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Summary of Contents for Nexo NX241
- Page 1 NX241 DIGITAL TDcontroller User Manual...
- Page 2 Norms Norms Norms Norms This equipment has been tested and found to comply with the following European and international Standards for electromagnetic Compatibility and electrical Safety: • Electrical safety CEI65 • Radiated emission EN55022 • Conduction emissions EN55022 • ESD tests: EN61000-4-2. •...
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Page 3: Table Of Contents
1/24 PAGE NEXO NX241 DIGITAL TDCONTROLLER QUICK START TABLE OF CONTENT TABLE OF CONTENT TABLE OF CONTENT TABLE OF CONTENT QUICK START LIST OF SUPPORTED SET-UPS GENERAL DESCRIPTION RONT ANEL ANEL ONFIGURATION & F QUALISATION ILTERING & P ELAY OLARITY INVERSION... -
Page 4: Quick Start
This section contains a summary of most frequently asked questions by people who haven't read the manual. You may be able to use the NX241 TDcontroller quite quickly as it has been designed to be user friendly. However please devote some attention to reading this manual. -
Page 5: List Of Supported Set-Ups
List of Supported presets (LOAD1_80) At the time of printing, the following factory presets are supported by LOAD 1_80. Please refer to the release notes if the software loaded in your NX241 is not LOAD 1_80. Alpha Family ALPHATD B1+M3... -
Page 8: General Description
6/24 PAGE GENERAL DESCRIPTION Configuration Global architecture is based upon a full 24 bit audio path with 48-bit core calculator running at 100 Million Instructions per Second. Featuring: 2 analogue inputs (balanced) 24 bit resolution ADC 4 analogue outputs (balanced) 24 bit resolution DAC 4 sense inputs (unbalanced) 18 bit resolution ADC Set-up configurations possible: STEREO PASSIVE MODE WITH (or Without) MONO SUB (2 independent passive cabinets) -
Page 9: Equalisation & Filtering
7/24 PAGE GENERAL DESCRIPTION ACTIVE 3 WAY plus AUX SUB on INPUT B STEREO ACTIVE 2 WAY LF L LF R HF L HF R Equalisation & Filtering Subsonic and VHF filtering Low and high-pass filters are used to filter out frequency components that could possibly degrade the performance of the TDcontroller and amplifiers. -
Page 10: Delay & Polarity Inversion
User set-up, Array EQ A basic Array EQ is currently implanted in the NX241. The cut off frequency of a Low-shelving filter is factory tuned for each cabinet setup. The user has access to the gain of this filter. Some more sophisticated User EQ is currently under development. -
Page 11: General Functions
The output will deliver a full-scale output of +28dBu(balanced 600Ω / 1nF load.) During A/C power up of the NX241, all outputs are muted by firmware-controlled relays (strapping pin 2 and pin 3 of each output). - Page 12 10/24 PAGE GENERAL DESCRIPTION Amplifier gain evaluation This is used to determine the actual gain of the amp, and adjust for possible temperature drift, amplifier input potentiometer adjustment or failure of this amp. This value is then compared to the user-supplied nominal value and used for the displacement and temperature protection.
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Page 13: Menu - User Utilities
Main Family Selection Changing Cabinet Family In order to prevent end-user changing between different NEXO system set-ups during use, the following procedure is obligatory. This procedure has been purposely designed to avoid any mistake. It is nevertheless very easy to change set-up among the same family (see menu 3) Simultaneously depressing A &... -
Page 14: User Settings
12/24 PAGE MENU - USER UTILITIES User settings 1.1 HEADROOM Allows the user to adjust the headroom (4 steps -6, 0, +6, +12) before the A/D converter without changing the overall gain of the processor. Factory default is set to maximum headroom (and so, maximum noise). - Page 15 13/24 PAGE MENU - USER UTILITIES 1.5 SAVE Set-up It is possible to store and recall up to 10 user set-ups (including EARTH LIFT) but excluding MUTE. Additionally the current set-up is saved in case of power failure every two minutes after the last change. At power up this set-up is restored.
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Page 16: System Settings
"unit locked" and "Change password. The factory default password is NEXO. This allows you also to get into an INSTALLER menu. Please contact your NEXO dealer if access required. 2.3 Earth Lift [CHASSIS LINKED / CHASSIS LIFTED] Earth Lift information is stored in the "user set-up" and "automatic save set-up". -
Page 17: Configuration Select
15/24 PAGE MENU - USER UTILITIES 2.6 AMP GAIN Adjustable from 20dB to 40dB nominal Amp Gain in 0.5dB steps for each channel. 2.7 AMP POWER Allows you to enter a Nominal Amp RMS power into 8ohms. Adjustable from 200 Watts to 5000 Watts in 50W steps for each channel. -
Page 18: Voltage Selection And Fuses
16/24 PAGE VOLTAGE SELECTION AND FUSES Voltage selection and fuses Precautions Please ensure that the unit is set for the correct voltage for your local supply BEFORE use. Operating voltage is indicated in the window of the main socket at the rear of the unit. Power connection Connection is made by means of an IEC standard power socket. -
Page 19: Download
Don’t care Don’t care Don’t care Don’t care The NEXO download software is DOS compatible and has been tested on the following operating systems: Microsoft MSDOS (V5.0 and above) DOS shell of Microsoft Windows 3.x DOS shell of Microsoft Windows 95 DOS shell of Microsoft Windows 98 Macintosh DOS compatible shell. -
Page 20: Instruction
COM port actually DOES work before trying again. You can also try re-booting your machine. 5) Now to complete the procedure, you must set the NX241 to "Download" mode to make it ready to accept the program. - Page 21 (leftmost mute). The controller will now enter "Download " mode and the download will start. The address of the code being loaded will be displayed on both the computer screen and the NX241 whilst the process is in operation. The download procedure is complete when the unit resets (all LED's on).
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Page 22: Protection Information Notes
20/24 PAGE PROTECTION INFORMATION NOTES Protection Information Notes Protection VCAs and VCEQs Each channel has its own simulation and protection process. Each audio channel contains a combination of controlled gain stages (let's call them VCA’s as in our analogue circuitry). These VCA's are embedded into complex composite structures in order to change their basic operation into frequency selective attenuation. - Page 23 The peak limiter primary function is to avoid massive clipping of the amp, which can have some very audible artefacts and in some cases may be dangerous for the Cabinets. (Modulation of the amplifier’s rails can create very low frequencies not filtered at all by the NX241 or some harmonics at high frequency and level…) The threshold of the peak limiter is determined by the user to match its amplifier.
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Page 24: Some Words On Amplifiers
Some words on Amplifiers Power NEXO recommends high power amplifiers in all cases. Budget constraints are the only reason to select lower power amplifiers. If an incident occurs on an installation without protection the fact that amps only generating half their rated output power (-3dB) are used will not change anything in respect of possible damage. -
Page 25: Gain Value
Gain value NEXO recommends low gain amplifiers: +26dB is recommended, as it is at the same time adequately low and quite common. This considerably improves signal to noise ratio and allows all preceding electronic gear, including the TDcontroller, to operate at optimum level. Remember that using a high gain amplifier will proportionally raise the noise floor level by the same amount. -
Page 26: Technical Specifications
Individual Mute/Solo buttons and red LED for each channel Amp. Sense & Peak (green & red) LED’s for each channel FLASH EPROM Upgrade for software improvement, new cabinet set-ups available on NEXO web site. Rear Panel 115/230 V switch Fuse holder RS232 connector for serial com. - Page 28 Tel: +33 1 48 63 19 14 Fax: +33 1 48 63 24 61 Email: info@nexo.fr FAR EAST NEXO USA Inc. NEXO limited NEXO Far East Ltd 2165 Francisco Blvd. 9 Lyon Road 101 Lorong, 23 Geyland Suite E2 Walton-on-Thames...
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