The HD4 speakers do include detachable magnetic grills. The grills have thin rubber pads to prevent marks or damage to the finish or the cabinet, so your HD4s will keep looking great even if you like to remove / replace them frequently!

Absolutely! The HD4 offers wired or wireless connections to any phone or tablet using the aux audio input or Bluetooth aptX-HD. For wired connections to newer devices without a headphone jack, you'll need the correct USB-A adapter cable to connect from your tablet to the USB input on the HD4. These are generally available from the manufacturer of your tablet/smartphone, local electronic stores, or even online retailers.

Yes, you can. The HD4 speakers use a switching power supply so it will automatically convert to the different voltage. The power cable is also detachable which makes it convenient to replace the AC plug with a different type if you don’t want to use an adapter plug.

Sure, for HD4 you will need an inverter that can supply about 50-60 watts.

While the HD4 has a fantastic 24-bit DAC, you can always run your own external DAC to the speakers by connecting to the analog inputs.

Some turntables will need a preamp before being connected and others may have one built-in. Check the turntable manufacturer’s website or user manual.

Yes! All Audioengine powered speakers have multiple audio inputs. Both analog inputs (3.5mm and RCA) are active, so you can connect multiple audio sources at the same time. 

The digital inputs are slightly different, though. Both the Bluetooth and USB inputs share an internal DAC. In this case, the Bluetooth input will take precedence over the USB connection. This means that the Bluetooth input will mute the USB input's audio playback. Simply disconnect your Bluetooth device from the HD4 speakers to resume playback from your USB source device.

You should be able to use multiple sources with the HD4s just fine. The analog inputs on the HD4 are always active. They will play at the same time as the Bluetooth or USB input. Bluetooth and USB share the DAC though, so you can only listen to one at a time, and Bluetooth takes priority. If you're using USB for example, and start using Bluetooth, USB will mute and Bluetooth will take over. If you pause or disconnect from Bluetooth the speakers will automatically switch back to USB after a few seconds.

Technically, yes. But thankfully, it won't really be noticeable! Bluetooth only has a delay of about 30ms (milliseconds). So for example, you can watch videos from apps like YouTube and stream the audio through your HD4 without any noticeable lag.

You would connect the variable output of the HD4 into the input of your sub using RCA cables.

The light on the front panel of the HD4 Wireless is the Bluetooth LED indicator. Below are the various Bluetooth LED statuses and their meanings.

• Bluetooth LED is on and solid: The HD4 Wireless has power and currently connected to a Bluetooth-enabled device.
• LED indicator illuminates orange instead of white: This is normal! It means that your source is currently sending the HD4 Wireless an aptX signal.
• Bluetooth LED is on and blinking: The HD4 Wireless has power and the Bluetooth receiver is in pairing mode.
• Bluetooth LED is off and HD4 Wireless is on: Bluetooth is in standby and not in pairing mode. However, the HD4 Wireless is still visible to your device, so simply connect using your device and it will automatically wake up.

The devices on TIDAL’s website are network media servers with the TIDAL app already  on their operating systems. That’s all. Thankfully, there is no difference in audio quality or anything else as compared to their downloadable app. The only difference is just that TIDAL comes pre-installed on those devices. There is one notable exception, though: If you're listening to TIDAL on a computer, then Google Chrome is the only web browser that supports its full audio quality.

Yes, but you've already completed the hard part! Simply open any app (Apple Music, Spotify, YouTube, etc.) on your source device. Then, you can play your music through Bluetooth once you've selected what you want to hear.