Like many of you, Ive had subs in the past. With the Magnepan speakers, its harder to heard exactly where the left and right speakers are. Though Coherent Audio is a small Canadian company run by what seems like a husband and wife team, local audiophiles seem to have heard of their speakers. The impedance curve allows it to easily be driven to good volume with my MAC 1500, only 30 wpc. Science has proven a bumble bee can't fly but it does. At its hottest the chassis gets up to 45 Celsius. and the Nasa physics website stated that the speed of sound in air is constant, and does not vary with frequency. Their Live Act Series 115 (LAS 115) is the closest model to the top of the line Retro 15 from Coherent. It's what makes this "Hobby" so great. You have your choice of any amplifier. A speaker might produce a certain frequency, as intended by the artist. In 2018, Edwin Wong founded the Risk Theatre Modern Tragedy Playwright Competition with Langham Court Theatre to challenge conventional Aristotelian, Hegelian, and Nietzschean interpretation of tragedy. baffle, and by employing first order crossovers (that is the single most coherence is by physically offsetting the drivers, in our case by slanting the frequency bands - to send bass to the woofer and treble to the tweeter. And are they being used correctly in the loudspeaker marketing material? What we are talking about is the time that elapses between the arrival of the electrical signal at the input of the driver and when the acoustical signal leaves the driver. Most speakers just try to reproduce all frequencies at the same They could produce subterranean bass that energizes the room. The speakers were downstairs, and I had a home gym upstairs. COHERENT AUDIO A CUSTOMIZED AND HANDCRAFTED LINE OF HIGH SENSITIVITY COAXIAL LOUDSPEAKERS DESIGNED AND BUILT WITH GREAT CARE AND ATTENTION TO DETAIL TRUE TESTIMONIES OF FRANK FAZZILARI DESIGN AND QUALITY THE NEW 2022 LINE CUSTOM MADE LOUDSPEAKERS - PRODUCT OF CANADA "THE EIGHTEEN" Flagship Floorstanding Loudspeaker Then there are the Tannoy Ardens, another 15 dual concentric speaker. Does it make a speaker "sound " better? These sonic blades are carefully placed with proper geometry, length and height. Ive had tubes in the past, having built single ended 300B and OTL kits (I build speakers too, which is great fun). Most importantly, much cheaper drivers can be made to do the job. The only variable in the speed of sound is the density of the medium(air) which will cause variations according to altitude, and humidity, or barometric pressure. "In the time domain, the Angelus's impulse response on the tweeter axis (fig.5) appears time-coherent, due to the combination of its crossover's performance--first-order high-pass to the tweeter, fourth-order . As a result, the cabinet size of the Retro 15s is about half the size of the La Scala, which is massive. I've been reading about them lately at. How ever, the thought of lobing effects have caused me concern. The Retro 15s, however, blow this legendary speaker out of the water. I believe that the Vandersteens and Josephs are time coherent. The horn colouration, if anything is an advantage. The Platinum version can be crossed at as low as 600Hz. And since many owners of horn speakers will be using low powered tube amps based on 300B or 2A3 tubes, the bass will have the bloomy tube sound. The phase angle is all over the place. Heroic crossover design can ameliorate this, but with a coaxial speaker, time alignment happens automatically. Time coherency is a funny thing, a lot of people go to a lot of effort to make things time coherent, but in the end, they will only be time aligned at a single spot. You see, the 5200 series Radian drivers were designed for punishing commercial use. Enter your email address to subscribe to this blog and receive notifications of new posts by email. It has to be precise. The time consequences of crossover Thanks, Thanks for responding. The Hsu ULS-15, a sealed 15, was actually quite nice. Most Single Driver speakers use the bass drivers cone geometry as a wave guide for the compression driver. Made of 2"-thick MDF, the main baffle sits on a 1/16" layer of Keldamp, a proprietary damping material used liberally throughout the Shearwater, and to particular effect in the separate sealed subenclosure at the bottom of the cabinet, which houses the crossover. Full-range frequency extension or minimonitor coherence? Sounds like Coherent be fine with my set up. Tannoy uses the curvelinear mid-woofer cone as the HF waveguide, rather than having a separate central horn. stuck, just keep reading. there's no single idea upon which the whole argument It was a pleasure to write a review of your speakerstheres so many things that the Retro 15s do well, and exceedingly well. Hence the listener hears something quite different from what is actually on the and form a point source. Are full range driver loudspeakers time/phase coherent ? But their ability to do this comes at the expense of recreating the exciting and visceral punch of rock music. First, the spatially averaged responses for the Solos (p.117) reveal a variation in response of 6dB from 60Hz to 3500Hz with an almost 4dB depression between 2200Hz and 3500Hz. This discussion regards the engineering principles of time coherence as well as the important An example is a 4th order xo with 360 degree phase shift, you're still in phase but not time aligned anymore. Now we're getting somewhere. Perhaps some of that is due to the very small super-tweeter mounted just above coincident drivers. Who needs such inefficiency anymore? Time Coherency itself is usually done at the crossover on well designed speakers. Far fewer speakers are really time-aligned than you might think. "We terminate a shortened transmission line in a low-Q vented alignment that makes for a slightly more benign impedance," explained McGinty. I've been doing some simulation on how to convert a regular speaker to time-phase coherent. The pair of Ardens I auditioned, for example, must have been 40+ years old. "It also dissipates the woofer's backwave by forcing the acoustic energy through a long, convoluted set of internal baffles, plus some resistive stuffing so that the air will work against an even larger surface area of absorptive material.". The drawback is that a fixed listening position (in this case 8 feet) is incorporated into the design, and the speaker needs to be precisely aimed at the listener. NEXT When I heard PWK talk at a hi-fi shop many years ago he said he admired stats for their low distortion. I have been in the speaker hunt rabbit hole for a while now .Wanting to replace my Vandersteen Sig Iis Which have owned for many years now. Because crossover circuits are hidden from view and somewhat hard to understand they are often overlooked by the press and disregarded by buyers as an issue in speaker design. And with the Magnepan speakers, youre sitting 20 rows back, like it or not. Time and phase alignment are necessary to stable, accurate imaging performance .. Heres a midrange designed driver that minimizes reflections from the backside of the cone. BUT that doesn't stop me from saying that I still prefer the "sound" of a well-worked-out time- and phase-coherent speaker. A 3 horn loaded driver handling the frequencies above 800 Hz is built into the dustcap of the 15 treated paper woofer, hence the coaxial designation. The aforementioned speakers all received glowing reviews, and range in price from $2497/pair to $9000/pair. Although sealed subs may be more musical, a vented sub puts out power. Edwin, great review! I believe that the Vandersteens and Josephs are time coherent. The cabinets: Thin walled semi-monocoque designs for wave cancelling and sonic range with a side benefit that Frank doesnt break his back lifting them. Thanks Matt. This is fresh and refreshing. 3. The La Scalas, on the other hand, tend to grab you more viscerally. Autoformers are much more expensive than resistors. I also own Coherent speakers, mine are the 10 floorstander version and I love them. With coaxial speakers it is possible to have proper alignment at more than a point or a plane.With Altec 604 and 605 Super Duplex s, The high freq horn is several inches behind the woofer. Coherent Audio is something we've been waiting on for a very long time. Fortunately, for us music lovers they left the drivers alone. Interestingly, the Dunlavy's seem to have overcome a bit of this vertical sweet spot compromise. I think the low distortion of both stats and good horns is what makes stats attractive to many hornies. How do the Coherent Retro 15s compare to the Magnepan Magneplanar 3.7i? And the JBL I wanted to hear because JBL is a legend and the K2 was there attempt at a state-of-the-art horn design. Images were more precise, with more sense of space. Time coherence is as important as the amplitude response measurements typically taken. For a better experience, please enable JavaScript in your browser before proceeding. I think we could discuss this subject for a long while and get very technical. And even it wasn't quite as dynamic as the 2CE or 2Ci from earlier in the 1990s. And what about that 2nd diver we mentioned? http://speakers.sub-optimal.net/thumbnails.php?album=16, http://web.mac.com/donaldpatten/iWeb/X-Over/X-Over.html, 2-way loudspeakers : phase coherent vs non phase coherent. Tannoy uses the curvelinear mid-woofer cone as the HF waveguide, rather than having a separate central horn. JavaScript is disabled. At first, I thought he meant "audiophiles more seasoned than you" but upon rereading, I interpreted it as "a number of seasoned audiophiles voted for us at that show -- more than voted for any other system". Great for all of us that actually have a life and not perfect listening rooms. I am aware of only a handful of time aligned (and/or phase correct) speakers. divide the signal into And Im sure it goes for six-figures. I've listened to time aligned speakers, and I've messed wih my active changing the time alignment.. A simulation with actual drivers and how to design a 1st order/time phase coherent speaker. I find that the main difference lies in the imaging performance of the speaker and the sense of space they create. Now another interesting thing about all these high-efficiency horn speakers (the Retro 15s, La Scalas, Ardens, and K2s) is that, while they seem to pump prodigious bass out of huge boxes, they dont actually go that deep. You want it all to arrive at the same time. So for many speakers the correct time/phase may only exist at one location in space and if it's so important . But, to me, theyre out of control. At my new place, its quite overkill. The software is Xsim which has enough basic stuffs for basic simulation. Both the Cornell physics dept. In non-coherent speakers the output signal doesn't look like the input signal, and that descends from using steep filters." The Shearwater therefore uses a slanted baffle and a time-coherent, first-order crossover, a single inductor . JavaScript is disabled. Sounds great to me. Every speaker design is a compromise. The sound is wonderful. Ozfly, at the risk of appearing petty, Joseph still couldn't. specifications commonly used to describe speakers dwell almost entirely upon frequency and amplitude while Low order cross-overs, preferably of the series type, now seem to be the preferred (but not sole criteria) speaker type for Mr. DeWulf. Starting at US$14,950, + $300 Drop Ship Charge, it is not inexpensive, but it is one of the finest high-efficiency speakers available for use with low power SET amps. Don't see something you like or want to match a decor? Almost. I've been reading about them lately at GMA's website . Curious how long have you owned and how did you discover Coherent? Edwin, I am inches away from ordering a set of 15s. Sansui AU-666 (vintage solid state Frank told me this was the first amp he ever bought) Wilson Audio Specialties Alexia V loudspeaker, Tannoy Stirling Prestige Gold Reference loudspeaker, Triangle Antal 40th Anniversary Edition loudspeaker, Multiple Premieres at PAF from JMF Audio and Ideon Audio, JVS's Best of PAF 2023: Dutch & Dutch 8c all-in-ones, Twin Showcases from Spatial Audio Lab with Don Sachs and Lynn Olson Design, Great Sound: Popori Acoustics Electrostats from Notable Audio Products, CH Precision, Ideon, Magico, and more from Audio-Ultra, Wells Audio Performs with Honor at Pacific Audiofest, Linear Tube Audio, Daedalus, WyWires DanceTake One, HiFi Rose RS520 streaming integrated amplifier, Antipodes Oladra server/streamer/reclocker. Complex speakers without tend to sound 'messy' to me with the drivers competing for supremacy and the cross-over points quite audible. CRITICAL ISSUE Vandersteen tries to get his speakers to perform in a manner that preserves this waveform and even though the phase angle does change, it is not going far in a positve or negative direction unlike some speakers. Franks speakers are truly a hidden gem. Sound Lab U790 ("ultimate" steel frame, seven foot tall panel, 90 degree radiation angle). The nice thing about vintage is that you can enjoy the speakers for a few years, and turn around and sell them for the same price. Are you still as happy with yours as you were when you did your review? Comments appreciated . An octave is either a doubling, or halving of frequency, and six decibels means either a quartering or quadrupling of Anyone who has heard a time coherent speaker give your comments about them . And, every once in a while, when a recording has deep bass (Bach organ music, Andy Stott, Portishead), one is rewarded. Another difference between the two is that the bass driver on the La Scala is a folded horn (a type of compact horn). My point was that to each individual,truer takes on a different opinion. The green mountain speakers look like a serious acoustics experiment, not a piece of furniture. Karls, thanks for the clarification. The GoldenEar Triton References were appealing because their low-end has been compared to that of the legendary Mirage M3s, a speaker I lived with and enjoyed for many years. They are, however, much more efficient than resistors, which dissipate the power produced by the amplifier as heat.
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