DACS Purity – Headphone Amplifier

DACS Purity – Headphone Amplifier

The DACS Purity is a Class A, powerful headphone amplifier designed to drive any set of headphones to their ultimate performance level. Zero Ohm output impedance remains constant, even whilst sinking back EMF generated by high power headphones, meaning the strongest transients don’t degrade performance. The Purity features balanced and unbalanced inputs, selectable via the front panel, and a TRS and 4 pole XLR headphone outputs, the latter providing a huge soundstage and staggering detail. The DACS Purity is the ultimate headphone amplifier for mixing and mastering engineers.

Drive Topology

Listening tests with a big mix of headphones confirm DACS Pure 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 CMRRto give the most accurate interference free signal.

Differential Output

Then we looked at balanced headphones. The Purity Headphone Amplifier provides remarkably low cross talkbetween 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.

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 PSUs 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.

Specifications

• 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
• Z out: <0.1
• SNR: 124 dB
• IMD: <0.005%
• Dynamic Range: 124 dB
• Frequency Response: 5-20kHz +/-0.15dBu