Surround Sound Speaker Systems
- Written by John E. Johnson, Jr.
- Published on 13 August 2009
- SVS STS-01 Floor-standing Speakers, PB10-NSD Subwoofer, and AS-EQ1 Subwoofer Equalizer
- Page 2: SVS STS-01 Speakers, PB10-NSD Subwoofer, and AS-EQ1 Design
- Page 3: The SVS STS-01 Speakers, PB10-NSD Subwoofers, and AS-EQ1 In Use
- Page 4: The SVS STS-01 Speakers and PB10-NSD Subwoofers On the Bench
- Page 5: Conclusions About the SVS STS-01 Speakers, PB10-NSD Subwoofers, and AS-EQ1
- All Pages
On the Bench
THD+N vs. Frequency results are shown below. Distortion at the low end goes above 5% at about 40 Hz. In general, distortion stays below 1% for most of the audible band.
Quasi-anechoic frequency response tests confirm my listening experiences that the response is higher in the frequencies below 500 Hz and above 4 kHz (first graph shown below). Going 300 off-axis resulted in less response above 8 kHz (second graph shown below).
The impedance curve indicates the speaker is 8 ohms nominal. The phase stays within Â± 400. These speakers should be easy loads for mass market receivers.
The first graph I want to show you is the THD+N at 25 Hz and 100 dB output, measured at 1 foot. With most 10" drivers, you might expect to see at least 10% distortion. Well, take a look at this graph. 1.3% THD+N. Remarkable!
Plotting THD+N vs. Frequency, with 50 Hz set to 100 dB at 1 foot, yielded the graph shown below. Distortion stayed below 3% from about 22 Hz all the way up to 200 Hz. Again, this is pretty amazing performance for a 10" driver, and it is also testament to the fact that having a large enclosure really makes a difference. The trend these days seems to be in small cube subwoofers, and even with a long-throw driver, it is still difficult to move a lot of air without significant distortion.
Here are the frequency response results (room response) at 15 feet (the distance from my listening position to the subs) with and without the EQ turned on. You can see that application of those numerous EQ bands allowed the response to be flat from 20 Hz up to about 100 Hz, which is well within the range (setting the subwoofer crossover in your receiver's bass management menu) of most home theater setups.
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