Fostex LM16 manual Connecting sources, Adjusting the input level, Selecting channel source

Connecting sources

• Connecting sources to the input connectors

Each of mixer channels 1 through 16 provides a combo type -- a combined XLR connector and phone jack in one. You can connect a microphone to the XLR connector or connect a line signal to the phone jack. (The phone jack can accept both balanced and unbal- anced signals.)

You can adjust the input gain using the [TRIM] control on each mixer channel strip.

<Note>: When you turn on the phantom power, make sure that the [TRIM] controls on the corresponding mixer channels are set fully left (minimum) or the LM16 is pow- ered off.

Usually phantom power does not damage a dynamic microphone, however, do not con- nect an old ribbon microphone to an input connector to which phantom power is sup- plied.

• Selecting channel source

On each of input channels 15 and 16, the [SOURCE (INPUT/SUB IN)] select switch is provided. When the switch is in the INPUT () position, a signal from the [INPUT] con- nector is selected. When the switch is in the SUB IN ( ) position, a signal from the [SUB IN] jacks (L for channel 15, R for channel 16) is selected (see page 34 for details).

• Phantom power supply setting

48 V phantom power can be supplied to the XLR input connectors. For most of condenser microphones, the phantom power is required.

You can turn on or off phantom power using the [PHANTOM] switches in eight channel groups (1-8 and 9-16) using these switches.

<Memo>: When the [PHANTOM] switch is set to ON, the corresponding [PHANTOM] indi- cator on the control panel is illuminated.

<Note>: When you turn off phantom power, the indicator is not immediately turned off, however, phantom power is immediately turned off.

Adjusting the input level

The [TRIM] control adjust the head amp gain of each input signal. To get the optimum gain, set this control appropriately so that the [PEAK] indicator lights at the maximum in- put level.

By adjusting this control appropriately, the LM16 can accept a signal within -60dBu and -12dBu for an XLR connector is connected, while it can accept a signal within -40dBu and +8dBu when a phone plug is connected.

<Memo>: It is important to set the [TRIM] con- trol appropriately. Otherwise, the signal may be distorted or noisy.

Clipping level

Clipping level

<Note>: The [TRIM] control the gain of the head amplifier with a two-stage pre-amp and there is a point where the gain is switched (at approx. -35 dBu for XLR input, -15 dBu for phone input). At this point, a noise may be generated.