Certes KLEAR AUDIO KLR1m User Manual Download Page 6

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Specifications

Number of processing channels:

1 or 2, user configurable.

Resolution:

48kHz/24bits.

Frequency resolution of correction curve:

35 Hz, 700 coefficients for FIR filter @ 24 kHz

bandwidth.

Inputs

: 4 x analog, balanced.

Outputs

: 2 x analog, balanced, 1 x analog stereo output.

Input/output analog signal max levels:

+10dBu.

Analog input/output connection types:

3,5mm mini jack.

Analog input impedance:

20 kOhm.

Analog output impedance:

150 Ohm.

Common mode signal rejection (CMSR) of analog input

: 60 dB.

Dynamic range (analog input/output):

98 dBA.

THD (analog input/output):

-80dB.

Signal delay:

1.6ms

Control and upload interface:

C (Inter-Integrated Circuit), with Micro USB connector

Interface management:

Sigma Studio Software by Analog

Devices

Power:

5V 0.12A (0,6W)

Diamensions:

113mm x 20mm x 70mm (L/H/W).

Weight:

140g

Application of use example:

Summary of Contents for KLEAR AUDIO KLR1m

Page 1: ...K L E A R A U D I O C E R T E S L V KLR1m USER MANUAL ...

Page 2: ......

Page 3: ...EASUREMENT SOFTWARE MEASUREMENT TECHNOLOGY First measurement Sequence and Actions CONNECTION AND USAGE OF KLR C1 USAGE OF KLR1 LS EQUALIZER KLR TECHNOLOGY MESUREMENT TECHNIQUE OVERALL LF HF BALANCE LOUDSPEAKER DIRECTIVITY MEASUREMENT CALIBRATION AND TESTING F A Q WORKFLOW OF APL WORKSHOP SOFTWARE APL WORKSHOP FUNCTIONS DESCRIPTION ...

Page 4: ...o cause damage to your audio system Safety Instructions Location Before moving the device remove all connected cables Do not expose the device to excessive dust or vibrations or extreme cold or heat such as in direct sunlight near a heater or in a to prevent the possibility of panel disfiguration or damage to the internal components Water warning Do not expose the device to rain Do not use it near...

Page 5: ... as starting points for a variety of DSP applications Quick and easy to install it is ideal for small and medium event rooms school classrooms retail spaces and many more or this pocket size unit can be a great addition to every audio engineer s tool kit Main Features 4 x nalog Inputs 2 x Balanced and 1 x Stereo outputs FIR filterring on all putputs 700 taps in total Fully programmable DSP with wi...

Page 6: ... 10dBu Analog input output connection types 3 5mm mini jack Analog input impedance 20 kOhm Analog output impedance 150 Ohm Common mode signal rejection CMSR of analog input 60 dB Dynamic range analog input output 98 dBA THD analog input output 80dB Signal delay 1 6ms Control and upload interface I2 C Inter Integrated Circuit with Micro USB connector Interface management Sigma Studio Software by An...

Page 7: ...Analog Input and Output Schematic ...

Page 8: ...al 2 Familiarize yourself with each software and its user interface before connecting to the processor 3 Use the Sigma Studio to set up an initial audio processing configuration as intended for your application For example 1 Input Output processing 2 Equalization 3 Delays Limiters etc Load the FIR filter Equalizer correction into the Sigma Studio by loading table values from where the files from y...

Page 9: ...tors from your computer to KLR1m Make sure that in hardware config page sigma studio the USB is marked green not red 7 Do The fine tuning and real time adjustments Now you can fine tune your system in real time by adjusting your parameters and then sending the data to the processor via Function F7 button in the Sigma Studios 8 Write it to the processor memory When you are happy with the results yo...

Page 10: ...l needs and the amount of resources available The compiler takes care of generating DSP ready code and a control surface for setting and tuning parameters in real time listening to the result of the changes you make This tool allows engineers with no DSP code writing experience to easily implement a DSP into their design while remaining powerful enough to satisfy the demands of more experienced DS...

Page 11: ...se your work if you inadvertently restore the processor to default settings For more information on configurations see Working with configurations on page 43 6 Make audio connections With the initial configuration done and now that you are familiar with the various controls it s time to connect the miniDSP 2x4 HD into your system Ensure that all power is turned off when making audio connections Se...

Page 12: ...pop out In folder Your project Your measurement 01 you can find all of result curves in a text file format DAT and equalizer file fir which should be loaded into APL equalizer device or plugin 6 If you want you can calculate results once more with different APL Workshop parameters Just change the parameters and press Calculate button After few seconds software will create new curves which will be ...

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Page 14: ...ization for your loudspeaker system Second possibility to load the correction filters is by using Fast Reload function in APL Configuration Software that takes filter files from the file exchange folder on HDD and loads those files into APL1 device The file exchange folder will be used by 3 different software s APL Workshop and C1 to write equalizer files and APL Configuration Software to load tho...

Page 15: ...rom the exchange folder C1 stored edited files here will be loaded into APL1 device Check this by observing log records in APL Configuration software window It is possible to activate Fast Reload function even if APL Configuration software window is not in front is minimized by use of keys CTRL F5 5 You can do new edits on C1 software press Apply button Then press F5 CTRL F5 for APL Configuration ...

Page 16: ...12 15 columns and perceive 12 15 sweep signals on each of them Those measurement principles are the same for loudspeaker systems of any size or placement There is one important measurement rule it is necessary to reach the reflecting surface s floor wall Last measurement column should be next to the wall Measurement should be done in a suitable distance which is not less than speaker size and not ...

Page 17: ...Workshop is working with impulse responses obtained for each of measurement points does not get into measurement Time Window which is 50ms by default To avoid loss of information about LF it is necessary to increase time window to 100ms by choosing 100_20Hz wav file in selection Time window file and evaluate changes of curve in 30 100 Hz range If the changes are significant then use increased Time...

Page 18: ...ons are removed but not being disturbed by the change in overall LF HF balance 15years of experience shows that systems that perform well usually have overall LF HF balance very close to the one proposed in target curve stored in file mp1 txt If your measured curve looks like this mp1 you must use mp1 target curve to keep your overall balance of LF HF as is ...

Page 19: ...g is strange hard to define reflecting surfaces place it in a middle of room on the floor and measure it at minimal distance commensurate to its size For concert hall measure in minimal admissible distance but of course leaving loudspeaker at his working placement 2 In this Subordinate measurement we should separate allocate directivity effects from the overall PFR curve For that you should subtra...

Page 20: ...rrection curve for one of them if you know curve of another one Measure loudspeaker with one microphone then with another one and then compare curves in any manner you prefer It is important that measurement painted area is as equal as much as possible for both measurements For this reason you can practice with the same microphone by measuring the loudspeaker for few times to train your hand to ge...

Page 21: ...o the loudspeaker systems size If height of the loudspeaker is 2m then the distance radius of measurement segment should not be closer than 2m If the system is hung in height of 4m it means that the distance should not be closer than 4 m What should be a size of the plane painted by measurement microphone The measurement plane segment must reach reflective surfaces and must cover as much as possib...

Page 22: ...ns What kind of ignore to apply It is necessary only in situation when we try to correct some disturbed measurement curve manually For example ultra low noises disturbed the measurement and are bringing measured PFR curve back to 0 dB on 20 30 Hz The use of ignore function will set the curve to value of the low frequency limiter for all range of frequencies up to the frequency set by ignore parame...

Page 23: ...from one measurement sweep to next one because of reverberation It must be at least 10 15 dB below PFR curve Ordinary it is not visible Evaluate IR curve of your measurement It must look like this You must not see spikes in region from 250ms to the end of graph like those If you see such spikes it means you have large nonlinear distortions in your loudspeaker You must be especially careful if such...

Page 24: ...alizer files of your measurement in APL1 equalizer But usually you may need to make some adjustments to get best of possible results You may need to use target curve to keep or adjust overall LF HF balance For example mp1 txt To do this check one of check boxes in Compensations corrections targets browse for mp1 txt file press v button to see its curve write mp1 in Comment field and press Calculat...

Page 25: ...ect creates and opens new measurement PROJECT Open Project opens previous project You must browse for its folder NEW opens measurement window to run new measurement DELETE deletes measurement selected in measurement tree NEW BATCH opens measurement window to run new sequence batch of measurements When one measurement is stopped software is ready for new one instantly This function is very useful e...

Page 26: ...hing performance to remove any residual narrow band curve disturbances caused by a finite number of measurement points Filter settings sets synthesized equalizer FIR filter parameters The filter size for APL1 device must be 4096 Filter sampling frequency sets sampling frequency for synthesized equalizer FIR filter The filter sampling frequency for APL1 device must be 48000 Compensations correction...

Page 27: ...cess previously recorded measurement microphone signal wave file You will find wave file containing microphone signal recorded in your measurement folder after each measurement By use this function it is possible to process again this file by you or by your friend or by APL support Rec sample rate the sample rate used for playback of test signal and recording of input signal It depends on your sou...

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