| service & support |
| FAQ's |
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| Mobile Audio Questions: |
| 1. |
What amplifier do I need to power my Cerwin-Vega speakers? |
| 2. |
How do I figure out the volume of my enclosure? |
| 3. |
If I have two dimensions for my enclosure how can I figure out the third dimension for a given box volume? |
| 4. |
Is it possible to shorten the tube length while maintaining the tuning frequency of the box? |
| 5. |
Sometimes the required port tube is too long to fit in the enclosure. Are there any other options to maintain the port area and tube length in my enclosure? |
| 6. |
Will the Stroker woofers work in a free-air or a periodic setup? |
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| Question #1: What amplifier do I need to power my Cerwin-Vega speakers? |
| Answer: We recommend using a Cerwin-Vega Mobile amplifier with an RMS power rating
as close as possible to, but not to exceed, the power rating of the speaker. By using as powerful and amplifier as safely possible. By using as much power as safely possible you will
lower the risk of driving the amplifier into clipping (distortion). This ensures that the speakers will receive good, clean undistorted power. |
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| Question #2: How do I figure out the volume of my enclosure? |
| Answer: To calculate the volume of an enclosure, multiply the dimensions in inches(length x width x height)
then divide by 1728. This will give you the total volume in cubic feet. Keep in mind that the volume needs to remain within a tolerance of + or - 5%. |
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| Question #3: If I have two dimensions for my enclosure how can
I figure out the third dimension for a given box volume? |
Answer: Find out the total volume in cubic inches that your enclosure needs to be. Then
multiply the two known dimensions (inches). The required box volume (in3) is then divided by the product of the two known dimensions. Example: The recommended box volume for
a given subwoofer is 2.0 cu ft. You know that the maximum height that your trunk will allow is 16", the maximum width is 24".
1) Convert the 2.0 cu ft to cubic inches: 2.0 x 1728 = 3456 cu in.
2) Multiply 16 (max. width) x 24 (max. height) = 384
3) 3456/384 = 9.00". This would be the depth of your enclosure.
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| Question #4: Is it possible to shorten the tube length while maintaining the tuning frequency of the box? |
| Answer: Yes. The port tube length can be shortened by reducing the total port area.
When the port area is reduced, the port tube length must be decreased as well in order to maintain the same tuning frequency of the box. But keep in mind that reducing the area
of the port will increase port turbulence and may cause the port to become noisy at higher power levels. If this is your only option, we recommend rounding the inner edges of the
port (at both ends of the port tube) or using a port with flared ends to reduce air turbulence at the port openings. |
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| Question #5: Sometimes the required port tube is too long to fit in the enclosure. Are there any other options to maintain the port area and tube length in my enclosure? |
| Answer: Yes. The port tube need not be straight. If necessary use a 90 degree elbow
joint (available from plumbing supply stores) in order to fit the tube inside the enclosure. When bending a port tube be sure to measure through the centerline of the port in order
to determine the effective port length. Remember, the open ends of the port tube must have room to "breathe". The port openings must be placed at a proper distance from any
surface; inside the box or out. The proper distance should be equal to or greater than the radius of the port opening. |
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| Question #6: Will the Stroker woofers work in a free-air or a periodic setup? |
| Answer: We have had some good results with our Stroker 15's in aperiodic applications,
however, for whatever reason they seem to only work well with panel/enclosure types, not the wave mod. Additionally this speaker is specifically designed for ported cabinet applications.
You will never get the full potential of a Stroker in another type of application. Other types are quite simply much less efficient. Additionally, the Stroker is a unique product in itself.
Resonance is fairly high so we don't feel it is the right choice for any type of aperiodic application. |
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