Glensound Bella 4 4-Input 1RU Rackmount Audio Monitor

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The Bella 4 from Glensound is a confidence monitoring rack with four loudspeakers. It features the very latest technology in loudspeaker and amplifier design giving it an extended acoustic frequency range (compared to old legacy equivalent products) and low distortion.

The four loudspeakers are each fed from their own Dante (AES67 compliant) network audio input. Each channel has a front panel audio presence indicator, an input peak LED, and an illuminated channel mute switch. Front panel volume controls adjust the audio output of the speakers and the headphone circuit.

Modern Loudspeaker Drive Units
The drive units fitted in the Bella 4 were originally manufactured as full range drive units in flat screen televisions. They have ultra modern Neodymium magnets with reasonably low tesla magnetic induction properties.

Class D Amplifiers
Each loudspeaker is driven from a Class D amplifier. These amplifiers provide low distortion and low noise outputs. Four watts RMS is provided into each loudspeaker and the peak output is electronically limited to 5 watts.

Inbuilt Loudspeaker Protection
A compressor limiter circuit is provided to prevent overload and damage to the loudspeaker drivers by exceptionally high audio levels. One compressor/limiter is provided for each loudspeaker and they have been carefully designed not to taint the audio during normal operating levels.

Dante/AES67 Compliant Audio Inputs
Four network audio inputs can be routed from your Dante/ AES67 AoIP network to the Bella 4. The Bella 4 uses the Ultimo chipset from Audinate and can accept four audio inputs at 48k sampling or two at 96k sampling, all with up to 24-bit resolution.

Channel Mute Switch
Each channel has its own illuminated mute switch. This allows a quick and easy way for an operator to turn the audio off from one (or more) loudspeakers.

Presence & Peak LEDs
Presence LEDs are provided for each loudspeaker input. These LEDs illuminate when incoming audio is detected and this provides a helpful aid to an operator to know which audio circuit is currently active. Peak LEDs are also provided and these illuminate when the input level reaches a high level.

Headphone Output
A front panel 6.35mm TRS headphone jack is provided. If headphones are plugged in then the audio to the loudspeakers is automatically cut. The headphone output is stereo and it wired such that inputs 1 and 3 feed its left output, and 2 and 4 feed the right output channel.

Mains Power Supply
An internal switch mode mains power supply is fitted that is suitable for use Worldwide. The power input is via an industry standard filtered IEC plug.

High Acoustical Output
The modern loudspeaker drive units are capable of providing a high output SPL of 88dB from one loudspeaker (at 0.6 metres) or 98dB if all loudspeakers are driven coherently.

Best in Class Frequency Response
The loudspeaker design provides best-in-class frequency response from a four-way 1RU rack. The acoustical output is within +/- 9dB from 22kHz down to 120Hz. The flat midrange and extended LF provide a noticeable improvement in audio clarity.

• Network:
  • Physical Interface: 1 off RJ45 Neutrik Ethercon
  • Audio Sample Frequency: 48kS/s
  • Transfer Rate: 100 Mbps
  • Dante Chipset: Ultimo UXT-01-004 (Note: Audinate recommends no more than 10 Ultimo chipsets on one network UNLESS another Dante device such as the Brooklyn module (found in 8 channel Beatrice/ Dark units), is on the same network. The Audinate Ultimo chipset is AES67-compliant.)
• Audio - General:
  • Volume Control Gain Range: +10/ Off
  • Present Indicator Threshold: -18dB
  • Present Indicator Hold Time: 3 seconds
  • Peak LED Threshold: +10dB
• Audio - Headphones:
  • Connector: 6.35mm (1/4") TRS Jack Socket
  • Maximum Output Before Clipping: +18dB into 600 Ohms
  • Noise @ Lineup (22Hz to 22kHz RMS): > -88 dB
  • THD + N: > 0.0025% @1kHz ref +8dB
  • Headphone Impedance: 32 to 1000 Ohms
• Audio - Loudspeaker:
  • Maximum Power RMS: 4 Watts (per loudspeaker)
  • Peak Power (per loudspeaker): 5 Watts (limited by compressor circuit)
  • Amplifier Type: Class D
  • Noise @ Lineup (measured at I/P to LS): > -61.5dB
  • THD + N (measured at input to LS): > 0.18% @ 1kHz ref +8dB
  • Acoustic Frequency Response: 120Hz to 22kHz +/- 9dB
  • Maximum Acoustic Level (1 Loudspeaker): 88dB SPL @ 0.61 Meters (2 Feet)
  • Maximum Acoustic Level (4 Loudspeakers): 98dB SPL @ 0.61 Meters (2 feet)
  • Loudspeaker Magnet Type: Neodymium
  • Magnetic Induction: 1.15 T (per loudspeaker)
• Power:
  • Input Voltage: 100 - 240 VAC +/- 10%
  • Frequency: 50 / 60 Hz
  • Input Connector: Filtered IEC (internally fused)
  • Consumption: 25 Watts, maximum
• Environmental:
  • Operating Temperature: 32 to 122° F | 0 to +50° C
  • Storage Temperature: -4 to 158° F | -20 to +70° C
  • Relative Humidity: 0 to 95% non-condensing
• Physical:
  • Mechanics: All aluminium with laser etched panels and light textured black powder coated lid/ base
  • Size (H x W x D): 7.5 x 5 x 3.9 in | 190 x 128 x 100 mm
  • Weight: 4.2 lb | 1.35 Kg