Extron electronic MPX 866 A manual zz Push Esc button twice, zz Push Esc button 19 times

See the table at right to read the volume display.

The input LEDs light sequentially to indicate the approximate volume of the selected output. Volume is defined as a percentage of the input audio signal that is applied to the output. From 0% of volume, the first Esc (>) button push applies 5.5% of the input audio signal and the Input 1 LED begins to blink slowly. From 5.5% on, each Esc (>) push applies 1.5% more of the input audio signal to the output:

zzPush Esc (>) button —

5.5% + 1.5% = 7% volume, indicated by the Input 1 LED continuing to blink slowly.

zzPush Esc (>) button twice —

7% + 1.5% + 1.5% = 10% volume, indicated by the Input 1 LED blinking fast.

zzPush Esc (>) button 19 times —

10% + (19 times 1.5%) = 38.5% volume, indicated by the Input 1 through Input 4 LEDs lit steadily.

When all input LEDs are lit, the audio output is 100% of the audio input level.

Another way to think of the volume level is in terms of the attenuation applied to the output. Attenuation reduction is indicated by the lit or blinking input LEDs: when fewer input LEDs are lit, attenuation is greater (and the volume is decreased).

zzAt minimum volume, all input LEDs are unlit and 76 dB of attenuation is applied to the output. The audio output is effectively muted.

zzThe first step of volume increase causes the Input 1 button to blink slowly. Attenuation is reduced by

13 dB (63 dB of attenuation is applied to the output).

zzThe second step of volume increase reduces the attenuation by an additional 1 dB (62 dB of attenuation is applied to the output).

zzSuccessive steps of volume increase cause consecutive LEDs to blink slowly, blink quickly, and then light steadily.

Audio Output Volume Settings

Output	dB of						Input LED
volume attenuation 1			2	3	4	5	6	7	8	9	10	11	12
0%	76
5.5%	63	S
7%	62
8.5%	61	F
10%	60
11.5%	59
13%	58		S
14.5%	57
16%	56		F
17.5%	55
19%	54
20.5%	53
22%	52			S
23.5%	51
25%	50			F
26.5%	49
28%	48
29.5%	47
31%	46				S
32.5%	45
34%	44				F
35.5%	43
37%	42
38.5%	41
40%	40					S
41.5%	39
43%	38					F
44.5%	37
46%	36
47.5%	35
49%	34						S
50.5%	33
52%	32						F
53.5%	31
55%	30
56.5%	29							S
58%	28
59.5%	27							F
61%	26
62.5%	25
64%	24								S
65.5%	23
67%	22								F
68.5%	21
70%	20
71.5%	19									S
73%	18
74.5%	17									F
76%	16
77.5%	15
79%	14										S
80.5%	13
82%	12										F
83.5%	11
85%	10
86.5%	9											S
86%	8
89.5%	7											F
91%	6
92.5%	5
94%	4												S
95.5%	3
97%	2												F
98.5%	1
100%	0
		1	2	3	4	5	6	7	8	9	10	11	12
= on,	F = blinking fast,				S	= blinking slowly,				= off

zzAt full volume, no attenuation is applied to the output and all input LEDs are lit steadily.

MPX 866 A Media Presentation Matrix Switcher • Operation 45