Ping _ Kent - Kaffimann

"Ping" Kent - Kaffimann,

If you are out there.
Re https://www.diyaudio.com/forums/full-range/319037-there-can-only-be-one-13.html

In the W5-2143 design "larger" box 20cm W X 25cm D X 30cm H

I am looking for clarification. My understanding is the slot part is not part of the chamber? I calculate 15L for the enclosure but your Horn Response picture indicates 16.7L

Adding the port volume brings me to the 16L figure.

Just want to be sure before I start cutting.

Thanks

Andrew
 
Hi Kent,


Nice that you're asking about me by making a new thread, perhaps I should take it as some form of compliment.

You should;)

I built your design for W5-2143 design "larger" box 20cm W X 25cm D X 30cm H

The issue I had was the volume in the Horn response plot was off ~1L from my calculations. Going from the box dimensions (which I somehow missed) I see where the port is separate from the speaker enclosure volume, add them and alls good enough.

I had two ML-TQWT designs, one tapered and one straight and your B.R. to decide amongst. I particularly appreciated your narrative and went with yours.



Thanks

Andrew
 
Certainly.

It will be at least a week or two though for an initial listen.
The speakers are new and I literally took one out of its box yesterday to verify my rebates for flush mounting.
I probably will not get back to them until the weekend with any luck, that's if the wife and grandson give me a chance:)

I like the proportions and with the 18mm plywood they are quite hefty.

Andrew
 
They are playing. Tested with NuForce DDA-120, 300B and EP84PP.
They are fantastic with the NuForce (Digital integrated amp), resolution, clean and clear from top to bottom. Bass without hang, reverberation, fantastic midrange and no need for a tweeter, this opinion within maybe 20 minutes of listening.

300B, did not expect much and did not get much so its okay.

EL84PP is in between the former amps, closer to the NuForce but still far away.

I think these drivers need an amplifier with a lower output impedance to sing.

The cabinet works, I built the larger one with the 3cm port and lined the sides, top, bottom and rear with carpet underlay, the Gray stuff about 10mm thick made with what looks like lots of thread in the weave. Thats it, nothing else at this stage. The bass more than surprised me. For lack of a better term it does not sound like ported box bass, no one note business here. Playing some Bela Fleck and you can follow the bass notes with ease. The only issue I have found so far which is not an issue yet is the bass is slightly lower in level to the rest of frequency bands. Perhaps some BSC / closer to rear wall / playtime will be needed but time will tell.

They are veneer worthy (my speaker test).

Thanks Kent, I owe you a brew.
 
I think these drivers need an amplifier with a lower output impedance to sing.
Yes, the lossy slot port can help the driver take a little bit more power. If you have about 60-90 completely clean watts per channel that would be good for cone control when testing loud, just pay attention to driver excursion. Also there is better dampening below fs, so it can protect your driver to some small extent if you play low frequency content.

The only issue I have found so far which is not an issue yet is the bass is slightly lower in level to the rest of frequency bands. Perhaps some BSC / closer to rear wall / playtime will be needed but time will tell.
I like to put all my boxes close to rear walls, but away from corners. Since the port is on the front it will often be easier to integrate, IE not quite so aggressive room loading.

Thank you for the feedback. :)