Audiofrog GB10CF
Audiophile Grade
Carbon Fiber Tweeter

Audiofrog’s new proprietary carbon fiber dome and acoustic lens provide performance unmatched by other 1” tweeters. GB10CF’s performance is so good, it rivals even high-end AMTs and comes in a smaller and easier-to-install footprint.

About

Audiofrog’s new GB10CF tweeter includes everything great about the original GB10—neodymium magnet, shorting ring, anti-reflection pad under the dome, chrome plated cast nickel housing and all the installation accessories needed to flush or custom mount the tweeter. The GB10CF features  a thin film carbon fiber dome and an acoustic lens. What’s the big deal? Nearly ruler flat frequency response from 2kHz to 20kHz and distortion below 0.6% over the useable range provide unmatched detail and clarity. Best of all, GB10CF can be crossed at 2kHz with a 24dB/octave Linkwitz Riley filter, which makes it a stellar performer even in a 2-way system with a GB60.

Flat
Frequency
Response

With frequency response within +/- 1.5dB measured on axis and within +/- 1dB measured at 15 degrees, GB10CF can be used with 2kHz 24dB/oct Linkwitz Riley high pass filter.

Ultra
Low
Distortion

With THD below 0.6% from 2kHz to 20kHz, GB10CF unmasks all the high frequency detail in your favorite recordings.

World
Class
Engineering

Like the original GB10, GB10CF includes a neodymium magnet with a copper shorting ring to reduce inductance and extend the high frequency response. A hemispheric foam pad under the dome absorbs reflections from rear-going sound waves so they don’t create frequency response aberrations in front of the tweeter.

Additionally, GB10CF includes an acoustic lens and waveguide designed specifically to optimize the relationship between on and off axis sound.

How do the lens and waveguide work?

At frequencies with wavelengths significantly longer than the diameter of the tweeter’s dome, the sound is radiated in all directions; forward and to the sides. At these frequencies, the small shapes and edges that surround the tweeter’s dome are too small to act as reflecting surfaces. As frequency increases, the soundwaves become shorter and shorter.

Eliminating
Peaks And
Dips

At higher frequencies, the dispersion of sound from the tweeter narrows and the small shapes and edges around the dome begin to reflect sound. The waveguide, shown in green, and its proximity to the grille, also in green, prevents sound from being trapped in a cavity at the edge of the tweeter’s housing under the grille’s edge to prevent unwanted peaks and dips in the frequency response.

A
Timing
Problem

At much higher frequencies sound is directed into a narrow beam and is radiated from all points on the tweeter’s dome, but those sounds don’t arrive at the listener at the same time. The sound emanated from the top of the dome arrives slightly sooner than the sound that comes from the edge of the dome. At a frequency where this arrival difference is a half a wavelength, this misaligned arrival creates a cancellation, or a dip in the frequency response.

Acoustic
Time
Alignment

Placing the lens above the dome redirects the sound that leaves the top of the dome, extending its pathlength so it arrives at the listener at the same time as the sound from the edge of the dome.

Ideal Listening
Window
Response

Finally, the lens also redirects some of the energy contained in a response peak which exists in nearly every tweeter with a very stiff diaphragm at very high frequencies from the on-axis response into the off axis response where it will be attenuated by the longer arrival distance in the car. You can clearly see that the peak at 16kHz has been removed from the 0-degree and 15-degree response in the frequency response plot below. The frequency and the level of attenuation is determined by the size of the disc and its distance above the dome.

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