Due to the design, the LoudSnail should be almost resistant against resonances. Therefore it was interesting to see how good it really works. Due to some problems in the measurement setup and the prototyping setup, there are some flaws in the measurements. However it is already possible to see effects of damping.
Let’s start with the free-air mode:
There is a small resonance at about 2kHz, everything als looks nice.
Now put this driver in the LoadSnail housing:
Hmm, that doesn’t look optimal. There are resonances at about 400 and 550Hz. It is interesting to see, that this corresponds to 83cm and 62cm wavelengths. The snail housing itself is much smaller.
Lets put a small piece of damping in the housing:
Looks already better, but not perfect. Should we try more damping?
Looks even better. There is much more space for more damping, but I want to keep the amount minimal.
Do these resonances in the impedance graph have any impact on the sound quality? I don’t know yet, because the speaker is not ready yet. There is still a lot of work to do. More measurements will come (but not in the next days). Stay tuned!
The plan for the LoudSnail has changed – it will be a single-chassis fullrange setup. I will use the excellent Jordan JX92S. This driver is not available from Jordan anymore. But it seems, that the driver is now sold by EAD under the name EAD E100. This is not a cheap driver, but it’s worth the money.
There is still a lot of work to do, but now it should be clear how it should look like:
After about 20 hours of milling, the parts for the first woofer enclosure are finished.
There is still a lot of work to do, but I want to post some pictures of the progress today:
I’ve started with the milling for the new LoudSnail speaker. This is my first CNC project. As expected not everything worked as planned. But in general, the idea seems to work. Milling MDF is an easy job for the CNC machine. But using a 3mm endmill and 0.2mm resolution takes time. Milling the large piece took over one hour. Next time I will try to increase the feed rate to 4800mm/min. This should speed up things a bit.
Many people know the B&W Nautilus. I’ve never listened to those, but I love the design. With modern CNC machines it should be possible to create a similar speaker at home. Here starts the LoudSnail project. I will build a 2-way speaker that is equipped with a 13cm midwoofer and a small 25mm tweeter.
The first challenge: create a spiral base. This is relatively easy. I used a logarithmic spiral for it. Unfortunately FreeCAD has no spiral formulas build in. Therefore I had to write my own Python script to create this spiral. The result looks promising: