• Feb 28 2017: AP1/2 firmware 1.36 released.
  • May 1 2015: Released PurePower MKII. Unlike the AP1/2 MKII, this is a smaller update with less impact on sound.
  • February 12 2015: Released Audiophilleo1/2 MKII with further refined sound. All Audiophilleo1/2 units with serials 02064 or greater are MKII with the following enhancements:
    - Enhanced USB power filtering for less dependency on USB cables and better sound with cheaper cables.
    - Ap1 MKII: increased VirtualCable to 12 levels (used to be 6), allowing for fine-tuning the sound.
    - Ap2 MKII: ap2 now uses the equivalent of VirtualCable level 1 (changed based on customer feedback for the ap1 VirtualCable feature).
    - Reduced power consumption
    - Enhanced ESD protection to prevent output stage failures
    - Miscellaneous layout changes to further improve electrical isolation
    - Ap2 SE can be special ordered. Please e-mail us at support@audiophilleo.com for details.
  • February 12 2015: Released Audiophilleo1/2 firmware 1.35 and PurePower firmware 1.15 with several improvements including MKII support.
  • August 21 2014: Released Audiophilleo1/2 firmware 1.33.
  • September 14 2013: Added a review by John Grandberg.
  • September 12 2013: Released Audiophilleo1/2 windows device driver 1.16 with increased reliability, better jplay support, and 384KHz support for audiophilleo1 SE.
  • July 11 2013: Audiophilleo1 Special Edition (SE) supporting 384 Khz SPDIF and DSD128 over DoP output is now available as a $150 upgrade.
  • June 10 2013: Released new Audiophilleo2 retail packaging.
  • Jan 24 2013: Audiophilleo launches OEM partnership program, offering the only combined USB and GUI (graphical user interface) design on the market - all running on a single low-power 1cm2 ARM processor and supporting 384 Khz on virtually all media platforms including Windows, OSX, iOS, Android, Linux, and Squeezebox Touch. If you are interested in a licensing or development partnership for your DAC or Amp, please e-mail us at partner@audiophilleo.com.
  • Jan 8 2013: Audiophilleo's best-in-class integrated graphical user interface and USB interface technology is licensed by NAIM for the just-released DAC-V1.



The Owner's Manual shows you how to take full advantage of all the advanced features in every Audiophilleo. And be sure to use the BitPerfect validation files to get peak performance from your system. You may also view YouTube videos, including "features and controls", "infrared remote control setup", "preamplifier controls", "PurePower integration", and "PurePower reboot".

Keep your Audiophilleo 1 or 2 up to date with the latest firmware and drivers.

  • Firmware V1.36.zip and release notes. Note: If you are running firmware 1.09 or below, you must first upgrade to firmware V1.10.zip.  See the manual for upgrade directions. Note that this update installs on your Audiophilleo 1 or 2 device and should therefore be done regardless of your computer type.
  • Windows custom device driver v1.16. This driver is signed, Windows Vista/7 32 and 64 bit compatible, supports DTS/AC3 for multichannel applications, and also supports hibernation. Note that for Apple computers and for Windows XP you do not need to install any driver so this download in not necessary.

In addition, the NAIM DAC-V1 is based on the Audiophilleo1 and the NAIM support page contains many useful documents on configuring various media player software. They can be found in the Manuals and Downloads section.



So that we may give you the best service, please register your device first, before contacting us for support. And making sure that the latest firmware and drivers are installed may well fix any issues you are experiencing.

And be sure to check out the FAQ below. It's quite likely that there's already an answer for your question!

Can't find the solution on your own? No problem. Please contact us via e-mail at support@audiophilleo.com and specify your serial number and model (ap1 or ap2, PurePower option),or feel free to call/text us at (703) 674-8165 (first dial 001 if calling from outside the USA).

Hours of operation: Monday to Friday 9:00 a.m.-6:00 p.m. EST (GMT-5). Closed Saturday and Sunday.

We're here to make sure you're really happy with your Audiophilleo!

Shipping address

ATTN: Philip Gruebele
1021 N Garfield St Suite 942
Arlington, Virginia 22201, USA

Phone/text: (703) 674-8165
(first dial 001 if calling from outside the USA)

Please be sure to contact support@audiophilleo.com for a return authorization number before returning any products.

Dealers: We'd like to hear from you!

Audiophilleos are selling briskly and making audio enthusiasts happy all around the world. Let your clients hear how well digital can sound.

If you have a store and an online presence, let's talk. Give us a call at (703) 674-8165 (first dial 001 if calling from outside the USA). You can also e-mail us at ussales@audiophilleo.com or intlsales@audiophilleo.com.

Frequently Asked Questions

Do Audiophilleo devices require burn-in to reach their peak performance?

Yes, customers have reported that burn-in of up to 200 hours can change the sound. We recommend streaming audio through the device for several days to reach peak performance.

Can USB cables affect the sound?

Yes, USB cables can help attenuate USB power noise. They can also reduce the amount of data-related or electromagnetic noise that could bleed into the power conductors. However, USB framing jitter doesn't affect Audiophilleo performance.

What causes occasional pops or clicks when playing audio?

There are usually two likely reasons: Older versions of the Audiophilleo firmware should be upgraded to the current version (see Downloads above). Also, computer power management BIOS or utilities can cause the computer to hang briefly, thereby preventing the USB audio stream from being sent to the Audiophilleo as expected. This can be solved by disabling all power optimization options in your BIOS or utilities that actively manage power settings. Once the problem goes away, you may then re-enable these power options as long as they don't cause any problems.

What is the maximum recommended USB cable length?

The maximum cable length for a passive USB cable is 5 meters. However, multiple 5 meter "USB 2.0 Active Exention Cables" can be used to extend the cable length to 10 or 15 meters (2 active 5 meter cables plus a passive 5 meter cable makes about 48 feet). Technically, up to about 4 of these extension cables can be chained together in order to create overall reach of about 25 meters (75 feet), but cable resistance and power loss could become a problem. So, for runs over 10m it's better to use an active USB hub on the cable segment connected to the Audiophilleo. Otherwise, low input voltage may cause the Audiophilleo to function erratically or not at all. There are many cable manufacturers such as Rosewill and Belkin that sell active extension cables for about $15.

I have an Audiophilleo1 and when the music hits very high levels (the topmost sound bar in the display), I hear clicks. Why?

This can happen if polarity is set to "-" by pushing left on the joystick while in the main screen. The computer's binary represenation of audio data is called two's complement. The largest negative number is one larger than the largest positive number, so it is not mathematically possible to change the sign of the number. This is what causes the clicks. It is recommended to change polarity to "+" for music that reaches maximum negative level. The Audiophilleo2 doesn't have this problem because it always uses positive polarity.

I have an Audiophilleo1 and pushing up/down on the joystick does not change the volume. Why?

This happens if the Audiophilleo1 is not the default output device. The joystick volume control is the same as pressing the volume keys on your keyboard and only changes the volume of the default audo device. You need to make the audiophilleo1 the default audio device.

Can I use an Android tablet with the Audiophilleo?

Yes. Android uses the Linux kernel which is supported. You just have to make sure that the Android version you are using has USB Audio capabilities built into the Kernel. All newer Samsung tablets and phones have this capability built-in.

Can I use a Logitech Squeezebox Touch with the Audiophilleo?

Yes, for details please see this thread. Setup only takes a few minutes and the ap1/ap2 can be powered directly from the Touch. Also, when using PurePower, you can plug the PP into the Touch and the AP into the PP.

Is it better to have a longer USB cable or longer S/PDIF cable when the computer is far from the DAC?

It is definitely better to have long USB cable runs instead of long S/PDIF cable runs. The S/PDIF cable carries the low jitter audio signal from which the DAC extracts its clock, and shorter cables help insure the highest accuracy.

Does the Audiophilleo's direct connection put too much stress on the DAC connector?

No. This has not been a problem for most Audiophilleo users. For direct connection, the USB cable hanging from the Audiophilleo may be the main source of stress, so if this is a concern, provide a support for the USB cable.

Can the Audiophilleo1 and Audiophilleo2 send DTS or DD to a surround receiver?

Yes. Under Windows this requires our custom driver because the default windows driver does not support surround sound formats.

What happens if I play 192 kHz audio with the standard Windows Vista/7 driver?

In some cases this may actually work, but in general this will cause clicks and pops in the audio, so the custom driver needs to be installed.

Why don't the 88.2 and 176.4 sample rates show up in the Windows control panel?

All versions of Windows have a bug which causes these sample rates to not be displayed even though they are available. This will happen with any audio device.

Under Windows XP, why does my DAC not produce any sound or show 176.4 or 192 kHz sample rates even for 44 kHz files?

Windows XP does not properly set the sample rate when using DirectSound. If you install ASIO4ALL, then players like JRMC and foobar will set the sample rate to that of your source files. With the Audiophilleo1, the setting "SPDIF->Advanced->Max 96 kHz" can be used to disable support for 176 and 192 rates. Note that Windows caches audio device capabilities, so for this change to become visible to XP, you need to follow the procedure "Uninstalling the driver".

How do I configure iTunes with Pure Music or Amarra properly?

You need to exit all media player software, and in the Audio Midi panel, you need to select 24 bit. This way Pure Music and Amarra can select all sample rates (16 bit is only supported up to 48 kHz for Windows XP and iPad compatibility)

How do I best configure ASIO4ALL with the audiophilleo?

In the ASIO4ALL configuration window , go to the advanced options, and set "Kernel Buffers" to 4 and "ASIO buffer size" to 2048.

How do I best burn in my audiophilleo?

Simply connect your adiophilleo so that you can play music. Then optionally turn off your DAC and continously loop an audio track. Customer feedback indicates that about 200 hours of burn-in settles the sound. With the ap1, you may enable the "Settings->SPDIF->Advanced->Burn-in" setting in order to enable burn-in without having to play music.

How long does the AP take to warm up?

The AP1&2 automatically power down after 30 minutes without playback. When starting to play music it takes about 10 minutes for the AP to warm up and sound its best.