CX261 MP3/ZONE MIXER Installation and User Guide
Contents Contents Technical Specifications............................... 14 General Specifications................................. 15 Safety Information......................................... 4 Safety Notes Regarding Installation........................ 4 Conformities................................................................ 4 Safety Considerations and Information................. 4 Location of Internal Jumpers and Connectors....................................................
Safety Information Safety Considerations and Information Safety Notes Regarding Installation The unit must be earthed. Ensure that the mains power supply provides an effective earth connection using a threewire termination. •• Do not expose the unit to water or moisture. •• Do not expose the unit to naked flames. •• Do not block or restrict any air vent. •• Do not operate the unit in ambient temperatures above 35 °C. •• Do not touch any part or terminal carrying the hazardous live symbol ( the unit.
General Description The Cloud CX261 is a 1U rack-mounting stereo audio mixer intended for use in multi-use areas where simple control of high-quality background music needs to be combined with a flexible range of paging options. The CX261 mixes any one of six stereo line inputs with one or two microphone inputs. Separate controls for music and mic levels are provided, and music source selection and level may be controlled remotely if wished.
8 1 3 10 11 6 9 2 5 4 7 fig.2: CX261 Front panel Front Panel Description 1 MUSIC SOURCE – selects one of Music inputs L1 to L6 7 SIGNAL INDICATOR – 3 LEDs (green/yellow/red) indicating level of MP3 input 2 MUSIC LEVEL – adjusts level of selected Music input 8 MIC 1 LEVEL – adjusts level of Mic input 1 3 LOCAL/REMOTE LED – indicates (green) when remote source selection is enabled 9 MIC 2 LEVEL – adjusts level of Mic input 2 4 MP3 IN – 3.
Music Inputs 1 The unit has six stereo line inputs; these inputs are suitable for most music sources such as compact disc players, tape players, satellite receivers and the like. If connecting a mono music source, both L and R inputs should be wired in parallel (the exception being when using the CX261 in mono mode – see page 7, Mono Operation). 2 3 RSL-6 CONNECTOR RSL-6 (or RL-1) 1 2 3 All inputs are unbalanced and use RCA phono sockets. The input impedance is 48 kΩ.
Music Limiter The music channel of the CX261 incorporates a limiter circuit to help prevent inadvertent overloading of subsequent power amplifier input stages and ultimately, the installed loudspeakers. The limiter has no external controls. If the music input gain and level controls are set correctly, the limiter action should be inaudible on normal programme material, with no compression artefacts.
Microphone Inputs with the music channel (priority settings permitting) via an adjustable EQ section. Two microphone inputs are provided; the microphone preamplifiers are an electronically balanced, transformer-less design configured for optimum low noise performance. The input impedance is greater than 2 kΩ and is suitable for microphones in the 200 Ω to 600 Ω range. The two pre-set EQ controls ( 7 on fig.
Microphone Priorities The microphone inputs on the CX261 may be configured so that when they are in use, they take priority over the music programme; additionally, Mic input 1 may be set to take priority over Mic input 2. There are two methods of triggering the microphone priority circuitry: signal detection (AVO) or via the zone access contacts on the rear panel (ACC). The choice is made by internal jumpers J11 (Mic input 1) and J12 (Mic input 2); note the two mic inputs may be set differently if wished.
Main Outputs Auxiliary/MOH Output The main LEFT and RIGHT outputs on the CX261 are electronically balanced and can operate into loads down to 1.2 kΩ. The nominal output level is 0 dBu (775 mVrms) but the mixer can drive a maximum output level of +20 dBu (7.75 Vrms). The MOH (Music On Hold), or auxiliary output, provides a transformer-isolated L+R mono sum of the music channel. This is intended to provide a continuous music feed for use with a telephone system.
In either case no microphone signals are present at the auxiliary/MOH output, thus announcements made via the microphone inputs do NOT interrupt music programme at this output, regardless of any priority settings. Music Mute (Fire Alarm Interface) Note that the Music Mute function only mutes the CX261’s main outputs; the auxiliary/MOH output remains active.
General Notes EMC Considerations The CX261 fully conforms to the relevant electromagnetic compatibility (EMC) standards and is technically well behaved. You should experience no problems interfacing units to other items of equipment and under normal circumstances, no special precautions need to be taken.
Technical Specifications Line Inputs Specifications Frequency Response Distortion Sensitivity Input Gain Control Input Impedance Headroom Noise (rms) Equalisation 20 Hz-20 kHz, ±0.5 dB <0.05% typical, 1 kHz 0.775 V (0 dBu), ±12 dB 24 dB range 48 kΩ >20 dB -88 dB rms typical, 20 Hz-22 kHz LF: ±10 dB 50 Hz, HF: ±10 dB 10 kHz MP3 Input Specifications Frequency Response Distortion Sensitivity Gain Adjustment 20 Hz – 20 kHz, ±0.5 dB <0.
General Specifications Specifications Power Input Fuse Rating Fuse Type Dimensions (mm, W x H x D) Weight (kg) 230 V ±10% T100 mA 230V 20 mm x 5 mm 250 V 482.6 x 44 (1U) x 152.5 2.15 Location of Internal Jumpers and Connectors. J9 J7 J6 J2 SUB-BOARD SUB-BOARD J1 J8 J14 J5B J5A BOSE® EQ MODULE CONNECTOR RIGHT CHANNEL J4 BOSE ® EQ MODULE CONNECTOR LEFT CHANNEL J3 J15 fig. 12: Jumper and connector details J11 J13 J12 J16 J10 FRONT OF UNIT CX261 User Manual v1.
Factory Default Jumper Settings JUMPER FUNCTION J1 MIC 1 phantom power J2 MIC 2 phantom power J3 L6 priority release time J4 Mono/stereo operation J5 (A&B)* L6 priority (left & right) J6 MIC 1 access bypass J7 MIC 2 access bypass J8 MOH source select J9 Music Mute configuration J10 MIC 1 over MIC 2 priority J11 MIC 1 priority trigger J12 MIC 2 priority trigger J13 Mic over music priority J14 REM mode source selection J15 Music limiter threshold J16 TEL input impedance * J5A
Notes CX261 User Manual v1.
CX261 User Manual v1.
Bose® is a registered trademark of The Bose Corporation. In the interest of continuing improvements Cloud Electronics Limited reserves the right to alter specifications without prior notice. CX261 User Manual v1.
Cloud Electronics Limited 140 Staniforth Road Sheffield S9 3HF England Tel: +44 (0)114 244 7051 Fax: +44 (0)114 242 5462 email: info@cloud.co.uk web: www.cloud.co.
