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
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Amplifier
PCB
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TDA7370B
Amp
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Sub
Box
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Subwoofer
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Satellite
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Instructions
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