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.
Carver2 - No notch filter: High amplitude resonant modes below 1000Hz are seen to extend well past the 3mS limit of the plot. A high amplitude resonant mode at about 3000Hz is seen to extend past the 3mS point. Modes associated with the cavity resonance, between 5000 - 6500Hz fall below the -20dB level at about 2.6mS.
BG26 - No notch filter: Low frequency resonant modes below 1000Hz have fallen to low levels by 1.5mS. A resonant complex from about 1600 - 3000Hz falls below -20dB at about 2.5mS. The main cavity resonance complex, ~3800 - 7000Hz, has small ridges extending to or past the 3mS point.
BG26 - Notch filter: The notch filter is seen to have a beneficial effect upon the resonant modes from about 2000 - 7000Hz. There is little resonant activity in that range past the 1.5mS mark (above the -20dB level). The notch filter negatively influences the damping of the RD75 below 1000Hz. A resonant ridge between 200 - 300Hz extends past the 3mS mark with the notch filter installed. There is also a ridge at 500Hz that did not appear on the plot without the notch filter.
Conclusion: Compared without baffle and without notch filter, the Carver 60 driver is seen to be seriously underdamped below 1000Hz compared with the RD75 driver under the same conditions. Additionally, in the Carver 60 there is a high amplitude resonant mode at about 3000Hz that extends well past the 3mS limit of the plot.
| NO BAFFLE | Impulse Response | Frequency Response | YOU ARE HERE |
|---|---|---|---|
| BAFFLED | Impulse Response | Frequency Response | Waterfall FR |
| OTHER | Calibration |
