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M•800
OWNER’S MANUAL
AND WARRANTY REGISTRATION
™
HIGH-CURRENT POWER AMPLIFIER
FULL SYMMETRY DUAL DIFFERENTIAL HIGH CURRENT DESIGN PROFESSIONAL POWER AMPLIFIER
GAIN/dB
CH GAIN/dB CH
SIG OL OL
3v 3v
1 2
18 18 ON
16 20 –3 –3 16 20
2v 2v
14 22 6 6 14 22
– –
12 24 –9 –9 12 24
20 20 OFF
– –
6 26 6 26
CH STATUS
28 28
1v 1&2 1v
SENSITIVITY 1.23v (+4dBu) SENSITIVITY 1.23v (+4dBu)
NORM HOT POWER
(MONO BRIDGE)
CAUTION WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT SERIAL NUMBER MANU
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7. Heat — This Mackie product should be situated away from heat sources such as radiators, or other devices which produce heat. CAUTION AVIS RISK OF ELECTRIC SHOCK 8. Power Sources — This Mackie product should be connected to a DO NOT OPEN power supply only of the type described in these operation RISQUE DE CHOC ELECTRIQUE instructions or as marked on this Mackie product. NE PAS OUVRIR 9. Power Cord Protection — Power supply cords should be routed CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOC
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Lend Me Your Ears Exposure to extremely high According to OSHA, any exposure in excess of these permissible limits could result in some hear- noise levels may cause per- manent hearing loss. ing loss. To ensure against potentially dangerous Individuals vary considerably exposure to high sound pressure levels, it is recom- in susceptibility to noise-induced hearing loss, but mended that all persons exposed to equipment nearly everyone will lose some hearing if exposed capable of producing high so
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QUICK START INSTALLATION 6. Determine which AMP MODE is best You can mount the M•800 for your application: amp in any standard rack system (see page 18), or • STEREO mode (separate left and right place it horizontally on a inputs, separate left and right outputs) is the floor or table. typical setup for amplifying stereo signals. • MONO mode (sometimes called Dual- Note: 4 ohms is the mini- Mono mode — one or two inputs, two mum impedance you mono outputs) is for sending the same should connec
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9. In STEREO and MONO, connect speaker 16. For quieter listening, it is preferable to cables to the SPEAKER OUTPUTS , adjust the amp’s GAIN controls rather either binding post or 1/4" TS: than the source signal’s output level (unless you have the source’s control all • The binding posts are wired the way up!) red = positive (+) and black = negative (–) • The 1/4" TS connectors are wired Things to Remember: tip = positive (+) and sleeve = negative (–) • Never connect the 10. In BRI
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CONTENTS ABOUT THIS MANUAL APPLICATION DIAGRAMS QUICK START ............................................................... 4 APPLICATION DIAGRAMS .............................................. 7 Mackie’s gang of oppressed illustrator droids FEATURE DESCRIPTIONS .............................................. 10 have created easy-to-understand diagrams of GAIN ............................................................. 10 popular studio and live-sound setups. METERS ..........................
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FROM MIXING FROM MIXING CONSOLE CONSOLE LEFT MAIN OUT RIGHT MAIN OUT TYPICAL 35Hz STEREO/TYPICAL TYPICAL 35Hz (MONO BRIDGE) CAUTION WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT SERIAL NUMBER MANUFACTURING DATE 800 WATTS EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. DO NOT REMOVE COVER. 4 OHM LOAD MIN. RISK OF ELECTRIC SHOCK NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL. 120 VAC 60 Hz DO NOT OPEN 400 WATTS CH AVIS: RISQUE DE CHOC ELECTRIQUE — NE PAS OUV
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FROM EXTERNAL CROSSOVER FROM EXTERNAL CROSSOVER LOW PASS OUTPUT LOW PASS OUTPUT TYPICAL 35Hz STEREO/TYPICAL TYPICAL 35Hz (MONO BRIDGE) CAUTION WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT SERIAL NUMBER MANUFACTURING DATE 800 WATTS EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. DO NOT REMOVE COVER. 4 OHM LOAD MIN. RISK OF ELECTRIC SHOCK NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL. 120 VAC 60 Hz DO NOT OPEN 400 WATTS CH AVIS: RISQUE DE CHOC ELECTRIQUE — N
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APPLICATION DIAGRAMS LINE LEVEL OUTPUTS CH 1 CH 2 INPUT GUITAR PREAMPLIFIER/ EFFECTS PROCESSOR WITH STEREO OUTPUTS GOOCH GOOCH TYPICAL 35Hz STEREO/TYPICAL TYPICAL 35Hz CAUTION WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT SERIAL NUMBER MANUFACTURING DATE EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. DO NOT REMOVE COVER. RISK OF ELECTRIC SHOCK NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL. DO NOT OPEN 120 VAC 60 Hz AVIS: RISQUE DE CHOC ELECTRIQUE — NE PAS
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FEATURE DESCRIPTIONS LET’S TWIST A GAIN GAIN/dB These are completely independent volume Here are some more examples of how you 3v controls for each channel. Instead of having an might use the GAIN controls: 18 16 20 2v • When you are in a small room where loud arbitary scale, they are carefully calibrated: 14 22 volume is not required, having the amp gain • The inner ring graphic is labeled in dB, 12 24 controls turned fully clockwise would require though this indicates the amplifier’s voltage
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METERS DO NOT BLOCK THE VENTILATION PORTS. The meters indicate the output level in The amplifier fan draws decibels referenced to the clipping point of the air from the front and out amplifier. through the side panels. The top LED is labeled The amp needs plenty of OL (short for Overload). OL OL fresh air to stay cool. If this comes on, the 3 3 – – The heaviest load the M•800 can tolerate is amplifier will start to dis- 6 6 – – 2 ohms per channel (4 ohms in bridged mode). tort, and the audio si
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POWER CORD The red posts are labeled “+,” which means positive, and the black posts are labeled “–” for The M•800 is supplied with a detachable negative. The amplifier is “common grounded,” power cord. Make sure the power switch is off that is, both black posts are connected inter- before firmly attaching the cord to the ampli- nally to ground. fier. Fit the other end into an AC outlet Use high-quality speaker cable (16 gauge or properly configured for the type of plug on the thicker) to connec
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RING SLEEVE SLEEVE RING TIP If you’re using low imped- ance loads at high power TIP levels, we recommend that RING (COLD) you use the binding post TIP (HOT) SLEEVE (SHIELD) speaker outputs rather 1 Balanced ⁄4" TRS Plug than the 1/4" TS jacks. Al- though 1/4" jacks and plugs are convenient and Unbalanced easy to use, they are not designed to handle Unbalanced TS (Tip-Sleeve) lines can be high-level currents. accommodated via the TRS jack. Make sure Make sure that the amplifier is off before the
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You can use the THRU jack In order to match the output bandwidth with as an input, if necessary, your particular speaker system, the M•800 am- LOW CUT FILTER. The since it’s wired in parallel plifier has a tunable with the other input con- frequencies are clearly marked along the knob’s nectors. travel: You can also use the • Fully counterclockwise, the frequency is be- 1/4" TRS INPUT jacks as THRU jacks. Simply low 10Hz, effectively bypassing the filter. connect the 1/4" TRS INPUT jacks on the
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CONSTANT DIRECTIVITY SWITCH CONSTANT DIRECTIVITY If you don’t have constant directivity horns, HORN EQ /AIR EQ you can leave this switch OFF. Compression drivers mounted on constant- directivity horns require compensation in the 4.5k Hz form of a high-frequency boost, with its “knee” OFF ON set somewhere between 2kHz and 6kHz. Until now, you’d have to resort to external crossovers or worse yet, graphic EQ modules. Both of these are fraught with limitations, not to men- 2k Hz 6k Hz tion adding c
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AMP MODE Some examples of using the BRIDGE mode: • Two M•800s can be used to create a This three-way switch determines what kind powerful stereo system, each driving one of amplifier you want the M•800 to be (or not speaker. to be — what was the question?) • You can use one amp to power a mono The switch alters the input signal routing system, such a center speaker or PA. within the amplifier. Shipped from the factory, it • Multiple M•800s can be used in theater is set to STEREO, correct for ab
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LIMITER As the amplifier output volt- age increases, it will LIMITER ON (TYPICAL). This is the normal eventually run into the inter- configuration with protective limiting. nal DC power supplies and LIMITER OFF is without protective limiting. start to flatten out. The flat The limiter is not designed to alter your tops represent a DC voltage sound — it’s just there to protect your speakers reaching your speakers, which interrupts the from the effects of clipping. Its effect is virtually natural
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GENERAL PRECAUTIONS RACK MOUNTING WARNING: Bypassing the plug’s ground pin can be dan- The M•800 amp requires two rack space gerous. NEVER do it! units (2U = 3.5"). It also requires 16.25" depth inside the rack, including the rear supports. When designing your rack, put the heavier items at the bottom and the lighter items to- The AC current demand of an amplifier var- ward the top. ies depending on several factors, including the Secure the front panel of the amplifier to crest factor and the du
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AC Power Distribution INPUT WIRING The majority of AC outlets Use a high-quality 3-conductor shielded encountered in homes and cable to connect the signal between the signal clubs are served by a 240VAC source (mixing console, equalizer, etc.) and center-tapped service en- the balanced inputs to the amplifier. If you’re trance transformer. This using the unbalanced inputs, use a high-quality provides two phases of AC power on either side 2-conductor shielded cable. Your Mackie of the center tap
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APPENDIX A: Service Information WARRANTY SERVICE Details concerning Warranty Service are • Turn the POWER off, check the speaker spelled out in the Warranty section on page 27. connections and make sure that there are If you think your amplifier has a problem, no strands of wire shorting across the please do everything you can to confirm it be- speaker terminals. fore calling for service, including reading • Is the HOT LED lit? Make sure there is through the following Troubleshooting section. co
