kkantor Posted December 2, 2009 Report Share Posted December 2, 2009 http://www.holmacoustics.com/holmimpulse.phpThis stuff is getting as good as some of the lower-end pro packages.-k Link to comment Share on other sites More sharing options...
Zilch Posted December 2, 2009 Report Share Posted December 2, 2009 Oh NO!MEASUREMENTS.AARRgghh.... Link to comment Share on other sites More sharing options...
Carlspeak Posted December 2, 2009 Report Share Posted December 2, 2009 I've downloaded it a few times (author is quite busy issuing updates in response to user's requests). Much can be learned over at diyaudio/speaker forum. There is a couple of threads devoted to this software.It's extremely flexible to the point that a noob will have trouble using it. The author is in the process of writing a manual. Link to comment Share on other sites More sharing options...
Pete B Posted December 13, 2009 Report Share Posted December 13, 2009 Just ordered one of these low cost calibrated units for field use:http://www.cross-spectrum.com/measurement/..._behringer.htmlInteresting mic options, particularly the $22 unit. Is it just a Panasonic in anice small case? Just noticed - is that "case" an inline phone jack?http://www.naiant.com/studiostore/microphones.html Link to comment Share on other sites More sharing options...
Zilch Posted December 13, 2009 Report Share Posted December 13, 2009 The Dayton equivalent of Behringer ECM8000 was on sale a couple of weeks ago for $35 -- it could happen again:http://www.parts-express.com/pe/showdetl.c...tnumber=390-801No, we can't just plug these measurement mics into our computers and be up and running; they are electret condensers which require preamps supplying phantom power.Not a big deal to make happen, but not so straightforward as some might suppose.... Link to comment Share on other sites More sharing options...
Pete B Posted December 15, 2009 Report Share Posted December 15, 2009 Anyone tried this USB mic pre? I can't seem to find a FR spec for it - the price is good if nothing else:http://pro-audio.musiciansfriend.com/produ...ower?sku=270707 Link to comment Share on other sites More sharing options...
speaker dave Posted December 15, 2009 Report Share Posted December 15, 2009 I just downloaded it and started playing with it. I LOVE being able to grab a time window and drag it sideways in real time.Oh, YES...measurements.David Link to comment Share on other sites More sharing options...
Zilch Posted December 16, 2009 Report Share Posted December 16, 2009 Anyone tried this USB mic pre? I can't seem to find a FR spec for it....16-bit implies 24 kHz max, no?Nyquist, yada, yada.[Pete knows this stuff.... ]Oh, YES...measurements.I'm printing out Curve Junkie Corps membership certificates here.... Link to comment Share on other sites More sharing options...
Pete B Posted December 16, 2009 Report Share Posted December 16, 2009 16-bit implies 24 kHz max, no?Nyquist, yada, yada.[Pete knows this stuff.... ]I think you mean 48KHz sampling is good for 24 kHz bandwidth whichis true for a non-realizable brick wall anti-aliasing filter. A guard bandis required in real life and it needs to be wider with inexpensive filters.Might be 4 kHz so let's say it might be good for 20 kHz but is it 1 ormore dB down? Also, for music it is not unreasonable to have a -3dBpoint of 20 Hz or higher, just a matter of bigger coupling caps to correctif it is not good. I really like my measurement system to be as flat aspossible so that I can run without a calibration curve - just in case I'm feeling lazy. I like the cal curve to just touch up the response to trim it up by a dB or less.Also, there's often AC line voltage coupling in Lap Top analog circuitryso it is good to get as much LF signal in to improve the SNR.We think we have the ECM-8000 schematic here, but I think there aresome mistakes as I comment in the thread:http://www.diyaudio.com/forums/multi-way/1...ment-mic-7.htmlSamples seem to be between 3 to 5 dB down at 20 Hz. Link to comment Share on other sites More sharing options...
Pete B Posted December 17, 2009 Report Share Posted December 17, 2009 I picked up one of these MXL Mic Mates and did a quick check of the frequency response, seems that it is -.25 dB at 20 and 20 kHz - completely flat in between as would be expected. Quite good enoughfor measurements. Seems to be a lot of LF noise, not sure if it is theMXL or something else. Link to comment Share on other sites More sharing options...
kkantor Posted December 23, 2009 Author Report Share Posted December 23, 2009 I picked up one of these MXL Mic Mates and did a quick check of the frequency response, seems that it is -.25 dB at 20 and 20 kHz - completely flat in between as would be expected. Quite good enoughfor measurements. Seems to be a lot of LF noise, not sure if it is theMXL or something else.I bought one to try to use for measurement work. But, I found the overload level to be too low for NF work, and the "pad" switch to have almost no effect on it. (Changed gain, but not O/L.) I'll stick with my Tascam for now. I think the MXL could work if one only did >1M work. (I can't seem to turn off the phantom power. Probably not a big deal, but silly.)Also, Shure has a similar unit that I haven't had a chance to try yet. -k Link to comment Share on other sites More sharing options...
Pete B Posted December 23, 2009 Report Share Posted December 23, 2009 I bought one to try to use for measurement work. But, I found the overload level to be too low for NF work, and the "pad" switch to have almost no effect on it. (Changed gain, but not O/L.) I'll stick with my Tascam for now. I think the MXL could work if one only did >1M work. (I can't seem to turn off the phantom power. Probably not a big deal, but silly.)Also, Shure has a similar unit that I haven't had a chance to try yet. -kThanks Ken, yes the switch seems to be about 3dB per step froma casual check. I just want to use it for RTA in room measurements,full measurements would have been nice but not required. It showsup as a generic USB device and at least the first time I tried it quickly,I got no control panel for it in SYNRTA - it did work, just could not change the gain. I'll have to see if I need a better driver or someother software.I might make an XLR cable that allows the MXL to power the Mic, thenalso tap off the signal and bring it into an M-Audio Transit which hasenough gain on the line in for most work with these high output electrets. Link to comment Share on other sites More sharing options...
Zilch Posted December 29, 2009 Report Share Posted December 29, 2009 HOLMImpulse measures my computer speakers in situ:Dayton EMM-6 measurement mic,M-Audio FastTrack Pro USB audio interface,Done.... Link to comment Share on other sites More sharing options...
Pete B Posted January 17, 2010 Report Share Posted January 17, 2010 I found the MIC-MATE to be too noisy with cheap build quality.The EMU-0202 gets an excellent review here, however it does not provide phantom XLR mic power:http://www.libinst.com/EMU%200202%20USB.htmI see that the EMU-0404 does provide phantom power andwould hope that it has at least as good performance:http://www.emu.com/products/product.asp?ca...p;product=15185These have an option for 192K sampling rate - excellent! Link to comment Share on other sites More sharing options...
speaker dave Posted March 21, 2010 Report Share Posted March 21, 2010 Here is another interesting piece of freeware:http://www.tolvan.com/edge/It simulates the 4pi to 2pi conversion of a speaker on a finite baffle. Calculates edge diffraction (reflections), if you will.Real easy to run, you define the front baffle rectangle and then place a driver of any size at any location on that baffle. You can even add multiple drivers and do some crude line array simulation that way.Fun to play with.David Link to comment Share on other sites More sharing options...
kkantor Posted March 23, 2010 Author Report Share Posted March 23, 2010 Here is another interesting piece of freeware:http://www.tolvan.com/edge/It simulates the 4pi to 2pi conversion of a speaker on a finite baffle. Calculates edge diffraction (reflections), if you will.Real easy to run, you define the front baffle rectangle and then place a driver of any size at any location on that baffle. You can even add multiple drivers and do some crude line array simulation that way.Fun to play with.DavidNice!If you get time, have a look at the following:http://www.classicspeakerpages.net/library..._public_dom.zipIt's an application we developed at Jensen to do similar things. I eventually released it into the public domain. It's showing its age, in terms of the interface and OS compatability, so I'm glad new tools are emerging.-k Link to comment Share on other sites More sharing options...
Zilch Posted March 23, 2010 Report Share Posted March 23, 2010 We are designing a crossover using HOLMImpulse and PCD here:http://techtalk.parts-express.com/showthre...716#post1633716[Yes, it took a few steps of file conversion to transport data between the programs.... ] Link to comment Share on other sites More sharing options...
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