I'm aware of PulseEffects and I remember it didn't work out-of-the-box, just after setting it to the right direction. I examined every option of it and concluded it was a copy and paste of what we find in the Realtek High Definition Audio drivers for Windows.
If your hear it closely, this equalizer adds a bad 'static' to the sound acoustic, distorting the original audio. It does not provide a quality overall output, it is very poor.
It's useful if you wanna play around with the ambient effects, but it's the same as using a cheap set of speakers.
Now, the LADSPA EQ has a tremendous quality.
It doubles the power of your speakers! Has a perfect distribution of channels, every detail and nuance of the audio has definition, clarity and potency without any artificial layer.
I gotta say, undoubtedly, that only through this piece of software, you'll have a better audio than several so called audiophile and expensive speakers.
It's the cornerstone of my HTPC.
It must never die.