Transformers
APS audio transformers
Custom audio transformers
** We will not be accepting new orders from 11/01/2025
until the end of the year. We will resume orders on 1/1/2026.
New Bridge ready Limited Edition unit now available !
ONLY ONE BLACK UNIT AVALABLE BEFORE THE NEW YEAR.
*we will include a free bridge ii card with this unit.
*Just add the Bridge II upgrade to the Limited Edition Signature Series PLUS DAC
Our Signature Series PLUS on Steroids.
Limited number of units.
With an upgraded pure copper AC inlet, Silver input wiring, Our discrete 5 Volt regulator, A 50% larger pre regulator cap. Upgraded post regulator cap, Additional post regulator cap, Hand-picked transformers.
For the audiophile who demands the very best.
Unbelievable clarity, dynamics and realism.
*For a limited time: $ave 10% on upgrading your unit.
Note: We do not recommend using the USB input.
We also recommend the use of a preamp as the digital volume and attenuator also degrades the sound.
Bridge ready upgrade. We fixed issues when using the Bridge II network card.
Firmware for the MK2
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New Firmware for the MK2:
10/25/2025
For the ones who has a Directstream MK2 with our transformers installed. We have a firmware that makes a large improvement in the sound quality. Much more detail and a more realistic sound stage.
Download and unzip it to a USB thumb drive. The file name will be fpga_228_APSaudio.bin Note: you can unzip this file in your current USB thumb drive that contains the Mount Blue Sky fpga firmware if you want. That's what we do so you can select ether the blue sky or this new fpga file.
Insert the USB thumb drive in the DAC.
Go to the system menu (long press the menu button)(right button till you see system)(right button til you see load firmware)(enter)(scroll down till you see fpga1_228_APSaudio. Enter to load. Reboot.
In the menu info screen the fpga firmware will show as 228_massive
Give it a try and let us know what you think.
You can always go back to Mount Blue Sky fpga just load that firmware in the load firmware section instead f the new one.
This is just the fpga firmware and not the newest user interface firmware that blue sky firmware from PS Audio installed.
We are located in the Baltimore / Washington area
Payment by PayPal F&F