Tascam US-144 sound card calibration?

**whoaru99** · **05-17-08, 11:56 AM**

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** · **05-17-08, 11:58 AM**

Yep.......

**JohnM** · **05-17-08, 12:58 PM**

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** · **05-17-08, 05:01 PM**

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** · **05-17-08, 07:46 PM**

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** · **05-17-08, 09:31 PM**

Great!! Thanks!

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