Our Take The SR1a by RAAL-requisite is the world’s first Earfield™ headphone monitor. Experience mixing, mastering, and home listening with unparalleled accuracy and realism in a soundfield devoid of room acoustics and comb-filtering caused by work surface reflections. Earfield™ technology delivers unheard of program accuracy and a speaker-like soundfield experience. True Ribbon™ SR1a. The world's first Earfield™ headphone monitor. Ribbons for a reason. The SR1a is the world’s first True-Ribbon™ headphone. Highly specialized ribbon drivers were developed that reproduce 30Hz to 30kHz bandwidth in order to eliminate the need for sealed chambered bass and allow for open air baffles (both front and back) for a true full-frequency soundfield. SR1a Freedom. Professional engineers report that SR1a Earfield Monitors™ reveal more detail and accuracy than even their finest traditional studio monitors or headphones. Helping to achieve high-quality, transferable mix results in non-traditional environments. The accuracy, musicality and portability of the SR1a frees the engineer to work whenever, and wherever they choose. Incredibly comfortable. Weighing in at only 425 grams (15 ounces). Unlike standard headphones whose weight and heat create listener discomfort over time. The SR1a Earfield™ design eliminates heat buildup on the ears providing a cool, natural airflow. Your ears will also appreciate the complete absence of sound pressure against the eardrums caused by traditional sealed can designs. SR1a headphones can be worn comfortably for many hours at any listening level. Finest materials. Hand built. The SR1a features; carbon fiber baffles, stainless spring steel headband, aluminum ribbon drivers, plush memory foam bars, and lambskin leather (non-leather option available). Every SR1a is expertly handmade, in Serbia, by the skilled European craftspeople who build world-renowned RAAL ribbon tweeters. What's Included • SR1a Earfield Monitors™ • 7' Headphone Y Cable • Custom SR1a Hardcase • Ribbon/Amp Interface & Cables (requires a 100W+ speaker amplifier) or • Schiit Jotunheim R Direct-Drive Amplifier or RAAL HSA-1b Ribbon/HP/Speaker Amp (drives SR1a directly!) RAAL SR1a Headphone - Specs Style Earfield™ open baffle. Floating near ear, does not enclose ears. Impedance 0.2 Ohms with cabling. *Used in series Ribbon/Amplifier Interface. Amplifier Interface *Ribbon/Amplifier Interface. 6 Ohms. Use any loudspeaker amplifier. Amplifier power rating 100W Sensitivity 91 dB/1W Max SPL 111 dB Frequency Range 30Hz - 30KHz Impedance 32 ohms Weight 425 grams * Applies only with RAAL Interface Box. No separate loudspeaker amplifier required with Schiit Jotunheim R DAC/Amp Or HSA-1B package. RAAL HSA-1b Ribbon/HP/Speaker Amp - Specs Load Impedance .03 ohm - infinity Output Power (one channel driven) 10W/8 ohms, 20W/4 ohms, 40W/2 ohms, 55W/1 ohm @ 1khz/sine Ribbon & Headphones Drive RAAL-requisite SR-1a, Dynamic &Planar Magnetic Speaker Drive 8 ohm, 4 ohm, 2 ohm Loads Freq Response 100mv/ in/sin 15hz-500kHz Power Bandwidth 100kHz (-3dB) at 1khz Frequency Range 30Hz - 30KHz Distortion Signal to Noise Ratio < 90dB Input Impedance 40 kOhm Sensitivity < 0,5V/40kOhm Inputs IN1 - RCA pair, IN2 - XLR pair Max Power Consumption 150W, without signal 25W Dimensions h2.54" x W8.58" x D12.6" Weight 11.7 lbs Schiit Jotunheim R - Amplifier Specs Frequency Response 20Hz-20Khz, +/-0.1db, 2Hz-500KHz, -3dB, baffle compensation off into SR1a load Maximum Current / SR1a 13.2A per channel, both channels driven, at clipping (10% THD) THD 0.0005% at 32 ohms, 1V THD at 0.2A output / SR1a 0.014% THD at 1A output / SR1a 0.026% IMD 0.02% at 0.2A output current, 0.04% at 1A output current into SR1a SNR 110dB, referenced to 3A output Crosstalk 65dB, 20 Hz-20KHz, when loaded with SR1a Output Impedance Less than 0.015 ohms Input Impedance 50K ohms Gain 2 (6dB) Inputs Balanced XLR and Single-Ended RCA Outputs Balanced RAAL headphone (4-pin male XLR), balanced & single-ended passive preamp Optional Inputs True Multibit™ DAC Gain Stage Proprietary Schiit Nexus™ fully discrete differential current-feedback topology Power Supply One 48VA transformer with 6 stages of discrete or integrated regulation and over 120,000uF total filter capacitance Protection Hall Effect current sensor for overcurrent conditions, triggering at 31A, plus integrated thermostat triggering at 95 degrees C Schiit Jotunheim R - DAC Specs USB Input Receiver C-Media CM6631A DAC Chip Analog Devices AD5547 Digital Filter Schiit Time- and Frequency-domain Optimized DSP filter Input Capability up to 24/192 Analog Output Fully differential, active summing and filtering Frequency Response 20Hz-20KHz, +/-0.25dB, 2-100kHz, -3dB THD 0.005%, 20Hz-20KHz, full scale IMD 0.006%, CCIR SNR 109dB, referenced to 2V RMS, unweighted Power Consumption 45W max Dimensions 9x6x2” Weight 7 lbs
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