frequency response 25-120 Hz (±3dB)
continuously variable 40-120 Hz low-pass crossover
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So does that mean that this sub can go as low as 22hz? 25hz-3db ext? That what i was told but just need clarification. Btw, its a Velodyne DSL-4000R.

frequency response 25-120 Hz (±3dB)
continuously variable 40-120 Hz low-pass crossover
--------------------------------
So does that mean that this sub can go as low as 22hz? 25hz-3db ext? That what i was told but just need clarification. Btw, its a Velodyne DSL-4000R.


Generally, yes it does. Other things come into play as well, like placement and room gain.

frequency response 25-120 Hz (±3dB)
continuously variable 40-120 Hz low-pass crossover
--------------------------------
So does that mean that this sub can go as low as 22hz? 25hz-3db ext? That what i was told but just need clarification. Btw, its a Velodyne DSL-4000R.
You can't subtract dB's from Hz. Hz is a measure of frequency or pitch. dB is a measure of loudness.

frequency response 25-120 Hz (±3dB)
This means that the subwoofers loudness will vary by more not than 6 dB (+3 to -3), over that frequency range. IOW, at any frequency between 25 and 120 Hz, the loudness will be no more than 3 dB higher or lower than at any other frequency. The -3 dB point of 25 Hz means that the sub will have dropping loudness below 25 Hz. Since it's a "bass reflex" design, it's loudness will drop off pretty rapidly.

continuously variable 40-120 Hz low-pass crossover
This is not a "specification" as much as it is a "feature". The low pass filter is used to remove higher frequencies from the subwoofer signal. It's primary use is for situations where the sub is connected at speaker level. Whatever frequency it is set at is the frequency below which it will allow the low frequencies to "pass" to the subwoofer. IOW, it sets the crossover frequency between the speakers and the sub. If the connection is made at line level, (to the subwoofer output jack of the receiver), this control is bypassed.

Craig