---
product_id: 89563818
title: "Fostex TH-909 Premium Open-Back 1.5 Tesla Stereo Headphones"
brand: "fostex"
price: "€ 4497.54"
currency: EUR
in_stock: true
reviews_count: 7
category: "Fostex"
url: https://www.desertcart.gr/products/89563818-fostex-th-909-premium-open-back-1-5-tesla-stereo
store_origin: GR
region: Greece
---

# Japanese Cherry Birch Urushi lacquer 50mm dynamic driver 1.5 Tesla neodymium magnet Fostex TH-909 Premium Open-Back 1.5 Tesla Stereo Headphones

**Brand:** fostex
**Price:** € 4497.54
**Availability:** ✅ In Stock

## Summary

> 🎶 Elevate your audio game with the TH-909 — where art meets audiophile precision.

## Quick Answers

- **What is this?** Fostex TH-909 Premium Open-Back 1.5 Tesla Stereo Headphones by fostex
- **How much does it cost?** € 4497.54 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/89563818-fostex-th-909-premium-open-back-1-5-tesla-stereo)

## Best For

- fostex enthusiasts

## Why This Product

- Trusted fostex brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Immersive Open-Back Design:** Experience expansive soundstage with dual-layer etched metal grille for rich resonance and spatial clarity.
- • **Biodyna Diaphragm Precision:** Enjoy crystal-clear highs, natural mids, and deep bass with Fostex’s signature fine-resolution driver tech.
- • **Customizable Connectivity & Comfort:** Detachable 7N OFC cable with optional balanced XLR support plus plush Eggshell Membrane ear pads for all-day wear.
- • **Luxury Craftsmanship Meets Durability:** Handcrafted Japanese Cherry Birch housings with traditional Urushi lacquer and rhodium-plated connectors for lasting elegance.
- • **Powerful 1.5 Tesla Magnetic Circuitry:** Unleash wide dynamic range and ultra-low distortion with cutting-edge neodymium magnets.

## Overview

The Fostex TH-909 Premium Open-Back Headphones combine a 50mm Biodyna dynamic driver with a powerful 1.5 Tesla neodymium magnetic circuit to deliver a wide dynamic range and low distortion. Featuring a dual-layer etched metal grille and handcrafted Japanese Cherry Birch housings finished in traditional Urushi lacquer, these headphones offer an expansive soundstage with exceptional clarity. Equipped with detachable high-purity OFC cables and comfortable Eggshell Membrane ear pads, the TH-909 is designed for discerning audiophiles seeking both luxury and performance in an open-back format.

## Description

The Fostex TH-909 is a flagship model based on the closed type TH900mk2 headphones. While keeping the same sound characteristic, Fostex further expanded and increased its sound field by adopting an open type format and adjusting the acoustic circuit. TH-909 offers a wider dynamic range with low distortion using a 1.5 Tesla 50mm driver with repulsion magnet. The diaphragm is made of "Biodynina", accomplishing rich very low frequency, natural mid range and excellent high frequency reproduction. A double layer structure etching metal is used as the housing opening to diversify the resonance points and offer a gorgeous appearance. The housing cover features a beautiful Japanese lacquer Bordeaux finish. A 7N grade high purity OFC unbalanced cable is included as standard; equipped with detachable connector. Support the balanced connection with optional XLR cable (sold separately - ET-H3.0N&BL). The detachable connector terminal and cable connector feature rhodium plating for excellent abrasion and corrosion resistance. The newly designed ear pad adopts a low-resilience cushion to achieve a comfortable fit.

Review: Fullness of sound, a beautiful indulgence - -2018, a strange year for headphones- Foster Electronics, Fostex’ parent company, have a storied history as a technology leader for closed back headphones. They provided the drivers for the legendary Sony R10 , they were the OEM manufacturer behind the original Denon D2000/5000/7000 models and their headphones have been the platform for an entire industry of professional modders (ZMF, Mr. Speakers, Modhouse etc). Recently, Fostex produce their own high end, top of the line closed backs, the TH900. It was strange, then, to hear Fostex announce this new flagship OPEN BACK headphone. Bizarrely, Sennheiser - the German shop that invented the open back headphone - released their own new flagship closed back HD820 in 2018 as well, in a similar twist. In both cases, this inversion of the brand identity is at the heart of the mixed reaction to the product. Indeed, I myself had conflicted feelings about Fostex’ decision to lop off the cap of the TH900's beautiful Urushi lacquer cups and replace it with a (striking!) dual layer open grille. The re-tuned voice circuit intrigued me enough to try, however. I am pleased to report that the dual layered grille adds some substantial technical benefits to this headphone, but also that the sonic re-tune makes for a highly complementary headphone. -Impressions- Physically, there is a great deal of similarity between this product and the TH900. They feature the same Urushi lacquer cups (so gorgeous!), and come with a similar list of accessories. The wooden stand to display your headphone treasure is much appreciated, although I did miss the nice product story brochure that came with the TH900. None of the TH series have inspired a great deal of confidence in me for build quality, definitely coming across as quite delicate - that said the headband slider does feel a little more substantial on this new TH909 (and is also about notch smaller, FYI), and I have had no issues with any of my own TH models. Sound wise, these are something of a departure from the signature V shaped profile Fostex is known for. The updated tuning has added a significant boost around 500 Hz, where the 900 had a null. This is an extension of the VERY heavy bass emphasis on both models, and results in an incredible full sound on the 909 extending up into the mids. The upper mids, and highs however are highly consistent with the Fostex tuning. Compared to most tuning, these have recessed output between 1-2KHz. They also have a similar ~6KHz spike and a generally brighter emphasis in the high mids above 3 kHz. The result is a sound signature that is full bodied for acoustic and vocal recordings, while still retaining the signature high freqeuncy sparkle that Fostex is known for. The bass output is similar amplitude, however the higher mids on the TH909 mean the perceived bass is lower than that of the TH900. The mid boost can also border into 'shouty' on some recordings, however these are wonderfully capable for EQing if you feel the desire to compensate: -Technical Performance- Measurements of these headphones are sparse, but they show excellent performance. Fostex’ Biodynia diaphragm has always shown exceptionally low distortion (trivial), but the 909's new dual layer open grille has done an excellent job retaining the phase information for the listener. Phase refers to the relative maxima and minima of a particular frequency waveform. Humans use the phase information in sound to understand positioning data of the sources - generally the phasing will correspond to the time of arrival which we are evolved to be very sensitive to. A uniform phase response in a speaker means that the transducer won't add spatial coloration, and instruments will be tightly resolvable in a good recording. These TH909 exhibit phase uniformity within about 10 degrees, which is very impressive for a dynamic transducer. Compare this to about 20 degrees for the Sennheiser HD800s, and about 50 degrees for the Focal Utopia - similar open backed flag ship cans. This is particularly impressive given how low impedance the Fostex 909's are - 300 ohms for the 800s, 85 ohms for the Utopia and only 25 ohms on the 909. Phase uniformity can generally be improved by using a thicker copper coil (higher impedance, more resistance relative to the parasitics). The Beyerdynamic DT880 has excellent phase uniformity in its 600 ohm version for instance, but quite a bit of variation in 32 ohms. [Check out Tyl's measurements at Innerfidelity and also Brent Butterworth's at SoundStrageNetwork for the 909 measurements] -Amplification- A great deal of speculation surrounds the pairing of these with different amplifiers, and they do present a challenge to conventional audiophile 'wisdom' in this respect. As audiophiles, we are unfortunately largely drawn to higher power output when it comes to amplifiers. Many audiophile dynamics are indeed high impedance (see above rant on phase), so generally this trend is OK, but for a low impedance like the TH909 this actually poses quite a challenge for an amplifier. Amps feed current to the headphone, the level of which will depend on the impedance of the headphone and the power rating of the amp. A high impedance load means that not much current is required from the amp to deliver its power rating. A low impedance however, will draw tons of current (if you follow the trend to zero, you are essentially approaching a short circuit), which risks over-saturating otherwise mighty high powered amps. A low impedance like the 909 risks oversaturating the amp, but it will also present this scenario in a particularly unflattering way. The harmonic distortion that this introduces in the source signal are emphasized by their relatively bright high frequencies. With this in mind, when it comes to amping these - less is more for power rating. Fostex themselves sell several nice options (I have been feeding these and my TH900's from the HPA-4BL pictured), but I have also found my lean little IFI nano Black Label sing nicely. In contrast, I keep my THX for high impedance / less sensitive loads. -The bottom line- Frequency response wise these may not work as a jack of all trades, their performance is such that you can EQ them into just about anything you want while retaining transparency. I for one, really like the signature. Highly recommended!
Review: Great headphones - These are great headphones. They look beautiful and they are very comfortable. Compared to the Audeze LCD-MX4, which is what I have been using, the most obvious difference is the much more prominent bass.

## Features

- Open-backed stereo headphones with detachable cable system; optional balanced cable available
- Dual-layer etched metal structure for housing opening diversifies resonance points
- Neodymium magnetic circuitry with 1.5 tesla magnetic flux for wide dynamic range
- Fostex Biodyna diaphragm for fine and high resolution sound reproduction
- Japanese Cherry Birch (Betula Grossa) housings with traditional Urushi lacquer; Eggshell Membrane Ear Pads and 7N grade OFC (Oxygen Free Copper) Cable

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07HHVBCHH |
| Additional Features | Lightweight |
| Age Range Description | Adult |
| Antenna Location | Music |
| Audio Driver Size | 50 millimeters |
| Audio Driver Type | Dynamic Driver |
| Best Sellers Rank | #197,089 in Musical Instruments ( See Top 100 in Musical Instruments ) #415 in Recording Headphone Audio Monitors |
| Brand | Fostex |
| Brand Name | Fostex |
| Built-In Media | Cable |
| Cable Features | Detachable |
| Carrying Case Color | Bordeaux |
| Color | Red |
| Compatible Devices | Most devices with 3. |
| Connectivity Technology | Wired |
| Control Method | Remote |
| Control Type | Voice Control |
| Customer Package Type | Rigid Protective Packaging |
| Customer Reviews | 5.0 out of 5 stars 10 Reviews |
| Ear Placement | Over Ear |
| Earpiece Shape | Over-ear cup |
| Enclosure Material | Biodyna, Metal, Japan Lacquer Bordeaux finish, High purity OFC (Oxygen Free Copper), Rhodium plating |
| Form Factor | Over Ear |
| Frequency Range | 5Hz – 45kHz |
| Global Trade Identification Number | 00636827308373 |
| Headphone Folding Features | Over Ear |
| Headphone Jack | 3.5 mm Jack |
| Headphones Ear Placement | Over Ear |
| Headphones Jack | 3.5 mm Jack |
| Item Type Name | DJ Headphones |
| Item Weight | 16 ounces |
| Manufacturer | Fostex |
| Model Name | TH-909 |
| Model Number | AMS-TH-909 |
| Noise Control | None |
| Number of Items | 1 |
| Specific Uses For Product | Music |
| Style Name | Premium |
| UPC | 636827308373 |
| Unit Count | 1 Count |
| Warranty Description | 1 Year |
| Water Resistance Level | Not Water Resistant |

## Product Details

- **Brand:** Fostex
- **Color:** Red
- **Ear Placement:** Over Ear
- **Form Factor:** On Ear
- **Noise Control:** None

## Images

![Fostex TH-909 Premium Open-Back 1.5 Tesla Stereo Headphones - Image 1](https://m.media-amazon.com/images/I/61aATK5KzuL.jpg)
![Fostex TH-909 Premium Open-Back 1.5 Tesla Stereo Headphones - Image 2](https://m.media-amazon.com/images/I/6145gy5kDML.jpg)
![Fostex TH-909 Premium Open-Back 1.5 Tesla Stereo Headphones - Image 3](https://m.media-amazon.com/images/I/516AK558lKL.jpg)
![Fostex TH-909 Premium Open-Back 1.5 Tesla Stereo Headphones - Image 4](https://m.media-amazon.com/images/I/41-A0Tusv1L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Fullness of sound, a beautiful indulgence
*by A***R on June 26, 2019*

-2018, a strange year for headphones- Foster Electronics, Fostex’ parent company, have a storied history as a technology leader for closed back headphones. They provided the drivers for the legendary Sony R10 , they were the OEM manufacturer behind the original Denon D2000/5000/7000 models and their headphones have been the platform for an entire industry of professional modders (ZMF, Mr. Speakers, Modhouse etc). Recently, Fostex produce their own high end, top of the line closed backs, the TH900. It was strange, then, to hear Fostex announce this new flagship OPEN BACK headphone. Bizarrely, Sennheiser - the German shop that invented the open back headphone - released their own new flagship closed back HD820 in 2018 as well, in a similar twist. In both cases, this inversion of the brand identity is at the heart of the mixed reaction to the product. Indeed, I myself had conflicted feelings about Fostex’ decision to lop off the cap of the TH900's beautiful Urushi lacquer cups and replace it with a (striking!) dual layer open grille. The re-tuned voice circuit intrigued me enough to try, however. I am pleased to report that the dual layered grille adds some substantial technical benefits to this headphone, but also that the sonic re-tune makes for a highly complementary headphone. -Impressions- Physically, there is a great deal of similarity between this product and the TH900. They feature the same Urushi lacquer cups (so gorgeous!), and come with a similar list of accessories. The wooden stand to display your headphone treasure is much appreciated, although I did miss the nice product story brochure that came with the TH900. None of the TH series have inspired a great deal of confidence in me for build quality, definitely coming across as quite delicate - that said the headband slider does feel a little more substantial on this new TH909 (and is also about notch smaller, FYI), and I have had no issues with any of my own TH models. Sound wise, these are something of a departure from the signature V shaped profile Fostex is known for. The updated tuning has added a significant boost around 500 Hz, where the 900 had a null. This is an extension of the VERY heavy bass emphasis on both models, and results in an incredible full sound on the 909 extending up into the mids. The upper mids, and highs however are highly consistent with the Fostex tuning. Compared to most tuning, these have recessed output between 1-2KHz. They also have a similar ~6KHz spike and a generally brighter emphasis in the high mids above 3 kHz. The result is a sound signature that is full bodied for acoustic and vocal recordings, while still retaining the signature high freqeuncy sparkle that Fostex is known for. The bass output is similar amplitude, however the higher mids on the TH909 mean the perceived bass is lower than that of the TH900. The mid boost can also border into 'shouty' on some recordings, however these are wonderfully capable for EQing if you feel the desire to compensate: -Technical Performance- Measurements of these headphones are sparse, but they show excellent performance. Fostex’ Biodynia diaphragm has always shown exceptionally low distortion (trivial), but the 909's new dual layer open grille has done an excellent job retaining the phase information for the listener. Phase refers to the relative maxima and minima of a particular frequency waveform. Humans use the phase information in sound to understand positioning data of the sources - generally the phasing will correspond to the time of arrival which we are evolved to be very sensitive to. A uniform phase response in a speaker means that the transducer won't add spatial coloration, and instruments will be tightly resolvable in a good recording. These TH909 exhibit phase uniformity within about 10 degrees, which is very impressive for a dynamic transducer. Compare this to about 20 degrees for the Sennheiser HD800s, and about 50 degrees for the Focal Utopia - similar open backed flag ship cans. This is particularly impressive given how low impedance the Fostex 909's are - 300 ohms for the 800s, 85 ohms for the Utopia and only 25 ohms on the 909. Phase uniformity can generally be improved by using a thicker copper coil (higher impedance, more resistance relative to the parasitics). The Beyerdynamic DT880 has excellent phase uniformity in its 600 ohm version for instance, but quite a bit of variation in 32 ohms. [Check out Tyl's measurements at Innerfidelity and also Brent Butterworth's at SoundStrageNetwork for the 909 measurements] -Amplification- A great deal of speculation surrounds the pairing of these with different amplifiers, and they do present a challenge to conventional audiophile 'wisdom' in this respect. As audiophiles, we are unfortunately largely drawn to higher power output when it comes to amplifiers. Many audiophile dynamics are indeed high impedance (see above rant on phase), so generally this trend is OK, but for a low impedance like the TH909 this actually poses quite a challenge for an amplifier. Amps feed current to the headphone, the level of which will depend on the impedance of the headphone and the power rating of the amp. A high impedance load means that not much current is required from the amp to deliver its power rating. A low impedance however, will draw tons of current (if you follow the trend to zero, you are essentially approaching a short circuit), which risks over-saturating otherwise mighty high powered amps. A low impedance like the 909 risks oversaturating the amp, but it will also present this scenario in a particularly unflattering way. The harmonic distortion that this introduces in the source signal are emphasized by their relatively bright high frequencies. With this in mind, when it comes to amping these - less is more for power rating. Fostex themselves sell several nice options (I have been feeding these and my TH900's from the HPA-4BL pictured), but I have also found my lean little IFI nano Black Label sing nicely. In contrast, I keep my THX for high impedance / less sensitive loads. -The bottom line- Frequency response wise these may not work as a jack of all trades, their performance is such that you can EQ them into just about anything you want while retaining transparency. I for one, really like the signature. Highly recommended!

### ⭐⭐⭐⭐⭐ Great headphones
*by C***R on January 10, 2021*

These are great headphones. They look beautiful and they are very comfortable. Compared to the Audeze LCD-MX4, which is what I have been using, the most obvious difference is the much more prominent bass.

### ⭐⭐⭐⭐⭐ Good, very good sound and stage
*by L***S on July 11, 2023*

Was choosing between HD800 and TH909. After testing both, decided for the 909s

## Frequently Bought Together

- Fostex TH-909 Premium Open-Back Stereo Headphones
- FSIjiangyi 4.4mm Male to 2.5mm Female Balanced Adapter OfC Silver 8-Strand 19-Core Adapter Cable Suitable for Connecting 4.4mm Jack Audio Player, MP3 Player
- Geekria 4.4mm Male to 3.5mm (1/8'') Balanced Female Headphones Adapter for 3.5mm 4-Pole Cable Connected to Balanced 4.4mm Player Device, Aluminum Alloy Conversion Audio Plug, Gold Plated Adapter

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*Product available on Desertcart Greece*
*Store origin: GR*
*Last updated: 2026-08-25*