Solid State Logic X-Rack E Series LF EQ Maximum Gain, Output Balance, ‘Balance’ Adaptor

Page 8

X-Rack Owner’s Manual

K.4.2

K.4.3

 

4.

Switch BLK in and re-adjust LMF Frequency for maximum level.

 

5.

Adjust VR16 for +18dBu ±0.25dB.

 

6.

Reset LMF Gain to its centre indent position and release the BLK switch.

LF EQ – Maximum Gain

 

Re-check the audio level meter for 0dBu.

1.

Ensure that the BLK switch is released.

Adjustment:

 

2.

Set LF Gain to maximum and select LF BELL. Set the audio oscillator for

 

 

80Hz and adjust LF Frequency to find the maximum level on the audio

 

3.

level meter.

 

Adjust VR17 for +15dBu ±0.25dB.

 

4.

Switch BLK in and re-adjust LF Frequency for maximum level.

 

5.

Adjust VR18 for +18dBu ±0.25dB.

 

6.

Reset LF Gain to its centre indent position, release the BLK switch and de-

Output Balance

 

select LF BELL. Re-check the audio level meter for 0dBu.

 

Calibrated audio oscillator, audio level meter and a ‘balance’ adaptor (see

Equipment Required:

 

Test Signal:

 

below).

 

1kHz sine wave at +24dBu.

Input and Output:

 

Oscillator to the Input of the channel being tested, Output to the level

Unit Setup:

 

meter via the ‘balance’ adaptor.

 

Ensure that all front panel switches are off and all controls are set fully

Adjustment:

 

anti-clockwise.

 

Connect the test equipment to the each channel in turn and adjust VR19

 

 

(BAL) for minimum level (< 55dBr).

‘Balance’ Adaptor

 

0V

1

 

 

 

3

 

 

For the output balance adjustment, a ‘balance’

 

 

 

 

 

 

adaptor such as that illustrated here will be

 

 

 

5K01**

1

 

 

 

 

required. This adaptor consists of a pair of

From unit

+

2

 

 

 

2

 

To measuring

2

 

 

 

 

close tolerance resistors in an in-line cable and

under test

 

3

 

**

1

 

+

 

 

5K01

 

 

is used to sum together a balanced output in

 

 

 

 

 

1

0V

equipment

 

 

 

 

 

 

 

 

 

 

 

 

 

order to correctly adjust the level balance of the

 

 

 

 

 

 

 

 

measured output; perfect balance should result

Note 1.

Resistor tolerance should ideally be 0.01%

 

in complete signal cancellation.

 

 

2.

Absolute level measured will depend upon the input

 

 

 

impedence of the measuring equipment.

 

 

Page K-6

Image 8
Contents Solid State Logic Page Connection Operation‘Brown Knob’ EQ ‘Black Knob’ EQK-2 Performance Specification Measurement ConditionsMeasurement References PerformanceControls HF Band controlsHMF Band controls LMF Band controlsCalibration Information EQ AlignmentHF EQ Maximum Gain HMF EQ Maximum Gain‘Balance’ Adaptor LF EQ Maximum GainOutput Balance Connector Details Audio Input Physical SpecificationEnvironmental Specification Audio OutputK-8