In Reply to: I beg to differ.... posted by kootenay on November 27, 2007 at 22:07:58:
I think we're talking at cross purposes. You think of bass as sustained low frequency energy. Most people do. I am talking about extended low frequency response. Certainly, having the many paralleled output devices and high capacity filter caps can offer great benefits for sustained low frequency response. What it won't do is give you extended frequency response when the woofer, in this case, has a 360uf capacitor blocking those frequencies. The filter I'm talking about does exactly the same job as the filter which blocks midrange frequencies from a tweeter. I don't think you would say that you can get much better midrange frequencies from a tweeter if you just give it more power, would you? That's the problem in the KEF 105, and in my experience it is the only speaker I've seen that puts a high pass filter in front of a woofer. In order to compensate for the electrical and acoustic rolloff represented in the KEF 105, you would have to set all the frequency controls on one of those consumer grade 10 band equalizers in the minimum position, except for the band for 30 hz. That band you would set to the maximum setting, giving a maximum difference of 20db. I'm not advocating doing that, I'm just saying that the deviation from flat response is that severe. Now if the series filter cap and parallel coil were taken out of the circuit, one could cut that deviation in half, but most people don't do that. They buy a bigger amp.
Bypassing or replacing the standard caps in the 'actual crossover' part of the circuit can be a benefit. However, KEF was trying really hard on the 105's, and I would guess that the most you could hope for would be achieving a different sound. Certainly, one could compare the differences of the caps by their equivalent series resistance and see whether or not there could be benefits.
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- RE: I beg to differ.... - corerosin 10:52:03 11/28/07 (1)
- A comment on my amp choice. - jsm 12:05:08 11/29/07 (0)