So it will be easy to compare. Dotten = broken ringing sound, Solid = clean sound. The first product being released by BlieSMa is a 34 mm tweeter, the T34A-4. IMPORTANT NOTE !!! Our official distributors in Europe are : M74 series 3” dome midrange lineup. BlieSMa, located in Blieskastel, Germany, was founded January 16, 2018 by Stas Malikov. Working backwards from that, you would need a 15" with about +/-6. 4dB/ 1m with low distortion crossed over @ 600hz with a 4th order. Moving mass of the driver is as low as 1. 0X04-NAB-02 looks to have an F3 of 65Hz and. The Bliesma drivers also incorporate variable thickness membranes which introduce differences too. 5" midrange and twin 12" Dayton RSS subwoofers; it's a back breaking, no holds barred assault on the state of art. Until Kartesian 75mm midrange is measured independently, 10F4424 remains objectively the best midrange in its class and format. New, only used for measurements. BlieSMa T25B Beryllium Tweeters. CONDITION: Used - on a scale of 1-10: 10. 1 - 9 of 9 Posts. BlieSMa. The first product released by BlieSMa is the T34A, a 34 mm tweeter. That is my experience as well. Amps: Biketronics BT4210 (210 x 4 mids/tweets), Biketronics BT3725 (250 x 2 midbasses, 700 x 1 sub). 00. Not very practical for the size constraints in an automobile. The Bliesma drivers are really well behaved and the mid is very consistent in radiation up to 1. I just didn't care for the bite of the Bliesma T34B. 1; 2; 3; First Prev 3 of 3 Go to page. I honestly believe these Bliesma drivers are top notch. 5W04 woofer, PTT6. As for the drivers vertical interference artefacts, you may calculate for the Bliesma combo lambda_2500Hz/95mm, and for the Purify combo lambda_2000Hz/121mm. Remarks : Internal thread M3 (fixing tweeter) and M4 (fixing support Comet) are to be carried out by the buyer. I want to hold on to that 200Hz crossover to keep the most important midrange band in one driver. SOLD SOLD SOLD SOLD SOLD SOLD. #1,707. 60* We ship this product to USA for free! Available from 27/11/2023 Packed in 2 pcs. I was delighted to see that BlieSMa is about to release it's new 3" dome midrange in 4, yes, 4 different flavors: paper, silk, Mg-Al, and of course Beryllium. 60 deg off axis response only matters for like a Dolby Atmos ceiling or sidewall speaker. Bliesma M74B-6 features large beryllium dome for low non-lineal distrotions. Displacement of the 15" at Xmax is 467cm3 whereas displacement of 4 x Purifi is higher at 532cm3. Scanspeak 6640,. BlieSMa T25S-6 Silk Dome Tweeter Matched Pair. I gave it a slight downward tilt too, adjusted by the two resistors. 4. 94db, 6ohm asking for $580. 12-19-2018, 06:59 AM. Subs: 2 x Scanspeak. 5M08-NFA-01A 6. The THD measurements at distance of 315 mm and voltage levels 2. #31. Saying I'm looking forward to that is an understatement. 34 mm. M74B-6 BLIESMA M74B-6, Beryllium 74mm Dome Midrange. Price is: $695. +1 for Bliesma. They have built their reputation extremely quickly for building tweeter designs that are at the forefront of driver design. , Scanspeak…? Apparently I can’t make things too easy on myself. Types and purpose of the measurements. Frequency Response. Frequency Response. This driver was loaned to me by Purifi for review. Underhung voice coil wound on titanium former. SS - 5,4g membrane weight. This is an unusual driver, but it has some serious lower midrange / upper bass capability. Blesma, The Limbless Veterans (formerly known as the British Limbless Ex-Servicemen's Association) is a British charity that helps all serving. €466. Bliesma T34B 2x Purifi PTT6. Scan Speak Classic 21W/8555-10 8" Woofer. Price: US $921. 5W04-01A + BlieSMa T25B-6 (in a waveguide) Pharaoh-Be version of Pharaoh loudspeakers using the BlieSMa T34B-4 beryllium membrane tweeters. OP . cone material. Features : • 25mm aluminium-magnesium alloy dome with variable thickness for ultrasonic first breakup mode • Extremely low moving mass for better transient response and higher efficiency • Fully saturated neodymium motor with copper sleeve for low. Of the bunch, it wins for cleanliness, accuracy and detail. The TSCT 1044’s frequency response is a gently rising slope and a smooth ±2. You might also be interested in: BlieSMa T25S. Brax Graphic Pro 6. So a quick question--say I wanted to use the BLieSMa midrange (silk or Be, not sure), could you offer an opinion about mating 15" woofer such as the Audio Elegance TD15H to a 3" mid--it seems like a radical transistion but probaly no more so than a 6. Miniature bookshelf speakers based on 4" Purifi PTT4. BlieSMa T25B-6, Xcelsus XXM325, Micro Precision 5. This Test Bench combines three new 25mm high-frequency transducers from German brand BlieSMa into a single characterization: the BlieSMa T25S-6 Silk Dome, the BlieSMa T25B-6 Beryllium Dome, and the BlieSMa T25D-6 Diamond Dome. Power Handling (RMS) 80 W. PTT8. disconnect. Support tweeter for tweeter Bliesma 68mm : T25A-6, T25S-6, T25B-6, T25D-6. The adjustable LPAD is intended for 8ohm drivers, so the setup is maybe a little unfair to the Bliesma. . 54. But I'm going to move to a different contour, I suspect fabric domes work better in OS contours. Thick aluminium powder coated flange. $281. For sale here is a pair of Bliesma T25B-6 Beryllium dome tweeters bought for a project a while back but never got round to using them. In February, 2018 we tested the first BlieSMa (Germany) product - aluminium-magnesium 34 mm dome tweeter T34A-4. There are small subtle differences between a good aluminum dome (SB26CDC) and a good beryllium dome (Satori TW29BNWG and. Flux density 2,2T vs 1,5T. Joined 2004. Mids: Satori MW13P-4 5" (Factory Door Locations). The speaker cabinet is a tower of 109 cm high, 45 cm wide and 50 cm deep. If anyone is wondering, the 74B is capable of 115. Very flat as well, with dome breakup at a very high frequency. Wire terminals are gold-plated. BlieSMa was. Thick aluminium mounting flange is powder coated, aluminium rear chamber is filled with. Here is the Hificompass test of the T34. SALE PENDING FS Bliesma T25A-6 Tweeters ONE MATCHED PAIR BNIB; ONE PAIR SOLD. That makes it a driver without parallel. 5" woofers in aperiodic door boxes, AE IB15, Joying Android HU. No ferrofluid for improved dynamics. The satori also has a low Fs and great response, price is similar. ). Our ergonomic designs easily adapt to a surgeon's technique and fully cover the expanding range of procedures that benefit from ultrasound guidance. Also, the Bliesma is mounted on top of the baffle, a bit far from the mid. Bliesma T25B. Bliesma T34 and Peerless DA32TX00-08 are the only ones I know of that may be able to. Front stage: 3 way Steg Masterstroke MSS 6 IB, MSS 3 and MSS 1. I listened to a variety of music, some on CD and some on YouTube. Bliesma dome range also has good values: "The confirmed low cutoff frequency for all models is 600 Hz with at least 2nd order filtering. We are a UK distributor for the highly acclaimed BlieSMa tweeters. Even at 107dBSpl it stays lower. 80*. Features : • 25mm silk dome and silk surround, each made from its own fabric for better sound quality • Extremely low moving mass for better transient response and higher efficiency • Fully saturated neodymium motor with copper sleeve for low non. 2 Volt were carried. Surface area isn't everything. 777 posts · Joined 2022. まだBlieSMaを鳴らして1日なのでちょっとかわいそうな比較ではありますが（とは言ってもインピーダンスカーブを見る限り、バーンインは完了してますが）、BlieSMaはScan speakと比較すると「 艶といった品位や音の芯は無い物の、脚色なくストイックに鳴る 」というのが最初に感じた印象です。Hi I have a build starting this week, a 2. Expected ETA is mid-February. MNCC (DSN 882. diyAudio. These look a curious beast maybe to bridge between a woofer/subwoofer and their M74 upper mid domes or with the aluminium possibly their T34 tweeters in a wave guide. 0 / 1000. The Bliesma 3" mid is totally comfortable crossing at 400hz, which very few dome mids can do (as it stands, I think that's ATC and Bliesma silk). Peerless. 20 shipping. Vinyl 299. Nice heavy aluminum housing. But I'm going to move to a different contour, I suspect fabric domes work better in OS contours. Please note that these values will have to be slightly adjusted according to real impedance data of each driver for the max performance. Wavecor TW030WA11 Fabric Dome tweeter. Notice the Focal tweeters (Silk Dome) have a higher price tag compared to the Beryllium, Focal near $600 while the BLIESMA T25B-6 is around $250-300. New in the box. 低音双12寸大音圈，动态很大，分析力超高，各类器乐，无论大小编制表现都可谓极致。. (3) Bliesma T25B-6. The matching level of Bliesma is awesome, particularly their tweeters. Choosing a Bliesma T25A tweeter with an outer chassis diameter of 68mm, you will get center-to-center distances of 95mm for the Bliesma combo, and of 122mm for the Purify combo. Product details. Features for this transducer include a small format 72 mm diameter injection-molded plastic faceplate, and an 8 mm wide coated. And it’s going to be my go to driver in high end immersive sound theatre installs. 83 - 8 Volt were carried out with High Pass Filter "on" (2nd order Butterworth type, 800 Hz cutoff, HPF2-800) The THD measurements at distance of 315 mm and. 3+8+15 layout iirc. 9K where it then begins to narrow. Nothing like power blips to cause LF to sneak into the output. Evolution of Pharaoh project, which has led to designing of new crossovers and going up. •••2015 GMC - BliesMa T25B pillars, Dynaudio e430 dash, dual Dayton 7" ES180-Tia woofers in aperiodic door boxes, underfloor sub box Alpine R 15", Stock HU ->NavTV->Helix Ultra, Brax, RF amps 2006 Chrysler 300c - BliesMa T25B pillars, Xcelsus XXM325 Dash, Satori 9. Some of the best known names in drivers are ScanSpeak, Seas, Morel, SB Acoustics, Audax, Accuton, and Eton. The tweeters i received were in factory packaging with one driver's rear chamber completely detached and rattling around. J. Bliesma T34B-4 tweeter. 3kHz. I recommend precision routing both sides (if you use MDF). 4 ohms. Without question, Bliesma produces fantastic products (I personally own the T25-6 tweet), but for car audio purposes, this large dome midrange doesn't make much sense. PuriWave (Purifi PTT6. The Bliesma T34 is better in every aspect, it is a good option at a lower price if you do not need high spl. 25X mid and small woofer drivers or you could jump to the new PTT8X aluminium woofer, the T74 would handle that As for 12” woofers really depends on how low you want it to go, whether you are going active or passive and whether you want sealed, passive radiator or vented. FI : BlieSMa - Speakers Capacitors Coils Equipment Car audio sets Accessories Amplifiers Resistors speaker, shop, buy, capacitor. Bliesma tweeter mated with a waveguide to optimize the off axis / power response integration with midwoofer. The only spec difference, except from the obvious from 16 vs 8 ohm. Just as legal as these are: DSP750 In-Wall Loudspeaker. Voice coil diameter. jpg. Single-layer ribbon voice coil of Bliesma M74B-6 is wound with copper-clad aluminum wire (CCAW) on titanium former. 6/12/2022 added routing templates and updated waveguides for use with these templates. BlieSMa T25S-6 Silk Dome Tweeter Matched Pair. There’s 4 different versions. My last attempt will be using a different chamber. FI : BlieSMa - Speakers Capacitors Coils Equipment Car audio sets Accessories Amplifiers Resistors speaker, shop, buy, capacitor. The new tweeter takes those base features and builds on them. 238. Sponsored. Hi Tihomir, what you see on the graph is actually wanted and exemplary effect of the WG. BLIESMA T25B-6, Beryllium 25mm Dome Tweeter. Scan Speaks 3" about 6-8V, TangBand also. 5 might better crossed earlier since AMT21CM has pretty wide dispersion at 3. The netto internal volume is 125 L and the woofer and lo. TLDR: the speaker uses a laser cut baffle to hold the tweeter/mid on the smallest denovo box. Lookswise the Bliesma is a nice match for Accuton drivers. Power Handling (RMS) W. 00 USD) per pair. Sensitivity. Here some more data (2x 3"! So 6dB louder as one). Xmax p-p 3mm vs 0,5mm. 13 December 2019, 12:16 Friday. Build quality is superb. Single-layer ribbon CCAW (Copper-clad Aluminum Wire) voice coil of Bliesma M74A-6 is wound on titanium former. 5" woofers in aperiodic door boxes, AE IB15, Joying Android HU. Bliesma M74P-6 midranges feature 74 mm natural silk soft dome with integrated surround and protection grill. From my own experiences with 12MU, DXT, Bliesma, 4inch WG etc. 5" woofers in aperiodic door boxes, AE IB15, Joying Android HU. In the HifiCompass review of the Bliesma 3" aluminum and beryllium domes it stated that "At frequencies of 2. (+380) 95 904 7827. From Eton I received the 29HD2, its neodymium motor tweeter, with a fairly rich feature set that includes an aluminum faceplate, a 28 mm diameter magnesium diaphragm with a ceramic coating on both sides protected by a cosmetically attractive grill/phase plug, and driven by an aluminum former. Ogive support tweeter for tweeter Bliesma 68mm : T25A-6, T25S-6, T25B-6, T25D-6. The 25-2234SD is a compact tweeter that features a 1” aluminum/magnesium inverted dome, a neodymium motor structure, an injection-molded faceplate, a protective grill, and. 6 ohms. Save Share. You have to compare THESE THD ratings or measure the Biesma at 1-1,5V. 2 Volt were carried out with High Pass Filter "on" (2nd order Butterworth type, 800 Hz cutoff, HPF2-800) . What one needs is to match +/- 0. Revealed. 2018-12-31 6:03 pm. Reactions: dualazmak. later they gave up this concept for more upper bandwith (underhung coil) the coil was made of flat edgewound CCAWire on kapton former. Blissoma creates organic, holistic, whole plant skincare that solves skin problems. FI: BlieSMa T34B - High-sensitivity tweeter with 34-mm beryllium alloy dome. MNCC (DSN 882. 71/ea. Tweeter is BlieSMa T25B crossed at 2750hz LR4 passiv. 28 each one Buy 3 $884. I think I've finally nailed the throat for the Scanspeak ring radiator, so I'll be expanding to other sizes and shapes now. 95db, 6ohm. 00 Canadian Dollars (around $530. T34B + WG: - at 2kHz 0-60deg SPL difference is -4dB. This is important to consider. Wishlist Compare CA$563. Scan Speaks 3" about 6-8V, TangBand also. It is possible that 500 Hz will be quite normal if you reduce the requirements for maximum SPL. Single-layer ribbon CCAW (Copper-clad Aluminum Wire) voice coil of Bliesma M74A-6 is wound on titanium former. To begin, I used the LinearX LMS analyzer to produce the 300-point impedance sweep. Dayton audio OmniMic V2 Precision Measurement System. . Product description. eu BlieSMa M74A-6, M74B-6, M74P-6 and M74S-6 What is on the test bench? In the end of 2021, the pleased the loudspeaker designers community with the release of a line of four 3" dome midranges at once, the development of which had been rumored for a long time. Notice the Focal tweeters (Silk Dome) have a higher price tag compared to the Beryllium, Focal near $600 while the BLIESMA T25B-6 is around $250-300. Single-layer ribbon voice coil of Bliesma M74B-6 is wound with copper-clad aluminum wire (CCAW) on titanium former. (and BlieSMa T34B-4 tweeter,SB Acoustics SB17NBAC35-4 mid) Had a few delays. So a Bliesma T25B-6 + SBA TX midrange/woofers is hopefully in the future for me. I'm thinking really hard about switching the tweeter out for the raal 70 20 sr Bliesma T25B-6, SB MD60, Purifi 6. 5M08 and crossed over at 2500Hz to the (probably) Bliesma T34A. 0 g) of moving part, with linear excursion of 2. The harmonic distortion of this transducer is low, better than -55 dB between 2200 and 8000 Hz at 2. . The ETON has a 28mm magnesium/ceramic dome. HTPCs, Computers, Remote Controls, and other Electronic Devices. I have no reason to use the T34B (which I'm using now) the T25 is much better for this concept. Attachments. Info sheets on the new Bliesma 3" domes has been released on Vegalab and Hificompas posted on Diyaudio, four variants - Silk, Aluminium, Paper and Beryllium. Wavecor SW223, check. , Scanspeak…? Apparently I can’t make things too easy on myself. After 3. Available from May 2018, the T34A-4 is a 30 mm metal aluminum/magnesium alloy dome tweeter with a substantial feature set that includes extremely low moving mass, and a fully saturated neodymium motor with copper. . JBL 580 vs Bliesma/ETON vs Yamaha (the Yamaha cuts out by 3khz so judge between 500hz and 3khz) The levels were not matched. SFB-1000D, SI SPL-12 subwoofer sealed. 5M08 and crossed over at 2500Hz to the (probably) Bliesma T34A. They've got an option (which costs truckloads. Saying I'm looking forward to that is an understatement. You can add up to three drivers for comparing. It is very good. This Test Bench combines three new 25mm high-frequency transducers from German brand BlieSMa into a single characterization: the BlieSMa T25S-6 Silk Dome, the BlieSMa T25B-6 Beryllium Dome, and the BlieSMa T25D-6 Diamond Dome. Looks interesting, no idea on price range but a question has been asked on Vegalab so eagerly awaiting response. 3, Vas = 25 liter. I thought this was a really neat writeup about some high-end tweeters. The Scanspeak dome is a bit tougher nut to crack. Mar 16, 2023. 5" true midrange. (BlieSMa t25b + ETON 3-212 + Seas l26roy) + Hypex + PE boxes. Neither is my personal communication with them or Bliesma. 2 dB from 1. For me, the most interesting part was how silk. $ 273. I just can't get a break with this bad luck. Straight baffle also provides good results, but to achieve good phase tracking LR2 is not possible and you will need to implement ~LR4. You will find them recommended by some of the most respected names on this forum. Wavecor WF120BD03 midwoofer. 5" mids (for sale with all outboard crossovers) SI BM MKV (I will be listing 2 for sale) These tweeters paired incredibly well with the ultra-detailed and dynamic Brax mids, and they would make a good match with many other mids. That tweeter's dispersion performance is so nice, but the other parameters are purely mediocre compared to that purifi woofer. 3khz, 1khz, 80hz which are fully changeable by directivity and other considerations. As a whole, when used in their pistonic range within VC excursion limits, HF drivers shouldn't exhibit too much of their own signature. 33 Each. Sd = 180 cm^2, that is more surface area than a 7" woofer, and almost as much as an 8" woofer. This is the second high-end 29 mm beryllium diaphragm neodymium dome sent by SB Acoustics for Test Bench. 5kHz and 2. This article was published in Voice Coil, March 2019. Something like the Bliesma T34B has much better performance regarding THD and control of resonances (though also in a different price category). It is not intended to be a deep dive. 伊顿 5-312+ 魔雷高音 / 艾卡顿陶瓷高音 / 伊顿或蒙多福气动式高音 / 绅士宝或 BlieSMa 铍高音. The 753 is slightly lower in price, and under some conditions might allow a little closer spacing of drivers. Curved. Unit price. So, 250-1K for the M142, 1-4K for the M74, 4K up for the T25. Single-layer ribbon CCAW (Copper-clad Aluminum Wire) voice coil of Bliesma M74A-6 is wound on titanium former. Available since May 2018, the T34A is a metal aluminum. 2015 GMC - BliesMa T25B pillars, Dynaudio e430 dash, dual Dayton 7" ES180-Tia woofers in aperiodic door boxes, underfloor sub box Alpine R 15", Stock HU ->NavTV->Helix Ultra, Brax, RF amps 2006 Chrysler 300c - BliesMa T25B pillars, Xcelsus XXM325 Dash, Satori 9. So in baffle I expect ~-5dB. 1300 - 35000 Hz. Prior to starting BlieSMa, Malikov worked at Ultrasound Technologies, at Morel as a QC manager and a transducer engineer, and at Accuton as a production engineer for the last 8 years. The review on this website is a brief overview and summary of the objective performance of this speaker. 91 + $30. 83 - 11. BlieSMa T25A-6 25mm Aluminum dome tweeter 6 Ohm The measurements of a pre-production sample of the BlieSMa T25A-6 tweeter. I'm not sure whether it will be Bliesma or Purifi. First plot is the 6" vD from a couple posts above and the ABEC model of that waveguide. Flexible and lightweight lead wires made in Denmark. IIRC the H series of woofers are the "subbiest" of the bunch. This Textreme cone 6. Bliesma T34B-4 - information in PDF format (204 Kb) Manufactured by: BlieSMa ♦ Model: T34B-4 ♦ Origin: Germany ♦ Shipping Weight: 0. 0X04-NAB-02. The Bliesma T34 is better in every aspect, it is a good option at a lower price if you do not need high spl. The T34s can play at levels that very few dome tweeters are capable of while sounding good, the distortion down low beats all the competitors too. Bliesma 1,8g Interestingly the Bliesma seem to beam stronger! Didn't expect that. 5W04-01. #1. The detail is in the mid-range, and the three-way MUM-8 features a domed tweeter and midrange driver for uncompromising detail and a superb off-axis response for a wide sweet spot. Figure 3 depicts the TSCT 1044’s on- and off-axis response. . Facebook/HiFiCompass. antennaguru said: I stopped using midrange drivers a long time ago because the lower crossover point from the woofer to the midrange driver was in too critical a frequency range within the audio band, and was always too easy for me and others to hear as a discontinuity, and find distracting. Purifi also launched an 8" which looks rather decent. Then I modeled another 6" using an OS profile. 5寸口径上，石墨烯单元还有几个有力的竞争对手， 但在5. 5” or 8” woofer. BlieSMa was founded January 16, 2018, by Stas Malikov. Features : • Flush mounted surround and rear mounted magnet system from its own fabric for better sound quality for flat frequency response and wide off-axis response Test Bench: The T34A-4 Tweeter from BlieSMA. Wavecor TW030WA13 tweeter. $281. Been out for a decade+, but has a distortion profile that can compete with a Bliesma >3kHz, slightly higher H2 (~-45dB) but stupendously low (-70dB broadband) H3 and above. Natural silk soft dome midrange. Reactions: hoodlum. The iPhone 13 Pro will start from $999 for the lowest-capacity model, while the iPhone 13 Pro Max starts from $1,099. Expected ETA is mid-February. Army Family of Medium Tactical Vehicles (FMTV) M1140 truck frame. The other one had its chamber loose, ready to fall. This will allow for the Atmos standard of 105dB at the listening position up to 4m from the front mains. 8 g. I used 2xSB17NBAC on the bottom of 3-way and it was good for the price, though it was little bit one-note bass. I had to buy all of the gold "Female Disconnect" sizes since none of my drivers are the same. Highlights. SB17xxxx - very nice measurements and value, especially NBAC models. This will yield very nice horizontal off axis responses and most probably no dip in power response at Fc when vertical measurements are included. I bought the little 22TAF. I've seen a fair amount of discussion of putting a Bliesma T25B in a DIY fabricated waveguide, but I haven't seen anything where someone tried it with the Visaton WG148 or the Monacor WG300 or another commercially available waveguide. Full range loudspeaker. . $125 (2) Dayton AMT2-4. 5", and Hypex FA123 What does everyone think?2015 GMC - BliesMa T25B pillars, Dynaudio e430 dash, dual Dayton 7" ES180-Tia woofers in aperiodic door boxes, underfloor sub box Alpine R 15", Stock HU ->NavTV->Helix Ultra, Brax, RF amps 2006 Chrysler 300c - BliesMa T25B pillars, Xcelsus XXM325 Dash, Satori 9. 31 (excl. And he’s making both a passive version for luddites, and an active version for music lovers. From datasheet, 18WE has that difference -4dB. 16 - driven with 3x Sony XES M3 Eminence LAB 15 - driven with Alpine PDX M12, Helix DSP Pro MKII + Director + Fiio X7 mk2. I tried to do a gentle slope. 97db, 6ohm. I had to buy all of the gold "Female Disconnect" sizes since none of my drivers are the same. But still, in the range around 2kHz, ScanSpeak is the clear winner (<50dB/0. Moving mass of the driver is as low as 1. 2200 - 35000 Hz. Stinger Heigh10, optical to MiniDSP C-DSP 8x12 DL, Soundstream PN4. •••This is a subjective, qualitative, sighted evaluation and comparison of a prototype pair of March Audio Sointuva loudspeakers with Purifi woofers and Bliesma tweeters. The Purify has >10dB less sensitivity and 3-4x the moving mass (the mid version, the x version is even more extreme). 80 €356. Hi Diyma, Selling a pair of Bliesma T25B-6 Beryllium tweeters.