News > Ray Samuels Audio SR-71B Fully-Balanced Portable Headphone Amp

   SR-71B เป็นแอมป์พกพาจากค่ายผลิตแอมป์ชื่อเสียงก้องโลก Ray Samuels Audio โดยแอมป์ตัวนี้เป็นแอมป์ชนิด Fully-Balanced ซึ่งก็คือมีชุดวงจรแอมป์จำนวนสองชุดในกล่องเดียวนั่นเอง ซึ่งทางบริษัทได้ระบุว่ามันสามารถใช้ขับหูฟังที่มีขายตามท้องตลาดได้ทุกตัวเลยทีเดียว โดยมีสเปคดังนี้

o Fully-balanced, “quad mono” circuitry. The SR-71B was the first portable amplifier in the world to offer fully balanced circuitry.
o Circuit implemented via extremely high quality balanced output op amps, supported by premium quality resistors, capacitors, etc. The amp features an ALPS volume control.
o Switch selectable single-ended and balanced stereo inputs.
o Switch selectable left and right-channel master gain switches, with settings form low, medium, and high gain.
o This feature lets users adjust the overall sensitivity of the amp to match the sensitivity of their earphones and headphones.
o For example, you might use the “Low” or “Medium” gain settings with high-sensitivity custom-fit in-ear monitors, but the “High” gain setting with very hard-to-drive full-size headphones.
o Single-ended and balanced stereo outputs (implemented, respectively, via a 3.5mm mini-jack and the aforementioned miniature 4-pin balanced connectors). Whenever the amplifier is powered up, both the single-ended and balanced outputs are live. By design the amp provides circuitry that converts single-ended input signals into balanced signals, ensuring that the full benefits of the amplifier circuit are always brought into play.
o Built-in quad Lithium-ion battery packs. The battery packs provide 18V peak-to-peak swings in single-ended mode and 32V peak-to-peak swings in double-ended mode. According to Ray Samuels, the SR-71B’s maximum voltage swing capabilities are roughly twice those of any other fully balanced portable amplifier.
o Wall wart-type battery charger with charging status lights (“red” means “charging”, while “green” means “fully charged.”
o Available in satin black and matte silver finishes.

ซึ่งผู้ผลิตตั้งราคาขายของแอมป์ตัวนี้อยู่ที่ $650USD ครับ


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