Tymphany BC25TG15-04 1" Silk Dome Tweeter

Brand:| Model: BC25TG15-04
The BC25SG15-04 1" dome tweeter from Tymphany (formerly Vifa) can meet the most demanding requirements for audio excellence.
  • Sculpted, recessed-loaded round 4-hole faceplate
  • Smooth, extended response and high efficiency
  • 1" textile dome
  • Ferrofluid cooled voice coil
Part # 
Weight: 1.2 lbs.  
List Price$24.99
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Buy 4-up$15.99
Part # 264-1040
Qty:  EA
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Product Details

Tymphany BC25TG15-04 1" Silk Dome Tweeter

Designed by Tymphany's experienced team of engineers, the BC25TG15-04 1" dome tweeter can meet the most demanding requirements for audio excellence. The tweeter features a textile diaphragm, high-energy ceramic ferrite magnet, and sculpted plastic faceplate. Ferrofluid in the magnetic gap improves driver cooling.

Product Specifications
  • Tweeter TypeSoft Dome
  • Cone / Dome Diameter1"
  • Impedance4 ohms
  • Power Handling (RMS)50 Watts
  • Frequency Response1,130 to 20,000 Hz
  • Sensitivity94 dB 1W/1m
Thiele-Small Parameters
  • Resonant Frequency (Fs)1,130 Hz
  • DC Resistance (Re)3.10 ohms
  • Mechanical Q (Qms)1.59
  • Electromagnetic Q (Qes)1.06
  • Total Q (Qts)0.64
Mounting Information
  • Overall Outside Diameter4.13"
  • Cutout Diameter3.00"
  • Depth1.25"
Tymphany BC25TG15-04 1" Silk Dome Tweeter
  • BrandTymphany
  • ModelBC25TG15-04
  • Part Number264-1040
  • UPC844632083815
  • Product CategoryTweeters
  • Unit of MeasureEA
  • Product Rating
    (13 Reviews)
  • Weight1.2 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.

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Tymphany BC25TG15-04 1" Silk Dome Tweeter
Tymphany BC25TG15-04 1" Silk Dome Tweeter is rated 4.7692 out of 5 by 13.
Rated 5 out of 5 by from greatYes, I get four tweteer, in the begining i was thinking that may be is no good , but when i istall in my equipment i was surprise , this tweeter is from good quality. about the service was fast also I recommended this company. sorry for my english i am spanish and sometime is hard for me to write english.
Date published: 2015-04-30
Rated 5 out of 5 by from Excellent Valuefor some reason my previous review last year of this tweeter was deleted. any way, i can't recommend this tweeter enough! one would have to spend a lot more to get this sound quality. i replaced Vifa aluminum domes with these and the difference is substantial. very smooth with decent extension and low distortion. dispersion is surprisingly wide except for the very top of it's range. since my 60 yr old hearing doesn't extend up that high it doesn't matter. there is a nice detail to the sound which one does not expect at this price. i am thinking of buying another pair for some small JBL bookshelf speakers i have had for years. i would recommend crossing over above 2800 hz with at least a 2nd order. my current speakers cross at 3000 3rd order in an MTM..
Date published: 2015-04-28
Rated 4 out of 5 by from Very good soundI bought these this month to replace my Audax tweeters that were shot. I had to add a 4 ohm resistance in series as the woofers and the crossovers are 8 ohms. I tried them at first without the 4 ohm resistance, but they were a bit too bright especially on the string tone on classical music.Very happy as they have given new life to my old and trusty Spendor Preludes.
Date published: 2015-03-16
Rated 5 out of 5 by from Excellent tweeter for the money.I had some old EPI 100 cabinets with blown drivers. These tweeters fit perfect and sounded better than I remember the originals sounding. I can't imagine a more expensive tweeter sounding any better.
Date published: 2015-01-11
Rated 5 out of 5 by from Good ValueGreat upgrade for any three-way speaker system. I used these in a Technics system from the 90's without crossover modification and they were much smoother and extended the HF response. Imaging was far superior than the original tweets.
Date published: 2014-12-05
Rated 5 out of 5 by from Excellent purchasePerforms to specs and fitted right in. Good quality, fair pricing and efficient shipping.
Date published: 2014-10-01
  • 2015-05-29T07:13CST
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Product Q&A

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Tymphany BC25TG15-04 1" Silk Dome Tweeter

2nd Order Cross Over Frequency

Asked by: Auburn 77 81
I would recommend crossing this tweeter at 2,800 Hz or higher using a second order filter.
Answered by: MattP
Date published: 2015-01-20

what are the mounting hole dimensions on this tweeter

Asked by: atticghost
The mounting holes on this tweeter are on a 92mm (3.62") circle and are 4.2mm (0.165") in diameter.
Answered by: MattP
Date published: 2014-08-11

Can I connect this 4 ohm tweeter to a 8 ohm x-over with an 8 ohm woofer, and will the regular impedance be 8 ohms? I thought it would only raise the x-over point.

Asked by: leonveek
It will change the crossover point. The hardest load on the amp will still be 8 ohms but the higher frequencies will dip down to 4. This is generally not an issue since there is very little current draw at those frequencies.
Answered by: MattP
Date published: 2015-03-02

I am looking at combining this in a 2-way speaker with the Celestion Neodymium 5" Full-Range Woofer 4 Ohm, what would be a good crossover point for these? My original thought was ~ 6000, but I am new to this and want to make sure.

Asked by: AMMS
This combination will work with anything between 3-6kHz to be honest. I would probably shoot for a lower crossover since the Celestion has a bit of a break up around 7kHz.
Answered by: MattP
Date published: 2014-03-04

Replacement for Bose 301's Series II?

There are two tweeters in each speaker and I am assuming that they are 4 ohms each? Not sure how they are crossed over, there is not much of a crossover to speak of in the cabs but since these are rated down around 1130 Hz, they may make a good replacement. I also changed the woofers out to the Dayton Classic which made a big difference with much better lows that are not muddy like they were.
Asked by: CurtZ
There is a good chance the original tweeters were rated for 4 ohms however we have no way of knowing this for sure. Generally cone type tweeters like the originals are crossed around 3-5kHz which would be safe for this tweeter as long as it is second order. I would recommend a high pass filter for added protection.
Answered by: MattP
Date published: 2013-06-04

impedance compensation?

Is a 4 ohm resistor wired in series with this 4 ohm tweeter appropriate for use in an 8 ohm, two-way system? Does the resistor reduce the SPL from 94 dB to 90?
Asked by: Johnny Reno
Yes, you can use a 4 ohm resistor rated 10W in series with this tweeter to establish a net ~8 ohm load. Efficiency will drop by ~3dB as 50% of the energy delivered to the series load will turn to heat in the resistor.Keep in mind that your crossover will also be acting on the 8 ohm load of both devices in series - not just on the 4 ohm tweeter - so build for that.Also be aware that impedance increases somewhat above 9khz on this driver, so if you find output unpredictable above that you can install a 2.2 microfarad cap & 10 ohm resistor (series) in parallel with the tweeter-4 ohm resistor series. This should keep impedance fairly uniform. (google "zobel" for clarification)
Answered by: edegaston
Date published: 2013-08-30
  • 2015-05-29T09:36CST
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