Each speaker is 6" (15.2 cm) x 4" (10.2 cm) x 5.25" (13.3 cm)

All Optical audio is considered a "fixed" output, meaning volume will not attenuate from the TV remote. If you have an HD5/HD6 you can use the Audioengine remote for this. Fo

Make sure to maximize your audio source volume/s connected to the N22 and lower the N22 volume dial to minimize naturally occurring noise floor that can come thru the speakers when amplifiers are turned up high. 

We take great pride in our products, and go through great lengths to ensure consistency and quality. For that reason, this item was randomly selected for an additional step of Quality Assurance.

The following troubleshooting tips can help diagnose and correct most concerns with the D1. We have attempted to make this list as comprehensive as possible. So, even though some of these may not apply to your issue, please still go through each one.

1. Restart your device and make sure the OS and all related apps are up-to-date.
2. Make sure the USB cable and audio cable connections to and from the D1P are complete, and verify that these cables are in working order by unplugging the cables and then reconnecting.  Try using the included USB cable if you are not already. If you’re using an Apple source with Lightning port, make sure the adapter cable is a certified Apple cable. 
3. Remove all other USB devices temporarily from your computer to see how this affects the D1P playback.  Audio over USB and bus powering a device can both be somewhat demanding.  USB ports can share a bus internally and can also share their bus with devices internally as well.  Because of this, some ports may not perform as well as others, so be sure to try each USB port one at a time.
4. If using Windows, uninstall the USB driver from your computer.  Then disconnect the USB cable to remove the D1Pfrom your computer and plug it back in to allow the driver to reinstall automatically.  You can find complete instructions from Microsoft on how to reinstall a plug-and-play device under Windows here.
5. If you are using an intel-based Mac, try a NVRAM/PRAM reset.  This resets the system configurations for some audio and video related things and can many times help clear up problems related to audio.  See Apple’s support page for information on how to do this. Also, be sure to check the App store to see if there's a newer version of Mac OS you could be running.
6. Try music with different bit depths and sample rates.  On a Mac these settings are under Applications --> Utilities --> Audio MIDI Setup.  Try using both 16-bit as well as 24-bit settings.
7. Experiment with using a different media player (iTunes, Songbird, Win Amp, Cog, etc.) and different audio file types (MP3, ALAC, FLAC, etc.).  And if your media library is located on an external drive or network attached storage (NAS), try playing audio files on your internal local hard-drive.
8. When using the optical input on your D1P, be sure that your source device (computer, TV, CD/DVD player, etc.) is set to PCM Stereo output and not Dolby Digital or DTS.
9. If you are using a wireless device with D1P, temporarily remove the wireless adapter from the setup and connect the D1P directly to the audio source.
10. If possible, try your D1P with a different device to see if something is causing an issue in the current setup.

No external power is required. The D1P has a minimal power draw and can be powered directly by your mobile device or computer, ensuring efficient operation without significant power consumption. If you do not have a computer close by and are using the optical, any 5v DC USB power supply will work.

The D1P supports a wide range of headphones, from 10-600 Ohms, accommodating nearly all audiophile-grade headphones.

The D1P gives priority to the optical input over USB when dual connected.

Ensure the toggle switch is set to the headphone output and not the line out. This common step is overlooked and is crucial for directing audio correctly.

Key components include a Savitech SA9312 USB, an ESS ES9219C DAC for superior audio decoding, and a Cirrus Logic CS8416 for optical input, ensuring premium performance and sound quality.

The Toslink digital optical input allows the D1P to accept PCM stereo streams from any optical source, like TVs, computers, and media servers, providing flexible and high-quality audio connectivity.

The D1P processes PCM digital audio up to 32 bits and a maximum sample rate of 384kHz. It also supports DSD playback up to DSD128, allowing for high-resolution audio playback.

Yes, the D1P has built-in MQA hardware to complete the final unfold of an MQA audio file, offering a crystal clear listening experience.