Mackie M1400/M1400i Owner's Manual - Page 3

Lend Me Your Ears Exposure to extremely high noise levels may cause per- manent hearing loss. Individuals vary considerably in susceptibility to noise-induced hearing loss, but nearly everyone will lose some hearing if exposed to suffi- ciently Duration Per Day Sound Level dBA, intense In Hours Slow Response noise for a 8 90 period of 6 92 time. The 4 3 95 97 U.S. 2 100 Government's 1.5 102 Occupa- 1 105 tional 0.5 110 Safety and 0.25 or less 115 Health Ad- ministration (OSHA) has specified the permissible noise level exposures shown in this chart. According to OSHA, any exposure in excess of these permissible limits could result in some hear- ing loss. To ensure against potentially dangerous exposure to high sound pressure levels, it is recom- mended that all persons exposed to equipment capable of producing high sound pressure levels (such as this amplification system) use hearing protectors Typical while this Example unit is in Duo in small club operation. Subway Train Ear plugs or protec- Very loud classical music tors in the ear canals Lori screaming at Ron about deadlines or over the Loudest parts at a rock concert ears must be worn when oper- ating this amplification system in order to prevent a permanent hearing loss if exposure is in excess of the limits set forth here. INTRODUCTION Thank you for choosing a Mackie Designs power amplifier! We appreciate your vote of confidence for the folks in Woodinville who specialize in awesome and affordable audio. The Mackie Designs M•1400 and M•1400i Power Amplifiers are designed to fulfill the amplification needs of almost any type of application. They boast a wealth of features you'd expect to pay extra for - like subwoofer filtering, constant directivity equalization, speaker-protecting limiter, and gobs of ultra-clean power, to name a few. Perhaps the most important feature of the FR Series™ Power Amplifiers is the attention to detail in every aspect of the design. At Mackie, we know what it takes to be roadworthy. After all, our mixers have traveled all over the world under the worst of conditions, and we've applied what we've learned to the mechanical design of our amplifiers. Roadworthiness is only part of the picture. We know that reliability is paramount to sound reinforcement. That's why we use double-sided thru-hole-plated fiberglass printed circuit boards. That's why our engineers have subjected the amplifier to the most rigorous and punishing tests imaginable, to fine-tune the design and extend its limits beyond those of ordinary amplifiers. Fast Recovery - where the "FR" comes from - is more than a buzzword. It is based on real, proven design principles. The result is an amplifier that performs better than conventional designs when presented with adverse conditions. One of the most difficult things for a power amplifier to handle is clipping. Conventional designs use lots of negative feedback to provide stability and lower distortion. When clipping occurs, this "feedback" causes high-frequency sticking, keeping the amplifier "latched" in the clipping state longer than necessary. This results in painfully audible distortion. Our Fast Recovery design eliminates this high-frequency sticking and allows the amplifier to remain stable when powering highly reactive loads at high volume levels. You may wonder why a power amp even needs an owner's manual. After all, you just plug in a few cables and power it up. Well, it's almost that simple. There's just a few things that we'd like you to be aware of, and we'll discuss those right away - please see the Quick Start on the next page. Then go ahead and read the entire manual. The M•1400/M•1400i amplifiers have a wealth of useful features, and each of them is explained in detail. Note: The only difference between the M•1400 and M•1400i are the speaker output connectors: in addition to the binding posts, the M•1400 has Speakon® connectors while the M•1400i has 1/4" TS jacks. Please write your serial number here for future reference (i.e., insurance claims, tech support, return authorization, etc.): Purchased at: Date of purchase: ® Part No. 0000999 Rev. A 12/2001 3 ©2001 Mackie Designs, All Rights Reserved.