We are excited to share the first set of measurements taken with our newest product – the SEA-330 Amplifier Test Fixture. The SEA-330 injects test signals into the SEA-310 Amplifier and measures Gain, Output Power, Total Harmonic Distortion (THD), and Frequency Response using advanced Digital Signal Processing (DSP) algorithms. The SEA-330 can fully test the SEA-310 Amplifier in just a few minutes.
Frequency Response Data
This curves below show frequency response from guitar input to speaker with the tone knob set for low, medium, and high. The curve labeled “Presence” shows the dip in the frequency response when presence is enabled.
Distortion Characteristic
We brag about the fact that the SEA-310 provides gradual distortion as the input level is raised. This provides a much warmer sound than an amp that simply hard limits. Here’s the data to show our distortion characteristic.
A few notes about this data: The input is applied to the Guitar input and the drive knob is set fully clockwise. The volume is set low enough so that the Power Amplifier (PA) does not contribute to distortion. The Total Harmonic Distortion (THD) measurement uses a narrow filter around each harmonic, so noise is eliminated from the measurement. Output power is measured as the power in the fundamental component at the speaker. The actual output power (all harmonics combined) is larger.
Power Amplifier (P.A.) Characteristic
The Power Amplifier doesn’t distort until it begins to clip around 8 Watts. The data below was captured by feeding a signal into the AUX input thereby bypassing the distortion amplifier. The gradual distortion from the gain amplifier combined with hard limiting from the PA can be used to create great effects!
