LS28SE

這是一款技術性能卓越的高階前級擴大機，它能將音樂真實而富有感染力的情感傳遞給聽眾，堪稱一件樂器。

LS28SE 汲取了 Audio Research 在打造 Reference 160 系列功率擴大機方面的豐富經驗。眾多昂貴的元件升級顯著提升了 LS28SE 的清晰度、解析力、瞬態響應和空間感。其純淨自然的音色令人耳目一新，並能激發您長時間聆聽的慾望。

靈活的操作

LS28SE 前置放大器操作靈活直覺。四個平衡輸入和四個非平衡輸入，以及兩組平衡輸出和非平衡輸出，提供了豐富的連接選項。輸入命名、電子管使用時間、自動關機和家庭劇院直通功能均可透過選單輕鬆設定。相位反轉和單聲道模式也是標準功能。

一款優秀的前級擴大機對您的音樂系統的影響不容忽視。

揚聲器和功率擴大機對您聽到的聲音固然至關重要，但前級擴大機卻常常被低估。許多音樂瑰寶未能充分展現，是因為大多數前級擴大機無法與它們所處的系統相匹配。 LS28SE 的出現改變了這一切。它自然流暢的音色和豐富的細節，能為原本使用其他前級擴大機的系統帶來即時的活力和精緻感。

TECHNICAL SPECIFICATIONS
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: 18.5dB balanced output.
(12.5dB 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) 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 Compliment

(4) 6H30P dual triode

Power Requirements

105-125VAC 60Hz (200-250VAC 50/60Hz) 130 watts maximum

Standby

2W

Dimensions

Width: 19” (48 cm)

Height: 6.5” (13.7 cm)

Depth: 13.7” (34.8 cm)

Handles extend 1.6” (4 cm) forward of the front panel

Weight: 16.0 lbs. (7.2 kg) Net; 24 lbs. (10.9 kg) Shipping