Not “involving”. The thresholds to determine the maximum SPL are: When the speaker has reached either or both of the above thresholds, the test is terminated and the SPL of the last test is the maximum SPL. The ISC module permits results with as-close-to-anechoic as one can achieve without being anechoic. The Pioneer BS22 and Micca MB42X both use dome tweeters. Too objective for subjectivists; too subjective for objectivsts. I even went so far as to use my Dayton DATs to sweep both speakers to make sure the impedance curves matched because I thought maybe one of them was damaged but that wasn’t the case. In the below results I provide the summarized table as well as the data showing how/why this SPL was deemed to be the maximum. I would strongly suggest using an EQ to help with the response. SX6comes in two colors black and natural walnut. The Micca MB42 is one of the most purchased bookshelf speakers up to date. However, SPL provided is relative to 1 meter distance. Generally speaking, higher sensitivity speakers (like pro-audio speakers with 100dBSPL @ 2.83v/1m spec) suffer relatively no compression while lower sensitivity speakers (low 80’s dBSPL @ 2.83v/1m) suffer more compression. When a crossover is used the compression near the speaker’s Fs is attenuated and overall the compression effects are mitigated. One of the things I absolutely need to mention in my review is the build quality of Micca speakers. The impedance of a speaker varies depending on the frequency being played, and it is normal for most 8ohm rated speakers have impedance that dip as low as 4ohms or even lower. The minimum impedance dips to about 4.2 Ohms around 1.4kHz with a nominal impedance at about 5 Ohms. I listened to these speakers and made my subjective notes before I started measuring objectively. … and that’s it. There’s truly nothing positive I can say about this speaker. In a poll I found most listen to music in this range. They were that bad. Ground plane measurements are perfect for this but are subject to aiming/ground absorption (grass) and related issues above 400Hz. Too objective for subjectivists; too subjective for objectivsts. Micca has been a friend to budget audiophiles for a while now, releasing a series of affordable, compact and sometimes oddball speakers that do enough things right to catch audiophiles’ attention. Enclosure: Rear ported, matte black vinyl. The tuning frequency of the enclosure is approximately 50Hz. At this point I decided to move closer to see if listening in the nearfield would help (spoiler: it didn’t). The Neumi is the same price as these Micca speakers and the Neumi performance is leagues better than the Micca. However, note: the 80Hz signal is a “brick wall” and does not emulate a typical 80Hz HPF slope of 24dB/octave. The mean SPL, approximately 85.5dB at 2.83v/1m, is calculated over the frequency range of 300Hz to 3,000Hz. This results in a very “hollow” sound in the midrange and rather “forward” sounding presence region followed by a lack of upper end detail and sense of space (also thanks to the increasing directivity of the tweeter). The volume controls and the power button are placed in the back, which might be inconvenient. This measurement follows the IEC 60268-21 Long Term SPL protocol, per Klippel’s template, as such: Each voltage test is 1 minute long (hence, the “Long Term” nomenclature). You can also join my Facebook and YouTube pages if you’d like to follow along with updates. Well, looking at the data we see a big trough smack in the midrange at about 300Hz. The evolution of the original irreverent and irrelevant and non-authoritative site for headphone measurements, i.e. Thanks to the ISC module, the data I am providing here is higher resolution (~30Hz resolution) than an average person can provide without access to an anechoic chamber or the like. Not simply because of subjective performance. The response curve of the Micca MB42X MKIII is extremely non-linear; exhibiting as a wholly recessed midrange, a prominent bump between 1-2kHz and poor linearity above 4kHz. 99 Micca RB42-C Center Channel Bookshelf Speaker with 4-Inch Woofers and Silk Tweeter (Dark Walnut, Each) 4.8 out of 5 stars 82 Micca’s MB42X are an upgrade upon the older MB42s with an actual crossover (hence the appending “X”) that properly dedicates the correct frequencies to the tweeter and woofer respectively. In short, the CEA-2034 graphic below takes all the response measurements (horizontal and vertical) and applies weighting and averaging to sub-sets and can help provide an (accurate) prediction of the response in a typical room. The MB42X cabinets are somehow bulky for bookshelf speakers, with 6 in width, 7 inches in depth, and 10 inches in … With that in mind, what you see below is first the Total Harmonic Distortion at varying output levels. This, obviously, won’t allow you to adjust the quality of the sound and maybe make it more “full.” Which leads us to the next drawback. The speaker’s F3 point (the frequency at which the response has fallen 3dB relative to the mean SPL) is 116Hz and the F10 (the frequency at which the response has fallen by 10dB relative to the mean SPL) is 65Hz. If you want help understanding what this data means, watch the video below. All of these parameters translate to a speaker that needs to large enclosure (so the Qtc will not be any larger; as the Qts itself is already relatively high), high low cutoff point (due to high Fs) and low sensitivity (even though the on-axis average SPL is ~ 85.5dB, the SPL in the bass region is in the low 80’s). Each of the units features a four-Inch woven carbon fiber woofer with rubber surround along with a silk dome tweeter. Crossover: Advanced 9-element. This model can really compete with options that are more expensive and will be up to par with almost any $100-150 speaker. Using Klippel’s Distortion Analyzer 2, Large Signal Identification Module, Pro Driver Stand and provided Panasonic ANR12821 Laser along with Klippel’s Training 3 - Loudspeaker Nonlinearities tutorial, I measured the linear, nonlinear and thermal parameters of this drive unit. You may ask just how useful the above prediction is. The vocals are more in the foreground, but the sound isn’t flat or static. However, some is given using Klippel’s graphing. Buy the Neumi BS5 if you’re looking for a budget set of bookshelf speakers. As I said above, the provided frequency response graphs were given with a limited set of data. And, finally, here is a great video of Dr. Toole discussing the use of measurements to quantify in-room performance. Comparatively, this Micca speaker isn’t even in the same ballpark. Either way, it’s a useful visual to get an idea of the directivity characteristics of a speaker or driver. I'm wondering if anyone has any experience with the Dayton MK442 as a center (I know people like to purchase as pairs and use them as L/R's). Sausalito Audio also has a good write-up on these curves here. In my experience, all these factors play in to how the listener “connects” with the system. Both are currently free software. The Micca MB42x MKIII is a terrible speaker if you intend to listen to it as a budget audiophile speaker (or anything resembling that). Steve Winwood’s “Higher Love”: Wide left soundstage; missing something below 1kHz tonally; hollow sounding. I also love the matte finish and the magnetic grill. The green line shows the final measurement where either distortion and/or compression failed. frequency response graphs, CSD waterfall plots, subjective gear reviews. frequency response graphs, CSD waterfall plots, subjective gear reviews. 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