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Loudness & Miscellaneous Measurements

Using a 100Hz tone and various music selections, the maximum output of the sub placed at the intersection of two walls measured 107dB SPL at 0.5m. The four satellites pumped out 108dB SPL at 1KHz under the similar conditions before clipping (3% THD). The total usable output from the entire system is 110dB.

Input sensitivity, the amount of output from your soundcard needed to drive the 7500's to full boom levels wasn't rated at all and is another downside. Using an SBLive!, which cranks out a whopping 475mV to four channels, I was not able to distort the satellites. That's achieved with all the sliders at 100%! These speakers require an estimated 750mV-1000mV to drive them to maximum levels which no sound card I personally know of can muster.

Signal to noise, or the amount of hiss heard was the lowest (meaning worst) ever measured at TargetPC. Weighing in at 60.7dBC relative to full output. Hiss will probably not be heard though, as the satellites don't reproduce highs much beyond 10KHz anyway.

Input impedance measurements couldn't be directly taken due to the presence of the dreaded DC blocking capacitor. Again, BA chose the economy route when designing the 7500's by not using split voltage rails that don't require input blocking. Suffice it to say, informal measurements revealed no appreciable loading of the SBLive! soundcard.

While not entirely sound related, I did notice the rather poor satellite shielding. If the satellites are placed closer than 3-4 inches from a large monitor or if the volume is loud, the psychedelic color shift makes quite an appearance.

The woofer port center frequency measurement is a N/A because the entire woofer output emanates from the port normally.

Lastly, the crossover frequency, the frequency at which the sub stops producing sound and the satellites start measured 160Hz in the 2-wall environment and 150Hz in the nearfield environment. The satellite crossover frequency was a bit complicated. Technically measuring -3dB at 280Hz, it's curve extended smoothly much lower and will mesh fairly well with the sub's frequency when the entire system is place away from any walls.

Pictures

Sub Front
Sub Rear
Wart

 





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