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从天朗爱好者网站上扒下来一段说明,提示Autograph用家,装金天朗、红天朗、银天朗都需要摩改分频器,加强高音增益。一并感谢欧博老总的提示,下决心装备体量较小的GRF。
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. 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. 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.
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.
Another approach would be to bi-amplify the system, thus making proper calibration between HF and LF easy to obtain. Note that the equalisation circuit from within the original crossover for the HF unit will still be required (ie: all those parts after the auto-transformer). |
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