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> Autograph Crossover
> The rear horn-loding of this enclosure increases the efficiency of the LF driver section of the dual concentric.
> The front horn loading of the drive unit also assists to increase the efficiency of the LF unit.
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> To obtain increased output from the HF-compression driver (to match the increase output from the LF driver), a modified crossover is required that drives the HF-unit harder.
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> This is acheived through the use of an auto-transformer, making the HF-unit appear to have a lower impedance than it actaully does,which in turn will mean that more power is delivered to it for a given output voltage from the amplifier.
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The use of the standard Monitor Gold crossover in conjunction with the Autograph enclosure will give a subdued treble response. Likewise, the use of Monitor Red or Monitor Silver in this enclosure will require a special crossover to be built for the HF-unit.The Monitor-HPD crossover could be modified from its original design, as it already has the tapped auto-transformer used in the Monitor Gold crossover.