Hi
I would like (for the first time) to build a closed box, volume around 65 liters.
As woofer I have an Eton 8-412/C8/32 HEX
As tweeter I have a Visaton KE25SC (which I like a lot)
I also have a pair of Eton 4-212/C8/25 Hex cone midranges
The question is: 2 ways or 3 ways.
When looking at the frequency responses the woofer is usable until 2000Hz, and the tweeter is usable from around 1200Hz. My guess is that a 2 way would easily be possible using higher order filters, but I am not sure...
Any opinions would be highly appreciated.
Thank you and best regards
Christoph
I would like (for the first time) to build a closed box, volume around 65 liters.
As woofer I have an Eton 8-412/C8/32 HEX
As tweeter I have a Visaton KE25SC (which I like a lot)
I also have a pair of Eton 4-212/C8/25 Hex cone midranges
The question is: 2 ways or 3 ways.
When looking at the frequency responses the woofer is usable until 2000Hz, and the tweeter is usable from around 1200Hz. My guess is that a 2 way would easily be possible using higher order filters, but I am not sure...
Any opinions would be highly appreciated.
Thank you and best regards
Christoph
Attachments
I know this post is a bit old, but I'm curious how you made it. Also, where did you get the 8-412/C8/32 HEX? I cant find it anywhere
Hi. I still did not make it but I recently bought the wood 😊… Will post when done. Eton is hard to get. I bought them from the Swiss distributor wavecontrol.ch. But Eton makes or made great drivers.
By the way each time I posted a question here there was no response. So i don‘t visit this forum often anymore.
best regards
Christoph
By the way each time I posted a question here there was no response. So i don‘t visit this forum often anymore.
best regards
Christoph
Soundimport just listed them but not this specific driver. Very weird. You’re from Genf, do you speak German?
Hi, if you have modeled the sealed bass response to be acceptable, then I would tend towards going for a 3 way, as you already have the drivers and this format is not very different from say one of Troels' 3 way classic designs. More complex to design than a 2 way, but with the promise of better midrange performance, plus an easier life for the tweeter from being able to raise the crossover point to 2-3khz, again for less distortion.
I found some suggested alignments for this driver from a cached Google page
https://www.madisoundspeakerstore.c...rs/eton-8-412/c8/32-hex-symphony-ii-8-woofer/
The max suggested Vb is 40L, so if you make a floorstander version, you can close off the bottom area.
This does look like a good woofer for a sealed box; quite rare these days.
Measurements for the 3" version of the driver suggest XO can be from 300hz-400hz onwards to 3khz or so; should be similar for the 4" version
https://hificompass.com/en/speakers/measurements/eton/eton-3-212/c8/25-hex
Although ported with the stepped baffle, Troels' design using an Eton mid can be studied, too - he chose XO of 650hz and 2300hz.
http://www.troelsgravesen.dk/ScanSpeak-3WC-C-Eton.htm
https://www.madisoundspeakerstore.c...rs/eton-8-412/c8/32-hex-symphony-ii-8-woofer/
The max suggested Vb is 40L, so if you make a floorstander version, you can close off the bottom area.
This does look like a good woofer for a sealed box; quite rare these days.
Measurements for the 3" version of the driver suggest XO can be from 300hz-400hz onwards to 3khz or so; should be similar for the 4" version
https://hificompass.com/en/speakers/measurements/eton/eton-3-212/c8/25-hex
Although ported with the stepped baffle, Troels' design using an Eton mid can be studied, too - he chose XO of 650hz and 2300hz.
http://www.troelsgravesen.dk/ScanSpeak-3WC-C-Eton.htm
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First I'd give a 2 way combination a shot but with an addition of a Visaton waveguide which accidentally matches Visaton tweeter just fine. This is the right path that will lead you to a success, assuming you master a reasonable x/o filter. Sorry I did not notice this post earlier.
A crazy idea LX521-like, https://www.diyaudio.com/community/threads/1-order-crossover-help.391332/post-7151405
8" in 65L sealed sounds like a really nice idea. Apparently, bigger boxes tend to produce more "box noise".
If the cone is 0.03kg and the magnet weighs 1kg, you can roughly estimate the amplitude of vibration. The gain of those vibrations will be roughly multiplied by the surface area of the box. This is why I'm at pains to come up with different ways of mounting the speaker in my recent builds.
In one build, the magnet is jammed up against plywood bracing that connects directly to the sides and rear of the enclosure. It's not perfect, but to my ears the sound is clear and neutral with minimal boxiness, even though the plywood itself is thin and light. Due to the light total mass (Mark Audio CHN-50 in 4 litres, 6mm ply, cuboctohedron shape, ~1kg) it's easy to feel box vibrations by hand, and these can be transmitted to other surfaces, possibly causing distortion even if the box itself is moving very linearly.
Future enhancement: special stands to suspend the small boxes on strings. Maybe OCD, but should be cool.
In a dipole design that I'm slowly going through, my old Eton 7 Hex mid / mid-bass will have its magnet clamped to a vertical slice of granite located behind the baffle at 90 degrees. The baffle will have an oversized hole to fit a gasket between it and the speaker, like a second surround. Unless my intuition is way off, baffle vibrations caused by the air pressure differential should be much lower than vibrations from a magnet directly bolted to it. The block of granite will simply have rubber feet, and some care may have to be taken to keep the gasket in alignment when moving the speakers.
Another design in progress:
12" in 70L(?) sealed. I want low bass from this one, but also good mid-range so I can make it part of another 2-way. I'm still thinking of ways to modify the above technique to make it robust with a closed box. E.g.: spoke arms extending out from the speaker inside the box. Then suspending the arms with soft rubber (bouncy balls cut in half?!) to minimise vibration transfer. But it's all a compromise since the damping tends to distort and then this energy is amplified by large surface areas. And the variable load is reflected back to the motor and cone. So another variant: the speaker is suspended with strings.
If the cone is 0.03kg and the magnet weighs 1kg, you can roughly estimate the amplitude of vibration. The gain of those vibrations will be roughly multiplied by the surface area of the box. This is why I'm at pains to come up with different ways of mounting the speaker in my recent builds.
In one build, the magnet is jammed up against plywood bracing that connects directly to the sides and rear of the enclosure. It's not perfect, but to my ears the sound is clear and neutral with minimal boxiness, even though the plywood itself is thin and light. Due to the light total mass (Mark Audio CHN-50 in 4 litres, 6mm ply, cuboctohedron shape, ~1kg) it's easy to feel box vibrations by hand, and these can be transmitted to other surfaces, possibly causing distortion even if the box itself is moving very linearly.
Future enhancement: special stands to suspend the small boxes on strings. Maybe OCD, but should be cool.
In a dipole design that I'm slowly going through, my old Eton 7 Hex mid / mid-bass will have its magnet clamped to a vertical slice of granite located behind the baffle at 90 degrees. The baffle will have an oversized hole to fit a gasket between it and the speaker, like a second surround. Unless my intuition is way off, baffle vibrations caused by the air pressure differential should be much lower than vibrations from a magnet directly bolted to it. The block of granite will simply have rubber feet, and some care may have to be taken to keep the gasket in alignment when moving the speakers.
Another design in progress:
12" in 70L(?) sealed. I want low bass from this one, but also good mid-range so I can make it part of another 2-way. I'm still thinking of ways to modify the above technique to make it robust with a closed box. E.g.: spoke arms extending out from the speaker inside the box. Then suspending the arms with soft rubber (bouncy balls cut in half?!) to minimise vibration transfer. But it's all a compromise since the damping tends to distort and then this energy is amplified by large surface areas. And the variable load is reflected back to the motor and cone. So another variant: the speaker is suspended with strings.