Troels Gravesen Ekta-7741 Speaker Build

Thanks @Flushing Shadow. The tweak to the crossover was to flatten the midrange hump which did not sound that good depending on the recording. My quasi anechoic measurement at 50" (3x max baffle width) shows a flat response for the highs and mids but the bass region is chaotic (as expected). The slope is a function of the room, in my estimation.
 

Attachments

  • 7741 50 inches, var.jpg
    7741 50 inches, var.jpg
    60.3 KB · Views: 61
Sorry for the confusion re: efficiency. I have no way to measure the actual efficiency. What I was trying to say is that I do not need to turn the volume up as much as I do on my Sonus Faber speakers to get the same sound level. They are definitely more efficient than the old speakers.

Troels says he drives them easily with his tube amp. Read my comments in the builder's response on his website.
 
I'm glad you got it all sorted. One of the most important tools I have to diagnose bad crossovers is the impedance charts though. Next time you find yourself scratching your head over the results try measuring the impedance of the speaker. 🙂
 
Hello Mikewxyz!
One of the great difficulties of choosing one of Troels Gravesen projects is precisely the problem of not being able to listen. Most people who do their projects do not record the times when they heard their records. Others make the recording with low cost phone.
I humbly ask you to make a difference and publish on your YouTube channel a beautiful instrumental music and another with beautiful female voices so we can evaluate your beautiful Floor Standing
 
Hi Silvio: I know exactly what you mean although YouTube is not a great format for hi def audio. I was thinking of using Audacity to make some recordings but haven't done it - others things to do. I'll have a look. No promises.

To get you started, you can check out Teo's YouTube stuff -
He is one who influenced me and he uses a good microphone in comparing his three Troels builds.