Solid State Logic X-Logic Series owner manual LF EQ Maximum Gain, ‘Balance’ Adaptor, B-6

X-Rack Owner’s Manual

LF EQ - Maximum Gain
Adjustment:	1. Set LF Gain to maximum and select LF	. Set the audio oscillator for
	80Hz and adjust LF Frequency to find the maximum level on the audio
	level meter.

	2. Adjust VR14 (LF Q) for +16.5dBu ±0.25dB.
	3.	Reset LF Gain to its centre indent position, de-select LF	and re-check
		the audio level meter for 0dBu.
B.4.2	Output Balance
	Equipment Required:	Calibrated audio oscillator, audio level meter and a ‘balance’ adaptor (see
		below).
	Test Signal:	1kHz sine wave at +24dBu.
	Input and Output:	Oscillator to the Input of the channel being tested, Output to the level
		meter via the ‘balance’ adaptor.
	Unit Setup:	Ensure that all front panel switches are off and all controls are set fully
		anti-clockwise.
	Adjustment:	Connect the test equipment to the each channel in turn and adjust VR15
		(BAL) for minimum level (< 55dBr).
B.4.3	‘Balance’ Adaptor

For the output balance adjustment, a ‘balance’ adaptor such as that illustrated here will be required. This adaptor consists of a pair of close tolerance resistors in an in-line cable and is used to sum together a balanced output in order to correctly adjust the level balance of the measured output; perfect balance should result in complete signal cancellation.

	1		3	–
	0V
		1
From unit	2	5K01**
	+				To measuring 2
under test		1	2	+
	3	5K01**			equipment

–

1 0V

Note 1. Resistor tolerance should ideally be 0.01%

2.Absolute level measured will depend upon the input impedence of the measuring equipment.

Page B-6