Harman kardon ma 362 service manual
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Page 1
MA- 362 Audioaccess ® Twelve Channel Amplifier www.audioaccess.com The Audioaccess MA-362 Twelve Channel Amplifier represents a high value approach while providing twelve channels of clean amplifier power for multi-room system applications. Power to Spare With a power rating of 50 Watts per channel at 8 Ohms from 20Hz to 20kHz with less than .05% THD, the MA-362 will drive virtually any in-wall loudspeaker to room filling volume. Power into 4 Ohms is even more impressive at 75 Watts per channel. All channels may be bridged if additional power is required. Cool operation is ensured with a design incorporating heat sinks, flow through ventilation and low-noise fans. After a series of careful evaluations and tests, Madrigal has chosen to imple- ment a conservative and proven design philosophy with the MA-362 with the added benefit of improved sound quality and long component life. Power for each channel is delivered by a pair of high current output transistors capable of delivering over 200 watts, much higher power than the rated 50 watts per chan- nel. For example, the output transistors for each channel can handle up to 12 amps. At rated power, the MA-362 is drawing only about 3 amps of current per channel, ensuring its reliable performance. Control Capabilities Each pair of channels is controlled by a Trigger Source Selector, a three-position switch that selects signal sensing, voltage trigger input or link (to the trigger signal of the zone to the immediate left) as the source for muting control within each individual zone. A two position Signal Link Selector, is also provided and is used to link a zone to the Signal Input connector of the zone to its left. Installation Flexibility Ease of installation, a hallmark of all Audioaccess products is maintained in the new MA-362. An external speaker termi- nation board can be ordered in advance to allow the installing dealer to pre-wire all of the loudspeakers in the system before the amplifier is delivered for final installa- tion. Final hook up consists of plugging the speaker termination board into a slot in the rear panel of the amplifier. Summary The MA-362 features, performance and reliability make it the perfect amplifier choice for a wide variety of multi-room audio system applications. Simply Ingenious
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A Harman International Company Audioaccess ® Madrigal Audio Laboratories, Inc. P.O.Box 781 Middletown, CT 06457-0781 Internet: www.madrigal.com Fax: 860.346.1540 ©2002 Madrigal Audio Laboratories, Inc. 20202AA – SS/MA-362 Specifications Rack mountable chassis Discrete amplifier design for improved sound quality Signal Input Connector: six dual RCA jacks, one per two channel Four position switch to select Stereo, Bridged Right, Bridged Left, or mono operation for each zoneIndependent level controls for each amp channel Trigger Input, euro-style connector, accepts 3 to 24V AC or DC, to unmute amp channels in the zone Trigger Source Selector: three position switch to select signal sensing, voltage trigger input or link (to the trigger signal of the zone to the immediate left) to control muting in the zone.Plug-in Speaker Termination Board, a snap for advance installations (available separately, not included with the amplifier) Signal Link Selector: two position switch to link a zone to the signal input connector of the zone to its left (excluding zone 1) Power Switch on Front panel Bi-color LED Power Indicator Features Number of Channels: 12, configured as 6 left/right pairs (zones) Power Output (Unbridged): 50W @ 8Ω, 75W @ 4Ω, 20 - 20k Hz, All Channels Driven Power Output (Bridged): 150W @ 8Ω, 20 - 20k Hz, All Channels Driven THD+Noise: <0.05%, at rated power, 20 - 20k Hz IMD: <0.05% (SMPTE) Frequency Response: 20 - 20k Hz, +0/-0.2 dB, at rated power, 4Ωload Bandwidth: 5 – 75k Hz. +0, -3dB, at rated power, 4ΩloadS/N: >100dB unweighted (ref: Rated Power), unbridged into 8Ω Crosstalk: <-70 dB (ref: Maximum Output) between any two channels (no audible crosstalk) Protection: Short Circuit, Over Current, DC, Thermal Muting: Turn on, Turn off, Signal Sensing, and Triggered per zone Input impedance: 24kΩ Input Sensitivity: 1.0 Vrms (with input trim at minimum attenuation) Input Level Trim Range: 20dB Gain: 26dBDimensions and weight: Height: 7" (178 mm) (4 rack spaces, not including feet) Width front panel: 19" (483 mm), Width chassis: 17 11⁄16" (450 mm) Depth: 17 11⁄16" (450 mm) Weight: 60 lb (27.2 kg) (without carton) Features, specifications and dimensions are subject to change. Audioaccess TI-501 Speaker Termination Board (Sold separately)