response is very clean (noise floor about -110dB relative to the peak), with slight 2nd, 3rd and higher harmonic distortions (those are the small spikes ahead of the main spike). You are good to go.

[whoaru99]

Great!! Thanks!