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Originally Posted by Vivekphadnis What is happening is that the speaker cones are being driven beyond their maximum excursion. That is why they distort. That is why I said keep the volume within limits or you risk burning out the voice coils.
Aseem,
The high pass filter passes frequencies above the set frequency but it will not mean more bass since you are cutting off the lower frequencies. Remember, lower frequencies have more depth and that is the bass you hear. What you mean is the sound is louder and that gives the feeling of more bass.
allan, the punch you hear from a low frequency driver depends on the enclosure volume, how well it is designed and a million other factors. Though car speakers are meant to be free air ones, they will sound better in boxes. |
clarifications:
1) The physical limits of a loudspeaker often differ and are usually much less tolerant than the thermal limits. So a spekaer rated at say 100W rms might not be able to even handle 10W at 20Hz. This is becuase the speaker's cone is being pushed beyond it's designed limits. So while the speaker might not burn out the sound will be severly distorted. If you feel the need for more bass add a subwoofer. One sad truth about sound (no mater what Dr. Bose claims) to get low frequencies you have to move air. Sadder is the fact that to double the loudness at any particular frequencie one has to move about 8 times more air! ouch! I wont go into to the mathematics of this but anyone interested can access the AES papers.
2) The human ear is not a linear device. It is extremely non linear and at the same time it is extremely accurate (in the midrange). Tests have proven that between 250Hz and about 4000Hz the human ear is the most accurate device known. The non linearity of the human ear was fisrt comphrehensively documnted by Ms. Fletcher and Munson who published a set of curves documenting their findings. These curves have since been revised by the general principal is still the same. With the HPF off you are sending more bass to the speakers then with the HPF on. With the HPF on yor speakers can handle more power (read above explantion) and hence can sound louder but less "bassy".