How to replace ferrofluid in tweeter

How to replace ferrofluid in tweeter. Connect the tweeter negative wire to the L-pad common ground (-) terminal. I have read several threads on changing the ferrofluid in old speakers, and wondered if anyone has done this with these tweeters. Connect the amp/crossover positive output to the L-pad positive input terminal. There are kits to refresh the ferrofluid, and new correct tweeters are available for relatively low cost. Shows how to remove and replace the ferrofluid, and keep the old diaphragm. Dec 3, 2013 · Yeah the ferrofluid sucks - I bought 4 meridian in wall speakers that needed tweeter replacement because the fluid had thicken/muddy up ( I took one apart and it looked like oil that had been in a engine for a long time) I also had some mcintosh speakers that had multiple tweeters that went bad/ lost output also- parts express sells ferro fluid but I don't know how well it works - KEF tweeters are robust and tough, but still be careful. As the fluid starts drying out, the performance (sound quality) will start to suffer. Nov 3, 2016 · The tweeters already sounded rather 'brash', and on strip-down, I think that was partly the loss/congealing of the original ferrofuild, partly the deterioration/breaking up of the coating on the domes. Usually performance declines audibly after 5 years and sometimes as little as 2 years. A recent service call customer had purchased a pair of Paradigm Re Mar 25, 2017 · Mar 25, 2017. In the previous article we covered a bit of tweeter history, discussed the cone tweeter, and introduced the common dome tweeter. Comes complete with cleaning strips and instructions. I just viewed 2 B&W repair guides: 1. Picked up some KEF C55 bookshelf speakers and one of the speakers has the gummy ferrofluid muffled tweeter problem. Sep 23, 2009 · Using a magnetic ink developer (MICR) seems to be the easiest way to make a smooth ferrofluid at home. blogspot. Apr 23, 2014 · The K-77 tweeter was adopted in 1957. Sep 23, 2023 · P5 has the same tweeter. The Energy 22 tweeters were known for failure after the ferrofluid finally dried up. If you can, it might just be easier to replace the tweeter. Replacing the fluid should be done as a maintenance issue - if you can - try to get the same viscosity rating the manufacturer used (this can be difficult). #3. With ferrofluid at a little over $3 dollars (1" tweeter) at Parts Express, I figure its worth a shot on the tweeters I pulled out. I just fill the magnetic gap around the pole piece up 3/4 of the way, allowing room for coil displacement. Nov 9, 2022 · Not all 1" ADS tweeters were made without ferrofluid according to the manual for the L1590's. not that interested in having fluid replaced, but it's an option. Sep 27, 2014 · Start by removing the tweeter with housing from the speaker. The ferro fluid comes out easily with the blotter paper and the fresh ferro fluid practically jumps out of the tube down into position. I am continuing to look into exact model replacement. Feb 19, 2017 · Feb 19, 2017. Jul 23, 2011 · Ferrofluid is mostly there to wick heat away from the voice coil. Jul 13, 2018 · Is there a way to test / check ferrofluid performance? I have a pair of ScanSpeak D2905/970000 that have been sitting for two years, still boxed. As an example, the speakers I am building right now have a 6. com/p/speaker-repair. On the other hand, there are a couple of companies in the Montreal area but it's pretty expensive ($79 for 3-2oz bottles). Is there any easy way to inspect or test them in some way? For reference, one pair is the ADS L690 which seem to have been Jul 16, 2019 · HOW TO REPLACE VOICE COIL METAL DOME TWEETER? Crown metal dome 150Watts Jul 2, 2013 · Hi, A practical question I ask you guys. Our ferrofluid kits come with pre-measured packets of ferrofluid which are used to replace the old fluid in speaker air gaps Dried Out Ferrofluid : r/diyaudio. Large ferromagnetic particles can be Mar 24, 2020 · Silicon new tweeter onto the old face plate. The coil of modern tweeters is sometimes damped with ferrofluid - this is to improve the sound quality. Basically the T33 is the best tweeter for the job. Dried Out Ferrofluid : r/diyaudio. In a lot of speakers the end of life is not determied by ferrofluid, but from other components. Thanks! MH What are ferrofluid tweeters? Many speakers produced from 1990 until today have (metal)dome tweeters damped with "ferrofluid. Ferrofluid replacement is pretty simple, you just need to soak up the old stuff, clean the slot, then put the new fluid in followed by the diaphragm / voice coil assembly. May 24, 2013 · After soldering the first tweeter, we discovered the faceplate of the new tweeter was smaller than the old one. Mar 8, 2023 · Both the shape and the material it's made from have a direct impact on how your music sounds. If you hear music, the tweeter obviously works. Dec 18, 2022 · Perished ferrofluid, that is no longer liquid but has dried out to a paste, can stop voice coils from moving rendering tweeters, and I suppose other speaker elements, silent. Revel CS line is no longer in service. This began the trend of using ferrofluid in tweeters and eliminating the spider (damper) in tweeters. Change the cabinet connectors to a pair of 5. Sep 6, 2017 · Remove tweeter from cabinet, disconnect wires from tweeters (make sure you label where each wire goes, easy as there's only two wires) set multi meter to Ohms (lowest or next to lowest setting, like 20 ohms or 200 ohms) place meter leads on tweeter terminals. It is a colloidal liquid made of nanoscale ferromagnetic or ferrimagnetic particles suspended in a carrier fluid (usually an organic solvent or water). It should be used to replenish drivers treated previously with ferrofluid. It is available at parts express for very little. Hello, I have a pair of infinity small bookshelve speakers model sm82 with a bad tweeter. Dec 28, 2022 · Yes, red dot is positive at the tweeter. These sound great in combination with Sanyo Plus pre/ power. Apr 28, 2015 · Kef 104/2 speakers, with dried up KEF T33 tweeters, repaired with new ferrofluid Replace ferrofluid by yourself - a manual on the basis of a B&W DM500 and DM600 series (ZZ05460) tweeter. I have replaced all of the foams and the speakers sound pretty darned good. AV - Panasonic HZ2000, Cambridge Audio CXU. There is a definite and real change in the specs of the tweeter, as it is easy to observe the effects that differing amounts of ferrofluid have on a drivers impedance curve. On most of the the coil came unglued from the tweeter dome. 100uL for 1" voice coil. Oct 15, 2011 · Oct 15, 2011. Here is the best info I can offer you based on my research and own experience. Jul 9, 2012 · Re: Ferrofluid longevity To your first questions about what happens when ferrofluid "disappears". Is it advisable to clean and replace the ferrofluid in your tweeters since they are 27 years old? Is there a way to tell when the ferrofluid has dried up? Greetings and thanks for answers. This guide provides basic guidelines to help in selecting the right audio ferrofluid, depending on magnetization, viscosity and carrier type. Parts Express offers a kit to replace the ferrofluid, but they don't go into detail . 2. I've got these vintage Magnat speakers, All Ribbon 10 Pii exc. Your speakers tweeters may not be susceptible to this phenomenom, I don't know for sure, but if they are you risk permanently damaging them. Having said that, most tweeters have more or less the same build / design, and from the information I have so far I have no reason to assume different manufacturers Apr 28, 2012 · It makes the caps in the tweeter smaller, and reduces the distortion in the power amp by being a higher impedance load. com sells it). May 31, 2020 · A bit of a sideways question: does the ferrofluid also dry out if the tweeter is stored in a plastic bag? In other words, is it possible to buy replacement tweeters and store them for 20-25 years without the ferrofluid drying out (which would defeat the purpose of buying replacement tweeters)? Feb 3, 2023 · The mid and bass sound fantastic, but not the highs. Sep 26, 2014 · Tweeter rebuild was necessary for 20 year old speakers as hf was certainly too grainy. Our ferrofluid kits come with pre-measured packets of ferrofluid which are used to replace the old fluid in speaker air gaps when replacing diaphragm and coil assemblies. Here you find a roadmap for replacing ferrofluid in a number of pictures. Check the B series manuals and you should find the answer. I have read a few forums that recommend using the Morel MDT29 tweeter as a replacement for the KEF 107. It is held in by 4 phillips head screws. Jan 2, 2017 · Ferrofluid is a cheap solution to building a tweeter that will perform well for about 5 to 10 years. Even though the word 'original' might seem seeclear and unambiguous, it is not. The magnetic particles are Magnetite (Fe3_O4). You can call Vifa and try to get an amount to meter out, but I don't think it's that precise of a procedure. Here is a link to the Fleabay replacement: Jun 11, 2016 · I am concerned about buying used replacement D28 drivers because of the ferrofluid issue. On the bottom line, Ferrofluid is like any other compnent in a speaker an extension in degrees of freedom of trading parameters against each others. Ferrofluid is a special magnetic liquid that we use in some speaker parts - almost all tweeters, some midranges, and a few woofers - to achieve two goals. Jun 18, 2018 · I dont have these tweeters but have recently redone the fluid on 4 x KEF T33 tweeters. I got the ferrofluid from Parts Express. Ferro fluid is no toxic. I have also recently seen a listing on Fleabay that claims to fix the original tweeter by replacing the Ferrofluid. They require 9 Ohms series resistance by the time the crossover was complete with all the notches and shelves to match the Mar 16, 2020 · Instead of air (a good thermal insulator) keeping the heat on the voice coil, the ferrofluid transferred the heat to the magnetic structure and it was a centering force on the coil. If you go too long with dried up ferrofluid, the tweeter may be permanently damaged. Ferrofluid, it depends and how hard and hot the tweeters were driven will affect it too. Hopefully it is helpful. Tweeters reproduce the upper frequencies in your music — the vocals, guitars, horns and other high notes that make the music sparkle and come to life. The kits listed are Feb 3, 2023 · I only have one more clip white adding the Ferrofluid. Need some advice. Ferrofluid improves the performance of high frequency and midrange drivers. The Vifa uses hex screws, the Monitor uses torx screws. Dec 16, 2014 · It is fairly simple to replace the ferrofluid in the T33 tweeters. Tweeter diaphragms usually have mounting slots to self-align, right? Maybe ADS is different in that regard. I have a set of d26tg-05-06 out of a pair of Dahlquist M-905 whose ferro fluid is completely gunked up. [1] Each magnetic particle is thoroughly coated with a surfactant to inhibit clumping. I was able to source replacement for the original fluid, but tweeter rebuild is not finished yet. but I think the ferrofluid in the t-33 tweeters is likely dried up as the highs are a tad muted. For fun, I took the tweeter apart after confirming that it is "open" between terminals. Shows how to remove and replace the ferrofluid and replace the diaphragm. Reduces distortion. Over time, however, the ferrofluid hardens and must be replaced. In some cases, the tweeters quit working. (Blue = Negative) Put it all back together and done Of the two pairs I have here, there are minor differences. After reading a lot of postings from the internet, I suspect the FF may be the culprit. Jul 24, 2006 · as many KEF owners with ferro-fluid cooled tweeters know, the gel hardens over 20 years and basically renders the tweeters useless. But before you take the trouble: a lot of the T33's don't perform any more and a lot of restorations end up in tweeter replacement. You have to clean out the old dry ferrofluid first as shown in those online videos. Ferrofluid is a liquid that is attracted to the poles of a magnet. 2mm females. The T33s in my KEF 104/2s took about a half hour for each tweeter. Thought this may be of interest to some. Apr 28, 2015 · A dried up KEF T33 tweeter, repaired with new ferrofluid Jun 19, 2018 · But I want to be proactive and assume the ferrofluid needs to be changed. Trying to put together a vintage system for a friend. You'll eventually be able to tell something isn't right in the sound, the response in the crossover region mellows (dips) for starters. Some of the advantages in using ferrofluid include increased power handling capabilities, smoothing of frequency response curve and reduced distortion. Sep 21, 2023 · In this video I guide you through the complete diagnosis and repair process of some Alto Truesonic TS315 active full range PA speakers I've currently got in Ferrofluid improves the performance of high frequency and midrange drivers. I learned that ferrofluid is nice feature to peoples who buy new speakers but pain in the ass for anyone who will like speakers older than 10 years. Without it a tweeter can actually sound better in some cases if tweaks to the x-over are made. Generally there is a distinction between the 'original diaphragm' and the 'aftermarket diaphragms’. Mar 18, 2013. Picked up some KEF 107'sall drivers in great condition and they sound very good. Can I simply take it apart and clean the ferro-goo out Sep 11, 2019 · I've tried both Midwest Speaker Repair replacement tweeters as well as a mis-matched pair of original T33s and think I prefer the sound of the original tweeters with the ferrofluid replaced, so would recommend doing this as others mentioned. On all of them the ferrofluid is well past expiration. I can see that it has a bad voice coil as it is visually obvious that the very small cooper Jun 28, 2023 · I consider this type of repair to be the most difficult one I perform to repair speakers. Paradigm domes aren't available any more but the ScanSpeak Voice Coil (600058 from Madisound) work with some modification. The oil is a long-chain type allowing the smaller magnetite particles to be homogenized. Jul 20, 2023 · Hello everyone. It feels kind of dull and not as lively as the 107's tweeter (T-33) - I AB'd the two speakers. May 19, 2021 · Tweeter, headphone, high frequency compression driver, multimedia 22–33 Midrange, full range, midrange compression driver, siren driver 33–44 Woofer, subwoofer, siren driver and The viscosity value of the ferrofluid should be selected with respect to the desired amount of damping at the speaker’s resonant frequency. Ferro Fluid (original) should arrive tomorrow, How to disassemble a 1 inch / 25mm SEAS h211 ferrofluid tweerter for cleaning/change ferrofluidMission 770 speaker just arrived a few day ago , decide to ope Dec 3, 2023 · Connect the tweeter positive wire to the L-pad tweeter output (+) terminal. Tweeter Autopsy. Much research hasn't resulted in definitive answers. Paul graded these into high, nominal, and low, and had three different Klipschorn network “versions” to accommodate them. Whilst taking them apart one of the voice coils got slightly knocked. Mar 9, 2021 · He had reconditioned the speakers and rewired the tweeter but could only get one to 6 db of the other between 6 to 10 kHz. Jun 10, 2022 · The premium series from Ferrotec has >10× the lifetime of older series. . One is improved cooling, where it provides a better thermal coupling of the voice coil with the magnet structure that can then act as a heat sink, and the other is mechanical damping Oct 16, 2021 · Apparently importing ferrofluid into Canada has been illegal for a few years. In the early years of production the level varied several dB. Replace ferrofluid by yourself - a manual on the basis of a B&W DM500 and DM600 series (ZZ05460) tweeter. Jul 2, 2013 · When a tweeter has a mucky ferro fluid in the gap it's already running way beyond it's original spec's. 4mm 51-HFLM1 ferrofluid tweerter for cleaning/change ferrofluid Nov 25, 2013 · Now, that bunch of 10 to 20 year-old speakers all have tweeters where the ferrofluid has dried hard. " The concept is that the viscous fluid containing microscopic metal parts, magnetically held in the tweeter voice coil gap, damps resonances as well as cools the voice coil – thus improving sound quality and prevent Feb 4, 2017 · I recently was given a pair of Boston Acoustics T930 II speakers that a friend wanted out of her house. htmlWe offer a complete speaker repair and restoration service. Sep 7, 2019 · How to disassemble a 1 inch / 25. #8. Oct 15, 2019 · I've got two different brands and both had some changes near their model run that did use the ferofluid tweeters. It ages--gets gummy and can make a tweeter sound "dull". If you get no reading tweeter is bad, wire most likely broke in winding or from Mar 18, 2013 · Active Member. e Nov 9, 2022 · Not all 1" ADS tweeters were made without ferrofluid according to the manual for the L1590's. #2. I just uploaded it to the Youtube and the link is shared below. One has three screws to mount the tweeter to the cabinet, and the cabinet is a pure straight hole. About diaphragms. Now replace the front plate of the tweeter that holds the voice coil assembly in place. They ofer significant performance advantages in tweeters, mid-ranges, woofers, compression drivers and automotive speakers. Increases power handling. The best analogy for ferrofluid is motor oil in your car. View attachment 2710106. When the time comes, it should be possible to replace the tweeters with a version made by a different company, but this would take care to ensure a physical fit, and would probably cause the frequency response to change somewhat. Ferrofluids have been extensively used in audio speakers for over 30 years. Install ferrofluid once gap is clean and before diaphragm is mounted. Mar 26, 2016 · Mar 27, 2016. how can I open it to replace the ferrofluid to get the tweeter working again? HCG said they had tweeters in stock, only to find they gave me a ALPHA link instead of beta, and calling them confirmed they got nothing. And I haven't researched to see if these tweeters even used ferrofluid. 8 Ohm "nominal" Seas tweeter. Dried Out Ferrofluid. Replace ferrofluid in tweeter. I recently replaced the tweets with a model that is close (d26tg-35-06). #19. i recently traded my Bozak 302A Urbans for a pair of 104/2. Mar 6, 2020 · Hi there! Anybode got reliable info about how to replace Ferrofluid in 1" Tannoy Titanium Tweeters (6189 0063) from 2004 (199X-20XX?? i8, V8, etc. Close-up of the tweeter on a 2-way car speaker. Inspect new diaphragm for defects or damage. Repeat with new pieces of tape until tape emerges completely clean. Depending on the age of the driver, there is a strong possibility of the fluid being in need of replacement. Replacing the ferrofluid is a good idea on 10 year old tweeters. If your driver had ferrofluid you can still clean gap and you can purchase separate tubes of replacement ferrofluid. Like with these. Then place the voice coil back into the gap (carefully - bend the coil former & you've got a throw-away). another way is to take a AA battery and place the +/- wires on the ends Jul 12, 2017 · It all comes down to the voice-coil former & glue used to hold the wire in place. In others, the amplitude is reduced and the speakers sound "muffled" (and you thought you were losing your hearing!). In this article series about speaker parts we now explore the tweeter, a class of transducers designed to reproduce the upper range of audio frequencies. Service the tweeter every 10 years and you will be fine. It has a poly cell high output tweeter # 902-4270. He said that the tweeter was, itself, a replacement of the original, and that it was wound wrong and losing its magnetic response (no idea if that makes sense or not). he's really nice and offered to give me cash to buy the KEF recommended replacements. Besides that I have uploaded all the pictures I took while doing the Ferrofluid replacement in the previous posts. Let us know how you get on. For most compression drivers, repairs, and diaphragm assemblies. The old stuff was dark and vicious. Primary factors are age, storage conditions and whether the speakers have been regularly driven hard (heat)--basically the same factors that impact caps (and motor oil in your car). The crossover is specifically designed to work with it and I believe this is why all the accounts I have read have stated that the best replacement is the original. They were down about 7db across the range. I did the T33 tweeters in my KEF 104/2 speakers a few years ago and it made a significant difference. Draft. They're also vital for proper soundstaging and May 24, 2023 · The ferrofluids main job is to keep the voice coil cool under higher power but also acts to dampen resonances in the tweeter response. Simply purchase a $19 bag of developer and add some veggie oil. This failure apparently came on gradually and I had failed to Mar 10, 2020 · Typically ferrofluid lasts about 15 to 20 years with normal use. 3uF cap and small inductor across to +ve), thereby indicating that the tweeters are intentionally connected out of phase with the bass/mid unit, which is not uncommon due to the driver centres of radiation being on different vertical plains (i. KEF recommends replacing ferrofluid after 15 years. Then, remove housing from tweeter. The replacement tweeters are ~$200 dollars from Meridian. I recently discovered that the tweeters in my 26 year old B&W CDM1 bookshelf speakers had ceased to function. I was told that 105/3's tweeters are very fragile and very hard to replace the FF without damaging them. Ferrofluid Repair Kit. They have the CFT5 tweeters. The correct thing to do in this situation would have been: a) Pause all work. On the internet you will find many vendors that offer replacement diaphragms for your tweeters. Nov 3, 2016 · There is a lot of information regarding the fragile nature due to dirty gummed up ferrofluid of many vintage KEF tweeters. c) Tell Darrell to go home. Hi sorry about the sound I think I sound strange but I hope it helps you sort your speakers I am planning to sell mine as I am getting some new kef r11’s whi Jan 4, 2014 · Minnesota morning. Ferrofluid & paper is not a good match as it will soak in and eventually ruin the former. should have hooked the KEFs up while the guy was here, but such is life. It works by damping the impedance at resonance to effectively lower distortion Jul 2, 2013 · When a tweeter has a mucky ferro fluid in the gap it's already running way beyond it's original spec's. Feb 15, 2020 · Feb 14, 2020. Visually inspect (with magnifying light if possible) to insure no dirt or debris remain in gap. There are several ways to test the tweeter. The ferrofluid has dried up to become just iron filings. Purchased in 1996 and manufactured in the same year. Even a change with a ferrofluid for a midrange will have a positive result. Have not seen the insides of a -0107 in decades but if memory serves some of the early ADS tweeters used paper formers while later ones used aluminum or kapton. Sometimes a manufacturer will buy from another Mar 25, 2020 · Styles, Dome Tweeter Variations and a Balanced Drive Tweeter. They appear to be in near mint physical condition. SYMPTOMS: Sep 27, 2013 · Sep 27, 2013. Ferrofluid for tweeters roughly comes in 2 kinds: the stuff that dampens the resonance and the stuff that does not. However the L1590/2 used the 3/4" tweeter, which ferrofluid was used. For questions about specific ferrofluid series, ferrofluid applications, or to place an order, contact your Ferrotec ferrofluid solutions representative or use the Ferrofluid Inquiry Form. Ferro Fluid Kits. Cheap tweeters use a high viscosity oil for damping, woofers use a low viscosity oil. KEF offers NO replacement options! Madisound is recommending the Morel 29's Repair of blown tweeter speaker and replacement of voice coil and ferro fluid Apr 7, 2024 · The tweeters seem lik they are sealed backing with no screws to open it. I don't know which one you need. Meanwhile I managed to clean out the sticky stuff, the magnets are now clean. I really want to see - I mean hear, what the speakers sound like without the tweeter coils being mired in goop. Sometimes tweeters are modded by removing the fluid. May 31, 2020 · A bit of a sideways question: does the ferrofluid also dry out if the tweeter is stored in a plastic bag? In other words, is it possible to buy replacement tweeters and store them for 20-25 years without the ferrofluid drying out (which would defeat the purpose of buying replacement tweeters)? Dec 1, 2022 · I am about to replace the ferrofluid in my KEF NT25 SP1276 tweeters from my 103/4 SP3131 speakers. Once out, you will disconnect the two speaker leads (Green (-) and Blue (+)). Using a lower-viscosity oil Feb 26, 2024 · Feb 26, 2024. 1. I found a set on an auction site listed as NOS. Jul 16, 2019 · Crown metal dome 150Watts Mar 24, 2020 · Silicon new tweeter onto the old face plate. Sometimes a manufacturer will buy from another Feb 15, 2012 · Yes, the CDM1 tweeter suffers from ferro fluid drying up. 2 Ohm Re. Our specialty is vintage speaker restoration a Jan 1, 2022 · But with age some say that ferrofluid in tweeters dries out and gets sticky, and to maintain/recapture the original performance the ferrofluid should be replaced, or the tweeter entirely replaced. How long can i expect things to work fine? These speakers Mar 3, 2017 · I have 5 original paradigm tweeters to fix. Feb 1, 2004 · Improperly designed tweeters have their voice-coil formers fall off the dome when used with ferrofluid. From what I recall of the crossover, brown (or grey) is taken directly from the negative terminal (with 3. I'll take some pictures of replace the fluid when my order comes. I say proceed with caution with regard to the removal of the ferrofluid. Connect the L-pad ground terminal to the negative amp or crossover terminal. With care, it can also upgrade most drivers that have never contained ferrofluid. You can easily get access to the magnet and gap with the ferrofluid, the diaphragm of the CDM1 tweeter is simply 'clamped' on the magnet. I don't question that at all, as I simply do not know. Just replaced the tweeters in my pair of Royd RR2. Nov 27, 2013 · Once clean, add a SMALL amount of new ferrofluid (Parts-Express. But both tweeters and dome midrange drivers are of the ferrofluid type. It works by damping the impedance at resonance to effectively lower distortion, smooth frequency response, and increase thermal power handling. Mar 1, 2023 · 2023-03-01 10:08 am. Feb 23, 2023 · I redid the ferro fluid in a pair of energy shadow tweeters in about 45 mins. One way is to open the box of the good speaker, and place the +/- wires on the corresponding solder points of the crossover. Best Regards Dec 11, 2022 · Hi gang. Tweeter works, but is clearly hampered. Jan 5, 2014. If you don't change the ferrofluid the thickening ferrofluid will limit coil movement and Mar 16, 2020 · Instead of air (a good thermal insulator) keeping the heat on the voice coil, the ferrofluid transferred the heat to the magnetic structure and it was a centering force on the coil. ) ? Like: how much to apply and where to buy? There seems to be different viscosity and magnetic propierties. #1. I have a pair of B&W DM602 S1 speakers. A few years into production the consistency improved significantly, and the practice was dropped. #14. The ferrofluid is inexpensive, about $12 plus shipping for two 100 ul tubes from Parts Express. b) Contact Polk Audio and inform them of the mismatched faceplate size. SDS. Rock music inspired the first real (spiderless) cone tweeters. Having said that, most tweeters have more or less the same build / design, and from the information I have so far I have no reason to assume different manufacturers About diaphragms. 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