Drive Topology

Listening tests with a big mix of headphones confirm DACSPure Class A topology excels for all types of headphones and listening levels. To run in Class A the Purity Headphone Amplifier and Purity BDZ© Power Supply generate a lot of heat. The case and inaudible ultra-quiet Noctua fan provide plenty of airflow to keep the temperature stable whatever the load.

Differential Input

DACS’ balanced input uses an instrumentation format, with hand trimmed CMRR [1] to give the most accurate interference free signal.

Differential Output

Then we looked at ‘balanced’ headphones. The Purity Headphone Amplifier provides remarkably low cross talk [2] between the two independent amplifier channels; using balanced output connections, that channel independence is maintained without compromise from the Purity BDZ© Power Supply all the way to the ears.

[1] Common Mode Rejection Ratio, a measure of the circuits ability to reject interference.

[2] through its super steady Zero Ohm output impedance and a star earth scheme.

Purity Power Supply

The new Purity BDZ© Power Supply uses a super stable, super low noise op-amp-based design, with Zero Ohm output impedance. When driven hard headphones produce back EMF, ie current flowing back towards the voltage regulator causing instability. In conventional PSU designs, this back EMF significantly reduces the PSU’s performance, with the amplifier losing control of the headphones, and generating distortion. DACS’ unique Purity BDZ© Power Supply design sinks that current away ensuring zero Ohm impedance and total output voltage stability, whatever is happening at the headphones.

The Listening Experience

You hear everything. Every spatial nuance, every timbral detail, every element of the musical spectrum, every fine adjustment. Poor mixes will be revealed, but great mixes will stand out in all their glory. Your headphones will give you more than you thought they could. Enjoy.

DACS Audio Purity Headphone Amplifier

£0.00 £1,800.00 inc. VAT
£1,500.00 exc. VAT

DACS Audio Purity Headphone Amplifier

The Purity Headphone Amplifier has been a 2-year journey for DACS. Building on the renowned HeadLite lineage, DACS wanted to offer something exceptional for mastering and mixing engineers, and others who work professionally with headphones. Running in Pure Class A, the Purity Headphone Amplifier will drive any set of headphones to their ultimate performance level. DACS developed the unique Purity BDZ© Power Supply for Purity; the Zero Ohm output impedance is constant, even while sinking back EMF generated by high power headphones, so the strongest transients don’t degrade performance. Using an instrumentation style hand trimmed balanced input, interference pickup is minimised. The 4 pole XLR output gives you huge sound stages with staggering detail. Performance specs reflect this: THD+N, 1kHz sine wave at +18dBu into 150 Ohms is 0.00085%, while frequency response is ±0.15dB at 20Hz to 20kHz, and ±0.3dB for 20Hz to 28kHz. Crosstalk between channels is -110dB. Power at 20 Ohms is 4.5W with .015% distortion.

The DACS Clarity HeadLite is renowned for its power and accuracy and has been driving studio headphones for more than 20 years. The HeadLite3+ with its +Power modules was developed to cater for the growth in high-power, high-fidelity headphones. The next step up was Purity.

We set to work designing an amplifier that would drive any set of headphones to their optimum performance. After two years of an intense R&D journey the Purity Headphone Amplifier has left the drawing board. It’s Pure Class A output and huge transient loving headroom make any pair of headphones sound their very best.


Inputs - RCA & Balanced XLR/Jack

Outputs - 3P Jack & 4-Pin XLR Balanced 

Gain - +10dB Unbalanced, +3dB Balanced

THD+N - 0.00078% @ 1kHz +18dBu input, 0.00095% 20Hz - 20kHz

Zout - <0.1 Ω 

SNR - 124 dB

IMD - <0.005%

Dynamic Range - 124 dB

Frequency Response - 5-20kHz +/-0.15dBu


W: 210mm

H: 210mm (inc feet)

D: 300mm (inc knob & pole connectors)

Weight 2.5kg


H: 230mm

W: 350mm

D: 470mm

Total Weight 4.8kg