The Denon DN - 300BR is a top - notch 1RU Bluetooth 4.0 audio receiver. It's a great addition to any professional audio system, offering wireless stereo Bluetooth audio connectivity. This receiver can store up to 8 Bluetooth devices in its internal memory. You can send audio from paired devices to a mixer, powered speakers, or an amplification system via balanced XLR and unbalanced RCA jacks. The included Bluetooth antenna can be placed on the front or rear panel for easy use and has a reception range of up to 100 ft (33m). It's perfect for retail stores, sports bars, educational institutions, and hotel/conference settings. There's also a Euroblock connection on the rear for a remote pairing button, very handy when the receiver is hard to reach. The front - mounted Output Level knob and Pairing/Status LEDs make it extremely user - friendly. Key features include: 1 RU rack - mount design, adding stereo Bluetooth 4.0 reception to any audio setup, remembering up to 8 devices, balanced XLR and unbalanced RCA outputs, a remote pairing button connection on the rear, and a BNC antenna input for the included Denon remote Bluetooth antenna. Technical specs: Frequency Response is 20 Hz - 18 kHz (-1dB), Signal - to - Noise Ratio is > 83dB (1 kHz, Unity), THD is < 0.33% (1 kHz, Unity), Channel Separation is < -68dB (1 kHz, Unity), balanced output level is +4 dBu, unbalanced output level is -10dBv. It has 2 XLR outputs, 1 RCA stereo output pair, and 1 IEC power cable input. It operates on 100 - 240 VAC, 50/60 Hz and consumes less than 2 W. Dimensions with rack ears are 19.0' x 10.7' x 1.7' (483 x 271 x 44mm), without rack ears are 17.1' x 10.7' x 1.7' (434 x 271 x 44mm), and it weighs 6.6 lbs (3.0 kg).

Using the Denon DN - 300BR is easy. First, connect the receiver to your audio system using the balanced XLR or unbalanced RCA outputs. You can place the included Bluetooth antenna on the front or rear panel for better reception. Pair your Bluetooth device with the receiver. The receiver can remember up to 8 devices, so you don't have to pair every time. If the receiver is in a hard - to - reach place, you can use the remote pairing button connected through the Euroblock on the rear. Adjust the output level using the front - mounted knob. When it comes to power, just plug in the IEC power cable, and it can work on 100 - 240 VAC, 50/60 Hz. As for maintenance, keep the receiver in a clean and dry place. Avoid exposing it to extreme temperatures or humidity. If there's dust on the receiver, use a soft, dry cloth to gently wipe it. Don't use any harsh chemicals or abrasive materials. Also, make sure the connections are tight to ensure good audio quality.