Treehaus Audiolab Field Coil Speakers


Treehaus Audiolab field coil Speakers bespoke, field coil high efficiency full range speakers. Built around world- renowned drivers by Atelier Rullit. Rullit utilizes vintage Klangfilm-era cores, reimaging them through a meticulous rebuild process that immediacy, detail, and ease that simply does not exist in many drivers. 


These drivers are then housed in a unique open baffle design that utilizes the acoustic strengths of large live-edge wood slabs, asymmetric component layouts, and the utmost attention to how details affect the sound produced.  

The full-range driver is allowed to gently roll off at the frequency extremes. And when it is said it is full range, it is truly is full range, going below 100hz on its own and well over 15K on the high end.  


The super tweeter is gently filtered by a very high (16kHz+) first-order crossover consisting of a single, high quality capacitor, along with an attenuator so you can adjust the response for your listening taste and room. Utilizing high strength AlNiCo magnets, they also move with speed to match the energy of the main driver.


The speakers are designed to be bi-amped, and the woofer is recommended to be fed by a solid state amplifier, using a DSP module to control its crossover points and response. While this may seem counter to the rest of the Treehaus Audiolab design ethos, the reality is this solution is quite complimentary. With a low-pass crossover, around 90hz or so, the woofers are acting in a frequency range where they are just adding foundation, out of the range or a typical bass guitar. The ear isn’t a sensitive to the nuance here, but it is incredibly sensitive to room interactions and the bass bloat and inconsistent response these frequencies can present. Utilizing DSP, these issues are alleviated, and a sonic base is created that adds the sonic shove of live music without drawing any attention to itself. 

Tube-Rectified Power Supply for Field Coils

Treehaus Audiolab Loudspeakers come in two content levels:

Phantom of Luxury


Open-baffle speaker, approximately 30” wide and 52” tall in live edge Walnut or Elm. Hard Maple side-walls and legs. Atelier Rullit “Super Aero” full-range field coil driver with tube rectified power supply. Fostex T900A Super Tweeter.Atelier Rullit field coil woofer with power supply. High quality crossover using Miflex capacitors and Fostex L-pad super tweeter attenuation. Input panel includes Cardas connectors for speakers, and Neutrik PowerCon for field coil power. MiniDSP module for woofer. Speaker-to-power supply cables included (Belden 9497). Additional options available upon request.

National Treasure


Open-baffle speaker, approximately 24” wide and 52” tall in live edge Walnut or Elm. Hard Maple side-walls and legs. Atelier Rullit “Aero” full-range field coil driver with tube rectified power supply. Fostex T90A Super Tweeter. Permanent magnet woofer. High quality crossover using Miflex capacitors and Fostex L-pad super tweeter attenuation. Input panel includes Cardas connectors for speakers, and Neutrik PowerCon for field coil power. MiniDSP module for woofer. Speaker-to-power supply cables included (Belden 9497). Additional options available upon request.