APPENDIX C: Connectors

“XLR” CONNECTORS

Mackie amplifiers use 3-pin female “XLR” connectors on each input, with pin 1 wired to the grounded (earthed) shield, pin 2 wired to the “high” (”hot” or positive polarity) side of the audio signal, and pin 3 wired to the “low” (“cold” or negative polarity) side of the signal (Figure A). All totally above-board and in full

SHIELD 2

HOT

COLD 3 1

SHIELD 1

COLD 3 2

HOT

1SHIELD

3COLD

Balanced mono circuits. When wired as a balanced connector, a 1⁄4" TRS jack or plug is connected tip to signal high (hot), ring to sig- nal low (cold), and sleeve to ground (earth). This is the application used for the inputs to Mackie amplifiers.

1⁄4" TS PHONE PLUGS AND JACKS

“TS” stands for Tip-Sleeve, the two connec- tions available on a “mono” 1⁄4" phone jack or plug (Figure C). TS jacks and plugs are used in many different applications, always unbal- anced. The tip is connected to the audio signal and the sleeve to ground (earth). Some examples:

Unbalanced microphones

Electric guitars and electronic

2

Figure A: XLR Connectors

HOT

instruments

• Unbalanced line-level or speaker-level

connections

accord with the hallowed standards dictated by the AES (Audio Engineering Society).

Use a male “XLR”-type connector, usually found on the nether end of what is called a “mic cable,” to connect to a female XLR jack.

SLEEVE

SLEEVE

TIP

TIP

TIP (HOT)

SLEEVE (SHIELD)

Figure C: TS Plug

1⁄4" TRS PHONE PLUGS AND JACKS

“TRS” stands for Tip-Ring-Sleeve, the three connections available on a “stereo” 1⁄4" or “bal- anced” phone jack or plug (Figure B). TRS jacks and plugs are used in several different applications:

RING SLEEVE

SLEEVE RING TIP

 

TIP

 

RING (COLD)

 

TIP (HOT)

Figure B: 14" TRS Plugs

SLEEVE (SHIELD)

 

Stereo Headphones, stereo microphones and stereo line connections. When wired for stereo, a 1⁄4" TRS jack or plug is connected tip to left, ring to right and sleeve to ground (earth).

Unbalanced Send/Return circuits. When wired as a send/return “Y” connector, a 1⁄4" TRS jack or plug is connected tip to signal send (output from mixer), ring to signal return (input back into mixer), and sleeve to ground (earth).

UNBALANCING A LINE

In most studio, stage, and sound reinforce- ment situations, there is a combination of balanced and unbalanced inputs and outputs on the various pieces of equipment. This usually will not be a problem in making connections.

When connecting a balanced output to an unbalanced input, be sure the signal high (hot) connections are wired to each other, and that the balanced signal low (cold) goes to the ground (earth) connection at the unbalanced input. In most cases, the balanced ground will also be connected to the ground at the unbal- anced input. If there are ground-loop problems, this connection may be left disconnected at the balanced end.

When connecting an unbalanced output to a balanced input, be sure that the signal high (hot) connections are wired to each

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Mackie M1200/M1400 owner manual XLR Connectors, ⁄4 TS Phone Plugs and Jacks, Unbalancing a Line, Instruments, Connections

M1200/M1400 specifications

The Mackie M1200 and M1400 are two prominent power amplifiers that have gained recognition for their reliability, performance, and innovative design in the professional audio field. Engineered for both live sound and studio applications, these amplifiers deliver exceptional sound quality and unmatched power, making them a favorite among audio professionals.

One of the standout features of the M1200 and M1400 is their impressive power output. The M1200 boasts a power output of 1200 watts at 4 ohms, while the M1400 takes it a step further with 1400 watts at 4 ohms. This substantial power allows users to drive a wide range of speakers, making them suitable for various settings, from small clubs to large venues and outdoor events. Furthermore, they excel in providing clean, distortion-free sound even at high volumes.

Both models incorporate Mackie's patented Smart Protect DSP technology. This intelligent thermal and signal protection system helps prevent overheating and ensures that the amplifiers operate within safe limits, enhancing longevity and reliability. The DSP also contributes to superior sound quality, maintaining clarity and detail across different frequency ranges.

Another key feature of the M1200 and M1400 is their rugged construction. Designed for the rigors of touring and live performances, these amplifiers feature a sturdy chassis that withstands the challenges of transport and heavy use. Their efficient heatsink design allows for effective cooling, ensuring the amplifiers remain operational even under demanding conditions.

In terms of connectivity, both models are versatile. They offer XLR and TRS inputs, allowing compatibility with a variety of audio sources. The outputs include Neutrik Speakon connections, providing secure and reliable speaker connections. Additionally, the amplifiers have built-in limiters that help to prevent speaker damage by controlling signal levels.

The user-friendly interface of the M1200 and M1400 includes level control knobs, LED indicators for power and signal, and a comprehensive set of output options. This simplicity ensures that audio engineers can quickly adjust settings to cater to specific acoustic environments, making setup and operation seamless.

In conclusion, the Mackie M1200 and M1400 power amplifiers are remarkable for their powerful performance, durability, and advanced technology. Whether for live sound reinforcement or studio applications, these amplifiers continue to set a standard in audio excellence, proving their worth to sound engineers worldwide.