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Rane MA3 - Multi Channel Amplifier

Rane MA3 - Multi Channel Amplifier


 
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Product Code : RANE-MA3
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Description
 
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MA 3 Multi channel Amplifier

The MA 3 is a three-channel amplifier designed to operate reliably in commercial environments. The MA 3 was specifically designed for use with:

  • Paging
  • Foreground Music
  • Background Music Distribution

The MA 3 uses a conventional linear power supply with toroidal transformer. This configuration minimizes the emissions associated with switching supplies and noisier transformer designs. The power supply features independent secondary supplies for each channel, minimizing load regulation interaction and crosstalk.

Thermal management is accomplished with a sealed heat- tunnel design incorporating low velocity forced air and large aperture openings. This design minimizes the noise usually associated with forced air cooling and eliminates the need for an air filter. Forced air cooling allows the amplifier to operate reliably in harsh environments and avoid the buildup of heat in unventilated racks associated with passive convection cooling.

The combination of a solid, conservative power supply and forced-air cooling allows the MA 3 to simultaneously deliver 40 watts of continuous average power into 8 ohms and 60 watts into 4 ohms.

SPiKe* dynamic protection circuitry completely safeguards each channel against over-voltage, under-voltage, overloads, transients from inductive loads, thermal runaway and instantaneous temperature peaks. Biasing is not allowed to occur when an under-voltage condition exists, reducing turn on and turn off transients.

Fast-response limiters allow the MA 3 to tolerate up to 20 dB of overdrive into 8 and 4 ohm loads while holding THD below 1%. This means no loss of speech intelligibility or harsh clipping. This feature greatly increases the dynamic range of the system without external limiters.

Peak-responding, load-adaptive meters accurately indicate the remaining headroom. The meters are helpful in setting system levels and indicating signal compression.

Balanced inputs with Euroblock connectors are provided. Euroblock output connectors accept up to 12 gauge wire. Rear panel Level controls allow amplifier sensitivity adjustment. Internally selectable 80 Hz highpass filters offer protection against over excursion of small bookshelf speakers and saturation of distribution transformers at low frequencies.

Features

Built to be driven hard

The MA 3 Amplifier drives all three channels at the continuous average rated power, indefinitely. It is specifically designed to operate in demanding commercial applications. Very low emissions allow the Amplifier to operate in close proximity to signal processing equipment without causing excessive interference. The CP 52, CP 64 and DA 26 may all operate next to the MA 3 in a rack. The high efficiency "heat tunnel" design allows the Amplifier to process severely compressed signals reliably even when installed in a rack with elevated ambient temperatures. Forced air cooling keeps heat away from other equipment.

You won't hear other Zones

The MA 3 is designed to deliver foreground music, background music and paging signals to three different Zones without annoying crosstalk. A quiet office, for example, with a paging signal only, will not hear foreground music playing in the lounge. The high capacity linear power supply incorporates three independent secondary supplies with independent bridge rectifiers and filters. The result is exceptionally good crosstalk figures even with multiple channels driving full power into 4 ohm loads.

No bad "spikes"

The MA 3 is designed to operate without interruption of signal with as little as 85 VAC available (120 VAC unit). Even if the Amplifier is operating at full power, the signal will not breakup as the AC line voltage drops to 85 VAC. If the AC line drops lower than 85 VAC the signal mutes without "spikes." Once AC power is restored, the signal restarts quickly without "spikes" or signal breakup.

The good "SPiKe"

The power Amplifiers in the MA 3 are protected with National Semiconductors' proprietary SPiKe* protection circuitry. SPiKe protection offers a level of protection not available in conventional amplifiers. It has the ability to instantaneously monitor the temperature of the power device die, yielding a level of reliability not achievable with discrete designs.

It's OK to light the 0 dB Headroom indicator a lot

The high performance Limiter used in the MA 3 means all the available power can be delivered to the load and not simply held in reserve to avoid overload. There is no need to buy up to four times the required power just to prevent occasional system overload. The MA 3 can compress a signal with 9 dB of dynamic power range down to a signal with 3 dB of dynamic power without loss of speech intelligibility or excessive distortion.

With typical amplifiers, when 40 watts is needed to achieve a required average SPL of 80 dB, the contractor must buy an amplifier rated at no less than 160 watts just to maintain 6 dB of headroom. The figure below illustrates the performance of the MA 3 Limiter.

*SPiKe is a registered trademark of National Semiconductor Corporation.

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