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.
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.
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.
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.
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.
• SR1a Earfield Monitors™
• 7' Headphone Y Cable
• Custom SR1a Hardcase
• Ribbon/Amp Interface & Cables (requires a 100W+ speaker amplifier)
• Schiit Jotunheim R Direct-Drive Amplifier or RAAL HSA-1b Ribbon/HP/Speaker Amp (drives SR1a directly!)
Earfield™ open baffle. Floating near ear, does not enclose ears.
0.2 Ohms with cabling. *Used in series Ribbon/Amplifier Interface.
*Ribbon/Amplifier Interface. 6 Ohms. Use any loudspeaker amplifier.
Amplifier power rating
30Hz - 30KHz
* Applies only with RAAL Interface Box. No separate loudspeaker amplifier required with Schiit Jotunheim R DAC/Amp Or HSA-1B package.
.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
8 ohm, 4 ohm, 2 ohm Loads
100mv/ in/sin 15hz-500kHz
100kHz (-3dB) at 1khz
30Hz - 30KHz
Signal to Noise Ratio
IN1 - RCA pair, IN2 - XLR pair
Max Power Consumption
150W, without signal 25W
H3.54" x W8.58" x D12.6"
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)
0.0005% at 32 ohms, 1V
THD at 0.2A output / SR1a
THD at 1A output / SR1a
0.02% at 0.2A output current, 0.04% at 1A output current into SR1a
110dB, referenced to 3A output
65dB, 20 Hz-20KHz, when loaded with SR1a
Less than 0.015 ohms
Balanced XLR and Single-Ended RCA
Balanced RAAL headphone (4-pin male XLR), balanced & single-ended passive preamp
True Multibit™ DAC
Proprietary Schiit Nexus™ fully discrete differential current-feedback topology
One 48VA transformer with 6 stages of discrete or integrated regulation and over 120,000uF total filter capacitance
Hall Effect current sensor for overcurrent conditions, triggering at 31A, plus integrated thermostat triggering at 95 degrees C
USB Input Receiver
Analog Devices AD5547
Schiit Time- and Frequency-domain Optimized DSP filter
up to 24/192
Fully differential, active summing and filtering
20Hz-20KHz, +/-0.25dB, 2-100kHz, -3dB
0.005%, 20Hz-20KHz, full scale
109dB, referenced to 2V RMS, unweighted