Great father and son project! Something else to do during lockdown, besides TV and video games.
Lovely. :^)
I suspect that the FonkenPrime is likely nearly 3 x larger than optimum for the Holey-Basket Coral. 8 or 16Ω ones?
dave
Guess I originally posted this in a thread intended for full range "drivers". 
I just finished the build this past winter.
Older Vifa NE123 4-ohm full rangers that I got from Planet10 a few (?) years ago. Thanks Dave, these are dandy little units! There was a later 4-ohm version that had a slightly different response. I made a contour circuit for these to smooth things out a bit.
Each box is 3.8 liters net volume. A 6.5 inch Dayton PR is used on rear, tuned to around 60 Hz. Boxes are made from white ash and teak.
Lesson learned for wood with significant oil content. The polyurethane remained tacky after a week or two, due to the oil in the wood mixing with the polyurethane. A little heat and more drying time was required. This can be avoided by applying acetone or naphtha (or similar) just prior to applying the polyurethane. Try to remember that for next time. The ash and teak complement each other nicely otherwise.
The center amp unit is a stereo class D chip amp with Bluetooth. It has an On/Off switch, an aux input (1/8" mini-stereo), a volume control, and plenty of indicator lights. There is a jack for a power supply input, and I added an external antenna as well. Inside is an add-on module for rechargeable batteries, which has a built-in circuit to prevent over/under charging.
This is my first full range project, and I've grown to like the sound. They were a house-warming gift for my wife's cousin. They love it btw!
These little 4-inch drivers are quite good. Currently there is an 8-ohm version of the NE123 that is available. I’m sure it is as good sounding, but may need its own smoothing circuit.
I just finished the build this past winter.
Older Vifa NE123 4-ohm full rangers that I got from Planet10 a few (?) years ago. Thanks Dave, these are dandy little units! There was a later 4-ohm version that had a slightly different response. I made a contour circuit for these to smooth things out a bit.
Each box is 3.8 liters net volume. A 6.5 inch Dayton PR is used on rear, tuned to around 60 Hz. Boxes are made from white ash and teak.
Lesson learned for wood with significant oil content. The polyurethane remained tacky after a week or two, due to the oil in the wood mixing with the polyurethane. A little heat and more drying time was required. This can be avoided by applying acetone or naphtha (or similar) just prior to applying the polyurethane. Try to remember that for next time. The ash and teak complement each other nicely otherwise.
The center amp unit is a stereo class D chip amp with Bluetooth. It has an On/Off switch, an aux input (1/8" mini-stereo), a volume control, and plenty of indicator lights. There is a jack for a power supply input, and I added an external antenna as well. Inside is an add-on module for rechargeable batteries, which has a built-in circuit to prevent over/under charging.
This is my first full range project, and I've grown to like the sound. They were a house-warming gift for my wife's cousin. They love it btw!
These little 4-inch drivers are quite good. Currently there is an 8-ohm version of the NE123 that is available. I’m sure it is as good sounding, but may need its own smoothing circuit.
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Bob, wonderful idea, very nice. If the distance between cone and ball is around 8.5 cm, there's your 2 Khz generator. It would be a nice experiment to flush mount the driver so that this cavity resonance is moved up in frequency and down in level.
thanks for the input, i will look into modifying the mounting and see what the effect might be. might be a bit as i am in the middle of another build.
bob g
https://www.diyaudio.com/forums/ful...ss-reflex-bookshelf-speakers.html#post6195511
MA Pluvia 7 Bass reflex.
MA Pluvia 7 Bass reflex.
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Yes before the round version. I've been listening to these for a couple of years now in a bookshelf ported cabinet, great sound really. I even built a pair of Auratone clones for my grandson with these drivers, he's driving them with a JVC 15 watt receiver through his phone. Every time I hear them I'm blown away and they'll play loud too. The t-line makes amazing bass down to the low 50's, supper smooth up to 10khz before they roll off.
Honestly they do such a great job playing music they can easily be forgiven for the missing top octave. I'm sure a lot of people discount this driver because of the measurements, but I really enjoy listening to them straight up!
Larry
Honestly they do such a great job playing music they can easily be forgiven for the missing top octave. I'm sure a lot of people discount this driver because of the measurements, but I really enjoy listening to them straight up!
Larry
Can you post pictures of the back and/or during the assembly?
They are really nice! Compliments for the exceptional build!