After releasing firmware 5.0 in 2022, we’ve been improving Nimitra internally and apply newer changes and improvements over the years until it reaches maturity stage to make it official. Today is the day we can announce official firmware 6.0 update.
Version 6.0 will cover major improvements based on Erawan flagship streamer that can be applied into Nimitra product. Firmware 5.0 was biggest improvement but 6.0 is now bigger with overhaul optimizations and improvements as below.
Windows Server 2025 Sound Quality Optimizations
After being impressed with sound quality from Windows Server 2022 for the first time enough to put onto Nimitra firmware 5.0, Windows Server 2025 made further improvements and changes are tailored for Nimitra to bring streaming closer to real sound.
Erawan was launched in the same month as Windows Server 2025 being released officially so we have been working closely with 24H2 codebase since the first beta. We’ve been optimizing Erawan until last week before making local launch in November 2025.
It’s quite fortunate for Nimitra that changes from Windows Server 2025 can blend smoothly with NimitraOS optimizations making Nimitra Classic and Nimitra2 sounding a lot closer to Erawan at much more affordable price point.
Universal Core Isolation Policy and Playback Optimizations
When firmware 5.0 was released, it was mainly for Roon optimizations at first and we put JRiver improvements during last minute before official launch. After Roon failing to meet our expectations, we started working on universal optimizations.
We work closely with developers who are our partners like Audirvana to bring the most satisfying experience to our clients with optimizations on Nimitra. The change of direction to universal approach will optimize all audio applications.
Core Isolation Policy:
Single core (Recommended for low latency audio playback)
Dual cores (Recommended for high buffering audio playback)
No isolation (Disabled)
Playback Optimizations:
Standard optimizations (Default recommendation)
Enhanced optimizations (Improve playback performance)
Max optimizations (Full real-time process optimizations)
Safe optimizations (Improve Roon’s reliability)
Extra-safe optimizations (Fail-safe optimizations)
No optimizations (Disabled)
Default configuration will use dual core isolation and standard optimizations now to maintain good synergy and reliability with most devices. Customers can also request for optimal configuration for their system to get the best sound quality possible.
Improved reliability with Roon/JRiver Optimizations
After releasing firmware 5.0, we noticed a few unusual issues with Roon and JRiver software used in Nimitra and added workaround to resolve the following cases as below.
- Roon keeps eating up space after applying a few updates so all temporary files will be cleaned up before loading Roon on startup
- JRiver has occasional issues with USB audio not being responsive due to having pause on audio playback so it will stop after a long pause
Firmware 6.0 will address these issues and keep Nimitra stable with unusual cases but we do care enough to bring the best music experience.
Improved internal system and application optimizations
There’s a lot of internal system and application optimizations in firmware 6.0 to further improve audio performance in this release. Even Airplay now will bring outstanding audio performance and some application files are updated to more recent version.
More unused features in audio platform and operating system are disabled to further reduce interference in system and bring inner fidelity of streaming to the next level along with improved internal system optimizations.
Improved quality of life improvements based on ErawanOS
After releasing Erawan, there’re a few changes being requested by clients and store vendors to bring to Nimitra too. For example, changing track with JPLAY in Erawan will have smooth fade out before playing a new track. This is implemented in firmware 6.0 too.
Some other unique optimizations from Erawan are also implemented on Nimitra such as disabling core parking and USB’s power saving features so Nimitra will improved sound quality and user experience being more similar to Erawan for what Nimitra can achieve.
Changelog
-Added Audirvana/Spotify/Tidal/Qobuz applications support into NimitraOS optimization platform
-Added I/O priority optimization on Audirvana/CoreAudio engine/Roon/Windows Audio
-Added JRiver’s memory playback mode decoding file into memory before playback
-Added temporary files cleaning process to maintain product’s reliability over time
-Added Windows Server 2025 sound quality optimization into NimitraOS
-Changed JRiver’s latency optimizations to Core latency optimizations supporting FidelizerRemote / uPNP / OpenHome / LMS
-Disabled Cloud content delivery that may download over time and cause “Get even more out of Windows” screen
-Disabled CPU core parking and USB’s power saving features
-Disabled un-used features in core streaming platform to improve performance (can re-enable requested feature via remote support)
-Extended core isolation and playback optimizations to all supported features including Audirvana and HQPlayer NAA endpoint not just Roon
-Improved .NET runtime optimizations for better performance and reliability
-Improved compatibility with JPLAY iOS app
-Improved disabling Windows Update in more cases (Windows Update can affect sonic performance and remove optimizations)
-Improved internal sound quality optimizations for NimitraOS 2.0 platform
-Improved optimizations on WDM audio performance (DirectSound, Airplay, audio in browser, etc.)
-Improved reliability of automate library files scanning
-Improved reliability of Roon updates
-Improved reliability of uPNP / OpenHome / LMS features
-Improved reliability with JPLAY iOS app in some cases
-Improved Roon Isolation Policy optimizations for better sound quality and stability
-Improved Roon performance by cleaning temp/cache before running RoonServer
-Improved startup optimizations for better sound quality and reliability
-Optimized Airplay streaming quality to improve audio performance
-Optimized core streaming platform’s audio output buffering to improve compatibility with JPLAY streaming app
-Optimized default configuration to improve performance and reliability with legacy USB DACs and USB storage playback
-Optimized remote support reliability to reduce its effect to audio processes without affecting performance
-Updated AirPlay platform binaries to stable version
-Updated core streaming platform to be recognized in streaming app as Nimitra endpoint
-Updated HQPlayer NAA binaries to version 5.1.5
-Updated OpenHome libraries to latest stable version
If you’re using Nimitra Classic, I’d like to inform that Nimitra Classic will be discontinued in future after successful launch of CoreStream streamer. So, you can upgrade your Nimitra Classic to Nimitra2 at $1,500 USD only.
Nimitra runs on specially tuned NimitraOS platform with special version of Fidelizer. All these optimizations are specially tuned for Nimitra’s hardware and software configuration, separated from Fidelizer software optimizations.
Nimitra Classic / Nimitra / NimitraS / Nimitra2 customers can send request for firmware update and I’ll update Nimitra firmware through remote or request download link for applying update manually.
