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For the past five years I have been slowly planning my first ground up passive crossover design (I move slowly). Along with some waxing and waning motivation the learning curve has been steep for this project.This is my first ground up speaker design to include passive crossovers.I am getting close to completion and am excited to share some ideas about the final crossover design. I very much welcome feedback here given this is all new territory for me.
Goals: I wanted to design a floor standing, large format home theater front stage that is capable of reference level midbass. I wanted this to be a "cost is no object" design as it pertains to the drivers. I want this to be a two way system partly for ease of my first crossover design and partly because I do not have the height under my home theater TV to accommodate a three way design. Further, I would like the speakers to have a relatively narrow dispersion pattern throughout the frequency range so a large format midbass along with a horn loaded tweeter fit the bill nicely. The speaker needs to be flat down to about 60hz with the intention of crossing it to my Pyktis subs which I have already posted the completion of.
The speakers will have passive crossovers for the simplicity of amplification. My home theater system will consist of a 9.4.6 atmos setup so having double the amplification channels and extra boxes required for an active design is just not feasible. The speakers will be powered by an Emotiva XPA-3 Gen 2 which is good for 200 watts at 8 ohm and 300 watts at 4 ohms.
Driver selection: I have always been a fan of Acoustic Elegance and many have built designs with similar goals using these drivers. I chose the TD12M-8A model. These have the apollo upgrade. I also chose the Beyma TPL-150H horn loaded pleated diaphragm tweeter given their high efficiency and dispersion pattern that will match the 12" midbass at the intended crossover frequency. My original thought was to mimic the layout of the Vapor Audio Arcus using a TD10M but, after speaking with John he recommended the TD12M instead.
Name: My wife is Lithuanian and helped me name the design. They are called Joudas as this is the name of the color black in Lithuanian. They will be painted in flat black automotive paint exactly as the Pyktis sub was painted.
Enclosure: After measuring impedance and T/S parameters using DATS I designed a ported enclosure for the woofer using Woofer Box and Circuit Designer
The box is 94L And uses dual 3" ports flaired on both ends tuned to about 41hz. With an anticipated 80Hz HPF crosses to my subs vent velocity and excursion look good. In fact, I am good down to 50Hz full tilt at 300 watts if I so desire.
I went through several design iterations in Fusion 360 to get what I was looking for. The box is modeled at 20" x 30" x 15" external dimensions. It is heavily braced and has a double thick front baffle. The entire outside of the box is MDF. The second layer of the baffle is baltic birch. Initially I did not build a separate enclosure for the TPL-150H but after getting some feedback it was recommended to remove the rear cover and put its own sealed enclosure. The edge of the baffle is chamfered to improve edge diffraction and for aesthetics. Dual round 3" ports flared on both ends was used. The ports will be molded seamlessly into the front baffle.
In the next post I will post pictures of the enclosure build process to date
Goals: I wanted to design a floor standing, large format home theater front stage that is capable of reference level midbass. I wanted this to be a "cost is no object" design as it pertains to the drivers. I want this to be a two way system partly for ease of my first crossover design and partly because I do not have the height under my home theater TV to accommodate a three way design. Further, I would like the speakers to have a relatively narrow dispersion pattern throughout the frequency range so a large format midbass along with a horn loaded tweeter fit the bill nicely. The speaker needs to be flat down to about 60hz with the intention of crossing it to my Pyktis subs which I have already posted the completion of.
The speakers will have passive crossovers for the simplicity of amplification. My home theater system will consist of a 9.4.6 atmos setup so having double the amplification channels and extra boxes required for an active design is just not feasible. The speakers will be powered by an Emotiva XPA-3 Gen 2 which is good for 200 watts at 8 ohm and 300 watts at 4 ohms.
Driver selection: I have always been a fan of Acoustic Elegance and many have built designs with similar goals using these drivers. I chose the TD12M-8A model. These have the apollo upgrade. I also chose the Beyma TPL-150H horn loaded pleated diaphragm tweeter given their high efficiency and dispersion pattern that will match the 12" midbass at the intended crossover frequency. My original thought was to mimic the layout of the Vapor Audio Arcus using a TD10M but, after speaking with John he recommended the TD12M instead.
Name: My wife is Lithuanian and helped me name the design. They are called Joudas as this is the name of the color black in Lithuanian. They will be painted in flat black automotive paint exactly as the Pyktis sub was painted.
Enclosure: After measuring impedance and T/S parameters using DATS I designed a ported enclosure for the woofer using Woofer Box and Circuit Designer
The box is 94L And uses dual 3" ports flaired on both ends tuned to about 41hz. With an anticipated 80Hz HPF crosses to my subs vent velocity and excursion look good. In fact, I am good down to 50Hz full tilt at 300 watts if I so desire.
I went through several design iterations in Fusion 360 to get what I was looking for. The box is modeled at 20" x 30" x 15" external dimensions. It is heavily braced and has a double thick front baffle. The entire outside of the box is MDF. The second layer of the baffle is baltic birch. Initially I did not build a separate enclosure for the TPL-150H but after getting some feedback it was recommended to remove the rear cover and put its own sealed enclosure. The edge of the baffle is chamfered to improve edge diffraction and for aesthetics. Dual round 3" ports flared on both ends was used. The ports will be molded seamlessly into the front baffle.
In the next post I will post pictures of the enclosure build process to date
Attached Files
-Trevor
-Trevor
-Trevor
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