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miniDSP SPK-4, User Manual

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miniDSP SPK-4 User Manual Download Page 2

 

 

 

miniDSP Ltd, Hong Kong / 

www.minidsp.com

 / Features and specifications subject to change without prior notice

 

2 

Revision history 

Revision 

Description 

Date 

1.0 

First released version  

4th June 2019 

1.1 

Updated for configurations/presets, added panel diagram 

17

th

 June 2019 

 

 

 

 

Summary of Contents for SPK-4

Page 1: ...miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 1 SPK 4P COMPACT DSP ENABLED IP SPEAKER SPK 4 AUXILIARY PASSIVE SPEAKER User Manual...

Page 2: ...p com Features and specifications subject to change without prior notice 2 Revision history Revision Description Date 1 0 First released version 4th June 2019 1 1 Updated for configurations presets ad...

Page 3: ...the SPK 4P 17 5 3 Key features 18 5 3 1 Master control 18 5 3 2 Configuration preset selection 18 5 3 3 Saving and loading configurations 18 5 3 4 Restoring to defaults 19 5 3 5 Local configuration s...

Page 4: ...m Features and specifications subject to change without prior notice 4 5 8 3 Filter file format 33 5 8 4 Loading filter coefficients 34 5 9 Keyboard shortcuts 34 6 Additional information 35 6 1 Specif...

Page 5: ...me to carefully read this user manual and the online technical documentation Thank you for your understanding Warranty Terms miniDSP Ltd warrants this product to be free from defects in materials and...

Page 6: ...authority to operate the equipment CE Mark Statement The SPK 4P has passed the test performed according to European Standard EN 55022 Class B A Note on this Manual This User Manual is designed for rea...

Page 7: ...ion and a powerful Digital Signal Processor DSP A single CAT5 6 network cable provides power low latency audio and control Each SPK 4P provides two channels of power amplification one for the internal...

Page 8: ...d on timing Unlike similar audio over IP AOIP technology AVB will dynamically assign and defend bandwidth allocation for AVB streaming thanks to the Stream Reservation Protocol SRP These are the key t...

Page 9: ...4P configuration Contact miniDSP directly if you require a USB capable firmware for the SPK 4P TOSLINK Digital optical input Sample rates from 20 to 216 kHz are accepted AMP The channel 2 output of th...

Page 10: ...not have inbuilt AVB support While it may be possible to use third party drivers please note that miniDSP does not support operation of the SPK 4P with earlier versions of OS X 3 1 ENABLING AVB SPEAKE...

Page 11: ...4 Drop down the Window menu and select Audio Devices Enabled AVB devices will appear as audio output devices in this window Each miniDSP SPK 4P identifies as AVB PoE Speaker Select an SPK 4P to confi...

Page 12: ...miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 12 2 Select the SPK 4P to include in the aggregate device...

Page 13: ...to change without prior notice 13 3 Optional Click on the Configure Speakers button and set the multichannel format to be used with the aggregate device Using the dropdowns select the speaker and chan...

Page 14: ...urchased your product from a miniDSP dealer you will receive a coupon together with the product Redeem this coupon and select the Plugin Group MiniDSP 2x4 HD1 at the link below https www minidsp com s...

Page 15: ...On the menu that pops up move the mouse over the Open With item and then click on Installer default 3 The following window will appear Click on Open 4 3 2X4 HD PLUGIN INSTALLATION 1 Navigate to the Pl...

Page 16: ...areas highlighted 5 1 SIGNAL FLOW AND PROCESSING OVERVIEW The signal flow diagram of the SPK 4P is shown in the diagram below One of the three stereo input sources is selected by the user and passed...

Page 17: ...amplifier inputs 5 2 SYNCHRONIZING WITH THE SPK 4P Click on the Search button All enabled compatible AVB devices appear in the Device Tree Click on the speaker that you wish to connect the plugin to T...

Page 18: ...tion This includes crossovers parametric EQ FIR filtering and the routing matrix It does not include the master volume or mute status Four configurations are stored onboard The currently selected pres...

Page 19: ...ration preset to the factory default settings 5 3 5 Local configuration storage When the Search box is used to connect to a SPK 4P the previously used settings for that speakers are loaded into the us...

Page 20: ...e The plugin must be in online mode to display signal levels Gain adjustment The gain of each channel can be adjusted by moving the Gain Adjustment slider or by typing the desired gain into the Curren...

Page 21: ...g matrix The input and output channel names displayed on the matrix match those set on the input and output control strips Changing the channel labels on the control strips changes them on the routing...

Page 22: ...annel strip This label also appears on the routing matrix To change the label click on it type a new label up to eight characters and press the Return key 5 6 3 Level meter and gain control Level mete...

Page 23: ...ing the combined response of all enabled parametric filters on that channel For example the screenshot above shows a response curve created with a low shelf boost filter at 100 Hz a dip at 500 Hz and...

Page 24: ...HELF and LOW_SHELF filter types this is the frequency at which the gain is half of the set value For the ALL_PASS filter type this is the center frequency of the phase shift Gain For the PEAK filter t...

Page 25: ...three way speaker the midrange driver will use both the high pass and low pass filters Crossover filters can also be used to limit low frequency content delivered to a speaker or subwoofer to help pr...

Page 26: ...types of filter Butterworth BW Available in 6 12 18 24 30 36 42 and 48 dB octave Butterworth crossover filters are 3 dB down at the cutoff frequency Linkwitz Riley LR Available in 12 24 36 and 48 dB...

Page 27: ...pass button to see the curve as shown here In this example the threshold is set to 20 dB so the compressor will activate when the signal on that channel reaches 20 dB relative to full output The ratio...

Page 28: ...described more in FIR filtering and design starting on page 32 5 6 8 Invert and mute Each channel can be inverted in polarity and individually muted When either of these options is selected the visua...

Page 29: ...biquad is the basic unit of processing that is used to create digital filters It can be described either with an equation or with a signal flow diagram as shown here A single biquad like this can per...

Page 30: ...is example illustrates the correct file format biquad1 b0 0 998191200483864 b1 1 9950521500467384 b2 0 996920046761057 a1 1 9950521500467384 a2 0 9951112472449212 biquad2 b0 0 999640139948623 b1 1 998...

Page 31: ...y filter types to be calculated including notch filters Linkwitz transforms and filters with arbitrary Q factor Access this spreadsheet here requires Microsoft Excel http www minidsp com images fbfile...

Page 32: ...s a file browser to select a file containing FIR filter coefficients See Filter file format below Unload FIR Deletes the currently loaded filter from the display and from the DSP memory Send to DSP Wr...

Page 33: ...have no more than 2048 taps The decision on how many taps to allocate to each channel up to you and should be determined after working with an FIR filter design program see below The number of taps i...

Page 34: ...ents click Clear Taps and then Send to DSP If after selecting a filter file or setting coefficients the frequency response graph does not change as expected make sure that the Bypass button is turned...

Page 35: ...ation 2x12W RMS under PoE mode power carried over CAT5 6 Audio sample rate Resolution Input output resolution 24 bit integer Sample rate 96 kHz Power supply 12 VDC single supply 2 1 mm round plug 45W...

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