輕量級殺手 – Audio Research Foundation LS28 前級擴大機

weihong

值得愛好者入手的新機種
LS28將為Audio Research近年來推出的新機種中，性價比最高的前級擴大機，設計製造人員與高階機種相同，設計邏輯也是根據新推出的高階系列為藍本，用料相近，降低電路複雜度和使用的元件數量，以更低的價格入市，實為讓喜歡Audio Research而還在”內心掙扎”的發燒友們一個入坑的好機會。

LS28維持了Audio Research一貫的特性，擁有真空管機的潤度、微暖特性兼具充足的解析能力，聲音的優異質地難以忽視。Audio Research更有市面上少見的售後服務，這點是原廠不斷強調的價值，購買高單價產品需要的不只是好產品，還要是願意為20年後負責任的好公司。

weihong

Audio Research LS28 真空管前級擴大機規格
●FREQUENCY RESPONSE: +0-3dB, 0.4Hz to 200kHz at rated output (Balanced, 200k ohms load)
●THD+NOISE: Less than .007% at 2V RMS BAL output.
●NOISE: Less than -100dBv at max volume (103).
●DYNAMIC RANGE: 122dB (AES17).
●CROSSTALK: -105dB
●GAIN: Main output: 18.7dB balanced output. (9.3dB SE output.) Record output: 0dB (Processor input: 0dB balanced out).
●INPUT IMPEDANCE: 100K ohms Balanced, 50K ohms SE. 8 Inputs – 4 balanced, 4 single-ended.
●OUTPUT IMPEDANCE: 600 ohms Balanced, 300 ohms SE Main (2), 20K ohms minimum load and 2000pF maximum capacitance. Outputs (3): 2 Main, 1 Record (XLR and RCA connectors).
●OUTPUT POLARITY: Non-inverting.
●MAXIMUM INPUT: 16V RMS BAL, 8V RMS SE.
●RATED OUTPUTS: 2V RMS (1V RMS SE) 1Hz to 200kHz into 200K ohm balanced load (maximum balanced output capability is 17V RMS at less than 0.5% THD at 1kHz).
●CONTROLS: Rotary volume selector (103 steps) and rotary input selector. Push buttons: Power, Menu, Enter, Mono, Invert, Mute
●POWER SUPPLIES: Electronically regulated low and high voltage supplies. Automatic 45 sec. warm-up/brown-out mute. Line regulation better than .01%.
●TUBE COMPLEMENT: (4) 6H30P dual triode.
●POWER REQUIREMENTS: 105-125VAC 60Hz (200-250VAC 50/60Hz) 130 watts maximum.
●STANDBY: 2W

独孤九剑

撇开风格差异不论，此机素质与912的前级部分相比，哪个更高一些？

weihong

相对来说，还是912的声音更柔润一些，当然了，价格也不在一个级别的。