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Trilogy 933 Headphone Amplifier

Trilogy 933 Headphone Amplifier

Will drive even the most difficult headphones

£2,329.17 Exc. VAT |  


"... one of the best ­ if not the best ­ headphone amplifiers money can buy."




Trilogy 933 Amplifier for Headphones 

Available on permanent demonstration 

Will drive even the most difficult headphones

Available in natural silver anodise as standard. Custom colours are also available at an extra cost and are painted specifically for you by Trilogy through their Chameleon System. Please contact us for more information or for a price and availability on a colour of your choice.

"... one of the best ­ if not the best ­ headphone amplifiers money can buy."

Alan Sircom Hi-Fi+ Iss94

HiFi Plus Trilogy 933 Headphone Amplifier review 


The task of moving the delicate membrane of a headphone driver is a very different to energising the reactive complex impedance of a multi driver loudspeaker. With much less weight to move and without the masking of listening environment and room interaction, the small signal integrity of an amplifier becomes even more critical than that of a regular power amplifier.

A different approach to design is required. This had led Trilogy to a very different solution to most accessory mass market offerings.

The Trilogy 933 is a clean sheet design with the same natural presentation and vibrant musicality found in Trilogy's award winning pre and power amplifiers. Its a subtle, but crucial distinction: we like to think of the Trilogy 933 as an amplifier for headphones, not a headphone amplifier. 

The svelte amplifier enclosure is machined from a solid billet of aluminium. It's heavy 1.3kg mass provide outstanding physical and electrical isolation for each of the active circuit elements as well as a stable thermal base for headsinking the output devices. 




The 933's amplifier is pure single ended Class A, employing active constant current sources. Each channel has just one continuously biased output device. The output waveform is therefore completely free from crossover distortion and has excellent small signal integrity. 

DC coupling removes capacitors in the signal path, enhancing detail even further. The discrete topology is implemented with carefully selected audio grade components to deliver amazing resolution and drive capability for any high quality headphones. 

The generously rated external power supply can be remotely situated to keep stray electromagnetic fields away. A faraday screened transformer and soft recovery rectifier diodes are complemented by a custom wound input choke.

The choke input topology smooths out the current pulses demanded by the premium Mundorf reservoir capacitors, much like a flywheel, keeping the power supply's dynamic noise very low.

The rear panel offers the user two selectable stereo inputs via high quality gold plated phono connectors.

The 933 can stand alone as the cornerstone of a headphone based system or connect easily to any existing pre-amplifier. 



Volume, mute and balance which are all accessed by the supplied remote control only.

The front of the amplifier has an arc of LEDs which conveniently display the chosen settings which are stored for the next time you power up the 933.

The amplifier is monitored for safe area operation at all times and is automatically muted for power on and off. 

In combination the 933 elements form a whole greater than the sum of its parts. The Trilogy 933's performance bears all the traits you would expect from a full sized Trilogy amplifier: coherence, precision resolution and effortless musicality. The Trilogy 933 is truly a class leading amplifier for headphones.  






 Size (933 Amplifier)

 150x220x38 (WxDxH)

 Size including connectors (933 Amplifier)

 150x235x38 (WxDxH)

 Weight (933 Amplifier)

 1.8 Kg

 Size (PSU)

 132x225x57 (WxDxH)

 Weight (PSU)

 2.85 Kg   

 Packaged Size (Combined)   

 330x290x195 (WxDxH)

 Packaged Weight (Combined)

 5.7 Kg

 Power Consumption

 22 Watts


 2 Stereo line 4 RCA phono sockets

 Input Impedance


 Gain (Max)


 Frequency Responce

 15-120KHz +/- 0.5dB

 Output Impedance

 ≤ 3 Ohms

 Output Power

 800mW into 300 Ohms
 250mW into 60 Ohms 

 Distortion (THD)

 ≤ 0.05% 10mW into 300 Ohms

 Signal to Noise Ratio

 ≥ 85dB A Weighted


 Phase correct (non inverting)



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