User Manual

Townsend Labs Sphere L22 Precision Microphone System Guide Installation and Configuration

Analog Preamp with Continuous Gain Adjustment

To calibrate the input channels on an analog mic preamp with continuous gain adjustment:

1. Connect the microphone to the preamp as previously described and enable phantom power.

2. Place the mic with the front pointing at your sound source.

3. Create a stereo track in your DAW, and assign your preamp’s output channels as its inputs.

The

1-Front and 2-Rear channels correspond to the front and rear capsules, respectively. When

speaking into the front capsule and monitoring that track, you should hear significantly more level

on the

MIC 1 channel. If that is not the case, swap the inputs on the mic preamp.

4. Set the preamp’s

MIC 1 channel gain to an appropriate level for your intended sound source.

5. Set the CAL/ON switch to the

CAL position (see Figure 2-4) on the mic.

The LEDs flash slowly in calibration mode, and the mic now outputs the same signal on both channels.

Figure 2-4 Sphere mic with CAL/ON switch

6. Click the gear icon under Setup on the lower-left corner of the plug-in (see Figure 2-2).

7. Set the gain of the

MIC 2 channel to match the gain of MIC 1 using the Level Calibration Meter.

If it is not possible to match the levels within 0.1 dB, press the

Auto Cal button on the Setup page

to better match the levels.

8. When finished, set the CAL/ON switch to the ON position on the mic.

The LEDs light solid to indicate it is configured for normal use.

CAL/ON switch