Trilogy 931 Headphone Amplifier
The way we listen constantly changes and evolves, more of us are now interested in quality headphone listening than ever before. Following the overwhelmingly positive reception of the 933, which exceeded all our expectations, we decided to make a headphone amplifier with a wider reach.
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.
|Size including connectors||140*244*50(W*D*H)|
|Packaged Size||240*350*85 (W*D*H)|
|Packaged Weight||2.3 Kg|
|Power consumption||16 Watts|
|Inputs||2 Stereo line 4 RCA phono sockets|
|Input Impedance||≥50K Ohms|
|Frequency response||20-20KHz +/- 0.5dB|
|Output impedance||≤ 10 Ohms|
|Output Power|| 800mW into 60 Ohms
200mW into 300 Ohms
|Distortion (THD)||≤ 0.05% 10mW into 300 Ohms|
|Signal to Noise Ratio||≥ 85dB A Weighted|
|Phase||Phase correct (non inverting)|