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Hello MechEngVic, thanks for your comment, The highs are too harsh. But only with Tube amps. When I use class D or transistor A/B there is no harsh sound. My next step is to change the filter: Good tip about the app, I will try it.

I did get a nice answer back from Danny from GR Research: Hey Michael, There is no resistor inline with the tweeter to make the top end have that higher impedance. It is just caused by the actual impedance's of the drivers. We can design an impedance trap that will knock out the hump that is at 3.5kHz. That will allow the amp to see a more balanced load. You can also try a 47 ohm to 30 ohm resistor across the tweeter terminals to knock the tweeter level down a little bit and bring it's impedance down a little at the same time. Thanks, Danny Danny did some updates on Klipsch loudspeakers RP-8000F, Forte III and RP-600M. Normal to design an new filter by this man means to ship the speakers to te shop...But I live in the Netherlands and those KG-5.2 are to big to ship 😀 I will try his option with the parallel resistor. Als will i check if I can upgrade the cabinet by making it stronger and damp more.

Hello Maynard, Thanks for your comment. Acoustics are well damped. It is a room wide = 440 cm, length = 600 cm and height = 320 cm . Listening chair is on 270 cm from the speakers. wooden ceiling, concrete floor with carpet. Here a pictue of the setup. The thing is that my Prima Luna that using a ultra linear circuit is sounding worse than my 300B single end without negative feedback. And when I switch to sollid state amp (class D or A/B) the harsh high tones are then gone. The impedance change DirtyErnie describes kills the quality of the high tones in combination with my tube amps. The bass responce is fine, no complaints. It is pure the high tones that are killing. The music I play: lots of jazz, some world music (good recordings like: Será una noche La segunda https://youtu.be/hMgFJOQNme0) and pop (mostly old stuff like Tom Waits 😀 ) Also other speakers doing really great with my tube amps.

Or if someone has already a tube friendly mod of this filter...Info is welcome

The filter schema in on this website. I will dive into this modification. I just wonder if all these adjustments will also change the sensitivity of the speakers?

Hello DirtyErnie, Thanks for the clear explanation. Then I think it is strange that people are looking for tube amps to combine with Klipsch loudspeakers. If I see the curves of other models Forte or Cornwall, I also see no good match with tubes I own a seperate listening room and have a collection of equipment. I really like tube amps, but my Magnepans also do not match. My Translator Reflexion (this is an old dutch brand) are perfect in combination with tube's http://www.translator-info.nl Sounds really nice with

Hello all, I'am a new owner of a set Klipsch loudspeakers and I experiance some good and bad with this set. The loudspeakers are Klipsch KG 5.2. I connect this set of speakers first to my 300B single end tube amp....not bad, but the sound in the high tones was not 100% satisfying. This is only a 6 a 8 watt tube amp, so I connect my Prima Luna ProLogue Four. This sounded more terrible. Oke it was connected to the 8 ohm tab....let's try the 4 ohm....nop, still terrible. I bought this set KG 5.2 second-hand and one woofer was not oké,. So I send the woofer to a repair shop and I was temporarily unable to use the Klipsch. When the woofer was repaired and build back into the loudspeaker an audio friend came by and brought a small class D amplifier with him (FX-Audio FX252A). We were prepared for the worst, this must sound even worse. but no, this sounded much better. The high was now pleasant and nice to listen to. I connected my Classic transistor A/B amp no 8.0B and it is getting even better. What I now think is that the impediance of this Klipsch loudspeaker is not tube friendly. And when I see other curves of impediance of other Klipsch loudspeakers I think: This will also not be a happy loving couple with tubes.... Don't get me wrong...I'am verry happy with my Klipsch KG 5.2 and I use my tube amps on other loudspeakers (V-Vox and Translator). Do other people share my experiance?