The Versatile RU-MLD4 Audio Distribution Amplifier

15. May 2013 · Comments Off · Categories: Tips · Tags: ,

ru-mld4The RU-MLD4 is a multipurpose 1 X 4 mono Audio Distribution Amplifier with the flexibility, reliability and quality engineered into every RDL product.

The RU-MLD4 input and each of the four outputs are switch selectable between microphone and line-level. A user-adjustable front panel gain trimmer and RDL Dual-led VU meter are provided to simplify set-up. Connections may be made using the front panel XLRs or the rear panel detachable terminal blocks.

At microphone level, the input features switch-selectable 24 Vdc IEC phantom power and two adjustable gain settings (LO – Off to 52 dB Gain and HI – Off to 69 dB Gain) to accommodate a wide variety of dynamic or condenser microphones.

The adjustable gain range is Off to 20 dB when the input is used at line level.

Each of the four audio outputs is electronically isolated and may be configured as balanced or unbalanced at microphone or line levels. Optionally, transformer isolated outputs are available by ordering the RU-MLD4T.

Use it as a 1 X 4 Microphone Preamp/Distribution Amplifier with microphone and/or line outputs or a 1 X 4 Line Amp / DA with microphone and/or line outputs.

STICK-ON Mic Preamps – Which One do I need?

30. April 2013 · Comments Off · Categories: Tips · Tags: ,

RDL STM-1, STM-2 and STM-3 Microphone Preamplifiers all seem to look alike and indeed they do have some similarities:

GENERAL

  • Identical noise, distortion, frequency response, headroom and common mode rejection specifications.
  • Identical power requirements. 24 vdc @ 25 mA or 12 vdc with a 6 dB reduction in headroom.

INPUT

  • Balanced or unbalanced
  • Balanced input accepts dynamic or condenser microphones with impedances from 150 to 600 ohms.
  • Unbalanced input impedance of 5 k Ohms or dynamic HI-Z mics.
  • Allows the use of 4 or 8 ohm loudspeakers to be used as a microphone in monitoring and intercom applications.
  • Selectable 24 volt phantom power for condenser microphones.

Outputs

  • Balanced +4 dBu, unbalanced -10 dBv

So here are the Differences:

stm-1STM-1

  • Fixed gain of 50 dB
  • 1 unbalanced output
  • 1 balanced output which can be configured unbalanced
  • Used in applications where the mixer or amplifier being fed has plenty of gain adjustment

stm-2STM-2

  • Adjustable gain of 35 – 65 dB
  • 2 balanced outputs either or both of which can be configured unbalanced
  • Used in applications where the microphone has normal to high output sensitivity

stm-3STM-3

  • Adjustable gain of 45 – 75 dB
  • 2 balanced outputs either or both of which can be configured unbalanced
  • Used in applications where the microphone has low to normal output sensitivity or where higher levels are required

Multi-Purpose Dual High Gain Line Amplifiers In A Small Package

18. April 2013 · Comments Off · Categories: Tips · Tags: ,

RDL STA-2AThe RDL STA-2A is a versatile two channel, line-level audio preamplifier.  Broadcasters and integrators rely on its wideband frequency response, low noise and low distortion for tasks such as:

  • Conversion between balanced and unbalanced lines
  • Conversion between high and low impedance
  • Providing up to 24 dB of adjustable gain to low level signals or for long line transmission

Like most other active RDL products, the STA-2A input and output circuits are configured to allow any combination of balanced or unbalanced connections. High impedance inputs and low impedance outputs provide for interface with low or high impedance sources and loads. Gain on each channel is adjustable Unity +24 / -14 dB

It’s a STICK-ON. It will fit just about anyplace you need it!

Connectorized Unbalanced to Balanced Conversion for Stereo or 5.1 Surround

10. April 2013 · Comments Off · Categories: Tips · Tags: , , ,

fp-ubc2In conference rooms, auditoriums, arenas, stadiums and theater applications consumer (unbalanced) audio products often need to be interfaced with professional (balanced) audio gear. Adaptor cables and transformer products might provide an electrical interface, but they do not provide the gain necessary to bring the typical unbalanced -10 dBv (-8dBu) signal up to the +4 dBu standard that is commonly specified in many facilities.

fp-ubc6The fully connectorized RDL FP-UBC2 and FP-UBC6 provide high performance unbalanced to balanced conversion for two or six channels of line-level audio. Independent gain controls allow input levels of -20 dBV to -5 dBV to be output at +4 dBu. The output impedance of each channel allows driving low or high impedance loads. RCA inputs and XLR outputs provide for fast and positive connection.

The FP-UBC2 and FP-UBC6 both feature the low noise, low distortion and excellent headroom and crosstalk performance that are typical of RDL products.

RDL FLAT-PAK products are designed to be mounted quickly and easily. They can be screwed or bolted to any flat surface, or by using convenient optional accessories, they can be mounted to projector poles or DIN rails, as well as 19” or 10.4” rack rails.

Automatic Audio Ducking

02. April 2013 · Comments Off · Categories: Tips · Tags: ,

In audio, a Ducker is a device used for lowering the level of one audio source based on the presence of another audio source. Often used in paging systems to lower the level of background music during a page, duckers are also used for voiceovers in radio, television and film production.

st-vp2The RDL ST-VP2 Automatic Ducking Module is a two input device that normally passes program connected to the MUSIC input. When audio is sensed at the VOICE input the MUSIC input is immediately compressed and attenuated to a predetermined level. This attenuation is maintained as long as signal is present at the VOICE input. When VOICE signal is no longer present, the MUSIC source is automatically restored to its’ normal level and the VOICE input is completely turned off.

The MUSIC input of the ST-VP2 is equipped with an AGC/Compressor circuit to produce consistent audio levels despite varying input levels. During voice-over operation, sudden, loud music passages are controlled to prevent veiling of the voice message.

Four separate adjustments are available on the ST-VP2:

  • MUSIC Level
  • VOICE Level
  • MUSIC Fade Depth: 0 to -25 dB, or OFF
  • MUSIC Recovery Delay: 2 to 4 seconds

All adjustments are made with multi-turn trimmers. Level adjustments are aided by the inclusion of an LED indicator for each of the two line-level inputs.

For applications where manually controlled ducking is required, consider the ST-VP1 Voice Over / Paging Module.

Application Diagrams:

AN-2050

BASIC PAGING OVER BACKGROUND MUSIC
User-Controlled Voice-Over Paging with 70 V Amplification of BGM and Paging
AN-2050

AN-2080

PRIORITIZED PAGING
Automatic Ducking with Multiple Paging Locations
AN-2080

AN-2062

PRIORITIZED PAGING
Automatic Ducking with Multiple Paging Locations
AN-2062

AN-2064

KSU/PBX PAGING WITH BGM OVERRIDE
Paging System for Office Space with BGM Override
AN-2064

AN-2133

CLASSROOM SYSTEM WITH PRIORITIZED PAGING
Full-Featured “Green” Mixer Amp Integrates Two Paging Priorities
AN-2133

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