555-8485 MCM, 555-8485 Datasheet

Balanced/Unbalanced Line Level Converter

555-8485

Manufacturer Part Number

555-8485

Description

Balanced/Unbalanced Line Level Converter

Manufacturer

MCM

Datasheet

1.555-8485.pdf (2 pages)

Specifications of 555-8485

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Ch 1

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Ch 1 L/R Bal. XLR (F), Ch 2 L/R Unbal. RCA (F)

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The MCM Custom Audio Model 555-8454 Line Level Converter is an essential interface in

sound systems that utilize a combination of professional audio gear, with consumer home

theater equipment, PCs, laptops and portable MP

Anyone that has attempted to use commonly available RCA-to-XLR adaptors to send an RCA

line level output from a tape deck, CD or DVD player, into an XLR input of a pro-sound

amplifier or mixer, knows the problem of levels being too low.

This occurs for two reasons:

Conversely, when coming from the record output of a mixing console, or similar equipment, to

send to a consumer tape deck, computer sound card or VCR, the line level is often far to hot

to be usable.

The 555-8454 Line Level Converter incorporates four independent low noise audio amplifier

circuits, to provide two stereo audio channels.

Channel 1

Accepts L/R XLR balanced inputs, electronically converts them to two unbalanced channels,

and provides attenuated signal to L/R RCA outputs.

Channel 2

Accepts L/R RCA type unbalanced consumer line level inputs, electronically balances the

signal, amplifies it to pro-sound line level, and supplies it to two male XLR output connections.

Both channel 1 and 2 include level controls for fine adjustment of each pair.

•

“Line-level” signal level for consumer audio equipment is nominally -10dBV (0.32V

RMS). However, “line-level” signal level for pro-sound equipment is +4dBV (1.23V

RMS). Simply put, pro audio gear is looking for a 14dB higher signal level.

XLR inputs are “balanced”, in that the positive and negative components of the signal

are carried on two separate conductors (hence the use of 3-pin XLR connectors).

When using standard RCA to XLR adaptors, the line level signal is supplied only to the

positive pin. The negative pin is either tied to ground or left open. This absence of half

of the component creates a -6dB signal deficit.

Balanced/Unbalanced Line Level Converter

Model 555-8485

Overview

players.

Related parts for 555-8485

555-8485 Summary of contents

Page 1

... Accepts L/R RCA type unbalanced consumer line level inputs, electronically balances the signal, amplifies it to pro-sound line level, and supplies it to two male XLR output connections. Both channel 1 and 2 include level controls for fine adjustment of each pair. Model 555-8485 Overview 3 players. ...

Page 2

... Frequency response: 20Hz~20KHz • S/N ratio: >90dB • Noise Floor: -88dB • THD: <0.003% • Power requirements: 12VDC, AC adaptor included • Dimensions: 1-3/4" (H) x 5-5/8" (W) x 3-5/8" (D) Operation -8dB +20dB 650 Congress Park Drive www.mcmelectronics.com MCM Custom Audio MCM Electronics Centerville, Ohio 45459 ...

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