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CXM Technical

MANUAL

CS1 Stereo Music Module

2.01 This module contains RIAA equalised phono and line level amplifiers, sub-sonic

filter, equaliser, auxiliary sends, channel fader, crossfade assign, mono switch,

PFL select logic and remote start switch. Inputs are by way of gold plated RCA

phono sockets.

2.02 Input Amplifier Equalisation

Two input amplifiers are fitted. The RIAA equalised phono input has an input

impedance of 47kΩ, loaded with a capacitance of 220pF. The RIAA equalisation

is accurate to within ± 0.5dB 30Hz-20kHz. This input amplifier can be configured

internally with a 3 position jumper. The 3 input options are:

INPUT OPTION DESCRIPTION

RIAA For moving magnet cartridges.

Flat response @ 0dBu For CD players and other ancillaries with outputs

compatible with an input range of-12dBu to

+12dBu

Flat response @ -10dBu For low output ancillaries requiring an input range

of -22dBu to +2dBu. If this option is selected,

consider the possible risk of overload with

incorrect gain settings.

2.03 Input Specification

The line amplifier is unbalanced with an input impedance of 47kΩ and a nominal

input sensitivity of 0dBu.

2.04 Input Gain

The gain range for both input amplifiers is trimmed to ±12dB with reference to

the centre (unity gain) point of the gain control.

2.05 Input Select

The input select switch is positioned at the top of the module with LED status

indication. A provision to mark the fascia with input source details is adjacent.

2.06 Sub-Sonic Filter

A permanent sub-sonic filter attenuates signals below 20Hz at a rate of

18dB/oct. This filter is positioned pre-equalisation thus preventing sub-sonic

signals being boosted by the bass control.

2.07 Equalisation

The equaliser has 3 bands, each band having a defined range resulting in a

controlled response outside the audio spectrum. In addition, the range of boost

and cut can be internally configured to operate at ± 12dB or limited to ± 6dB by

simply reversing a single circuit jumper. A second jumper can be used to bypass

the equalisation (see drawing).

The HF control operates at 10kHz, mid at 1200Hz and LF at 50Hz, all 3 controls

have a centre detent for positive neutral setting.

Factory default settings are ± 6dB with equalisation in circuit.

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Cloud CXM User's Guide Page 6

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