Microphone at 1 meter distance.
Microphone height: 1 meter for RD75; 1.21 meter for Carver 60.
MLS: 8 averages, 432/4096 point FFT, Half-Bingham window.
1/12 octave smoothing - Amplitude Axis @ 4dB per division.
Carver1 - No notch filter: High amplitude, underdamped behavior up to 1000Hz that is extending well past the 3mS limit of the plot. A strong ridge at 7000Hz, associated with the cavity resonance, is extending past the 3mS limit. A large resonant complex at ~2500 - 3800Hz extends past the 3mS point.
BG25 - No notch filter: Resonance modes below 200Hz, at 400-500Hz, and at 1000Hz extend past the 3mS limit. Resonance modes from about 3000-7000Hz, associated with the cavity resonance, die out before the 3mS point. The strong ridge at 12000-13000Hz is unexplained and probably represents a flaw in the driver. This ridge does not appear at all in the other RD75 driver.
BG25 - Notch filter: Use of the notch filter greatly attenuates the 3000 - 7000Hz range, with corresponding reduction in the resonance modes. Most activity in this range is attentuated past the -20dB mark by 2mS. The notch filter seems to negatively affect the damping of the RD75 below 1000Hz. An increase is seen in low frequency resonance amplitudes. The 12000-13000Hz ridge remains - this driver is probably flawed.
Conclusions: Both the Carver 60 and RD75 drivers compared in similar sized baffles, and WITHOUT notch filter show that the Carver 60 driver is severely underdamped below 1000Hz. High amplitude resonant behavior in the Carver extends well past the 3mS limit of the plot. Additionally, the Carver driver is seen to have large amplitude resonant behavior at ~3000Hz, extending past the 3mS mark, that is not associated with it's cavity resonance (at 6-7KHz).
| NO BAFFLE | Impulse Response | Frequency Response | Waterfall FR |
|---|---|---|---|
| BAFFLED | Impulse Response | Frequency Response | YOU ARE HERE |
| OTHER | Calibration |
