Meyer Sound M'elodie, Operating Instructions Manual

34

APPENDIX C

AUDIO INPUT

Type

Differential, electronically balanced

Max. common mode range

±15 V DC, clamped to earth for voltage transient protection

Connectors

Female XLR input with male XLR loop output or VEAM all-in-one connector (integrates AC, 

audio, and network)

Input impedance

10 k

Ω

 differential between pins 2 and 3

Wiring

Pin 1: Chassis/earth through 220 k

Ω

, 1000 pF, 15 V clamp network to provide virtual 

ground lift at audio frequencies

Pin 2:

Pin 3: Signal -

Case: Earth ground and chassis

DC Blocking

Differential DC blocking up to max common mode voltage

CMRR

>50 dB, typically 80 dB (50 Hz – 500 Hz)

RF filter

Common mode: 425 kHz

Differential mode: 142 kHz

TIM filter

<80 kHz, integral to signal processing 

Nominal input sensitivity

0 dB V (1 V rms, 1.4 V pk) continuous is typically the onset of limiting for noise and music.

Input level

Audio source must be capable of pro20 dBV (10 V rms, 14 V pk) into 600 

Ω

 in 

order to produce maximum peak SPL over the operating bandwidth of the loudspeaker

AMPLIFIERS

Amplifier type

Three-channel complementary MOSFET output stages (class AB/H) 

Output power

1275 W (three channels; 2 x 500 W, 1 x 275 W); 2550 W peak

Note:

 Amplifier wattage rating based on the maximum unclipped burst sine-wave rms 

voltage that the amplifier will produce for at least 0.5 seconds into the nominal load 

impedance: 45 V rms low channels and 47 V rms high channel. Peak power based on 

the maximum unclipped peak voltage that the amplifier will produce for at least 100 

milliseconds into the nominal load impedance: 63 V peak low channels and 67 V peak high 

channel.

THD, IM TIM

< .02%

Load capacity

4 

Ω

 low and mid; 8 

Ω

 high channels

Cooling

Convection cooled

AC POWER

AC power connector

PowerCon with looping output or VEAM 

Voltage selection

Automatic, two ranges, each with high-low voltage tap (uninterrupted)

Safety agency rated 

operating voltage

95 V AC – 125 V AC, 208 V AC - 235 V AC, 50/60 Hz

Turn on/turn off points

85 V AC - 134 V AC; 165 V AC - 264 V AC 

Current Draw

Idle current

.680 A rms (115 V AC), .360 A rms (230 V AC), .760 A rms (100 V AC)

Max. long-term continuous 

current (>10 sec)

2.3 A rms (115 V AC); 1.2 A rms (230 V AC);  2.6 A rms (100 V AC)    

Burst Current (<1 sec)

4 A rms (115 V AC), 2 A rms (230 V AC), 4.5 A rms (100 V AC)

Note: 

AC power cabling must be of sufficient gauge so that under burst current RMS conditions, cable transmission 

losses do not drop voltage below specified operating range at the speaker.
Ultimate Short-Term Peak 

Current  Draw

13 A pk (115 V AC), 6.5 A pk (230 V AC), 15 A pk (100 V AC)

Inrush Current

10 A pk (115 and 100 V AC), 18 A pk (230 V AC)

RMS NETWORK

Equipped with two-conductor twisted-pair network, reporting all operating parameters of 

amplifiers to system operator’s host computer.