Q

A way of stating the bandwidth of a filter or equalizer section. An EQ with a Q of .75 is broad and smooth, while a Q of 10 gives a nar- row, pointed response curve. To calculate the value of Q, you must know the center frequency of the EQ section and the frequencies at which the upper and lower skirts fall 3 dB below the level of the center frequency. Q equals the cen- ter frequency divided by the difference between the upper and lower –3 dB frequencies. A peak- ing EQ centered at 10kHz whose –3 dB points are 7.5kHz and 12.5kHz has a Q of 2.

TRS

Acronym for Tip-Ring-Sleeve, a scheme for connecting three conductors through a single plug or jack. 1⁄4" phone plugs and jacks and 1⁄8" mini phone plugs and jacks are commonly wired TRS. Since the plug or jack can carry two signals and a common ground, TRS connectors are often referred to as stereo or balanced plugs or jacks. Another common TRS applica- tion is for insert jacks, used for inserting an external processor into the signal path. In Mackie mixers, the tip is send, ring is return, and sleeve is ground.

RFI

Radio Frequency Interference. High frequency radiation that often results from sparking circuits. This can be manifested in a number of ways in audio systems, but is usually evident as a high-frequency buzz or hash sound.

RMS

An acronym for root mean square, a conven- tional way to measure AC voltage and audio signal voltage. Most AC voltmeters are cali- brated to read RMS volts. Other conventions include average volts, peak volts, and peak-to- peak volts.

shelving

A term used to describe the shape of an equalizer’s frequency response. A shelving equalizer’s response begins to rise (or fall) at some frequency and continues to fall (or rise) until it reaches the shelf frequency, at which point the response curve flattens out and re- mains flat to the limits of audibility. If you were to graph the response, it would look like a shelf. At least, more like a shelf than a hiking boot. The EQ controls on your stereo are usu- ally shelving equalizers. See also peaking and dipping.

TS

Acronym for Tip-Sleeve, a scheme for con- necting two conductors through a single plug or jack. 1⁄4" phone plugs and jacks and 1⁄8" mini phone plugs and jacks are commonly wired TS. Sometimes called mono or unbal- anced plugs or jacks. A 1⁄4" TS phone plug or jack is also called a standard phone plug or jack.

unbalanced

An electrical circuit in which the two legs of the circuit are not balanced with respect to ground. Usually, one leg will be held at ground potential. Unbalanced circuit connections re- quire only two conductors (signal “hot” and ground). Unbalanced audio circuitry is less expensive to build but under certain circum- stances is more susceptible to picking up noise.

unity gain

A circuit or system that has its voltage gain adjusted to be one, or unity. A signal will leave a unity gain circuit at the same level at which it entered. In Mackie mixers, unity gain is achieved by setting all variable controls to the marked “U” setting. Mackie mixers are opti- mized for best headroom and noise figures at unity gain.

stereo

Believe it or not, stereo comes from a Greek word that means solid. We use stereo or stereo- phonic to describe the illusion of a continuous, spacious soundfield that is seemingly spread around the listener by two or more related au- dio signals. In practice, stereo often is taken to simply mean two channels.

sweep EQ

An equalizer that allows you to “sweep” or

continuously vary the affected frequency of one or more sections.

volume

Electrical or sound level in an audio system. Perhaps the only thing that some bands have too much of.

XLR connector

A three-pin connector used in audio for transmitting a balanced signal. Sometimes re- ferred to as a Cannon connector, named for the manufacturer who first popularized the three- pin connector.

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Mackie M1200/M1400 owner manual Trs, Unity gain

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.