![]() ![]() Figure 6 shows the two-sample SPL comparison, indicating the two samples were closely matched to within 1.25dB or less throughout most of its operating range.Īfter finalizing the impedance testing, I recess mounted the T25B-6 Beryllium dome tweeter in an enclosure that had a baffle area of 12” × 6” then measured the DUT again using the LoudSoft FINE R+D 192kHz analyzer and the GRAS 46BE microphone both on- and off-axis from 200Hz to 40kHz at 2.0V/0.5m normalized to 2.83V/1m using the cosine windowed FFT method. And, the CLIO 180° polar plot (measured in 10° increments) is shown in Figure 5. The off-axis curves normalized to the on-axis response are shown in Figure 4. Figure 3 gives the on- and off-axis response of the T25S-6 high frequency device. All of these SPL measurements also included a 1/6 octave smoothing.įigure 2 shows the T25S-6 on-axis response to be a flat ☒.75dB from 1kHz to 35kHz with zero diaphragm break-up modes. Then I measured the device under test (DUT) using the LoudSoft FINE R+D 192kHz analyzer and the GRAS 46BE microphone (courtesy of LoudSoft and GRAS Sound & Vibration) both on- and off-axis from 200Hz to 40kHz at 2.0V/0.5m, normalized to 2.83V/1m (one of the really outstanding tricks FINE R+D can do), using the cosine windowed FFT method. With a 5.24Ω DCR (Re) (factory spec is 5.2Ω), with the minimum impedance for this tweeter measuring 5.47Ω at 5.28kHz.Īfter completing the impedance testing, I recess mounted the T25S-6 tweeter in an enclosure that had a baffle area of 12” × 6”. The T25S impedance resonance occurs at a moderately low 894.5Hz (factory spec is 940Hz). I began testing the T25S-6 silk dome version (Photo 1), using the LinearX LMS analyzer to produce the 300-point impedance sweep illustrated in Figure 1. Underhung voice coil with a Titanium formerįlexible and lightweight tinsel leads from DenmarkĪluminum rear chamber with wool damping materialĮxtremely wide frequency range 2.2kHz to 22kHz (silk), 2.2kHz to 40kHz (Beryllium and diamond) Narrow surround for less “soft dome” colorationįlush-mounted surround and a rear-mounted magnet system for flat frequency response and wide off-axis response In terms of features, all three share pretty much the same feature set:Ģ5mm dome diaphragm - both the Beryllium and Diamond domes have a first break-up mode in the ultrasonic rangeĮxtremely low moving mass - Mms=0.16g (silk), 0.10g (Beryllium), and 0.15g (diamond)-for better transient response and higher outputįully saturated neodymium motor with a copper sleeve shorting ring for low nonlinear and modulation distortionĢmm linear excursion and a large pole vent for low distortion low-frequency operation Photo 1: BlieSMa T25S-6 silk dome transducer These will be explicated in that order, starting with the T25S silk dome model. The versions being tested this month are the T25S silk dome, the T25B Beryllium dome, and the T25D diamond dome tweeter. All three tweeters appear to be built on the same platform, but optimized for each diaphragm material. ![]() Three of the four are being featured in this month’s Test Bench article. For the last 3.5 years BlieSMa has been producing some very high-quality OEM high-frequency transducers and has now introduced four more 25mm domes to its catalog. Over the last 20 years, Malikov has worked at Ultrasound Technologies at industry legend Morel as a QC manager and a transducer engineer and at Accuton, the very well-known high-end driver OEM, as a production engineer for more than 8 years. BlieSMa, which is located in Blieskastel, Germany, was founded Januby Stanislav Malikov. Installed per: /2010/04/iboot-multibeast-install-.Īudio fixed by installing the pair of KEXT's here: USB/iPhone sync issue fixed by upgrading motherboard BIOS: Bench has previously featured two 34mm dome tweeters from BlieSMa: the T34A aluminum-magnesium alloy dome tweeter in the June 2018 issue of Voice Coil, and the T34B Beryllium Dome tweeter in the March 2019 issue of Voice Coil. HDD: Western Digital Caviar Black WD1002FAEX 1TB Video Card: EVGA 01G-P3-N959-TR GeForce 9500 GT 1GB ![]() Memory: G.SKILL 4GB (2 x 2GB) DDR3 SDRAM F3-12800CL9D-4GBNQ Parts list (the hard drive has been upgraded since this list was assembled): /WishList/PublicWishDetail.aspx?WishList. It "feels snappier," but that's not a terribly useful measure either. In any case, the system achieved an Xbench score 239.37, which is pretty good. Since I was too stupid to figure out how to setup the booting stuff after cloning my old drive, I just ended up reinstalling and using the migration assistant to move my old profile onto the freshly installed system. I ran out of space on my old 500 GB HDD and upgraded to a 1 TB. ![]()
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