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Trilogy 931

Trilogy 931

The brief for the 931 project was short but demanding: keep all of the essential elements that make the highly acclaimed 933 so successful, but at a significantly lower cost. There is real challenge in engineering and manufacturing a design without raising costs and also keeping compromise at bay as much as possible. We are extremely proud of the result. The 931 may be affordable, but its performance and quality is still pure Trilogy.

The small, light drivers found in headphones are very closely coupled to the ear and as a result are ruthlessly revealing. They require a completely different design approach to moving the multi driver, complex load of a loudspeaker in a listening room. The 931 is a fully discrete design, no generic integrated circuits or op-amps are used. Designer Nic Poulson could then use all his skills in analogue design to control all the active circuit’s crucial parameters, optimising performance for this intended application only.

Like its bigger brother the 933, the audio circuit operates in pure single ended Class A with active constant current sources. Each channel has a single continuously biased output device. The main benefits of this topology are that the output is free from crossover distortion, and the device is held at a constant temperature.

An oversized linear power supply is implemented with a custom low flux density toroidal transformer and low ESR reservoir capacitors. This provides a low noise supply for the active circuitry with generous operating headroom.

All these elements combine to give excellent small signal resolution while maintaining good drive capability for any type of headphone.

On the CNC machined aluminium front panel a 6.3mm type B stereo jack provides the output.

There are toggles for power and input select for two stereo line inputs. A quality ALPS volume control is coupled to a beautifully weighted custom machined control knob.

The rear panel offers the user two selectable stereo inputs via high quality gold plated phono connectors and the fused IEC mains inlet.

The 931 can connect easily to any existing preamplifier or directly to two stereo sources as a standalone solution for high resolution headphone listening.
Trilogy have maintained the same painstaking attention to build quality with the 931 as with all their designs. Quality components from branded sources are used throughout. Assembly is totally by hand in Trilogy's UK workshops.

Price: 995.00 (Including VAT at 20%)

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