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Tymphany BC25TG15-04 1" Silk Dome Tweeter
2nd Order Cross Over Frequency
I would recommend crossing this tweeter at 2,800 Hz or higher using a second order filter.
Date published: 2015-01-20
what are the mounting hole dimensions on this tweeter
The mounting holes on this tweeter are on a 92mm (3.62") circle and are 4.2mm (0.165") in diameter.
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.
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.
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.
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.
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.
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.
Date published: 2013-06-04
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?
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)
Date published: 2013-08-30