HiVi RT2C-A Planar Isodynamic Tweeter

Brand:|Model: RT2C-A
• Planar • Power handling: 30 watts RMS/60 watts max • Nominal impedance: 8 ohms • DC resistance: 7 ohms • Frequency range: 1,700-25,000 Hz • SPL: 94 dB 1W/1m
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Part # 297-406
  • Near weightless diaphragm results in exceptional transient response
  • Extremely flat frequency response from 2,000 to over 20,000 Hz
  • Remarkably linear impedance and phase simplifies crossover design
  • Reproduces the tiniest details with extreme clarity and transparency

Product Details

HiVi RT2C-A Planar Isodynamic Tweeter

Why Isodynamic? Contrary to a conventional dynamic driver, these transducers have a driving force distributed evenly over the whole area of their vibrating elements. The key feature of the RT2C-A is the membrane, which consists of Kapton film with a pattern of aluminum conductors. The conductors cover about 90% of the whole vibrating area. The membrane assembly is placed precisely between two rows of Neodymium and Barium Ferrite bar magnets. A larger membrane area provides higher power handling and substantially extended low-end cut-off frequency. The aluminum mounting flange, with flared waveguide, controls the frequency response and directivity of the tweeter. This tweeter is magnetically shielded and is extremely flat with a depth only 27 mm including the mounting flange.

The RT2C-A has resistive impedance in the audio frequency range. This unique feature provides a friendly load for any amplifier and facilitates easy crossover design. Unlike other drivers, it has an essentially linear phase response that provides time coherent reproduction resulting in accurate musical rhythm and imaging. The vibrating elements are almost weightless compared to that of a dome tweeter. As a result, it provides an immediate and precise response to any transients in the original signal. The RT2C-A has the exceptional ability to reveal the dynamics of instruments with complex high frequency spectra. Unlike conventional tweeters and electrostatic speakers, this tweeter has an extremely wide sound dispersion in the horizontal plane. At the same time, contrary to other dynamic tweeters, it also has well-controlled dispersion in the vertical plane. This feature helps to avoid disturbing floor and ceiling reflections, increasing imaging accuracy. There is no need to manipulate the network or use multiple units to achieve the restricted vertical directivity necessary for home theatre applications.

When considering all of the properties of the RT2C-A, it becomes clear why many critical listeners among audiophiles highly prize planar transducers for their unsurpassed clarity, transparency and the ability to deliver every tiniest musical detail. Since these isodynamic tweeters have the exceptional ability to reveal the dynamics of instruments and sonic resolution, it is recommended to match it with drivers having similar properties in order to maximize the overall integrity of a speaker system.

The clamped membrane of the RT2C-A is connected to the more massive round front metal plate. This, combined with a special heat conductive compound, provides effective cooling of the aluminum conductors, dramatically increasing its dynamic range. Recommended crossover frequency is >1,700 Hz.

Product Specifications
  • Tweeter TypePlanar
  • Impedance8 ohms
  • Power Handling (RMS)30 Watts
  • Frequency Response1,700 to 25,000 Hz
  • Sensitivity94 dB 1W/1m
Thiele-Small Parameters
  • DC Resistance (Re)7 ohms
Mounting Information
  • Overall Outside Diameter7"
  • Cutout Diameter6.19"
  • Depth0.75"
HiVi RT2C-A Planar Isodynamic Tweeter
  • BrandHiVi
  • ModelRT2C-A
  • Part Number297-406
  • UPC844632021732
  • Product CategoryTweeters
  • Unit of MeasureEA
  • Product Rating
    (6 Reviews)
  • Weight1 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

View similar products to the HiVi RT2C-A Planar Isodynamic Tweeter
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HiVi RT2C-A Planar Isodynamic Tweeter
HiVi RT2C-A Planar Isodynamic Tweeter is rated 4.8333 out of 5 by 6.
Rated 5 out of 5 by from great sound on acoustical musicI put one in a larger center channel ,I crossed it over at 2K at 18 db per octive using audyn met.prop.caps and an 18 gauge coil , also as stated above I used a var.L pad.The sound is REAL ,guitar string plucks on recordings that Inever used to hear are there as big as life . I used it with 4 - M5N's and it matches up well.The enclosure is 1.2 cu. Ft. Tuned to 50 htz.+/-2 htz. Minimally damped .Using 1 inch MDF for the baffle 3/4" for the rest . Rock paint on the front and satin on the back.The M6N enclosures on the sides will eventually match the center.To put it plainly very clear , very transparent.
Date published: 2014-06-19
Rated 5 out of 5 by from Crisp, Sharp SoundThese tweeters are absolutely amazing. I recently built a pair of three way speaker, and these are the show piece. Not only do they look great in the cabinet, they sound incredible. I haven't taken them to 100% yet, but at 75% they had no mud or rattle to them. They are easily worth the price. I've already decided if I do another build I'll be using these tweeters again.
Date published: 2012-06-11
Rated 4 out of 5 by from Excellent tweeter, but difficult to implement optimally.The planar magnetic design is well-suited for tweeters, but it naturally comes with its own set of tradeoffs that makes it challenging to properly implement into a high-performance two-way system.Planar magnetic tweeters have a reputation for offering very detailed highs without harshness, and this is true of the RT2 series. Metal domes can offer great detail, but manylisteners, myself included, find metal dome tweeters to sound harsh. The RT2 provides great detail without the harshness of a metal dome.This is a very large tweeter which increases its power handling and efficiency, but this comes at the cost of extremely limited vertical dispersion, making it difficult to get balanced sound, except within a very narrow listening window. This requires a very carefully arranged listening set-up for optimum performance. I found it necessary to use an L-Pad to adjust tweeter level for different listening positions.The tweeter is rated for 1,700 HZ on the low end, but I recommend crossing it over at no less that 2,500 HZ @ 18dB/octave to avoid overdriving it.The large faceplate makes mounting it a challenge, and despite its large size, it has a very small contact area at the top and bottom, leaving no margin for error when making the cut-out into the enclosure. Its round faceplate and retangular backside also make it difficult to properly inset into the enclosure for a flush fit; I found it required not only a router, but a chisel set and a lot of patience.Overall this tweeter offers excellent performance, but the user should be mindful of the challenges it presents.
Date published: 2011-12-30
Rated 5 out of 5 by from clean and powerfulThese things sound great and really have a-lot of output (high sensitivity and real world power handling)I am currently using the RT2H-A in a DJ system, and planning to do the same with this one. It goes reasonably well with an Eminence alpha or beta-8aThese tweeters are sensitive and loud, so expect to pan them down with anything other than a high sensitivity midrange. A musician friend of mine stopped by last weekend, and was rather impressed to hear this tweeter matched with a pro sound 8" midbass and simple 1st order crossover.
Date published: 2010-03-10
Rated 5 out of 5 by from Used in Wayne J's VeritasPlease see my review of the Dayton Classic 10, and the Dayton 2" Dome Midrange.Again, my thanks to Wayne J for making this design available.I did a lot of reading on tweeters before deciding to run with Wayne's design as presented, and am very glad I used this driver.As advertised, these have a high sensitivity rating, which means they keep up with the Dayton Dome Midrange and the 2 Dayton 10" Classic woofers in this design.On some recordings they can sound overly "bright", or as some have used the term, they sizzle, for the most part I have noticed this on female vocals. This only seems to be on source material that is mixed for low end reproduction equipment. This is a very low percentage of my music so it is not a problem for me.For the music I listen to regularly, Acoustic, Classical, and Contemporary Christian, these are amazing...Cymbals are within your reach, Triangles are almost visible, you can feel the vibrations of the strings, and Snare drums come alive. On some recordings if I close my eyes I feel I can touch the musiciansSuffice it to say, I am very pleased with these units and highly recommend them, and Wayne s Design!
Date published: 2010-02-03
Rated 5 out of 5 by from Must I say yuo that this is perfekt?This Speaker is the best i never heart.And when i leaf in in your beautiful LAND i buy it for all my speakers.You mast know i pay for it in my COANTRY MORE THAN 400 $.And please take the crosover at 2000 Hz.(8.2 uf 0,82 mh 33uf 18db octave) its fantastic.
Date published: 2007-06-06
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Product Q&A

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who own this product or have experience with it.
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HiVi RT2C-A Planar Isodynamic Tweeter

Can the back be removed for dipole use? (There's no photo of the back on PE's site, nor in the spec sheet from hi-vi)

Asked by: emaxon
The back cannot be removed from this tweeter.
Answered by: MattP
Date published: 2015-01-05

Im building a pair of 2-way loudspeakers for my home studio setup, could i pair these with a 12" midrange woofer, if so, what would u recommend?

im willing to spend up to $250. im also looking to build a crossover! maybe get one thats close, and just upgrade a couple components to get a really good Xover!
Asked by: Mixamill
In regard to using the RT2C-A with a 12" driver:--I cannot recommend using the TR2C-A with a 12" driver, and (excepting a couple of specifically designed wide-range drivers) I cannot recommend using ANY 12" driver in a 2-way system with any tweeter.--The off axis beaming begins at 1130 Hz with a 12" driver, so in-room power response and balance goes out the window. Also in contrast to the OEM recommended cut-off of >1700 Hz for this driver, in my extensive use of this driver, I find that 2500 Hz is a more appropriate lower limit, placing its cut-off well out of reach of a 12" driver.--In general, planar magnetic drivers are a challenge to integrate properly with cone drivers; the driver designs and tone (sonic signatures) are really quite different, and the combination sounds unconvincing to my ears. However, I have had good results using smallish drivers in the 5" range.In regard to modifying an existing crossover to match a given combination of drivers, this is possible, but again I cannot recommend this as a practice. Crossover design is a complex art and science, and while it can be a very rewarding hobby, effectively designing, measuring and implementing a optimum crossover requires a level of expense, equipment, experience and time commitment beyond the scope of all but the most dedicated home designers.I recommend trying the UA701 Usher Kit speaker systems offered by PE for your home studio.Cheers,
Answered by: PlatoIndy
Date published: 2012-12-28
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