Subwoofer Tests: SVS, Paradigm, Velodyne and more. - diyAudio
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Old 5th August 2005, 08:15 AM   #1
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Talking Subwoofer Tests: SVS, Paradigm, Velodyne and more.

Hey guys,

I stumbled upon this resources the other day. I thought it is definitely worth sharing.. It is best collection of home audio subwoofer tests I have come across so far. If someone is trying to find how to properly test a subwoofer, this is how you do it.

SVS: PC Ultra
Paradigm: Servo 15
Velodyne: DD-18


More HERE


My apologies if you've seen this before. If there is a better resource, please post a link, since I'm always looking for testing done by people other than the manufacturers.
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Old 6th August 2005, 05:57 AM   #2
mike.e is offline mike.e  New Zealand
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Also 'way down deep' Article

http://audioroundtable.com/HomeTheater/messages/78.html

In this multi-part review, home theater designer Keith Yates gets down and dirty with some of the most ambitious subwoofers on the planet. Six months, 5000 measurements, four dozen batteries, three sore backs, and two big bare spots on the lawn, all for one thing: to get to the bottom of the bottom end, to separate Real Wallop from Codswallop.

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Old 7th August 2005, 02:26 AM   #3
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Interesting links. I think the avtalk one has upset some people on avs though

Mike.e Have a look at the dd18 graphs here:

http://www.ultimateavmag.com/feature...ay/index4.html

Somethings not adding up. The freq response graph shows the 115dB and 110dB plots having the same spl as the 105dB plot at 21 Hz. Therefore the power compression graph should show the 110db plot as having 5dB power compression (yellow plot), and the 115dB plot as having 10dB power compression (red plot)

The power compression graph looks wrong to me....

Cheers,

Rob.
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Old 8th August 2005, 01:14 AM   #4
mike.e is offline mike.e  New Zealand
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Rob: After skimming through the article,what you say makes sense. But,what could be happening is the they are measuring ELECTRICAL output not acoustic,revealing the electronic protection circuits which have Dynamic EQ/shelving type filters.

Hah just realised that this is the THIRD 'way down deep',I must find the second aswell!

LOL 117% THD

Click the image to open in full size.

http://www.ultimateavmag.com/news/050704yates/
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Old 8th August 2005, 05:55 PM   #5
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2nd part :

http://www.guidetohometheater.com/sp...way/index.html

Mike I believe the dd18 'power compression' is electronically caused. ie: the servo circuit cuts back the excursion to lower distortion / prevent over excursion. Still the graphs don't look right to me..

The graphs were all acoustic measurements I believe.

Cheers,

Rob.
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Old 10th August 2005, 10:53 PM   #6
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I don't believe that the SVS-Subs are capable of the same high output levels of the Velodyne,but how is it possible that the DD-18 plays so deep,(What is the x-max of this driver???)

Would be interresting which of these super subs is capable of more than 120dB @ 30Hz 1m measuring

David
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Old 11th August 2005, 02:21 AM   #7
simon5 is offline simon5  Canada
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SVS subwoofers are quite capable beasts. They are quite large subwoofers, that's why they perform so well.

The DD18 excursion is probably very very large. It's also servo controlled for extended depth.
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Old 12th August 2005, 03:17 AM   #8
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I'd like to see a comparison of those to say an Adire Tumult with 1000watts in a say 4 cubic ft PR alignment tuned around 15hz
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Old 12th August 2005, 09:03 PM   #9
simon5 is offline simon5  Canada
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I'd also like to see a comparison between them and the subwoofer I built to see how far it is from them hehe!

I know it's not fair, but the subwoofer I built is quite capable, reaching 16 Hz at around 116 dB SPL in room. So I guess outside like they are testing, it would be around 105 dB. Just to check for fun the distortion levels graphs. That way I could know how real that 16 Hz is hehe!
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Old 13th August 2005, 12:53 AM   #10
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I think the ported or PRed tumult in 5 cubes could do 110db @15hz outside....
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