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RAAL-requisite SR1a Ribbon Headphone

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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)


• Schiit Jotunheim R Direct-Drive Amplifier or RAAL HSA-1b Ribbon/HP/Speaker Amp (drives SR1a directly!)

RAAL SR1a Headphone - Specs

Earfield™ open baffle. Floating near ear, does not enclose ears.

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

91 dB/1W

111 dB

Frequency Range
30Hz - 30KHz

32 ohms

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


Signal to Noise Ratio
< 90dB

Input Impedance
40 kOhm

< 0,5V/40kOhm

IN1 - RCA pair, IN2 - XLR pair

Max Power Consumption
150W, without signal 25W

H3.54" x W8.58" x D12.6"

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)

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

Output Impedance
Less than 0.015 ohms

Input Impedance
50K ohms

2 (6dB)

Balanced XLR and Single-Ended RCA

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

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

0.005%, 20Hz-20KHz, full scale

0.006%, CCIR

109dB, referenced to 2V RMS, unweighted

Power Consumption
45W max


7 lbs


About RAAL-requisite

RAAL-requisite represents two legendary brands in ultra high-end audio, coming together, to create a sound unlike anything the world has ever heard before.