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Hi all.
I was finally able to get some preliminary measurements of this tweeter on a flat baffle (sort of infinite baffle) and with some custom waveguides. The Transducer labs tweeter is a ceramic dome tweeter. You can read about it here:
TDL N26C
First let me tell you how these were measured. I used Jeff Bagby's method of laying them on the floor and measuring with the mic directly above. In this case, the tweeter sits down in some wood that has a cutout in it. A piece of cardboard was placed over the wood to act as a baffle. A cutout was made in the cardboard to simulate a flush mount. The mic was set above the tweeter and at a distance of 27.25" or 69cm from the front plate of the tweeter. The gated window was 2.7ms to block out the main first reflections. The waveguides were simply set on top of the tweeter, held by their weight alone. Then some insulation was placed around the edges of the waveguides. Below are some photos so you can better envision the setup, which is sort of cobbled together.
I got my N26C's from Meniscus and they include a small metal mesh grill that can be attached over the ceramic dome to protect it. Below shows the flat baffle measurements with and without the mesh grill in place. The mesh grill appears to boost the response slightly on the upper end. All waveguide measurements were taken without the mesh grill as the waveguide throats are too small for them to fit.
The waveguides measured were prototypes created by DanP over at PE Tech talk. Dan created 3 custom waveguides that are a range of sizes and depths. The smallest one is 140mm dia.x33mm deep. The other two increased in size to 152mm and 165mm dia. with depths of 36mm and 39mm respectively. All the throat openings are 36mm. The face plate opening on the N26C is 34.5mm, according to the guys at Transducer Labs. I also tested the N26C in the MCM waveguide, which I understand is NLA.
These waveguides are made using an additive manufacturing process that sinters (lightly melts with a laser) successive 0.15mm layers of nylon/glass powder. Therefore, the possible geometries are not limited by traditional CNC or molding restrictions. I have some rectangular ones on the way to test with the B&G neo3.
I guess they can be painted, as long as they are sealed first; otheriwse they soak up the paint. They actually look pretty cool as they are, can be sanded and will hold screws like a dense wood, according to Dan. Of course, they are generally intended to be used as patterns to have waveguides either turned, created with a cnc or with a tool like the radarcarve. The latter is how the ones that Pete S. used in his Aurora 2ways were done, which were also patterned from waveguides that DanP fashioned for him to test.
In the next post I will show the waveguide results.
I was finally able to get some preliminary measurements of this tweeter on a flat baffle (sort of infinite baffle) and with some custom waveguides. The Transducer labs tweeter is a ceramic dome tweeter. You can read about it here:
TDL N26C
First let me tell you how these were measured. I used Jeff Bagby's method of laying them on the floor and measuring with the mic directly above. In this case, the tweeter sits down in some wood that has a cutout in it. A piece of cardboard was placed over the wood to act as a baffle. A cutout was made in the cardboard to simulate a flush mount. The mic was set above the tweeter and at a distance of 27.25" or 69cm from the front plate of the tweeter. The gated window was 2.7ms to block out the main first reflections. The waveguides were simply set on top of the tweeter, held by their weight alone. Then some insulation was placed around the edges of the waveguides. Below are some photos so you can better envision the setup, which is sort of cobbled together.
I got my N26C's from Meniscus and they include a small metal mesh grill that can be attached over the ceramic dome to protect it. Below shows the flat baffle measurements with and without the mesh grill in place. The mesh grill appears to boost the response slightly on the upper end. All waveguide measurements were taken without the mesh grill as the waveguide throats are too small for them to fit.
The waveguides measured were prototypes created by DanP over at PE Tech talk. Dan created 3 custom waveguides that are a range of sizes and depths. The smallest one is 140mm dia.x33mm deep. The other two increased in size to 152mm and 165mm dia. with depths of 36mm and 39mm respectively. All the throat openings are 36mm. The face plate opening on the N26C is 34.5mm, according to the guys at Transducer Labs. I also tested the N26C in the MCM waveguide, which I understand is NLA.
These waveguides are made using an additive manufacturing process that sinters (lightly melts with a laser) successive 0.15mm layers of nylon/glass powder. Therefore, the possible geometries are not limited by traditional CNC or molding restrictions. I have some rectangular ones on the way to test with the B&G neo3.
I guess they can be painted, as long as they are sealed first; otheriwse they soak up the paint. They actually look pretty cool as they are, can be sanded and will hold screws like a dense wood, according to Dan. Of course, they are generally intended to be used as patterns to have waveguides either turned, created with a cnc or with a tool like the radarcarve. The latter is how the ones that Pete S. used in his Aurora 2ways were done, which were also patterned from waveguides that DanP fashioned for him to test.
In the next post I will show the waveguide results.
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