RAAL-requisite at Audio46

RAAL-requisite SR1a True Ribbon Headphone with Jotunheim R

Product SKU: SR1a (C), Jotunheim R, Internal DAC, Case


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Product Details

(Specifications and appearance of this product are subject to change without notice)
↓ Details provided by RAAL-requisite

The World’s First Earfield Headphone Monitor.

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 Ribbons
For a Reason.

The SR1a is also, 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.


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 appreciate the complete absence of sound pressure against the eardrums caused by traditional sealed can designs. SR1a headphones can be worn comfortably for hours at any listening level.

Fine materials.
Hand built.

The SR1a features; carbon fiber baffles, stainless spring steel headband, aluminum ribbon drivers, plush memory foam bars, and lambskin leather. Every SR1a is expertly handmade, in Serbia, by the skilled European craftspeople who build world-renound RAAL ribbon tweeters.

Jotunheim R
Headphone Amplification.

Want to ditch the speaker amp and interface box for something smaller and simpler? Do you want a true one-box solution you can carry with you wherever you go? Then you want Jotunheim R—direct-drive ribbon headphone amplifier.

This amp was developed for one kind of headphones only: the RAAL-requisite ribbon headphones. Delivering up to 13A (amps…yes, amps) per channel into RAAL’s extremely low impedance load, and including the baffle compensation needed for the SR1a. It means you can leave your speaker amp behind, forget the RAAL-requisite interface box, and, if you buy it with the optional True MultibitTM DAC, you have a one-box system that’s easily transportable.

With DAC. Without DAC.
Get Jotunheim R as “just an amp,” or add an internal DAC to tailor the system to your needs. If you already have a DAC, or don’t need one, choose Jotunheim R without a DAC module for $799. Choose the optional DAC Module to get unique digital filtering and multibit DAC architecture, for $200 more.

In the Box

Version "B":

  • SR1a Headphone
  • Headphone Cable
  • Jotunheim R (no internal DAC)
  • Professional Hard Case

Version "C":

  • SR1a Headphone
  • Headphone Cable
  • Jotunheim R (with internal DAC)
  • Professional Hard Case

SR1a - Earfield Monitor Specs

Headphone Design: 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: 91dB/1W
Max SPL: 111 dB
Frequency Range: 30Hz – 30kHz
Weight: 425 grams / 15 oz.
Warranty 5 years

Why is the SR1a 33Hz (not 20Hz), for the low-frequency range?
Because they are not sealed around your ears. They will play 20Hz at –6 to –10dB, depending on the wearing angle. This is equal to any high-end speaker.

Jotunheim R - True Ribbon Amplifier Specs

Frequency Response: 20Hz-20Khz, +/-0.1db, 2Hz-500KHz, -3dB, baffle compensation off into SR1a load
Maximum Current, SR1a load: 13.2A per channel, both channels driven, at clipping (10% THD)
THD: <0.0005% at 32 ohms, 1V
THD at 0.2A output into SR1a: <0.014%
THD at 1A output into 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, selectable via front switch
Outputs: Balanced Raal headphone (4-pin male XLR), balanced passive preamp, 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

Jotunheim R - Optional Multibit DAC Specs

USB Input Receiver: C-Media CM6631A
D/A Conversion IC: 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
S/N: >109dB, referenced to 2V RMS, unweighted
Power Consumption: 45W maximum
Size: 9” x 6” x 2”
Weight: 7 lbs

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