Testing loudspeakers by joseph dappolito brings essentially all the pertinent information together in one place for a nominal price. Appolito, who is worldrenowned for his pioneering work on mtmbased midtweetermid loudspeaker configurations. Measuring loudspeaker lowfrequency response by joe dappolito. Depending on the exact implementation the speakers can be positioned with a vertical andor horizontal orientation. Infinty crescendo 3008s inverted on top of infinity crescendo 3009s. The dappolito configuration offers a number of advantages over standard singlewoofer designs, including. In conjunction with the mtmdappolito configuration, this helps create a transparent, cohesive sound. Joe dappolito presents at audio video design about the revolution of the speaker and the quality of sound you should expect from your own speakers.
In his aes paper, he explains mathematically how an mtmconfiguration can prevent lobing errors in the crossover region, even if there is a phase shift between the two sides of the crossover. Joe dappolito was certainly the first to describe in engineering terms what the advantages of an mtmsetup are. The dappolito speaker design is the mtm speaker design. The result is a more consistent listening experience, smoother frequency response, and an ultrawide, detailed stereo soundstage. The silverado, a small dappolito loudspeaker introduction. Tweetermidwoofer mtm, also known as dappolito configuration offers improved offaxis response and spatial resolution. Finally, folding the line provides additional highfrequency attenuation, somewhat like that obtained with the. This is a similar design with the eminence 10 woofs btw i have a pair of diy 2way which use the eminence 10a. Mtm driver configuration one driver is automatically offset from. Simply ignore the silly nomenclature and grandstanding portions of the book. The upside of all this is well also get a boost in efficiency as two identical drivers will be used for the lowmidrange and theyll be able to handle a higher load. Dec 23, 2019 think d appolito line source midbass line source with a line source ribbon in the middle. In the last several years, the vertically symmetric twoway loudspeaker arrangement analyzed in that paper a.
Tweetermidwoofer mtm, also known as d appolito configuration offers improved offaxis response and spatial resolution. Eventually jesper ekta and ekta grande constructions came by, bringing in a finished ellam dappolito, thus the old file will be updated with new pics and measurements and a slightly finetuned crossover, now for the. View joseph dappolitos profile on linkedin, the worlds largest professional community. Feb 24, 2010 joe d appolito presents at audio video design about the revolution of the speaker and the quality of sound you should expect from your own speakers. The motors openbacked structure is said to eliminate backwave reflections, and the silk dome is free from the single breakup mode that is characteristic of metaldome tweeters. Measuring loudspeaker lowfrequency response by joe. A presentation by joseph dappolito at audio video design. He also pioneered the extremely popular dappolito woofertweeterwoofer driver configuration, seen in many successful loudspeakers systems.
He also pioneered the extremely popular d appolito woofertweeterwoofer driver configuration, seen in many successful. I was just wondering what are the advantagesdisadvantages of this type of driver arrangement on a speaker. Presonus eris e44 high definition mtm dual 4 powered. Emess most powerful 2way system, the blue hr active is designed as a dappolito configuration. For them to be free of any type of problems, the two drivers that are doing the same job, have to be 100% ts matched and work in absolute unison to be effective in producing those midrange frequencies as good as one driver can do. With the blue hr you get a mix that is compatible in a wide range of reproduction situations. Youll get vertical lobing if you do this, however, so itll be a sit and listen system and not necessarily as good a up and around system. Its five active speakers with 270 watt output fill the room with near perfect sound they complement each other superbly in the dappolito arrangement, delivering an incredibly natural and authentic sound its resonance free housing is covered with a seamless. You might want to pm scrappydue and ask his opinion on this as i believe he owns one.
Its nested midwoofertweetermidwoofer mtm, also known as dappolito configuration offers improved offaxis response and spatial resolution. Kef tangerine waveguide and the shape of the midrange. Mtm driver configuration one driver is automatically offset from the closed end of the line. I could jump to the final result, but i think the various steps in the process. In all cases, the lowfrequency drivers are 25 mm behind the highfrequency driver, the diameters of the lowfrequency pistons are 100 mm, f c 2. See the complete profile on linkedin and discover josephs. Typical lobing behavior at the crossover frequency for 2,2 configurations. Dappolito spacing techtalk speaker building, audio. It seems both drivers can very comfortably make it to 80hz as a dipole. The pl14wj0908 is to my ears one of the most smooth sounding 5 drivers ever made and no wonder it has been a steady driver in the tymphany program for years and years.
The 100iwlcr5 loudspeaker which is dedicated to home audio can be highlighted for its acoustics performance and compact design. A loudspeaker configuration developed by and named for joe dappolito, in which a high frequency driver, or tweeter, is positioned between two midrange or low frequency drivers that each cover the same frequency range. Joe dappolito introduction with the availability of lowcost pcbased acoustic data acquisition systems experienced loudspeaker designers can make accurate loudspeaker frequency response measurements without an anechoic chamber. Here is your d appolito mtm center, with the eminence 8 woofers. Presonus eris e44 high definition mtm dual 4 powered studio.
The proteus to d appolito or not to d appolito, that is the question. The dappolito design at audio video design youtube. Dappolito polar response comparison, left a conventional arrangement. Joseph dappolito president dappolito laboratories, inc. The b100 is not laid out for rendition true to nature also with highest levels and even with galelike levels over 115 db brings those nearly. By design the m57 is fitted with 30mm thick walls and baffle wherein the driver units are flush mounted.
He also pioneered the extremely popular d appolito woofertweeterwoofer driver configuration, seen in many successful loudspeakers systems. Thanks all for the great discussion on the d appolito configuration. Sep 25, 2008 designer joseph d appolito, whose name is practically synonymous with the paredvertical array, will now work exclusively as snells fulltime engineer. The present design uses an mtm driver configuration in a tapered, folded line. Think d appolito line source midbass line source with a line source ribbon in the middle. For this online publication, audioxpress kept the original article unchanged, which has. Joseph d appolito, contributing editor for speaker builder magazine. Here is your dappolito mtm center, with the eminence 8 woofers. Dappilitos idea has been modified due allow for the many dif. In his aes paper, he explains mathematically how an mtm configuration can prevent lobing errors in the crossover region, even if there is a phase shift between the two sides of the crossover. Popular systems include clio, mlssa, praxis, and sound easy to name a few. Dec 27, 2015 my favorite d appolitoline array set up. To achieve unsurpassed sound quality you can use the sa m57 in combination with the sa he50 amplifier fanless design from the sa highend series.
Focal 100iwlcr5 inwall 2way dappolito loudspeaker audiolab. The proteus to d appolito or not to d appolito, that is. The d appolito configuration offers a number of advantages over standard singlewoofer designs, including. The d appolito configuration, mtm midwoofertweetermidwoofer offers the theoretical advantages of vertical symmetry, more midwoofer cone area plus a second voice coil for improved dynamic capability in that frequency range without resorting to bigger cones, and better floorandceiling interaction. These products are aimed at small to medium sized rooms and for three types of use. The d appolito speaker design is the mtm speaker design. This driver offset will mitigate somewhat against the lowfrequency extension provided by the taper, but will help to reduce midbass response ripple. The dappolito array is symmetrical with respect to movement up or down, and the result for it is a flipped version of the graph already shown. The dappolito configuration has a much wider offaxis reproduction hence it is better suited for loudspeakers thatll be used in either a vertical or horizontal orientation. The original thor transmissionline design was published in may 2002. The bragi consists of two 18cm long throw woofers with a curv cone made of woven polypropylene and a 27mm aluminummagnesium dome tweeter with a dxt lens.
The dappolito design, more commonly referred to as mtm configuration in the diy world midtweetermid has withstood the test of time and has been the model for some of the worlds finest sounding speakers. There is a question to be asked with dappolito speakers, that have the critical midrange handled by two drivers. This product is aimed at small to medium sized rooms and for three types of use. Tapering the line greatly increases the frequency range of bass augmentation produced by the line. It also boasts twoway mtm dappolito configuration in a sealed cabinet for accurate performance close to a wall or in restrictive spaces.
The final system design ive made is a soort of d appolito using the dynaudio esotec d 260 filtered passively first order at 2 khz, then the midbass range is done. I have some older heresys and was thinking of using one to build a custom d appolito center. A loudspeaker configuration developed by and named for joe d appolito, in which a high frequency driver, or tweeter, is positioned between two midrange or low frequency drivers that each cover the same frequency range. Joseph dappolito has a speaker arrangement named after him, a vertical array of midwoofer, tweeter and midwoofer. For this online publication, audioxpress kept the original article unchanged. Article about dappolito configuration mtm with adjusted crossover. On a recent exchange with joe dappolito, we asked him if he had. Designer joseph dappolito, whose name is practically synonymous with the paredvertical array, will now work exclusively as snells fulltime.
This soontobeclassic clearly explains the proper way to acoustically test and measure a loudspeaker. Ultimately, accurate results from testing will lead to better designs. He also pioneered the extremely popular dappolito woofertweeterwoofer driver configuration, seen in many successful. A geometric approach to eliminating lobing error in multiway loudspeakers 2000 f2 joseph a. In the above table, d is the vertical interdriver spacing in millimeters, h l is the lowpass transfer function, h h is the highpass transfer function, and a is the crossover spreading factor w nl 2pif c a and w nh 2pif c a.
It sounds smooth and sweet with a nice wide sound stage but the sweet spot is a little narrow. Its a right of passage for sure, but an easy thing to get around by following someone elses design. The mid and highs would be horizontal as normal, but the 12 inch 8ohm woofer replaced by. Using two midbass drivers exciting the line at slightly different points reduces midbass ripple. The midwoofertweetermidwoofer loudspeaker configuration called mtm, for short was a design arrangement from the late 1960s that suffered from serious lobing issues that prevented its popularity until it was perfected by joseph d appolito as a way of correcting the inherent lobe. The 100iwlcr5 loudspeakers which are dedicated to home audio can be highlighted for their acoustics performances and compact design. Feb 24, 2010 here is joe d appolito discussing his design at an event held at audio video design in newton, ma. The d appolito design, more commonly referred to as mtm configuration in the diy world midtweetermid has withstood the test of time and has been the model for some of the worlds finest sounding speakers. The horn is not growing in a smooth fashion, but in abrupt square steps. Monitor audios latest champion bronze moves up a gear from bx and rival budget speakers because bronze is simply in a class of its own. The measurement techniques contained in this book provide all clues you need to refine your speakers components to improve its. Sound waves radiating from the two components in a conventional. One can sidestep most of the pain and suffering their fellow enthusiasts will endure in the wild.
Here is joe dappolito discussing his design at an event held at audio video design in newton, ma. Advantagesdisadvantages of dappolito audioholics home. Long throw woofers and treated fabric dome tweeter dappolito alignment optimized for horizontal or vertical mounting orientation. The drivers incorporate a unique multivaned phase plug mvpp as well as a proprietary computer optimized cone topology which helps them to achieve smooth linear response extending beyond 20 khz. D, whose name is synonymous with the pairedvertical array widely accepted as the ideal arrangement of dynamic. Surely there must be some good reasons for not going with such a design, such as axioms m22ti speaker. The midwoofertweetermidwoofer loudspeaker configuration called mtm, for short was a design arrangement from the late 1960s that suffered from serious lobing issues that prevented its popularity until it was perfected by joseph dappolito as a way of correcting the inherent lobe tilting of a typical midtweeter mt configuration, at the crossover frequency, unless timealigned. Xiangsheng 728a preamp with nos tubes, pioneer elite cd player using optical out to the muse dac, into the crown xls1500 oppo83se, laptop for hires files. Joseph dappolito, contributing editor for speaker builder magazine. Dappolito polar response comparison, left a conventional arrangement using a. However for the single midrange and tweeter, the situation is not symmetrical, because of the phase shift introduced by the crossover. In this case, im following joe dappolitos design legendary speaker designer and the man who invented the midrange, tweeter, midrange mtm driver configuration. Dappolito on what matters audiogon discussion forum. Aes elibrary vertically symmetric twoway loudspeaker.
So i was especially excited when the folks at audiomatica asked me to beta test their latest creation, clio pocket. If you have been designing and building loudspeakers for more than seventeen years, then by now you would probably have rather a lot of pieces of mdf left over. Similar to the larger b100, the b80 sports a highly developed cabinet with an acoustically decoupled chamber for the crossover. The d appolito array is symmetrical with respect to movement up or down, and the result for it is a flipped version of the graph already shown. Bass, midrange and highfrequency drivers are arranged in a d appolito configuration. The b80 has been designed and constructed for natural musical reproduction at any volume level and even hurricane like sound pressure. The proteus to d appolito or not to d appolito, that. Dappolito requested that seas finetune its topofthe line 5.
The sound is so blended, you cant hear the individual drivers. Jul 31, 2008 as snells chief engineer, dappolito will now direct all new product development peabody, ma, july 30, 2008 snell acoustics, a leading manufacturer of highperformance loudspeakers for more than 30 years, today announced that legendary audio designer joseph dappolito, ph. Free wool carpet samples are perfect for acoustic isolation on the inside of the cabinet. The midwoofertweetermidwoofer loudspeaker configuration called mtm, for short was a design arrangement from the late 1960s that suffered from serious lobing issues that prevented its popularity until it was perfected by joseph dappolito as a way of correcting the inherent lobe. Now, with a vertical d appolito arrangement you can sorta cheat this and actually use these distances per side so woofermid and midtweet spacing should be 16.
The midwoofertweetermidwoofer loudspeaker configuration called mtm, for short was a design arrangement from the late 1960s that suffered from serious lobing issues that prevented its popularity until it was perfected by joseph d appolito as a way of correcting the inherent lobe tilting of a typical midtweeter mt configuration, at the. Tweetermidwoofer mtm, also known as dappolito configuration offers improved offaxis response and. Many mtm configurations must be arrayed vertically, rather than horizontally, because vertical placement provides a clear, interference free midrange and treble reproduction to either side. Named after bragi, the skaldic god of poetry in norse mythology. Joe d appolito was certainly the first to describe in engineering terms what the advantages of an mtmsetup are.