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The THOR12400 is a 12″ high powered pro woofer by AmpsLab. Her Power Handling is 400W RMS, 800W AES and 1,600W Max. Rated Impedance is at 8Ω and Sensitivity at 96dB.
Fig 1 is the RAW Frequency Response of the THOR12400 loaded onto a 53 liters Bass Reflex box with a baffle width of 16.25″. Her Frequency extends to 2kHz after which she starts to breakup.
Fig 2 is the Waterfall plot of the THOR12400. The breakup at 3kHz is clearly seen in the Waterfall.
The Toneburst plot in Fig 3 shows few unwanted energy (light blue slices) starting at 3kHz. For best performance, she should be used up to 2kHz.
The artifacts at 3kHz and beyond are clearly seen in the Spectrogram (Fig 4). When used with a Low Pass filter, these artifacts will be sufficiently reduced.
The THOR12400 has a fairly fast attack. Her apex in the Step response (Fig 5) is at 88 micro-sec. For a 12″ woofer, that’s impressive.
The Harmonic Distortion of the THOR12400 is equally impressive. 2nd hormonic is at -59.6 dBr while her 3rd is at -65.6 dBr.
I auditioned the THOR12400 without any crossover and she passed with flying colors. From here on, I will design 2-way speakers based on her. The THOR will be my first loudspeaker kit that I’m offering. It will include a THOR12400 woofer, a compression driver, a horn and a fully assembled crossover on a pcb. Unless otherwise stated, all measurements were made in Full Space (4 pi) with the mic at 36 ins, tweeter axis. Impulse Window=5ms. No smoothing applied. |
October 10, 2024PRO DRIVERS
Fig 1 – THOR12400 RAW Frq Response • Baffle Width = 16.25″
Fig 2 – THOR12400 Waterfall
Fig 3 – THOR12400 Toneburst Energy Storage
