Audionaut
Major Contributor
This thread is about what you are currently planning or developing in the field of DIY speakers, or what you have wanted to build for a while but have not yet implemented.
These do not have to be finished projects. Initial considerations, rough concepts, or ideas where perhaps only the drivers have been chosen so far are just as interesting. If you are further along, feel free to go into as much detail as possible: driver selection, enclosure principle and volume, crossover frequencies, active or passive operation, DSP, amplifiers, simulations, measurements, and so on.
So the focus is less on presenting finished speakers and more on the question:
So > What would you like to build—and why exactly that?
I’ll start things off.
At the moment, I am considering a relatively compact but exceptionally powerful active living-room speaker together with and for a friend. He really likes the dynamics and authority of my own system with its two 8-inch PA coaxial drivers, but explicitly does not want a separate subwoofer. The idea is therefore to implement a classic large three-way speaker in a more modern and compact form.
The current choice for the woofer is the 4-ohm version of the B&C 12FG100. It is intended to operate in approximately 55–60 liters of bass-reflex volume, with a tuning somewhere around 31–32 Hz. The goal is not maximum deep bass at any cost, but a clean, usable in-room response down to approximately 30 Hz while retaining a very large amount of dynamic headroom.
Above that, the new B&C 8CXN64 will operate as an 8-inch coaxial driver. The woofer would probably hand over to the low-frequency section of the coax somewhere around 150 Hz. The exact crossover frequency will of course be determined later based on measurements and could, for example, end up somewhere between approximately 120 and 180 Hz.
This means that the 8CXN64 will cover practically the entire range relevant for localization and spatial imaging as a coaxial point source. The crossover between its 8-inch cone driver and the integrated compression driver will probably be somewhere in the range of approximately 1.2–1.5 kHz, also depending on the measurements.
The entire system is intended to be fully active and DSP-controlled. At the moment, I am considering one WONDOM JAB6 per speaker. The 4-ohm 12FG100 makes better use of the available amplifier power than the 8-ohm version, while the midrange and tweeter require comparatively little power anyway.
The basic division would therefore be approximately:
B&C 12FG100/4:
approx. 30–150 Hz
B&C 8CXN64 LF:
approx. 150 Hz to 1.2–1.5 kHz
B&C 8CXN64 HF:
from approx. 1.2–1.5 kHz
The speaker is explicitly not intended to become a PA speaker, but rather a very powerful living-room speaker for an area of around 50 m²: high maximum output as headroom, low distortion, genuine deep bass without an additional subwoofer, and a relatively compact enclosure at the same time.
For the enclosure, I am currently thinking of standard MDF with internal bracing. The coaxial driver would have its own small, well-damped sealed chamber. Overall, the net internal volume will probably be somewhere around 65–70 liters per speaker, plus the port, drivers, bracing, and electronics.
The project is still in the concept phase. The final bass-reflex tuning, port dimensions, crossover frequencies, and DSP corrections will only be determined after simulations and measurements.
I would be interested to hear what you are currently planning. Projects that exist only in your head so far are very welcome too.
These do not have to be finished projects. Initial considerations, rough concepts, or ideas where perhaps only the drivers have been chosen so far are just as interesting. If you are further along, feel free to go into as much detail as possible: driver selection, enclosure principle and volume, crossover frequencies, active or passive operation, DSP, amplifiers, simulations, measurements, and so on.
So the focus is less on presenting finished speakers and more on the question:
So > What would you like to build—and why exactly that?
I’ll start things off.
At the moment, I am considering a relatively compact but exceptionally powerful active living-room speaker together with and for a friend. He really likes the dynamics and authority of my own system with its two 8-inch PA coaxial drivers, but explicitly does not want a separate subwoofer. The idea is therefore to implement a classic large three-way speaker in a more modern and compact form.
The current choice for the woofer is the 4-ohm version of the B&C 12FG100. It is intended to operate in approximately 55–60 liters of bass-reflex volume, with a tuning somewhere around 31–32 Hz. The goal is not maximum deep bass at any cost, but a clean, usable in-room response down to approximately 30 Hz while retaining a very large amount of dynamic headroom.
Above that, the new B&C 8CXN64 will operate as an 8-inch coaxial driver. The woofer would probably hand over to the low-frequency section of the coax somewhere around 150 Hz. The exact crossover frequency will of course be determined later based on measurements and could, for example, end up somewhere between approximately 120 and 180 Hz.
This means that the 8CXN64 will cover practically the entire range relevant for localization and spatial imaging as a coaxial point source. The crossover between its 8-inch cone driver and the integrated compression driver will probably be somewhere in the range of approximately 1.2–1.5 kHz, also depending on the measurements.
The entire system is intended to be fully active and DSP-controlled. At the moment, I am considering one WONDOM JAB6 per speaker. The 4-ohm 12FG100 makes better use of the available amplifier power than the 8-ohm version, while the midrange and tweeter require comparatively little power anyway.
The basic division would therefore be approximately:
B&C 12FG100/4:
approx. 30–150 Hz
B&C 8CXN64 LF:
approx. 150 Hz to 1.2–1.5 kHz
B&C 8CXN64 HF:
from approx. 1.2–1.5 kHz
The speaker is explicitly not intended to become a PA speaker, but rather a very powerful living-room speaker for an area of around 50 m²: high maximum output as headroom, low distortion, genuine deep bass without an additional subwoofer, and a relatively compact enclosure at the same time.
For the enclosure, I am currently thinking of standard MDF with internal bracing. The coaxial driver would have its own small, well-damped sealed chamber. Overall, the net internal volume will probably be somewhere around 65–70 liters per speaker, plus the port, drivers, bracing, and electronics.
The project is still in the concept phase. The final bass-reflex tuning, port dimensions, crossover frequencies, and DSP corrections will only be determined after simulations and measurements.
I would be interested to hear what you are currently planning. Projects that exist only in your head so far are very welcome too.
.
