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Certes KLEAR AUDIO KLR1m User Manual

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

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Summary of Contents for Certes 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 3 T able of Contents: WELCOME AND IMMPORTANT INFORMATION PRODUCT OWERWIEW SPECIFICATIONS AND FRONT/REAR PANELS FIRST START UP OF APL MEASUREMENT SOFTWARE MEASUREMENT TECHNOLOGY First measurement, Sequence and Actions CONNECTION AND USAGE OF KLR C1 USAGE OF KLR1 LS EQUALIZER KLR TECHNOLOGY MESUREMENT TECHNIQUE •...
  • Page 4 Thank you for choosing KLR1M! To get the most out of your KLR1m FIR filter DSP, please take the time to read through this manual. System Requirements: To configure your KLR1m you will require a Windows computer with the fallowing specification: PC with at least 1GHz processor.
  • Page 5 KLR1m is a member of KLEAR KLR1 family of FIR based system equalizers. Very compact in size and cost-effective KLR1 is fully capable DSP with FIR (finite impulse response) filter EQ (700 taps). Class compliant USB graphic interface makes possible to configure every detail of your audio system and offers pre-configured design templates that can be used as starting points for a variety of DSP applications.

  • Page 6: Specifications

    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.
  • Page 7 Analog Input and Output Schematic:...
  • Page 8 The KLR1m workflow: 1. Download and install all the necessary software: APL Workshop • APL FIR Converter • Sigma Studio by Analog Devices • It will be available from the user downloads section of the KLEAR website. Download and install the Software fallowing the instructions in the user manual. Familiarize yourself with each software and its user interface before connecting to processor.
  • Page 9 Please make sure that you enter the right amount of FIR filters used by a FIR converter in the Left and Right Channel windows. 4. Save the configuration to the file. 5. Make the necessary audio connections. Make sue that your system power is turned off before connecting the device.
  • Page 10 Sigma Studio Overview: SigmaStudio™ is a graphical development tool designed by Analog Devices to program SigmaDSP® audio processors. The software includes an extensive library of algorithms to perform audio processing such as filtering, mixing, and dynamic processing, as well as basic low- level DSP functions and controls.
  • Page 11 • After logging in, go to the software download page: http://www.analog.com/en/dsp- software/ss_sigst_02/sw.html • Click “Download the latest SigmaStudio release”, or “Download the latest SigmaStudio beta release”, depending on if you so Set the labels of input and output channels • Mute unused input and output channels • Set crossover frequencies and slopes •...
  • Page 12 3. „Play”- test signal playback. Input level meter will show signal level received from measurement microphone. Signal level is not very important and does not influence the measurement. Main rule – avoid the input level and the whole input signal route overload (clip). 4.
  • Page 14 • Install APL1 drivers by running “driver_install.exe” you can find in APL Configuration Software installation folder. • Connect APL1 device to your computer with USB cable. Start APL Configuration Software. Press F1 to connect to APL1 device. If “driver_install.exe” failed to run (it may happen for some systems), connect APL1 device to your computer with USB cable.
  • Page 15 Connection and usage of parametric EQ C1: 1. Extract C1 installation archive to HDD. 2. Copy file „apeq_id.txt” to the exchange folder. This sets the exchange folder place for C1. Run C1. Choose two *.fir files (you can just drag it in with „drag and drop”...
  • Page 16 The frequency characteristic measurement of emitted sound power is based on summarized information about sound pressure in many points on main emitting segment (of virtual spherical surface around a loudspeaker) of the loudspeaker. During the measurement, move the measurement microphone evenly, like drawing imaginable cells, but do it in only in one dimension –...
  • Page 17 The basic goal of APL is to measure and correct exactly the loudspeakers PF response to obtain uncolored and pure sound out of it. The idea of a hall (room) correction by introducing pre distortions in loudspeaker sound is risky and should be well considered.
  • Page 18 It means, you must try to keep the overall balance LF-HF same as it was before correction, to clearly evaluate correction effect in details (narrow band colorations 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”.
  • Page 19 You can reestablish any balance you like by C1 parametric EQ or by a target curve application in APL Workshop software, in the field “Targets, Corrections”. (Examples: mp1.txt, 1dBperOCT.txt, 7dB_krit_INTPc.txt). Directivity of loudspeaker There is a problem of APL correction application on loudspeakers with particularly strong directivity.
  • Page 20 “smoothing” to 1 okt., press “Calculate”. Now you have edited directivity curve. 2) go to first (initial) PFR measurement (select it) in measurement tree, set check box in lowest place in “Compensations, corrections, targets”, brows for *_PRS.dat file of previous recalculation, press “v” button to see is your selection right, check the check box “Inv”, press “Calculate”.
  • Page 21 I have discovered that Behringer ECM-8000 microphone differs from my Earthworks just for 0,5 dB in region of 20 kHz and that is why I can easily use them both without any correction. In most cases microphone curve errors are negligible in comparison to loudspeakers ones.
  • Page 22 subwoofers which have huge GDT (group delay time). In concert hall situation it is usually enough to have 50ms time window. In open air situation you can freely use wider time window if the noise and wind (look at blue curve) does not interfere and in this case it is necessary to use windshield for microphone.
  • Page 23 Any sharp and deep dip means some problems in your loudspeaker (something out of phase) or problems in particular measurement. Evaluate how close is the light blue curve to the PFR green curve of your measurement. The blue curve represents noise and interference from one measurement sweep to next one because of reverberation.
  • Page 24 After each new measurement you will see your measurement record in measurement tree on left side of APL Workshop software window. Each of measurement can contain number of “recalculations” obtained by some change in parameters and calculated with such new settings by pressing “Calculate” button. Double click on any “recalculation”...
  • Page 25 comment field some very short comment about what you did in this particular recalculation. The Measurement tree is showing comments to make browsing more easy. Everything you do in APL Workshop software is instantly stored in respective folders and do not need for “save as”. If you like to delete something, you must do it yourself. You can delete measurement by use of button “Delete”...

  • Page 26: Calculation Parameters

    Calculation Parameters: “Skip impulse frames from start/end” – discards first and last n measurement swipes allowing, for example, going from PC to a measurement place. “Time window file” – to browse for time window file. Time window files are stored in TW folder.
  • Page 27 “Comment” – place to write comment for new recalculation. It will than displayed in measurement tree next to recalculation number. It will help to know what you have done in each of particular recalculations. “Period of test signal” – sets length or period of the test signal used for measurement. Available are 0.341, 0.683, 1.365- and 2.731-seconds test signals.