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Kronos AV
Kronos AV

Fostex TH909 Reference Open Back Headphones
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  • Regular price £1,649.00
  • Available Worldwide Shipping

Our Customer Love Us
  • Wide dynamic range and low distortion
  • 1.5 Tesla 50mm driver with repulsion magnet
  • Proprietary "Biodyna" diaphragm material
  • Double layer structure etching metal grill housing opening
  • Japan Lacquer Bordeaux finish
  • Supports balanced connection with optional XLR cable
  • Internal wiring uses 7N grade cable
  • Rhodium plating on detachable connectors
  • Newly designed low-resilience cushion ear pad
  • Includes OFC (Oxygen Free Copper) unbalanced cable
  • Includes ST300 Headphone Stand and Carrying Bag

Building on the design of Fostex's TH900 MK2 model, the new flagship TH909 headphone utilises an open-back assembly to increase the soundfield whilst retaining the signature of the TH900 MK2’s characteristics.

The TH909’s diaphragm is made up proprietary ‘Biodyna’ material for remarkable frequency response including natural sounding mids, rich lows and excellent presence in high bands.

The beautifully unique TH909 cup 'Lacquer Bordeaux' finish is designed and purpose-built in Japan’s Sa-kamoto Urushi Factory, established in 1900.


Type:   Dynamic, 50mm Operation:   Open back


Impedance:   25 ohm Sensitivity:   100dB/mW (at 1kHz, 1mW) Frequency response:   5Hz – 45kHz Max Input Power:   1,800mW

Physical Properties

Weight:   390g (excluding the cable)

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. 

We have several deomonstation areas in both of our branches. Please give us a call on 03435236169 or email support@kronosav.com to enquire about hearing products at your local branch. 

Please always contact us before to make sure the product(s) are available

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!

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If you have any question, please feel free to call us on 03435236169 or email support@kronosav.com