ALAUDA
DM-500
DESCRIPTION
Class D dual mono power amplifier based on two Hypex NC500 boards. Thanks to this technology the amplifier is ultra-linear, with almost non-existent noise and distortion (even lower than an high quality class A or class AB power amplifier) and can handle the most difficult loads thanks to an ultra-low output impedance. Two Hypex SMPS1200A700 for power supply. Mounting plate + MPAV. New full silver aluminium chassis with CNC silver feet (55mm). There are two version of this amplifier:
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the baseline with the Hypex HxR voltage regulators
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the topline with high performance i/o boards ROUGE NCX2
Balanced and unbalanced inputs gold plated. EMI/RFI filter (Shaffner). WBT 0708cu binding posts or others WBT with or without extracharge.
SPECIFICHE TECHNICHE
- Ouput power: 2x550W(2Ω), 2x700W (4Ω), 2x400W (8Ω)
- Distorsion THD + N: 0,005% (20Hz<f<20kHz, 4Ω. Pout<PR/2)
- Power Bandwidth min. 35Khz
- Frequency Response 0-50Khz (+0/-3dB. All loads.)
- Voltage Gain: 26 db
- Input Impedance: 47KΩ
- SNR 35db
- PSRR 85db
- Output noise 20mV
- CMRR 65db all frequency
- Maximum output current: 28A
- High Line Input Voltage: 190-250Vac
- Low Line Input Voltage: 95-130Vac
CHASSIS: anodized silver aluminium
SIZE: 430x320x99mm
INPUT: XLR + RCA
OUTPUT: 4 x WBT 0708cu
EMI/RFI filter: Shaffner FN280
MODELS
Model HxR. The i/o boards are the Hypex NC converters upgraded with audiophile voltage regulators HPN and HRN (instead of the standard LDO). The buffer stage has the op-amp LM4562. The aluminium frontplate has 2 leds to monitor the status of each channel. The switch button (on/off) is on the rear panel but, on request, you can have on the front plate.
BASIC I/O BOARD HxR
NC500 CONVERTER + HxR
Very neutral i/o board upgraded by replacing the LDO voltage regulators with the Hypex HxRs. In this way, the following improvements are achieved:
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ultra low noise
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higher bandwidth
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excellent CMRR
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low output independent load impedance
Model NCX The top version of Alauda DM-500 has the Rouge NCX2 i/o board. The buffer stage uses OPA1612 operational amplifiers and TI TPS voltage regulators. You can add on dip 8 a discrete op-amp (like SPARKOS or SIL) and HxR voltage regulators, selecting by jumpers the setup preferred. The frontplate of the amplifier has 6 leds with the function of monitoring, for each channel, when the amplifier is on, when it is ready for music playback and when it is clipping. Power button on the rear or front panel.
ROLL OP-AMPS MOVING TWO JUMPERS
The new feautures, which makes NCX2 unique, is that it is nevertheless designed to add a discrete op-amp on DIP8 and the Hypex HxR audiophile voltage regulators.
This "addition", however, does not replace the default setting of the circuit and its basic components (OPA1612 + TI TPS7) since, by moving the appropriate jumpers on the board, the user can always choose and select in any moment the combination (operational-voltage regulator) he prefers:
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OPA1612 with TPS7 voltage regulators,
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OPA1612 with HxR voltage regulators,
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discrete components operational with TPS7 voltage regulators,
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operational components with discrete components with HxR voltage regulators.
NCX2
This amplifier is equipped with the NCX2 i/o board which offers the possibility of adding discrete op-amps and voltage regulators.
The NCX2, in default, always uses the OPA1612 in the buffer stage, perhaps among the best IC's on the market for transparency and clarity of sound (without adding color), whose power is entrusted to the small and fast TI TPS7 voltage regulators ( LDO).
Basically, therefore, the same circuit as the previous NCX.
