Hi, appreciate your help, to understand what crossover topology is used by Troels Graveesen in MUN 17 3 way design? It looks like LR2 but when entering figures in online calculators I am unable to match crossover parts values ...
Here is the link to http://www.troelsgravesen.dk/ScanSpeak-MUN-17-3W.htm#DRIVERS
Here is the link to http://www.troelsgravesen.dk/ScanSpeak-MUN-17-3W.htm#DRIVERS
And you won't match them with calculators. Troels uses a full set of driver measurements, and then applies the electrical xover's transfer function to the acoustic response and inherent rolloffs the drivers have, whilst keeping the impedance and it's phase in check and making a safe load for an amplifer.
Electrically, they are 3rd on tweeter, and 2nd on the mid bandpass filter. However, there is a contour on the mid that likely changes its rolloff characteristics. The acoustic rolloffs combined will not reflect 3rd order slopes.
Electrically, they are 3rd on tweeter, and 2nd on the mid bandpass filter. However, there is a contour on the mid that likely changes its rolloff characteristics. The acoustic rolloffs combined will not reflect 3rd order slopes.
Not to good to hear 🙂 I had a plans and now I need to reconsider lots of things ....
Then it's not Troels' design, and you're on your own. You can't substitute drivers for a given network, nor can you take a woofer network from one design and a tweeter network from another and put them together. The system consisting of the cabinet, drivers and their placement on the baffle (that is also not up for too much alteration), and the xover are all part of an optimized cohesive system that is defined for this one design and no other.
There is also no 'drop in' replacement 99% of the time when it comes to drivers and their boxes and xovers.
There is also no 'drop in' replacement 99% of the time when it comes to drivers and their boxes and xovers.
This is one of the rare open crossovers for a newer Troels design. Take advantage of it and use the same woofer.
If you must use a unique driver combination, you will have to roll your own.
If you must use a unique driver combination, you will have to roll your own.
As the previous poster said, this design is now open (I guess Jantzen weren't selling kits fast enough).
The crossover circuit is now posted here with the component values given in full.
I have completed a pair of MUN-17s, by the way, and can strongly recommend this project. My brief note on the build is on Troels' site.
Alex
The crossover circuit is now posted here with the component values given in full.
I have completed a pair of MUN-17s, by the way, and can strongly recommend this project. My brief note on the build is on Troels' site.
Alex
Troels has stated that it’s one of the few designs where driver choices chosen from the outset by Scan-Speak, IIRC.
Perhaps the NDA has expired. Perhaps they wanted to open source it. Either way, it sells more drivers for Scan-Speak.
Perhaps the NDA has expired. Perhaps they wanted to open source it. Either way, it sells more drivers for Scan-Speak.
Alex: thank you for a nice writeup. 28W in closed box, 18M and Be Revelator is exceptional combo when it comes to resulting sound quality. You got me interested in this tweeter. I know Bliesma Be tweeters and I am curious about how this Scan Speak sounds.