Thank you, yes it does indeed - and I tested it. The thing is it is way much less transparent compared to the direct route. I suppose the signal is converted A->D, then back to A. Anyway it sounded kind of dull, and it was hard to judge whether there is a benefit from less bass.
High-pass line filter to relieve main speakers from low frequency
Hi everybody
I recently purchased a subwoofer, KEF Kf92. It has a built in low-pass filter, 24 dB, that can be set from 40-140 Hz. They go with ATC SCM20sl. Their specs are: 80-20 kHz +/- 2 dB, 55-25 kHz : - 6 dB (free standing, which they are, actually: free hanging).
I wonder whether it would be beneficial to insert an high-pass filter before the power amp, consisting of a capacitor with a set point of 65 Hz. This filter might not have a huge impact because the frequency of the ATC SMC20sl rolls off quickly by itself below 80 Hz, apparently by about 12 dB/octave.
My thinking however is: the loudspeakers still receive the complete energy of the low bass from the amp. They might not be able to convert it into sound, but instead convert it into heat and distortion. So a filter will make the life of the amp and speaker easier, since at 33 Hz, only a quarter of the energy is produced.
Do you agree with me?
I recently purchased a subwoofer, KEF Kf92. It has a built in low-pass filter, 24 dB, that can be set from 40-140 Hz. They go with ATC SCM20sl. Their specs are: 80-20 kHz +/- 2 dB, 55-25 kHz : - 6 dB (free standing, which they are, actually: free hanging).
I wonder whether it would be beneficial to insert an high-pass filter before the power amp, consisting of a capacitor with a set point of 65 Hz. This filter might not have a huge impact because the frequency of the ATC SMC20sl rolls off quickly by itself below 80 Hz, apparently by about 12 dB/octave.
My thinking however is: the loudspeakers still receive the complete energy of the low bass from the amp. They might not be able to convert it into sound, but instead convert it into heat and distortion. So a filter will make the life of the amp and speaker easier, since at 33 Hz, only a quarter of the energy is produced.
Do you agree with me?
Showing 5 responses by b_mueller
I think the improvement in sound quality is pretty subtle, but it does seem to have a bigger effect the louder I play the system.@jaytor Thank you for your feedback. Your observations would be consistent with the theory: the louder, the more energy and distortions, scaling up exponentially with perceived loudness. |
I‘ve done it - added a 47 nF Duelund silver cap in line at the power amp‘s input. I soldered between Eichmann bullets plugs and sockets, allowing quick removal. I dislike any modification that adds sockets, wires, soldering points, but there was no space inside the amp. When I used pink noise and measured frequency response in the room, the drop below 60 Hz is steeper, as was predicted for a high pass. Furthermore, the woofer extends much less, indicating less low freq power reaches the chassis. On sound quality (with KEF Kf92) the effect ist not huge. There is a bit less stress and increased clarity. I will do more comparisons. https://ibb.co/gFP5Vxw |