RAAL SR1a Headphone with Amplifier
Mar 26, 2020 at 9:48 AM Thread Starter Post #1 of 1
Feb 1, 2011

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.

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™ reveals 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 who’s 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.

System Options
The RAAL SR1a is not your typical headphone and will not work on most conventional headphone amplifiers. There are currently 2 different ways to connect and drive these headphones: a special ribbon amplifier (Schiit Jotenheim R) or the interface box with a speaker amp. The SR1a interface box converts a typical speaker amplifier output into the load characteristic that the headphones require. Connect your speaker amplifier to the interface via speaker cables and plug the SR1a into the 4-pin XLR connection on the front of the interface box. We highly recommend the Pass Labs INT-25 as a wonderful option.

Ribbon/Amplifier Interface
RAAL/Requisite Ribbon/Amplifier Interface Box

The amplifier interface box connects between a speaker amp and the SR1a, to achieve 5.6 ohms of combined resistance and 140W of power dissipation with moderate temperature increase. The amplifier connects to binding posts/banana plugs at the back, and at the front, the SR1a cable plugs into a male 4-pin XLR connector. The connector gender is chosen to prevent the possibility of plugging SR1a into a conventional headphones amplifier and effectively short it, causing damage to both the amp and the headphones.
The Amplifier Interface unit is air-cooled, so it should be kept on top and not covered.

Schiit Jotenheim R Amplifier with Optional DAC Card
RAAL/Requisite SR1a with Jotenheim R Amplifier

Designed Especially for Raal/Requisite Headphones
Let’s be clear. If you have other kinds of headphones, this amp isn’t for you. This amp was designed for one kind of headphones only: the Raal/Requisite ribbon headphones. Delivering up to 13A (amps…yes, amps) per channel into the Raal’s extremely low impedance load, and including the baffle compensation needed for the SR1a, the Jotunheim R is completely unique. It means you can leave your speaker amp behind, forget the Raal/Requisite interface box, and, if you buy it with the optional True Multibit™ DAC, you have a one-box system that’s easily transportable.

Configure To Your Needs
Select Jotunheim R as just an amp, or add an internal DAC card to tailor the system to your needs.
  • No DAC. If you already have a DAC, or don’t need one, choose Jotunheim R without a DAC module or external DAC.
  • True Multibit DAC module (internal). Choose the optional Multibit DAC Module to get Schiit’s unique digital filter and multibit DAC architecture, for $200 more
Flexibility and Convenience
Jotunheim R provides switchable baffle compensation, to ensure compatibility with future ribbon headphone models, as well as switchable passive preamp outputs, and both balanced and single-ended inputs. No power bricks or external power supplies are required; it plugs straight into the wall for maximum convenience.

Unique Nexus™ Discrete Gain Stage with Ultra-High-Current Output
Jotunheim uses the unique Nexus™ gain stage that debuted on the flagship Ragnarok 2 integrated amplifier. This inherently balanced, differential, current-feedback topology accepts both balanced and single-ended input without the need for splitters and summers.

Designed and Built in California
The vast majority of the total production cost of Jotunheim — chassis, boards, transformers, assembly, etc — goes to US companies manufacturing in the US. The chassis are made minutes from the facility. The PCBs are done just over the hill, or done in Northern California. The transformers are also made in California. You get the picture.

5-Year Warranty
The RAAL SR1a and Jotunheim R are covered by a 5-year limited warranty that covers parts and labor. See Specifications below for more details.


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