Unison Research SH Headphone Amp Headphone Amplifiers

Unison Research SH Headphone Amp

  • Product Code: SH
  • £1,400.00

Unison Research are expanding on their class-leading range of valve-based hi-fi electronics to produce their first ever dedicated headphone amplifier solution. The SH is a single-ended, two-stage full-valve headphone amplifier designed to accommodate traditional analogue and modern computer-based audio sources.

The Unison Research SH began with the same basic remit as the coveted Simply Italy integrated amplifier; to produce a world-class sound from a specialised device using the best technology available. The result was a fairly simple, linear circuit that produces an output voltage which is more than capable of driving a wide range of headphones, while keeping distortion low throughout the frequency range. This allows the SH to deliver a consistent, coherent sound character when in use.

The input stage uses ECC83 valves, while the output stage uses one EL84 valve (both operating in triode mode). The benefits to using this specific combination of valves are in the reduced power requirements for how the valves are usually employed, resulting in extended life, and the EL84’s ability to drive an output transformer with optimal electrical and sound qualities. 

The SH comes equipped with two headphone outputs, connected in parallel for easy switching between headphones, or to accommodate multiple listeners. There is also a “Sensitivity” switch, to ensure the widest possible range of headphones can be comfortably driven by this amplifier. When set to “High Sensitivity”, the output voltage from the amplifier is reduced, and at “Low Sensitivity” it is at its maximum. The added advantage of this switch is for maintaining optimal sound quality while listening to music at lower volumes.

In addition to a standard un-balanced RCA input for connecting any traditional analogue source, the SH is also equipped with a class-leading USB DAC. The asynchronous USB 2.0 technology is the same as found on the recent Triode 25 amplifier, and supports audio formats up to 384kHz PCM and DSD 128. The patented jitter-elimination circuit ensures a great sonic performance, assisted by the galvanic isolation employed between the power areas of the USB interface and the conversion IC. This additional input option brings SH up-to-date with the latest requirements of computer-based audiophiles.

The reason for choosing a headphone-based product was so Unison Research could cater for the growing world of headphone audiophiles, offering them the best valve-based amplifier to enjoy. It’s very difficult for solid-state solutions to compete with the un-rivalled influence valves can have on audio performance, making the SH a must-audition for anyone who takes their sound seriously.

Key Features:

Compatible with large selection of headphones

ECC83 Valve used on input stage and EL84 on output stage

Asynchronous USB interface compliant to USB 2.0 Audio Class

Resolution up to 32bits/384kHz

Last generation ESS Sabre DAC with jitter eliminator circuit

Galvanic isolation between USB interface and conversion circuit

Low phase noise clocks which reside in the “clean” supply domain to preserve low jitter performance

Amplifiers
Input Impedance - Line Level 20 kohm // 100 pF Sensitvity 0.67 V: High Sensitvity, (10Ω Load) 0.33V Out Low Sensitvity, (33Ω Load) 1V Out
Output Impedance 6.9Ω
Power Consumption 45W
THD (Total Harmonic Distortion) < 0.2% @ 1kHz 0.5V, < 0.8% to 1 V
Frequency Response -0.1dB @ 10Hz / 3-dB @ 50kHz (Low Sensitvity Output with 33Ω Load)
Inputs 1 x RCA Line Level, 1 x USB (Type-B)
Outputs 2 x ¼” Jack Sockets (in parallel)
Dimensions (H x W x D) 322mm x 225mm x 126mm
Weight 6 KG

2 Years Warranty (terms & conditions apply)

At Audio Destination we use various delivery methods to suit various needs from standard Royal Mail services (1st Class,Recorded or Special Delivery) to a fully insured courier service (one we have used for many years) depending on size,weight and cost of item.

Postage costs will show at checkout.

One thing customers can rely upon is Audio Destination will do whatever we can to get the item you have purchased to you as quickly as possible but again we will inform you if there are likely to be any delays.

Should any problems arise or any special request need to be catered for then please call us on 01884 243584 (and ask for Mike or Caroline) or leave a message in the comments section when ordering and this way we can make your experience of ordering from Audio Destination as enjoyable as possible.

Unison Research are expanding on their class-leading range of valve-based hi-fi electronics to produce their first ever dedicated headphone amplifier solution. The SH is a single-ended, two-stage full-valve headphone amplifier designed to accommodate traditional analogue and modern computer-based audio sources.

The Unison Research SH began with the same basic remit as the coveted Simply Italy integrated amplifier; to produce a world-class sound from a specialised device using the best technology available. The result was a fairly simple, linear circuit that produces an output voltage which is more than capable of driving a wide range of headphones, while keeping distortion low throughout the frequency range. This allows the SH to deliver a consistent, coherent sound character when in use.

The input stage uses ECC83 valves, while the output stage uses one EL84 valve (both operating in triode mode). The benefits to using this specific combination of valves are in the reduced power requirements for how the valves are usually employed, resulting in extended life, and the EL84’s ability to drive an output transformer with optimal electrical and sound qualities. 

The SH comes equipped with two headphone outputs, connected in parallel for easy switching between headphones, or to accommodate multiple listeners. There is also a “Sensitivity” switch, to ensure the widest possible range of headphones can be comfortably driven by this amplifier. When set to “High Sensitivity”, the output voltage from the amplifier is reduced, and at “Low Sensitivity” it is at its maximum. The added advantage of this switch is for maintaining optimal sound quality while listening to music at lower volumes.

In addition to a standard un-balanced RCA input for connecting any traditional analogue source, the SH is also equipped with a class-leading USB DAC. The asynchronous USB 2.0 technology is the same as found on the recent Triode 25 amplifier, and supports audio formats up to 384kHz PCM and DSD 128. The patented jitter-elimination circuit ensures a great sonic performance, assisted by the galvanic isolation employed between the power areas of the USB interface and the conversion IC. This additional input option brings SH up-to-date with the latest requirements of computer-based audiophiles.

The reason for choosing a headphone-based product was so Unison Research could cater for the growing world of headphone audiophiles, offering them the best valve-based amplifier to enjoy. It’s very difficult for solid-state solutions to compete with the un-rivalled influence valves can have on audio performance, making the SH a must-audition for anyone who takes their sound seriously.

Key Features:

Compatible with large selection of headphones

ECC83 Valve used on input stage and EL84 on output stage

Asynchronous USB interface compliant to USB 2.0 Audio Class

Resolution up to 32bits/384kHz

Last generation ESS Sabre DAC with jitter eliminator circuit

Galvanic isolation between USB interface and conversion circuit

Low phase noise clocks which reside in the “clean” supply domain to preserve low jitter performance

Amplifiers
Input Impedance - Line Level 20 kohm // 100 pF Sensitvity 0.67 V: High Sensitvity, (10Ω Load) 0.33V Out Low Sensitvity, (33Ω Load) 1V Out
Output Impedance 6.9Ω
Power Consumption 45W
THD (Total Harmonic Distortion) < 0.2% @ 1kHz 0.5V, < 0.8% to 1 V
Frequency Response -0.1dB @ 10Hz / 3-dB @ 50kHz (Low Sensitvity Output with 33Ω Load)
Inputs 1 x RCA Line Level, 1 x USB (Type-B)
Outputs 2 x ¼” Jack Sockets (in parallel)
Dimensions (H x W x D) 322mm x 225mm x 126mm
Weight 6 KG

2 Years Warranty (terms & conditions apply)

At Audio Destination we use various delivery methods to suit various needs from standard Royal Mail services (1st Class,Recorded or Special Delivery) to a fully insured courier service (one we have used for many years) depending on size,weight and cost of item.

Postage costs will show at checkout.

One thing customers can rely upon is Audio Destination will do whatever we can to get the item you have purchased to you as quickly as possible but again we will inform you if there are likely to be any delays.

Should any problems arise or any special request need to be catered for then please call us on 01884 243584 (and ask for Mike or Caroline) or leave a message in the comments section when ordering and this way we can make your experience of ordering from Audio Destination as enjoyable as possible.

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