{"product_id":"audio-research-ls28se-line-stage-preamplifier","title":"Audio Research LS28SE Line-Stage Preamplifier","description":"\u003cp\u003eThe LS28SE is a high-end preamplifier that combines technical excellence with an emotional, lifelike connection to music. Drawing from innovations in Audio Research’s Reference 160-series amplifiers, it features upgraded components that enhance clarity, resolution, dynamics, and spatial detail. Its natural balance and smooth, relaxed sound encourage long listening sessions. Often overlooked in audio systems, the preamplifier plays a critical role, and the LS28SE elevates performance with organic tone and refined detail. It brings new vitality and realism to systems, unlocking musical nuances that lesser preamps fail to reveal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFrequency Response:\u003c\/strong\u003e +0-3dB, 0.4Hz to 200kHz at rated output\u003cbr\u003e(Balanced, 200k ohms load)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTHD+Noise: \u003c\/strong\u003eLess than .007% at 2V RMS BAL output\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNoise:\u003c\/strong\u003e Less than -100dBv at max volume (103)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDynamic Range:\u003c\/strong\u003e 122dB (AES17)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCrosstalk:\u003c\/strong\u003e -105dB\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGain: \u003c\/strong\u003eMain output: 18.5dB balanced output.\u003cbr\u003e(12.5dB SE output.)  Record output: 0dB (Processor input: 0dB balanced out).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInput Impedance: \u003c\/strong\u003e100K ohms Balanced, 50K ohms SE.\u003cbr\u003e8 Inputs – 4 balanced, 4 single-ended.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOutput Impedance:\u003c\/strong\u003e 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).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOutput Polarity:\u003c\/strong\u003e Non-inverting\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMaximum Input:\u003c\/strong\u003e 16V RMS BAL, 8V RMS SE\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRated Outputs: \u003c\/strong\u003e2V RMS (1V RMS SE) into 200K ohm balanced load (maximum balanced output capability is 17V RMS at less than 0.5% THD at 1kHz).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eControls:\u003c\/strong\u003e Rotary volume selector (103 steps) and rotary input selector. Push buttons: Power, Menu, Enter, Mono, Invert, Mute.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePower Supplies:\u003c\/strong\u003e Electronically regulated low and high voltage supplies.  Automatic 45 sec. warm-up\/brown-out mute.  Line regulation better than .01%.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTube Compliment:\u003c\/strong\u003e (4) 6H30P dual triode\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePower Requirements:\u003c\/strong\u003e 105-125VAC 60Hz (200-250VAC 50\/60Hz) 130 watts maximum\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eStandby\u003c\/span\u003e: \u003c\/strong\u003e2W\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDimensions:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWidth:\u003c\/strong\u003e 19” (48 cm) \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHeight: \u003c\/strong\u003e6.5” (13.7 cm) \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDepth:\u003c\/strong\u003e 13.7” (34.8 cm)\u003c\/p\u003e\n\u003cp\u003eHandles extend 1.6” (4 cm) forward of the front panel\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWeight: \u003c\/strong\u003e  16.0 lbs. (7.2 kg) Net; 24 lbs. (10.9 kg) Shipping\u003c\/p\u003e","brand":"Audio Research","offers":[{"title":"Silver","offer_id":51502250033440,"sku":null,"price":12000.0,"currency_code":"USD","in_stock":true},{"title":"Black","offer_id":51502250066208,"sku":null,"price":12000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0994\/3728\/1568\/files\/Audio_Research_LS28SE_front_edit.jpg?v=1778016920","url":"https:\/\/salon1audio.com\/products\/audio-research-ls28se-line-stage-preamplifier","provider":"Salon 1 Audio","version":"1.0","type":"link"}