Tannoy 6D 66D & 8D manual Guide to Setting the Equalisation

Hi-Mid Shelf Boost/Cut: a shelving filter between 1kHz and 3KHz can be set to +2, +1dB, flat, -1dB, -2dB, to take account of room characteristics and personal preference. Editing news broadcast material is often easier with an increased output in this band. Figure 6 shows the range of adjustment in this area controlled by DIP switches 11 to 14.

Diagramatic View of EQ Dip Switches: Upper Midband Filter Settings

20 way DIP Switch Bank (4+4+2+4+6) LF EQ Low Mids Hz Up Mid Highs

5.0: A GUIDE TO SETTING THE EQUALISATION

Assess the monitoring conditions and consider these 4 main factors:

1.The environment: free space (4pi), half space (2pi), quarter space (pi) and in the extreme, a "Difficult Space" (pi/2)

2.The distance from the speakers: far field (2 to 3m), mid field (1 to 2m), near field (0.5 to1m) or close field (less than 0.5m)

3.The room: absorbent or reflective surfaces, estimate the RT 60 decay time above 1kHz

4.The nature of the source material: prolonged sessions working on editing bright or forward material can produce fatigue.

+10dB

0dB re 2.8v

@1 metre

-10dB

1 1 1 0

1 1 1 0

1 1 1 0

1 1 1 0

0 0 1 1 0 0

0 0 0 1 0 0

0 0 0 0 0 0

1 1 1 0 1 1 1 0 0 0 0 0 0 0

0 0 0 0 0 0

1 1 1 0	1 1 1 0	0 0	0 0 1 0
1 1 1 0	1 1 1 0	0 0	0 0 1 1

0 0 0 0 0 0

0 0 0 0 0 0

0 0 0 0 0 0

Free Space (4Pi): An example of free space conditions would be with the speakers mounted on tall (0.5m to 1.2m) speaker stands well away from the wall at one end of a room and with the listener 2 to 3 meters away. Under these conditions set all the DIP switches to the 'flat anechoic' position. This then provides a high quality high fidelity installation operating in good acoustically treated environments.

1 1 1 0	1 1 1 0	0 0	0 0 0 0	0 0 0 0 0 0
+10dB
0dB re 2.8v
@ 1 metre
-10dB

10Hz 20Hz 50Hz 100Hz 200Hz 500Hz 1Khz 2kHz 5kHz 10kHz 20kHz

Fig. 6. Range of EQ available for DIP switches 11 to 14. All other DIPs set to 'Flat'.

High Frequency Shelf Boost/Cut: a shelving filter between 5kHz and 50kHz can be set to +3dB, +2dB; +1dB, flat anechoic, -1dB, -2dB, -3dB to take account of RT60 decay times for the environment within this band and to allow a degree of personal preference. Figure 7 shows the range available diagramatically.

Diagramatic View of EQ Dip Switches: High Frequency Filter Settings

20 way DIP Switch Bank (4+4+2+4+6) LF EQ Low Mids Hz Up Mid Highs

					1 1 1 0			1 1 1 0	0 0	0 0 0 0	1 1 1 0 0 0
					1 1 1 0		1 1 1 0		0 0	0 0 0 0	0 1 1 0 0 0
+10dB					1 1 1 0	1 1 1 0		0 0	0 0 0 0	0 0 1 0 0 0
			1 1 1 0	1 1 1 0	0 0	0 0 0 0		0 0 0 0 0 0
0dB re 2.8v
@ 1 metre
					1 1 1 0	1 1 1 0		0 0	0 0 0 0	0 0 0 1 0 0
-10dB
					1 1 1 0		1 1 1 0		0 0	0 0 0 0	0 0 0 1 1 0
					1 1 1 0			1 1 1 0	0 0	0 0 0 0	0 0 0 1 1 1
10Hz	20Hz	50Hz	100Hz	200Hz	500Hz	1Khz		2kHz		5kHz	10kHz	20kHz

Fig. 7. The range of upper HF EQ controlled by DIP switches 15 to 20. All other DIPs set to 'Flat'

10Hz 20Hz 50Hz 100Hz 200Hz 500Hz 1Khz 2kHz 5kHz 10kHz 20kHz

Half Space (2Pi): An example of half space would be with speakers against a wall mounted on stands as above, or on the meter bridge with the console in the centre of a room. Follow the DIP settings in the diagram below for half space (Pi/2) and adjust for the listening distance accordingly. Adjust the LF-Q settings to balance the system.

			1 1 1 0	0 1 1 0	0 0	0 0 0 0	0 0 0 0 0 0
+10dB
0dB re 2.8v
@ 1 metre
-10dB
10Hz	20Hz	50Hz	100Hz	200Hz	500Hz	1Khz	2kHz	5kHz	10kHz	20kHz

10 11