M2TECH MITCHELL, User Manual

Page 1: ...M2TECH MITCHELL STEREO ANALOG ELECTRONIC CROSSOVER USER MANUAL REV PrB 12 2020...

Page 2: ...M2Tech www m2tech biz MITCHELL STEREO ANALOG ELECTRONIC CROSSOVER REVISION PRB DECEMBER 2020 Copyright 2020 M2Tech Srl 2...

Page 3: ...o other equipment in the system must be done when all equipment are off Failing to comply with this advice may lead to damage to the MITCHELL The label above printed on the product case indicates that...

Page 4: ...l provides a wealth of configuration options that make it possible to tailor it to the most demanding set up The all analog operation avoids the sound quality detriment and artefacts that affect digit...

Page 5: ...figuration 20 8 Configuring the MITCHELL 21 8 1 Set commands 22 8 1 1 Set Filter SF 22 8 1 2 Set Input SI 23 8 1 3 Set Level SL 24 8 1 4 Set Mode SM 25 8 1 5 Set Path SP 26 8 1 6 Set Remote SR 27 8 1...

Page 6: ...M2Tech www m2tech biz MITCHELL STEREO ANALOG ELECTRONIC CROSSOVER REVISION PRB DECEMBER 2020 Copyright 2020 M2Tech Srl 6...

Page 7: ...your retail dealer Remove the MITCHELL from the cardboard tray enclosure and place it onto a stable base far from heat sources Avoid full sunlight on the unit Allow for ample room around the unit for...

Page 8: ...M2Tech www m2tech biz MITCHELL STEREO ANALOG ELECTRONIC CROSSOVER REVISION PRB DECEMBER 2020 Copyright 2020 M2Tech Srl 8...

Page 9: ...em This feature must be enabled by the configuration app at set up 2 ON OFF button Allows to turn the MITCHELL on and off Also when the Mitchell is in standby pressing this button will activate it 3 S...

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Page 11: ...amplifiers Female RCA 8 Single ended inputs Connect to the single ended outputs of your preamplifier When the MITCHELL is set for mono operation only the left input is used Female RCA 9 Balanced inpu...

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Page 13: ...a preamplifier or other driving unit as the YOUNG MKIV to the MITCHELL single ended Fig 2 8 or balanced Fig 2 8 inputs Select the used input accordingly by the configuration app or directly by the rel...

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Page 15: ...cepts trigger signals 5VDC to 15VDC A trigger signal can be used to automatically activate the MITCHELL by a preamplifier so that all the system is powered on and off by the preamplifier s remote cont...

Page 16: ...M2Tech www m2tech biz MITCHELL STEREO ANALOG ELECTRONIC CROSSOVER REVISION PRB DECEMBER 2020 Copyright 2020 M2Tech Srl 16...

Page 17: ...digital before processing it and convert the processed signals back from digital to analog This is often unwanted as conversions apply a strong signature to the sound and usually systems sound like t...

Page 18: ...and pass or high pass independently Each filter module is composed by various blocks which can be composed in a lot of different fashions to make a large number of different filters one all pass filte...

Page 19: ...by configuration Its setting is totally independent from the 1 pole low pass filter 7 4 State Variables Filter SVF A state variable filter is a smart circuit that can be set to operate as 2 pole 12dB...

Page 20: ...ory which we will not address in detail as it s not in the scope of this manual and it s considered to be already known by the user To obtain the desired configuration the user must send the SP comman...

Page 21: ...ands Set commands are to apply a configuration choice filter block cut off frequency filter composition input selection Get commands are used to retrieve a setting from the MITCHELL configuration memo...

Page 22: ...erive f and q from the desired frequency and Q f Int 1024 1 44 21 frequency 0 5 b 1 2 H L f Int 1024 1 79 58 frequency 0 5 b A q Int 1024 1 10000 3 Q 1 0 5 Both parameters must be converted in hexadec...

Page 23: ...y connected to the selected input while ways B and C can be connected to the selected input or to the output of the previous way see examples The command has two parameters the first one w indicates t...

Page 24: ...d to feed all three ways from the single ended input Example 4 SI A P ERR The command returns ERR because the P value doesn t apply to way A 8 1 3 Set Level SL As explained earlier the MITCHELL has a...

Page 25: ...e 2 SL G B 10 04 OK Sets a gain of 2dB for all ways Example 3 SL A R 10 ERR The command returns ERR because the g parameter is missing Example 4 SL A R 10 40 ERR The command returns ERR because the g...

Page 26: ...red c is the channel to be configured in the chosen way p is the set configuration in hex format Please consult Appendix A for details on the various configurations available SP w c p where w A B C c...

Page 27: ...e same group code as M2Tech DAC s 96 means that the MITCHELL will accept commands with the same group code as M2Tech amplifiers A5 means that the MITCHELL will accept commands with the same group code...

Page 28: ...iguration of the MITCHELL in verbose mode so that it can be easily read by the user Syntax GC Example GC WAY A INPUT FROM SINGLE ENDED WAY B INPUT FROM INPUT WAY C INPUT FROM INPUT MODE STEREO REMOTE...

Page 29: ...EVEL 10 00 RIGHT WAY C ALL PASS 3E5 LOW PASS 1FF HIGH PASS 3F1 SVF1 1FE 1FF SVF2 1FF 1FF PATH 4580 LEVEL 10 00 END OF CONFIGURATION DUMP 8 2 2 Get Filter GF Returns the frequency and Q for a filter bl...

Page 30: ...second 2 pole state variable filter in both channels of way B Please note that this command can t tell which output of the stave variable filter is selected Please use the GP command to get this info...

Page 31: ...ause the G value doesn t apply to this command 8 2 4 Get Level GL Returns the level setting of the selected way and channel Two parameters are required w is the selected way c is the selected channel...

Page 32: ...nd channel as a 4 digit hex number The command has two parameter w is the selected way c is the selected channel Please consult Appendix A for details on the various configurations available GP w c wh...

Page 33: ...the active firmware GV Example 1 GV 1 06 8 3 Update commands Update commands are used to handle the firmware update While certain commands can be issued manually the actual data transfer is a lengthy...

Page 34: ...ax UD 16 x hh cc Where hh cc are 2 digit hex number Example 1 UD14E6FF3430303030302F0AFFFFFFFFFFA3 OK Example 2 UD8B00013F51FFFF04AAF330303030CC6F9E WRITE Note checksums in both examples are not right...

Page 35: ...uencies and dumping factors must be calculated and converted in the numbers accepted by the MITCHELL via the SF command M2TECH has developed a free configuration software running under Windows called...

Page 36: ...M2Tech www m2tech biz MITCHELL STEREO ANALOG ELECTRONIC CROSSOVER REVISION PRB DECEMBER 2020 Copyright 2020 M2Tech Srl 36 Figure 4 Mitchell Configurator basic layout...

Page 37: ...STEREO ANALOG ELECTRONIC CROSSOVER REVISION PRB DECEMBER 2020 Copyright 2020 M2Tech Srl 37 Figure 5 Mitchell Configurator Filter Plots The use of the configuration software albeit quite straightforwar...

Page 38: ...ech Srl 38 9 Specifications Input and output headroom 9Vrms single ended 18Vrms balanced SNR 110 to 120dB 1Vrms in 1Vrms out A weighted depending on configurations THD N 0 015 1Wrms on 4 Ohms Supply v...

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Page 40: ...pass 30dB Oct non inverting 6440 Low pass 30dB Oct inverting A440 High pass 6dB Oct non inverting 4580 High pass 6dB Oct inverting 8580 High pass 12dB Oct non inverting 44C0 High pass 12dB Oct invert...

Page 41: ...notch non inverting 6423 Low pass 6dB Oct double notch inverting A423 Low pass 12dB Oct notch non inverting 4420 Low pass 12dB Oct notch inverting 8420 Low pass 18dB Oct notch non inverting 6420 Low...

Page 42: ...pass 12dB Oct shelving notch non inverting 7521 High pass 12dB Oct shelving notch inverting B521 High pass 24dB Oct shelving non inverting 7501 High pass 24dB Oct shelving inverting B501 Band pass 12...

Page 43: ...00 Band pass 18 6dB Oct non inverting 56C0 Band pass 18 6dB Oct inverting 96C0 Band pass 18 12dB Oct non inverting 5700 Band pass 18 12dB Oct inverting 9700 Band pass 18 18dB Oct non inverting 5600 Ba...

Page 44: ...Oct notch inverting A621 Band pass 18 6dB Oct notch non inverting 5721 Band pass 18 6dB Oct notch inverting 9721 Shelving non inverting 0700 Shelving inverting C700 Shelving notch non inverting 77E0 S...