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I have 2 velodyne subs the small/old 1 is model VA8100X and the 2nd and larger sub is model DLS5000R.
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There's a tremendous temptation when we move up the food chain to a large 15" monster like the DLS5000R, to want to still use out original smaller subwoofer. This practice is never a good decision, but everyone usually goes through it.
The VA8 is a small 100 watt 8" subwoofer that has a response that's down -3dB by the time it hits 35Hz.
The DLS is a 600 watt 15" sub that has a response that extends to 23Hz.
What happens when we combine these two is that the response of the larger sub dumbs down to the response of the challenged sub.
This is a result of the SPL levels in the room adding for shared frequencies. As an example, both these subs are capable of producing 50Hz quite nicely, and when played in concert, the output is additive and as a result you will adjust their level to achieve a certain overall SPL level. What happens at 25Hz? Only one of the two subs is capable of producing that frequency, yet it has trouble doing so since you've turned it down to accomodate the challenged sub being turned on.
My advice. Use the single 15" and see what you can get out of it.... If you require more SPL level, add a sub with similar response
brucek