Originally Posted by dsully444
........It is the amp and Highpass that get me and how it all works........
For an amp, you need something with decent power but not crazy power. 150 watts or more when driving a 4 ohm load is probably okay.Two general types of amps
that differ in form factor.
A plate amp is single channel only, and designed to be bolted into a subwoofer enclosure. Here's a generic picture:
Normal chassis is just that - something that can be put into a conventional equipment rack or shelf that might look like this:
These aren't endorsements, just generic pictures! You can also use any regular mono, stereo or multichannel power amp that you might have lying around as long as it has enough power and is happy driving a 4 ohm load.The high pass filter
does just what the name implies. It blocks frequencies below a certian threshold, and pass
er frequencies. With this particular sub, the guru (lilmike) has recommended a 20 Hz high pass filter since there is a lot of distortion below 20Hz. So it's better to just block out those lowest frequencies instead of generating a bunch of distortion which may be audible. The filter is not like a brick wall. There is a gradual rolloff of the blocked frequencies (slope).MiniDSP
is a magic box that is a perfect high pass filter for this application.
DSP=Digital Signal Processor: a fancy name for a microprocessor that is optimized to deal with math needed for signal processing. It goes between the sub output from your receiver and the input to which ever power amp you choose. You can set the filter parameters by plugging in a laptop via USB. Note that the laptop is not required for operation, only programming. Once everything is set up the miniDSP does it's thing.
Since plate amps are designed to run subwoofers, they often have the high pass filter built in. Problem is, it might not be right for this particular sub design. Usually the filter parameters can be modified by changing out some components on the circuit board (resistors and capacitors) but that requires both information and electronics technical skills. But these will work:
Originally Posted by lilmike
The BASH 300 with the stock setup is a good fit for example, as is the non-boosted Dayton SA240
Also available are passive filters that just plug into the cable between the receiver and amp.
These aren't generally recommended because they may not have the right filter characteristics and may not be too precise. They come from the car audio world.
Hope this helps.