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#371 |
diyAudio Member
Join Date: May 2002
Location: Switzerland
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[QUOTEYes, flux density referring to the internal field....... high magnetizing field intensity (a bad combination).][/QUOTE]
I can't follow you here. Flux density is the product of field strength H and permeability. So B is proportional to H. And I don't see where your electric field is coming from. We have electric current in a conductor (voice coil) where the difference in potential between both ends of the conductor in the magnetic gap is benign and therefore negligible. High efficiency systems DO have high control over cone motion but sometimes at the cost of reduced output at their fundamental resonance. When it comes to the advantages of field-coil drivers I can see two points: The magnetic path is electrically conductive and therefore resists against shifting of field lines as a function of the forces involved which in turn reduces Barkhausen noise and nonlinear distortion. A property that it shares with Alnico magnets. The second advantage it does also share with Alnico but it can go much farther: The magnetic path can be driven into very high saturation which makes it very "stiff" and therefore further helps reducing nonlinear distortion. Regards Charles Last edited by phase_accurate; 10th December 2020 at 10:20 AM. Reason: clarification |
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#372 | |
diyAudio Member
Join Date: Dec 2009
Location: Eburg
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#373 | |
diyAudio Member
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My experiences with compression drivers although similar in achieving the excellent sound we desire, run a bit different with respect to implementation. I've had great success with CD/horn combos used with both direct radiator mids and bass, and horn loaded mids and bass. Whether my system is all horn loaded top to bottom, or a hybrid, doesn't seem to matter. What does seem to matter is the degree of tuning excellence brought to whatever the setup. All of my various CD/horn builds have been 4-way, and active 4-channel multi-amps. Whether i need to attenuate the CD or not is a non issue. There's no need to match sensitivity/efficiency between the 4 driver sections, other than for max spl and headroom. Any attenuation is done in the floating point digital domain with sufficient resolution to ensure there are no gain structure/snr issues. I can easily see however, that with passive xovers it's more important to match the multiple sections' acoustic outputs to keep from wasting power, as of course the driver sections have to padded down to the section with the lowest output. I guess the wasted power issue is also more acute when using a single amp to drive more sections. Along with muti-amping, I use dsp for timings, with FIR implementations handling both linear phase xovers and minimum phase EQ's. The digital timing allows the various sections' mouths to be physically aligned in the same vertical plane, and avoids the diffraction issues from having to stagger horn mouths in order to keep voice coils physically aligned. No horns playing over or around each other. The use of FIR, imho, brings many advantages i won't dive into, other than to say linear phase xovers are an absolute joy to use....whatever the order. I see you mention having used DEQX. I've been surprised by how many reports I've heard from users who were less than convinced with what they achieved with it. That always puzzled me until i read the manual. I think it would take quite a bit time and experience using it, to follow their implementation process to full fruition. (It's my major issue with most products that introduce digital tuning, especially FIR file software generators.....they are too dang complicated to promote rather guaranteed success. but i digress....) I feel blessed to have learned the manual implementation of FIR via rephase..... before moving on to more automated methods or structured processes. Ime, the automated methods and structured process can easily do more harm than good, until their capabilities or lack of, are fully understood....(something I'm continually learning). DEQX is a case in point...when you dissect its specs, it really doesn't have that much processing capability to implement its various filters . Please don't get me wrong, they are great units, but I don't think they are fully capable of demonstrating what dsp using FIR implementations can do for SQ. just my 2c, fwiw... ![]() |
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#374 |
diyAudio Member
Join Date: Sep 2006
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I have to say that I am very much much impressed with the knowledge of some of the people who post here. This is what DIY is all about, people looking to pick an off the shelf item to use and enjoy and the people who can explain how and why these products work. Where would we be without the work and research of Harry Olsen, Ed Wente, Don Keele, Dr. Geddes, Dr. Bruce Edgar and many others. A "simple" thing like a compression driver, horns, waveguides turns out NOT to be so simple. I enjoy and learn every time I look at this topic. Many thanks to all those who post here !!!
The topic of "high resolution" has come up several times and is also somewhat complicated. I will try to explain my observations with my particular speaker system. Most of us know how the brain interprets sound is very complicated and still not fully understood so sound quality can be subjective on an individual basis. Some posters here have noted that I use 3 drivers to cover 450hz. to 20k+. I could have easily done this with 2 drivers and have done so.. The 3 driver approach sounds much better, I believe, do to less driver stress. All of the drivers I use have powerful motors, beryllium diaphragms and are very efficient. There is one other parameter, diaphragm resonances, and where they fall at various frequencies. It is my contention that these spurious resonances will get in the way of perceived resolution. Beryllium pushes these resonances further up in frequency then aluminum or titanium thus making them less audible. Just my take. Truextent Beryllium for Audio Domes, Cones and Assemblies Joe |
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#375 | |
diyAudio Member
Join Date: May 2019
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Ripple Tank Simulation |
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#376 | |
diyAudio Member
Join Date: Jun 2003
Location: Chamblee, Ga.
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GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents. Last edited by GM; 10th December 2020 at 07:50 PM. |
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#377 |
diyAudio Member
Join Date: Jun 2003
Location: Chamblee, Ga.
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For sure the room dominates, so truncated horns loading just enough to couple to the HF suffices, or in many cases, just use [multiple] H.E. [horn] drivers in a sealed or damped vented alignment depending on the desired efficiency/cutoff point.
GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents. |
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#378 | |
diyAudio Member
Join Date: Feb 2019
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#379 | |||
diyAudio Member
Join Date: May 2018
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camplo,
most importantly, for low distortion, in any electrical interface (boundary conditions), the pressure difference must be small. phase_accurate, Quote:
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Electromagnetism is everywhere. It is also a prerequisite for life. Quote:
¤ You won`t be able to show that higher energy implies lower distortion, which should defy common sense in the first place (but it does not). |
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