RDL HR-DDA4 DISTRIBUTION AMPLIFIER Audio, AES/EBU, S/PDIF, digital, 1x4, 110/75 ohms, optical

These convert balanced and unbalanced analogue line-level inputs and outputs to and from standard digital audio signals operating at up to 24-bit resolution and 192kHz sampling.

HR-ADC1 - Analogue to Digital

This has a choice of balanced and unbalanced stereo audio line-level inputs which is then converted to either AES/EBU, coaxial S/PDIF or AES-3ID digital signals. Operating at up to 24-bits resolution and 192kHz sampling, either internally-generated or locked to an external source of sync, the HR-ADC1 offers 'superior analogue performance', 'very low distortion', 'exceedingly low noise' and 'remarkably flat frequency response'

The front panel has two rotary controls to set the audio input levels and an array of LEDs for monitoring level. Two rows of twelve LEDs indicate left and right peak or VU average audio levels. The 0dB reference level of the meters may be set to -14, -16, -18 or -20dBFS. Audio peaks between -10dBFS and 0dBFS clipping are displayed separately by two further rows of six LEDs to the right, which are also used as menu LEDs when programming the settings with two adjacent push buttons. The peak display may be set to either flash or store the peak values. Flash duration settings provide for instantaneous, 1/3 second hold or 2/3 second hold. If the peak display is set to 'store' then the highest peak recorded remains displayed until the 'peak reset' button is pushed. A column of six LEDs indicate the internal sample rate; three more the resolution in bits. These are set by two dedicated push buttons. Another button, with associated LED, enables external sync, with another LED indicating 'external sync lock'. A final button switches power, and is equipped with an LED indicator.

The rear offers three connectors each for left and right audio inputs. RCA (phono) sockets provide unbalanced connections whilst either 3-pole female XLR connectors or detachable terminal block connectors may be used for the balanced inputs, which may be wired unbalanced. The digital audio output has three connectors; a 3-pole male XLR provides the balanced AES/EBU output, RCA (phono) and BNC connectors provide the S/PDIF and AES3ID outputs respectively. A switch selects which is used. A similar array of three connectors provides the external sync input, with a female XLR used for the AES/EBU balanced input. The connector used is selected automatically. Both a co-axial connector and a detachable terminal block are provided for connecting power.

Inputs: +4dBu nominal, +2dBu to +26dBu, 30kohms, balanced; -10dBV nominal; -11dBV to +11dBV, 30kohms, unbalanced. (For 0dBFS). Sync inputs: 110ohms, AES/EBU, transformer isolated; 75ohms, S/PDIF; 75ohms, AES-3ID. Sample rates: 44.1, 48, 88.2, 96, 176.4, 192kHz. Resolution: 16, 20 or 24 bits. Response: 10Hz- 20kHz +/- 0.125dB; 20Hz-20kHz +/- 0.05dB. Distortion: Better than -105dBFS THD+N, 0.0006%, 20Hz to 20KHz, internal sample rate. Crosstalk: Better than -115dB, 50-60Hz; -105dB, 15kHz. Noise: Better than -135dB, 10Hz-20kHz. Dynamic range: Better than 114dB, 24-bit resolution, unweighted. Outputs: 110ohms AES/EBU, transformer isolated; 75ohms S/PDIF; 75ohms AES-3ID. Power source: 24-33V DC, 300mA, ground-referenced. Dimensions: 43 x 206 x 116.6mm (h x l x d).

Included accessories: Instruction sheet, mounting screws. There is no AC power supply.
Optional accessories: Power adapter, 24V, see RDL Power Supplies; mounting hardware, see RDL Rack Mounting Adapters - Half-Rack.

HR-DAC1 - Digital to Analogue

This offers a choice of AES/EBU, coaxial or 0ptical S/PDIF or AES-3ID inputs, which is converted to stereo audio using high speed delta-sigma conversion, digital filtering and filtered wideband analogue circuitry to drive both balanced and unbalanced outputs. With operation up to 24 bits, 192kHz, the design's operating stability is achieved with RDL's proprietary 'Sure-Lok latch-up auto recovery'.

The front panel has two rotary controls to set the audio output levels, each with a pair of LEDs to indicate audio presence and audio level of +4dBu. A row of five LEDs indicate 'lock', the presence of a valid input, and which of four sample rates, 44.1, 48, 96, 192kHz have been detected. The power button is equipped with an LED indicator.

The rear offers three connectors each for left and right audio outputs. RCA (phono) sockets provide unbalanced connections whilst either 3-pole male XLR connectors or detachable terminal block connectors may be used for the balanced outputs, which may be wired unbalanced. The digital audio input has four connectors; a 3-pole male XLR provides the balanced AES/EBU output, a BNC connector provides the AES3ID output with both RCA (phono) and optical connections for S/P DIF. The connector used and sample rate is selected automatically. Both a co-axial connector and a detachable terminal block are provided for connecting power.

Inputs: 110ohms, AES/EBU, transformer isolated; 75ohms, S/PDIF; 75ohms, AES-3ID; S/PDIF optical. Sample rates: 32-192kHz. Resolution: 16-24 bits. Response: 10Hz-24kHz +/- 0.2dB, high impedance load. Distortion: Less than 0.002% THD+N, 20Hz-20KHz, below +22dBu. Crosstalk: Better than -100 dB, 5Hz-3kHz; -90dB, 3kHz- 20kHz. Phase: +/-0.15 degrees, 5Hz-20kHz, L to R, R to L. Noise: Better than -100dB 10Hz-20kHz, -120dBFS input, referred to +22dBu at 0dBFS; -110dB, locked to digital input, digital audio off, reference +22dBu at 0dBFS. Dynamic range: Better than 110dB, unweighted, 24-bit resolution. Outputs: +4dBu nominal, 150ohms, balanced; -10dBV nominal; -10dBV, unbalanced. Adjustable off to +24dBu (0 dBFS). Power source: 24-33V DC, 175mA, ground-referenced. Dimensions: 43 x 206 x 116.6mm (h x l x d).

Included accessories: Instruction sheet, mounting screws. There is no AC power supply.
Optional accessories: Power adapter, 24V, see RDL Power Supplies; mounting hardware, see RDL Rack Mounting Adapters - Half-Rack.

HR-UDC1 Universal Digital Audio Converter

This converts a digital audio signal between consumer and professional formats. Operating at up to 24-bit resolution and 192kHz sampling rate, It automatically detects a valid input on any of the four input sockets, S/PDIF optical, S/PDIF coaxial, AES-3ID or AES/EBU. The input is decoded, re-clocked and re-transmitted to the output. The output has a switch to select an AES/EBU, S/PDIF coaxial or AES-3ID output. LEDs display the digital audio format and sample-rate of a valid source received without any phase-lock or bit errors. RDL's proprietary 'Sure-Lok' auto recovery supervision monitors possible causes of latch-up and reinitiates digital signal-lock, bringing a 'high level of stability to digital audio signal distribution under the variety of conditions encountered in professional environments'.

The front panel has two LEDs to indicate the detected input format, S/PDIF or AES/EBU, and nine LEDs to show the detected sampling-rate from 32kHz to 192kHz. The power button has an associated LED to indicate power is present.

The rear has two groups of connectors, for input and output. Each group has RCA (phono), BNC and XLR connectors for S/PDIF, AES3iD and AES/EBU respectively, and an optical connector for S/P/DIF. The input connector in use is determined automatically, as is the sample-rate of the incoming feed. The output has a switch which selects the connector to be used. Both a co-axial connector and a detachable terminal block are provided for connecting power.

Inputs: 110ohms AES/EBU, transformer isolated; 75ohms S/PDIF; S/PDIF optical; 75ohms AES-3ID . Sample rates: 32-192kHz. Resolution: 16-24 bits. Outputs: As inputs. Power source: 24-33V DC, 50mA, ground-referenced. Dimensions: 43 x 206 x 116.6mm (h x l x d).

Included accessories: Instruction sheet, mounting screws. There is no AC power supply.
Optional accessories: Power adapter, 24V, see RDL Power Supplies; mounting hardware, see RDL Rack Mounting Adapters - Half-Rack.

The HR-MP2A and HR-MP2 dual microphone pre-amplifiers both have balanced inputs, independent controls for each channel, phantom powering, input pads, phase reverse switches, clipping indicators and balanced line-level outputs for each channel and a separate summed mono output of both channels. The two channels may be used in stereo or as two separate mono preamplifiers

RDL's HR series are 'Half-Rack' Series products with an 'all-metal chassis' which may be used free-standing, using the feet supplied. Each unit may be labelled by removing an end cap and sliding out a clear plastic cover, which can be slid back in to cover user’s labelling, much in the manner of standard designation strips. Two units may be mounted side-by-side in an optional 1U 19-inch rack adapter.

HR-MP2A

This model offers only 48V phantom power, and has fewer controls and connectors than the HR-MP2.

The front panel has is split into three sections. Two provide the controls for microphone one and two. Each contains a rotary gain control with associated clip LED, a push button to switch the input pad in and out and a phase reverse switch. The third section has a switch to turn phantom powering on and off and a power switch with LED indicator.

The rear panel has two groups of connectors, one for each channel. Each consists of a female XLR input, and a 6.35mm 3-pole jack socket with adjacent 3-pole detachable terminal block connector for the balanced line outputs. In addition there is a single detachable terminal block giving a balanced output of the mono sum of the two channels. Both a co-axial connector and a detachable terminal block are provided for connecting power.

Inputs: -56dBu to 0dBu, 1kohms balanced, maximum gain without pad, minimum gain with pad, for +4dBu output; more than +5dBu maximum, input pad disabled, +22dBu maximum, input pad enabled. Input pads: 15dB nominal. Phantom power: 48V phantom (IEC 1938: 1996-12). CMRR: 80dB, 50Hz- 5kHz. Gain trim: 20-60dB. Response: 10Hz-70kHz +/- 0.5 dB. Distortion and crosstalk: Below noise floor. Noise: Better than -85dB, 20Hz-20kHz, 40dB gain, 150ohms source, below +4dBu output; -70dB, 60dB gain. Outputs: +4dBu balanced, -4dBV unbalanced, +24dBu maximum balanced, 150ohms. Power source: 24-33V DC, 165mA, 190mA with phantom, ground-referenced. Dimensions: 43 x 206 x 116.6mm (h x l x d).
Included accessories: Instruction sheet, mounting screws. There is no AC power supply.
Optional accessories: Power adapter, 24V, see RDL Power Supplies; mounting hardware, see RDL Rack Mounting Adapters - Half-Rack.

HR-MP2

This has all the facilities of the HR-MP2A, with, in addition separately controlled phantom power voltage, 24V or 48V, and low-cut filters, 6dB/octave, 80Hz, for each channel. There are additional LEDs for level monitoring and extra XLR connectors for the channel outputs.

The front panel has the same controls as the HR-MP2A with, in addition, for each channel, the following: A low-cut filter switch, two LEDs to indicate signal presence and +4dBu output level and a phantom power voltage switch to select either 24V or 48V phantom power.

The rear panel offers the same connections as the HR-MP2A with, for each channel, an additional female XLR connector for the line outputs.

Specifications: As the HR-MP2A except the following. Phantom power: 24V or 48V phantom (IEC 1938: 1996-12). Response: 10Hz-70kHz +/- 0.5 dB, flat; -3dB at 80Hz, low-cut filter enabled. Power source: 24-33V DC, 50mA, 200mA with phantom, ground-referenced.

Accessories: As the HR-MP2A

HR-MCP2 Dual Microphone Compressor

This dual mic compressor has two independent balanced microphone input channels with user control for 6dB/octave 80Hz low-cut filter, 15dB pad attenuation to give +5dBu to +20dBu input level, and gain control to offer adjustment from 20dB to 60dB.

The front panel houses all controllers and includes 3dB incremental, 7-stage LED meters on both channels to illustrate the gain reduction level. Each channel also has a clip LED that illuminates is a signal peak is within 1dB of clipping.

The two inputs each have 3-pin XLR and detachable terminal connections with switchable +48V phantom power. Switchable mic/line-level output is also with balanced 3-pin XLR and detachable terminal connections.

Specifications: Input level: -60dBu to -20dBu, without input pad; -45dBu to -5dBu, with input pad. Maximum input level: over +5dBu, input pad off; +22dBu, input pad on. Input impedance: over 1.5kohm, balanced. Input pad: 15dB nominal. Output level: -45dBu, mic, nominal, into 600ohms; +4dBu, line, nominal, dynamic audio source; +1dBu, line, nominal, sine-wave producing 3dB compression. Gain trim: 20dB to 60dB. Frequency response: 10Hz to 25kHz. Dimensions: 43 x 206 x 116.6mm (H x L x D).

Accessories: HR-HRA1 10.4-inch Rack adapter, HR-RA2 19-inch Rack adapter.

HR-DSX4 Digital Audio Selector

This offers a means to select one of four digital audio sources to one output. Each input may be fed through one of three jacks connectors, S/PDIF optical, S/PDIF (or AES-3ID) coaxial or AES/EBU. Solid-state switching is used to select one of the four inputs. Operating up to 24-bit resolution, 192kHz sampling-rate, the selected input is decoded, re-clocked and transmitted through the output. Switching may be controlled locally or remotely; a remote control output is available from the selected input. RDL's proprietary 'Sure-Lok' auto recovery supervision monitors possible causes of latch-up and re-initiates digital signal-lock, to provide 'highly stable operation in the variety of conditions encountered in professional environments'.

The front panel has a switch to select remote or local control with an LED to indicate the mode. Four large buttons select which of the input sources is fed to the output, each with an LED to show which input is in use. Upon selecting a source, the LED lights if a valid input is present; otherwise it flashes. If the button for a selected source is pushed again, all inputs are turned off. The power button has an associated LED to indicate power is present.

The rear has five groups of connectors for four inputs and the outputs Each group has RCA (phono), optical and XLR connectors for S/PDIF coaxial, S/PDIF optical and AES/EBU connection respectively. The output XLR is male and a switch selects the appropriate output connector and any required electrical and data format conversion. The inputs have female XLR inputs. Each group of connectors also has a three-pole detachable terminal connector for remote control. Both a co-axial connector and a detachable terminal block are provided for connecting power.

In the remote control mode, inputs are selected by an external switch or open-collector closure to ground, per source, which may be momentary or continuous. When a source is selected, the unit provides a 50mA open-collector output for the selected input to control other equipment or modules. The remote control terminals associated with the output connectors provides the facility to turn off all inputs.

Inputs: 110ohms, AES/EBU, balanced, transformer isolated; 75ohms, S/PDIF; optical S/PDIF; 75ohms, AES-3ID. Sample rates: 32-192kHz. Resolution: 16 to 24 bits. Outputs: 110ohms, AES/EBU, transformer isolated; 75ohms, S/PDIF; 75ohms, AES-3ID. Power source: 24-33V DC, 50mA, ground-referenced. Dimensions: 43 x 206 x 116.6mm (h x l x d).

Included accessories: Instruction sheet, mounting screws. There is no AC power supply.
Optional accessories: Power adapter, 24V, see RDL Power Supplies; mounting hardware, see RDL Rack Mounting Adapters - Half-Rack.