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Operation Manual

I-Tech HD DriveCore Series

Power Amplifiers

page 56

13 LevelMAX

Limiter Suite

The I-Tech HD LevelMAX™ Limiter Suite features three types of limiting:

•

Peak

•

RMS

•

Transducer Thermal

and three modes of operation:

•

Auto

•

Advanced

•

Manual (OEM Factory Locked)

The standard i-Tech HD LevelMAX limiter panel (Advanced Mode) is shown

below:

LevelMAX has been designed to limit accurately to the specified voltage

thresholds. The addition of a thermal limiter allows thresholds for the

faster-acting RMS and peak limiters to be set higher, providing more output

and maintaining dynamic range before the onset of limiting, while protecting

the long term integrity of the transducers.

In Auto or Advanced modes, turning on the LevelMAX Limiter Suite will

enable all three limiters: Peak, RMS and Thermal.

The three LevelMAX limiter types and operating modes are outlined in the

following sections.

Содержание DriveCore I-Tech 4x3500B HD

Страница 1: ...ormation provided in this manual was deemed accurate as of the publication date However updates to this information may have occurred To obtain the latest version of this manual please visit the Crown...

Страница 2: ...LE THE MAINS PLUG OF THE POWER SUPPLY CORD SHALL REMAIN READILY OPERABLE POUR D MONTER COMPL TEMENT L QUIPEMENT DE L ALIMENTATION G N RALE D MONTER LE C BLE D ALI MENTATION DE SON R CEPTACLE LA PRISE...

Страница 3: ...Use Part 2 Immunity EN 61000 4 2 2008 Ed 2 0 EMC Compatibility Product Family Standard for Audio Video Audio Visual and Entertainment Lighting Control Apparatus for Professional Use Part 2 Immunity E...

Страница 4: ...ply with PFC 51 11 3 6th Generation Class I Circuitry 51 11 4 Color Coded Rear Overlay 51 12 Appendix A Network and CobraNet Basics 52 12 1 HiQnet Networks 52 12 2 A Closer Look at CobraNet 52 13 Leve...

Страница 5: ...ing and recall DSP presets to reconfigure the amp for various applications Comprehensive array of indicators provide accurate diagnostics Power Data along with Ready Signal Clip Thermal and Fault for...

Страница 6: ...ely down counterclock wise Use a standard 19 inch 48 3 cm equipment rack EIA RS 310B See Figure 2 1 for ampli fier dimensions You may also stack amps without using a rack NOTE When transporting amplif...

Страница 7: ...t is over driven THE CHANNEL 2 AND 4 INPUT IS IGNORED by default in Bridge Mono mode It can be summed using the input source selector For additional information on audio input wiring please refer to t...

Страница 8: ...is up to the user to test this based on their use case The connections stated here are based on worst case analysis NOTE Custom wiring should only be performed by qualified per sonnel 2 3 3 Choose Ou...

Страница 9: ...eat for negative Repeat Channel 2 wiring as for Channel 1 To wire stereo speakers to the Speakon connectors use this method 2 Setup Figure 2 10 Wiring Two Stereo Speakers to the Top Speakon Connector...

Страница 10: ...n input signal to the amplifier Figure 2 11 Connect an analog signal source to the Channel 1 and or Channel 3 amplifier input Connect an AES EBU digital signal source to the Digital Input IN connector...

Страница 11: ...ss weight benefits the consumer by reducing shipping costs and benefits the environment by reducing emissions from vehicles because the shipper is able to either reduce the amount of vehicles needed t...

Страница 12: ...development of this technology resulting in truly remarkable benefits DriveCore Technology provides an extremely wide tolerance with regards to sagging or dirty AC line conditions providing consistent...

Страница 13: ...g using your IPhone or IPad anywhere in the venue intuitive control panels allow you to monitor input levels output levels thermal conditions anything you need Need to limit control or see something s...

Страница 14: ...amplifier High level low frequency signals from breath pops or dropped micro phones can blow out drivers To prevent subsonic signals use one of these methods Insert a highpass filter between mixer ou...

Страница 15: ...eaches the onset of audible clipping The Clip Indicator also will illuminate dur ing Thermal Level Control TLC limiting The Clip Indicator can be turned off during Blackout mode H Level Control Encode...

Страница 16: ...urrent 60A color coded binding posts Accepts banana plugs wire or spade lugs E Power Cord Connector 32 amp PowerCon AC Inlet Voltage range is indicated above IEC inlet F Reset Switch Circuit Breaker I...

Страница 17: ...ype Manufacturing Information ADVANCED MENU Attenuator Limits Attenuator Link Input Source Priorities Ch 1 Input Source Priorities Ch 2 Input Source Priorities Ch 3 Input Source Priorities Ch 4 Maximu...

Страница 18: ...lock or unlock the menu with the front panel buttons press Next and Prev simultaneously To lock or unlock the menu with System Architect software go to the Tools Menu Display Screen Security and press...

Страница 19: ...atch the Cobranet source Analog Input Sensitivity Tap to select a channel turn the encoder to adj This screen also displays the amp gain for each channel resulting from the sensitivity settings Note I...

Страница 20: ...Touch the screen to select 21 dBu or 15 dBu Note Changing this value changes the range of sensitivities available to the amplifier For more information see Figure 7 3 and the I Tech Sensitivity Chart...

Страница 21: ...tance in feet and meters For example 10 ms is the signal delay of sound traveling 11 3 feet or 3 4 m Output Polarity Press each channel icon to toggle the output signal polarity between and Bandpass G...

Страница 22: ...f the LCD backlight and all front panel LEDs except for the fault LEDs and power switch green LED After blackout is enabled an Encoder press turn will reactivate the display If no button is pressed tu...

Страница 23: ...devices Ch 2 output devices Ch 3 output devices Ch 4 output and the power supply 7 2 2 MONITOR MENU This menu lets you monitor the status of the amplifier AC Voltage This shows the AC line voltage at...

Страница 24: ...nt displayed in this screen is incre mented and the operating time since the error is displayed Clear All Error Logs In this screen you can press and hold an the icon to clear all the error logs Line...

Страница 25: ...n on DHCP IP Address You set the IP address of the amplifier here See Section 12 for more information on IP Address This function is disabled when DHCP is enabled 1 Tap the Encoder knob icon to access...

Страница 26: ...Encoder knob to adj CobraNet Conductor Priority Turn tap then turn the Encoder knob to set the priority number of the CobraNet channel Press the knob to confirm your choice See Section 12 for more on...

Страница 27: ...VerTec Line Array You might use another preset that sets up the DSP for a stereo pair of loudspeakers of your choice You can choose any of 50 presets with the LCD Control Screen Preset 1 is the facto...

Страница 28: ...ormatting problem Try to create a new device file Loading the preset or device file from the USB device failed This could be due to the format or contents of the file Loading the preset or device file...

Страница 29: ...see the IP Address assigned to each card If you have a card with an IP address of 0 0 0 0 it typically means one of several things 1 The card is disabled 2 The card is not connected to a network 7 Ad...

Страница 30: ...button a control panel opens for that button s function Also on the right are buttons that open control panels for these functions Amplifier mode dual bridge mono input Y Signal generator pink noise a...

Страница 31: ...Indicator Output Signal Level Meter blue The mea surement range is from 0 dB to 40 dB with 0 5 dB resolution The monitors are scaled so that 0 dB is referenced to the full rated output voltage of the...

Страница 32: ...the digital signal has no audio but is sending a clock signal Digital with Analog Override The input takes the digital signal as its source If the analog signal level is greater than an Analog Signal...

Страница 33: ...g AES and CobraNet inputs The input signal of each channel can be independently muted The I Tech HD amplifier can be set to work as a fixed gain amplifier any input signal is given a fixed amount of g...

Страница 34: ...een can t be modified The latency on this screen is the CorbaNet transport latency or buffering This latency must be set to the same latency as the source CobraNet device The Foldback control panel le...

Страница 35: ...milliseconds to 10 seconds Compression Ratio Sets the compression ratio of the compressor The ratio is the relationship between the amount of attenuation applied by the compressor versus the amount th...

Страница 36: ...adjust channel equalization for up to 16 frequencies You can select filter type frequency gain and bandwidth in octaves or Q as set by the user preferences in System Architect Changes to the equalizer...

Страница 37: ...Channel 1 and Low Pass for Channel 2 are set to identical slopes and frequencies you can use FIR on all the bandpasses The logic for this operation is built into the software controls In addition the...

Страница 38: ...Threshold Sets the average power level in watts which the limiter will allow from the amplifier channel The range is from 10 watts to 10 000 watts This level should be set to the connected loudspeake...

Страница 39: ...ed will generate the error report This control has a range of 1 to 100 Line voltage The AC line voltage can be monitored and an error generated whenever the voltage is outside of the limits set by the...

Страница 40: ...imit below 3 dB unless you decrease the attenuator level Front Panel Display This button lets you blackout the front panel display until you press a front panel button or turn an Encoder This feature...

Страница 41: ...haracter name describing its function which is also stored in memory The Store Preset Control saves the current setting to the specified preset The Recall Preset Control recalls the specified preset s...

Страница 42: ...nel has the following controls Noise On Off Turns the noise generator on or off Noise Type Selects full spectrum white noise or pink noise Master Sets the noise level with a fader The sine wave signal...

Страница 43: ...us Gain Settings in the I Tech HD 7 7 19 Fixed Gain Mode in the I Tech HD Fixed gain mode makes any I Tech HD model have the same gain regardless of output power To do that fixed gain mode sets the An...

Страница 44: ...ifier is becoming too hot for safe operation Allow amplifier to cool Check for loads less than 2 ohms and for excessive input levels Check for proper ventilation CONDITION Fault indicator is flashing...

Страница 45: ...IBLE REASON Cable between computer and amplifier is bro ken or not connected Note Data indicator flashes only when the amplifier is polled for data or is polled to see whether it is online CONDITION Y...

Страница 46: ...e 20Hz to 20kHz at 1 watt 20Hz 20 kHz 0 25 dB Signal to Noise Ratio below rated full bandwidth power A weighted 108 dB Total Harmonic Distortion THD at full rated power at 1 kHz 0 35 Intermodulation D...

Страница 47: ...reo Bridge Mono 2 4 8 16 ohms 70V 100V 2 4 8 ohms 70V 100V Required AC Mains Universal AC input 100 240VAC 10 50 60 Hz Max AC mains voltage AC Line Connector USA UK European Australia India Brazil Chi...

Страница 48: ...Operation Manual I Tech HD DriveCore Series PowerAmplifiers page 48 Figure 9 1 Typical Frequency Response 1W Figure 9 2 Typical Crosstalk vs Frequency 9 Specifications Charts...

Страница 49: ...I Tech HD DriveCore Series Power Amplifiers Operation Manual page 49 Figure 9 3 Typical Damping Factor vs Frequency 9 Specifications...

Страница 50: ...8 0 128 6 128 3 106 1 115 2 111 8 131 1 144 0 142 0 113 6 124 5 0 441 1589 1370 715 764 701 441 1589 1370 715 764 701 379 1368 1179 615 657 603 I Tech 4x3500HD AC Current Draw and Thermal Dissipation...

Страница 51: ...mizes the amplifier s weight Typical non switching power supplies require large heavy transformers in order to produce the required power at the output stage These transformers must be large to operat...

Страница 52: ...switch which is something like an audio Y cable or distribu tion amp The computer and all the audio devices connect to the switch as in Figure 12 1 HiQnet protocol lets you control and monitor cer ta...

Страница 53: ...ddress is the network ID For example if the subnet mask is 255 255 0 0 and the IP address is 192 168 0 127 the network ID is 192 168 IP Router To communicate between different networks you need an IP...

Страница 54: ...is the same as for Ethernet 100 meters over CAT 5 copper cable 2 kilometers over multimode fiber Proprietary Fast Ethernet via single mode fiber networks can reach even further 12 2 2 Audio Specs Samp...

Страница 55: ...et network That is the Conductor is the master clock for the rest of the network You choose one device to be the network conductor based on a priority scheme The Conductor indicator will light on the...

Страница 56: ...elMAX has been designed to limit accurately to the specified voltage thresholds The addition of a thermal limiter allows thresholds for the faster acting RMS and peak limiters to be set higher providi...

Страница 57: ...threshold will be exceeded the signal is gradually reduced prior to reaching the threshold while still limiting to the correct peak voltage This approach eliminates a sharp signal discontinuity which...

Страница 58: ...n Main Panel Peak Enable Peak Threshold Peak Attack Peak Release RMS Enable RMS Threshold RMS Attack RMS Release RMS Detector Time Thermal Enable Thermal Threshold Thermal Attack Thermal Slope Kp Ki L...

Страница 59: ...RMS Threshold 1 200V 1V RMS Attack 0 10s n a RMS Release 0 10s 1ms RMS Detector Time 1ms 1s n a Thermal Threshold 1 200V 0 1V Thermal Attack 1 600V 1s Thermal Slope Kp Ki 1 10 n a Look Ahead 0 10ms n...

Страница 60: ...le attributes of FIR filters and closes with a set of example measurements on a two way loudspeaker system to illustrate the practical application of IIR and FIR crossover filters In addition audio de...

Страница 61: ...e time and frequency domains is also required This is where the FFT comes in Using the FFT to transform back and forth between the time and frequency domains so as to replace convolution with multipli...

Страница 62: ...t 96 kHz In system performance is equally dependent on the filter design process itself I Tech HD s platform optimized FFT Convolution algorithm and state of the art filter design methodology combine...

Страница 63: ...tation All measurements were accomplished using windowed freefield techniques in a non anechoic room at 1m using a 25 ms window This window size allows fairly accurate measurements to be made down to...

Страница 64: ...higher latencies allow sharper cutoff filters to be created with correspondingly lower corner frequencies FIR filters with latencies from 0 92 ms up to 29 33 ms can be created with the amplifier s sof...

Страница 65: ...system Note the extremely narrow crossover regions due to the rapid filter rolloff of the FIR filter Psycho acoustic tests reveal that these narrow high Q dips in the response are much less audible t...

Страница 66: ...n Authorization SRA is required for product being sent to the factory for service Please complete the SRA by going to www crownaudio com support factserv htm If you do not have access to our website c...

Страница 67: ...fec tive product at our authorized service center or our factory All expenses in remedying the defect including surface shipping costs in the United States will be borne by us You must bear the expens...

Страница 68: ...ce not including inter est insurance closing costs and other finance charges less a reasonable depreciation on the product from the date of original purchase War ranty work can only be performed at ou...

Страница 69: ...ntry __________________________ E mail address ___________________________________________ Phone include area code ___________________________ Fax __________________________________ MODEL SERIAL PURCH...

Страница 70: ...Operation Manual I Tech HD DriveCore Series PowerAmplifiers page 70 THIS PAGE INTENTIONALLY LEFT BLANK...

Страница 71: ...r equipment in your system _________________________________________________________________________________________________________________________________________________________ If warranty is expi...

Страница 72: ......

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