Requisite SR1a True Ribbon Earfield Monitors / Jotunheim Amp (Used)

The world’s first True Ribbon™ headphones with Earfield™technology. Take mixing, mastering, and home listening into a different league,with unparalleled power and realism of True Ribbon™ drivers. Reference accuracyis projected with Earfield™ technology for a speaker-like soundfieldexperience, unlike anything heard before.

True Ribbon™ SR1a.
The World’s First Earfield™ Headphone Monitor.

The SR1a byRAAL-requisite is the world’s first Earfield™ headphone monitor. Experiencemixing, mastering, and home listening with unparalleled accuracy and realism ina soundfield devoid of room acoustics and comb-filtering caused by work surfacereflections. Earfield™ technology delivers unheard of program accuracy and aspeaker-like soundfield experience.

“Even compared toheadphones already well regarded for their ability to render micro-details,such as Focal’s Utopia, the STAX SR-009S or the LB-Acoustics MySphere, the SR1aare clearly superior.´´

IAN DUNMORE Bolt fromthe Blue: RAAL-requisite SR1a “EarField™ Monitors” HEADPHONES.COM

“Honestly, no producthas ever captured my attention, caused me to listen to more music, or garneredmy enthusiasm like the SR1a Earfield headphone monitors.  I’ve listened tothem nearly every day since I took delivery. I frequently sit across the roomfrom a $100,000+ audio system, looking at it, while listening through theseheadphones. The SR1a is that good. Stunning, amazing, and the only headphonecapable of pulling me away from my main audio system.´´

SR1A REVIEWED TheComputer Audiophile. Audiophile Style

Award After Award.

“I frequently sitacross the room from a $100,000+ audio system, looking at it, while listeningthrough these headphones. The SR1a is that good. Stunning, amazing, and theonly headphone capable of pulling me away from my main audio system.´´

2020 CASH AWARD TheComputer Audiophile. Audiophile Style

“The SR1A makes me notwant to listen to any other headphones. Or from someone I respect, It’s whatevery headphone wishes it could be.´´

2019 GOLDEN SCHLONGAWARD – BEST HEADPHONES Super Best Audio Friends

Headphone Guru FrankIacone Award

2019 FRANK IACONE AWARD.FRANK IACONE. HEADPHONE.GURU

Gold in High-EndHeadphone Category

2019 FUJIYA AVIC GOLD´

2019 Fujiya AvicHeadphone Festival in Tokyo

Silver in Entire ShowCategory

2019 FUJIYA AVIC SILVER

2019 Fujiya AvicHeadphone Festival in Tokyo

“Equal to the bestpossible big hifi systems but without any of their issues of room interference,cabinet interference, port interference, and crossover interference.´´

2019 BLUE MOON AWARD. SRAJANEBAEN. 6MOONS.COM

Ribbons for a Reason.

The SR1a is the world’sfirst True-Ribbon™ headphone. Highly specialized ribbon drivers were developedthat reproduce 30Hz to 30kHz bandwidth in order to eliminate the need forsealed chambered bass and allow for open air baffles (both front and back) fora true full-frequency soundfield.

“World classprofessional monitors I can take on the road! I can finally trust my soundeverywhere.´´

RAFA SARDINA 13-TimeGrammy® & Latin Grammy® Award Winning Producer/Mixer/Engineer

“Remarkable Sound& Remarkable Design.´´

JACK JOSEPH PUIG GrammyAwarded Producer/Engineer (John Mayer, Barbra Streisand, Eric Clapton, Weezer,No Doubt, Green Day, U2, Counting Crows)

SR1a Freedom.

Professional engineersreport that SR1a Earfield Monitors™ reveal more detail and accuracy than eventheir finest traditional studio monitors or headphones. Helping to achievehigh-quality, transferable mix results in non-traditional environments. Theaccuracy, musicality and portability of the SR1a frees the engineer to workwhenever, and wherever they choose.

“A radical departurefrom traditional headphone designs that presents speed, dynamics and imagingthat exceeds flagship planar and electrostatic systems. Arguably the mostexciting new development in headphone engineering in a long time.´´

VICTOR YE Audiophileand Sound Engineer

Superior Comfort.

Weighing in at only 425grams (15 ounces). Unlike standard headphones whose weight and heat createlistener discomfort over time. The SR1a Earfield™ design eliminates heatbuildup on the ears providing a cool, natural airflow. Your ears will alsoappreciate the complete absence of sound pressure against the eardrums causedby traditional sealed can designs. SR1a headphones can be worn comfortably formany hours at any listening level.

“Unparalleledmusicality and detail… A completely adjustable soundstage, able to reproduce anear-field loudspeaker experience (not approximate or fake, but real, twochannel imaging).´´

GARY ALAN BARKER CanJamat Rocky Mountain Audio Fest 2018 HEADPHONE.GURU

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 Europeancraftspeople who build world-renowned RAAL ribbon tweeters.

SPECIFICATIONS

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

 

JOTUNHEIM R

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

Designed Especially for RAAL-requisiteTrue-Ribbon Headphones

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

Flexibility and Convenience

Jotunheim R provides switchable bafflecompensation, to ensure compatibility with future ribbon headphone models, aswell as switchable passive preamp outputs, and both balanced and single-endedinputs. No power bricks or external power supplies are required; it plugsstraight into the wall for maximum convenience.

Unique Nexus™ Discrete Gain Stage withUltra-High-Current Output

This inherently balanced, differential,current feedback topology accepts both balanced and single-ended input withoutthe need for splitters and summers.

Designed and Built in California

By “designed and built in California”this is what we mean: the vast majority of the total production cost ofJotunheim—chassis, boards, transformers, assembly, etc—goes to US companiesmanufacturing in the US. Our chassis are made minutes from our facility. OurPCBs are done just over the hill from us, or done in NorCal. Our transformersare also made in California. You get the picture.

Optional Multibit DAC:

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