SRM450 ACTIVE SOUND REINFORCEMENT SPEAKER USER’S MANUAL
CAUTION AVIS RISK OF ELECTRIC SHOCK DO NOT OPEN RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER (OR BACK) NO USER-SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED PERSONNEL ATTENTION: POUR EVITER LES RISQUES DE CHOC ELECTRIQUE, NE PAS ENLEVER LE COUVERCLE. AUCUN ENTRETIEN DE PIECES INTERIEURES PAR L'USAGER. CONFIER L'ENTRETIEN AU PERSONNEL QUALIFIE.
Lend Me Your Ears Exposure to extremely high noise levels may cause permanent hearing loss. Individuals vary considerably in susceptibility to noise-induced hearing loss, but nearly everyone will lose some hearing if exposed to sufficiently intense noise for a period of time. The U.S. Government’s Occupational Safety and Health Administration (OSHA) has specified the permissible noise level exposures shown in this chart. Duration Per Day Sound Level dBA, In Hours Slow Response 8 90 6 92 4 95 3 97 2 100 1.
INTRODUCTION Thank you for choosing LOUD Technologies’ Mackie active sound reinforcement speakers. The SRM450 is an active two-way loudspeaker capable of extremely high sound pressure levels, and designed to give you the best performance of any loudspeaker in its class and price range. Our design goal was to build a sound reinforcement speaker with: 1. High precision, high output, and accurate playback. 2. Very wide, smooth dispersion of mid and high frequencies. 3.
The Crossover The Active Advantage The built-in electronic crossover is a 24 dB/octave Linkwitz-Riley design. Although more expensive than other crossover designs, the benefits provided by the Linkwitz-Riley design have been well documented. These benefits include: • Absolutely flat frequency response throughout the bandpass, without the characteristic ripple near the crossover point exhibited by other designs.
HOOKUP DIAGRAMS Quick Start 1. Start with the following settings on the back of the SRM450: Turn the POWER switch off (down). Set the TIMED TURNOFF, CONTOUR, and LOW CUT switches out. WARNING: Turn the LEVEL control down (counterclockwise) before every use. If not, you could be in for a startling surprise, especially if the last time you used it was with a microphone and now you want to connect a linelevel source. 2.
For microphone connections, you can daisy-chain up to two SRM450s using the THRU jacks as shown. Take great care to point any microphones away from the SRM450s, otherwise you may get feedback. Dynamic Microphone DESIGNED BY MACKOIDS IN WOODINVILLE, WA • USA DESIGNED BY MACKOIDS IN WOODINVILLE, WA • USA THRU Output SRM450: USING A MICROPHONE AND THE THRU JACK The SRM450 can be used with a Mackie SWA1501 (or SWA1801) subwoofer to create an incredibly powerful system.
REAR PANEL DESCRIPTION The SRM450 has several connectors, controls, and indicators that you should understand. IEC Socket This is where you connect the supplied AC linecord to provide AC power to the SRM450’s built-in power amplifiers. Plug the linecord into an AC socket properly configured for your particular model. Note: If you happen to lose the AC linecord, replacements are readily available at any office or computer supply store. Always use a three-pin plug with a ground pin.
CONTOUR Pushing in this switch engages a filter that provides 3 dB of boost to the low and high frequencies (below 100 Hz and above 12 kHz). This provides a punchy, crisp sound for most live music applications. You can experiment with this switch by leaving it out for a while, then pushing it in to determine which way sounds best for your application. It is especially useful when listening at lower volumes, as it highlights the bass like a Loudness switch, in addition to boosting the highs.
CONNECTIONS PLACEMENT The SRM450 has a female XLR input that accepts a balanced or unbalanced micor line-level signal. When connecting a balanced signal, be sure it’s wired per AES (Audio Engineering Society) standards: The SRM450 active speakers are designed to sit on the floor, a tabletop, or to fit on a standard tripod speaker stand. They can also be suspended by the rigging points, shown opposite. You can lay the cabinet down on its side and use the SRM450 as a floor monitor.
Here are some other placement tips: • Avoid placing loudspeakers in the corners of a room. This increases the low-frequency output and can cause the sound to be muddy and indistinct. • Avoid placing loudspeakers against a wall. This, too, increases the low frequency output, though not as much as corner placement. However, if you do need to reinforce the low frequencies, this is a good way to do it. • Avoid placing the active speakers directly on a hollow stage floor.
THERMAL CONSIDERATIONS AC POWER CONSIDERATIONS The amplifiers inside the SRM450 are convection cooled by a large heatsink. For efficient cooling, it is important to allow at least six inches of free space behind the SRM450. If you use the SRM450 on its side for stage monitor applications, we highly recommended that you engage the rear panel LOW CUT switch. This will allow more power for useful monitor frequencies, while reducing the possibility of overheating.
Wherever possible, connect all of your equipment to the same electrical circuit. This will help reduce the possibility of a ground loop problem causing an annoying hum in your speakers. Low power components such as tape decks, mixers, effects processors and CD players should be connected to the same outlet as the SRM450s. Use fused power strips as shown in the diagram below. Make sure that the total current draw of your components does not exceed the capability of the outlets and power strips.
SERVICE INFORMATION Warranty Service Details concerning Warranty Service are spelled out on page 19 of this manual. If you think your loudspeaker has a problem, please do everything you can to confirm it before calling for service, including reading through the following troubleshooting section. Doing so might save you from being deprived of your Mackie loudspeaker.
• Make sure there is room behind the rear panel to provide sufficient ventilation to the heatsink. Bad sound! • Is it loud and distorted? Follow the procedures described in the “Quick Start” section to verify that the levels are set properly. • Is the input connector plugged completely into the jack? Be sure all connections are secure. It’s a good idea to periodically clean all electrical connections with a non-lubricating electrical contact cleaner.
REPAIR Service for the SRM450 is available only from one of our authorized domestic service stations or at the factory, located in sunny Woodinville, Washington. Service outside the United States can be obtained through local dealers or distributors. If your SRM450 needs service, please follow these instructions: 1. Review the preceding troubleshooting suggestions. Please. 2. Call Tech Support at 1-800-258-6883, 7 AM to 5 PM PST, to explain the problem in detail.
SRM450 SPECIFICATIONS Line Input Power System Specifications Frequency Response (–3 dB) 55 Hz – 18 kHz Frequency Range (–10 dB) 45 Hz – 20 kHz Directivity Factor; Q (DI) 9.95 (9.
THRU INPUT 1 1 FUSE +15VDC MACKIE SRM450 BLOCK DIAGRAM (#060322SEDF) SIGNAL SENSE 3 2 3 2 LOW AC VOLTS SENSE THERMAL SWITCH LOW CUT TOROIDAL POWER TRANSFORMER POWER SWITCH ON OFF TIMED TURNOFF SIGNAL SENSE SIGNAL LED J15 + LO VDC – + MID VDC – HI-PASS THRESHOLD 176uS 40-120 Hz DELAY + HI VDC – SWEEPING FILTER MUTE POWER LEDS MUTE ON/OFF CONTROL THERMAL LED CONTOUR COMPRESSOR LPF THRESHOLD LO-PASS COMPRESSOR HI-FREQ PEAK DETECTION BASS CONTROL SERVO LOOP LO-FREQ
SRM450 LIMITED WARRANTY Please keep your sales receipt in a safe place. A. LOUD Technologies Inc. warrants all materials, workmanship and proper operation of this Mackie SRM450 for a period of five years from the original date of purchase with the following exception: warranty on all its loudspeaker components including woofers and compression drivers are only warranted for two years.
LOUD Technologies Inc. 16220 Wood-Red Road NE • Woodinville, WA 98072 • USA US and Canada: 800.898.3211 Europe, Asia, Central and South America: 425.487.4333 Middle East and Africa: 31.20.654.4000 Fax: 425.487.4337 • www.mackie.com E-mail: sales@mackie.
