Overview
The RU-MLD4 is a four channel audio distribution amplifier. The input and all four outputs may be connected through the front-panel XLR jacks or on the rear panel detachable terminal blocks. The input accepts either a balanced microphone or line level signal. Each of the four outputs provides either a microphone or line level signal. Both the front-panel XLR connectors and the rear-panel terminals are active at all times.
The audio input is equipped with a rear-panel switch to select between MIC and LINE level. Two additional switches allow setting the MIC input for LO or HI gain and for enabling or disabling standard 24 Vdc phantom. The two microphone gain settings allow the connection of a wide variety of dynamic and condenser microphones. Each output is provided with a separate rear-panel switch to set the associated level to either MIC or LINE. Audio outputs are isolated from each other and may be wired balanced or unbalanced. Gain trim is provided on a front-panel control. An RDL Dual-led VU meter is provided above the gain trimmer. The meter is calibrated to indicate +4 dBu for outputs set to line level. The rear panel provides a detachable terminal block and a power input jack to connect 24 Vdc power. Each output of the RU-MLD4T is equipped with a studio-quality audio output transformer.
Features:
- Distribution Amplifier with Four Outputs
- Front Panel XLR Input / Output Jacks
- Detachable Input / Output Terminal Blocks
- Switch-selectable Mic or Line Input
- Switch-selectable Mic Gain and Phantom
- Gain Trim on Input
- Each Output Switch-selectable Mic or Line
Specifications
Inputs:
XLR(front); detachable term block(rear)
Input level (for +4 dBu output):
Switch-selectable (rear panel) MIC/LINE
Mic:
-48 dBu to -3 dBu (LO GAIN); -65 dBu to -20 dBu (HI GAIN)
Mic:
2 kΩ balanced, switchable 24 V phantom (IEC 61938: 2013)
Line:
> 10 kΩ balanced; may be connected unbalanced
Outputs (4):
XLR(front); detachable term block(rear)
Output level:
Switch-selectable (rear panel) MIC/LINE
Output Impedance:
150 Ω balanced
Gain Trim:
Front panel adjustable
Mic:
Off to 52 dB gain (LO GAIN); Off to 69 dB gain (HI GAIN)
Mic:
80 Hz to 50 kHz (± 0.75 dB); < 10 dB @ 20 Hz (integral high-pass filter)
Line:
15 Hz to 50 kHz (± 0.1 dB)
THD+N:
< 0.1% (Mic); < 0.005% (Line)
CMRR:
> 60 dB (Mic); > 50 dB (Line)
Residual Noise (below +4 dBu LINE output or -45 dBu MIC output):
Mic:
-79 dB (50dB Gain); -70 dB (Mic 60dB Gain)
Headroom:
> 20 dB (above +4 dBu LINE output)
Ambient Operating Environment:
0° C to 55° C
Power Requirement:
GROUND-REFERENCED, 24 Vdc @ 90 mA
Package Type:
Cardboard Box
Package Dimensions:
6 x 6 x 2.625 in.
Shipping Weight:
2.375 lbs.
Tariff code:
8543.70.9960
RDL Three-Year Limited Warranty
Installation of these products by the Purchaser shall constitute Purchaser’s acknowledgement and acceptance of the terms and
conditions for sale and of this warranty, and shall constitute the Purchaser’s determination of the suitability of this product for the
Purchaser’s intended application. Radio Design Labs, Inc., also referred to as RDL®, warrants to the Purchaser that products
manufactured by RDL are free from defects in material and workmanship. This warranty applies to the period of three years from the date
of shipment, except for component parts or products purchased from other sources and supplied by RDL. Such component parts or
products bear only the warranty of the manufacturer thereof in effect at the time of shipment to the Purchaser. RDL will, without charge,
and after written notice has been received and acknowledged by RDL, repair an RDL product if proved to be defective according to the
usage of the trade, when such equipment is received by RDL at the location it designates with shipment costs prepaid by the Purchaser.
RDL shall not be liable for any expense whether for repairs, replacements, material, service, or otherwise, incurred by the Purchaser or
modifications made by the Purchaser to the product. No equipment shall be deemed defective if it shall fail to operate in a normal or
proper manner due to exposure to excessive moisture in the atmosphere, excessive temperature extremes, improper environmental
cleanliness, or any other environment not consistent with the principles of good engineering practice. In no event shall RDL have any
liability for consequential damage or expense directly or indirectly arising from the use of the products, or any inability to use it either
separately or in combination with other equipment or materials, or from any other cause, whether used in accordance with instructions or
not. This warranty is void if equipment is altered in any way by other than RDL. RDL products are NOT intended for use in life support
appliances, devices, or systems. Use of RDL products in such applications is done solely at the liability of the reseller/installer and/or end
user. RDL reserves the right to change design parameters and specifications at any time without notice. The performance measurements
reflect the products at the time of printing. This warranty is in lieu of all others, either expressed or implied. No representative is authorized
to assume for RDL any other liability in connection with RDL products.
