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Kronos AV
Kronos AV
Pro-Ject Audio Systems
Pro-Ject Audio Systems are widely recognised as one of the finest turntable manufacturers in the world. Their mission is simply to produce the best sounding stereo analogue components at the most competitive prices possible. The current series spans a wide range of price points, with a variety of products targeted to key demographics or to accommodate the modern listener’s unique requirements.
In 2016, Pro-Ject marked their 25th anniversary year with the release of a turntable that combined traditional styling with modern technology; showing their innate ability to keep turntables fresh and interesting at a time when popularity of the vinyl format was at a previously unprecedented level. The Classic proudly sits in the middle of a multi-award winning range of turntables that manage to combine sound performance with the latest technologies and unrivalled style at every level.
Pro-Ject are also obsessed with the importance of stereo playback systems. With modern audio systems often bringing speakers either very close together or into a single enclosure, the real impact and importance of true hi-fi stereo is being lost. That’s why everything Pro-Ject create is made with pure stereo applications in mind; bringing back the true emotional importance of music to audio enthusiasts around the world.
Based in Vienna, Austria, all Pro-Ject Audio Systems turntables are made by a highly skilled workforce with great skill, care and attention in their central-European factory.

Pro-Ject Head Box RS Flagship Headphone Amplifier
Free Gift

  • Sale
  • Regular price £699.00
  • Available Worldwide Shipping

Highend headphone amplifier

Ultimate high-end headphone sound!

Head Box RS is a reference class headphone amplifier with fully balanced tube input stage (double triode 6922) and unbalanced Class A "FET (field effect transistor)" output stage. It has one balanced and one unbalanced input with looped outputs for use with other components.

The volume control consists of a high-precision controller for highest channel equality of the left and right channel.

A special impedance selector switch allows you to set the output impedance in 3 levels (5, 20 and 50 ohms) to allow the best possible match between the amplifier and the headphones. We recommend listening with different switch positions to determine the best sound for your headphones.

An elaborate multistage power supply with four different output voltages guarantees the best possible signal-to-noise ratio and the most accurate reproduction of details, dynamics and sound stage with every dynamic headphone!

  • Fully symmetrical double mono construction
  • Tube input stage
  • Class-A FET output stage
  • Selectable output impedance for optimal playback
  • Extremely low distortion
  • Extremely low noise for maximum dynamics and detail
  • 6.3mm jack connection
  • Full metal housing in silver or black
  • Optional upgradeability: Linear power supply Power Box RS Uni 1 (or 4) for even better sound
output 350mW at 32 ohms / 60mW at 300 ohms
crosstalk - 58 dB
frequency response 30 Hz - 20 kHz / (+ 0.2 dB; -0.05 dB)
Total harmonic distortion (IMD 0.17% (XLR in, output impedance 5 ohms, load resistance 32 ohms)
reinforcement 9 dB
Signal to Noise Ratio 99 dBA at full scale
Headphone jack 3-pin jack  6.3 mm
Level inputs 1 pair of RCA / RCA sockets and 1 pair of XLR sockets
High level outputs 1 pair of RCA / RCA sockets and 1 pair of XLR sockets
mains connection Plug-in power supply, 20 V / 3 A DC; 220-240 V, 50 Hz
current consumption 1.3 A DC
Dimensions W x H x D 206 x 72 x 200 (209) mm
mass 2150 g without power supply

We are still delivering orders as normal. When your order ships you will still receive tracking details. For UK shipments, Our couriers have procedures in place to ensure deliveries are arriving as quickly & safely as possible. Drivers can now sign for your parcels, however will notify you that they have arrived, in order to ensure you receive your parcel. Signing for the parcel has now been stopped temporally for hygiene reasons. Drivers are also working with customer instructions, so you can ask them to leave the parcel in a safe place (doorstep etc...) if you prefer not to come into direct contact with the driver.

There has been no changes to deliveries with Brexit. All deliveries to the UK mainland, Northern Ireland and the Republic of Ireland are operating as normal. No VAT or charges are applicable. 

Express Deliveries

Express Delivery is FREE on all orders over £50. Express Delivery offers delivery in 24-72 hours from time of purchase. We use premium couriers for this service, mainly DPD & Royal Mail. DPD will offer you a one hour window for delivery to make sure someone is at home, or you can reschedule the delivery if no one is around. 

Standard Deliveries

Here at Kronos AV, we have vast experience with e-commerce sales. Making sure that your parcel arrives undamaged is a huge priority for us. That’s why at Kronos AV, we only use premium couriers for all our orders. All our parcels are shipped with DPD or Royal Mail and are always sent Signed For to make sure it gets to the right person. 

If for any reason your parcel does arrived damaged, please get in touch, and we will be happy to get everything resolved for you. We are always on hand to help!


Delivery is FREE on all orders over £50. In order to offer FREE delivery to UK customers, we use several premium couriers to ensure your delivery arrives safe.

Most large orders (over 2kg) ship using DPD or DHL courier and smaller orders (under 2kg) by Royal Mail signed for services.

The most appropriate courier will be chosen for the items ordered to ensure the quickest possible delivery.

We can offer very generous trade in offers across the majority of our product range. 

Why not ask and see how much you HiFi is worth!

To find out how much your HiFi is worth... Click Here

If you have any question, please feel free to call us on 03435236169 or email