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Loudness & Miscellaneous Measurements

Using a 100Hz tone and various music selections, a total maximum output with the sub placed at the intersection of two walls measured 107dB SPL at 0.5m. The satellites squawked out 107dB SPL at 1KHz under the similar conditions before clipping (3% THD). The total usable output from the entire system is 108dB.

Input sensitivity, the amount of output from your soundcard needed to drive the 3025's to full boom levels was rated at a high-ish 300mV, which most sound cards cannot muster. However, it measured 449mV, which immediately eliminates the vast majority of sound cards. Even with the venerable SBLive!, I had to almost crank the pre and total outputs up to their max positions.

Signal to noise, or the amount of hiss heard was the highest (meaning best) ever measured at TargetPC. Weighing in at 88.3dBC relative to full output, these units were dead quiet, even with no input.

Input impedance measured a high (meaning good) at 19.8KOhms and 19.6KOhms for the left and right channels respectively. No sound card will "load down" or be stressed simply by being plugged into the input of the 3025's.

The woofer port center frequency measured 50Hz, which was a reasonable choice for the 5" driver. This sub unit will have significant output to just under 50Hz, which is what the FR curves show.

Lastly, the crossover frequency, the frequency at which the sub stops producing sound and the satellites start measured a nominal 170Hz.

Pictures

Amplifier PCB
TDA7370B Amp
Sub Box
Subwoofer
Satellite
Instructions

 

 





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