Sound Performance Lab 9737 manual Output Gain, LC-display, LED chains

Control Elements

Output Gain

Compensating a level and/or loudness increase due to processing

High Tape Speed

Gaining a finer high frequency resolution when selecting HIGH TAPE SPEED.

LC-display

5	OUTPUT GAIN varies the output level of the digital data stream.
	It is variable between -12dB and +12dB in 0.1dB steps.

The adjusted OUTPUT GAIN value is shown in the LC-display (see 7) and in the OUTPUT PPM meter (see 8).

In practice you will start with the OUTPUT GAIN set to 0dB. In case you have used high DRIVE values you will use the OUTPUT GAIN to compensate for the slight level increase.

You can also use the OUTPUT GAIN control to compensate for the loudness difference between unprocessed and processed signal to judge upon the sonic effect alone. After you have reduced the OUTPUT GAIN until original and processed signal have the same loudness you can readout the loudness increase on the OUTPUT PPM meters compared to the INPUT PPM meters.

Also, if you have chosen a positve setting on the HF-ADJUSTcontrol, it may be necessary to reduce the OUTPUT GAIN slightly in order to prevent clipping. Watch the CLIP-LEDS!

You will set a positive OUTPUT GAIN, when there is still headroom left after processing. Always check this on the loudest part of the audio file being processed and watch the CLIP-LEDs.

With the HIGH TAPE SPEED switch you can change the speed of 6 the vitual tape from standard tape speed (15ips) to high tape

speed (30ips).

When HIGH TAPE SPEED is activated the algorithm simulates the pre-emphasis for high speed recording. The upper mid and high frequencies as well as the harmonical content gain better resolution and finer detail.

Note that the 40Hz to 70Hz bass-reduction induced when recording to analog tape at 30ips is not reproduced!

7	The LC-display shows all encoder settings and the number of
	the preset being used in the last session with the MACHINE HEAD
	(for details on PRESETS refer to 9).

More information is displayed when activating the INFO pages (see 10). Press STORE and APPLY for 1 sec. to enter the INFO pages.

LED chains	8	The INPUT and OUTPUT LED chains are PPM (peak level) meters
		with signal and clip indicators. The metering offers 1dB resol-

tion for the last 3dB before 0dB.

The INPUT PPM meters show the peak level after the INPUT

GAIN control (see 2).

10 Machine Head