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ElliottDesigns
(@elliottdesigns)
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@tvor-ceasar

@123toid

Hi guys, it has been a while now. I was just wondering if you had any updates on testing for the project. 🙂

Elliott Dyson - Mechanical Engineering Student and 3D printing & Design Freelancer


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123Toid
(@123toid)
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@diyaudiphileelliottbridge

I need to apologize for not updating you guys. My dad went into the hospital and I put this on the back burner while that was going on. He is out now, so I am getting back to normalcy.

https://www.youtube.com/123toid


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TVOR-Ceasar
(@tvor-ceasar)
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I hope all is better with your dad and it was nothing permanent. Family first. 

Whenever you get to it is fine for me. I've been busy straight through all this and things are picking up even more, so... at this point, I'm just curious what they'd sound like with just a single high pass cap on the tweeter, say maybe a 15uF. That'd put it at about 2650 Hz. Just for a start.

Whenever it happens, just let us know. We're here and not going anywhere.

-Charlie
https://www.youtube.com/user/TheTrueVoiceOfReason


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TVOR-Ceasar
(@tvor-ceasar)
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Did a bit of looking at the drivers and my quick suggestion above. Threw them in XSim and scrolled the value up and down, and it looks like the value I picked was the best available via PE's Cap page.

15uFhighpass

So, this is just a starting point. Anyone else have a suggestion?

My only concern about much more complex designs is that they will most likely reduce the output of the PC-83, which will necessitate the attenuation of the ND16FA even more than the graph shows is needed. Of course, these are for desktop / nearfield and they are rated for 30 Watts, so there's that.

Also, I don't like the way that XSim plots the PC-83 falling off when it's connected full range. Maybe I'm missing something.

-Charlie
https://www.youtube.com/user/TheTrueVoiceOfReason


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123Toid
(@123toid)
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@tvor-ceasar

I think we are switching to the ND90-8 from the PC83-4.  This will make it more versatile.  I plan to make the box this week.  MY wife works weekends, so I don't get to work on projects during this time.  I watch the kids instead 🙂 

https://www.youtube.com/123toid


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TVOR-Ceasar
(@tvor-ceasar)
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Switching to the ND90-8 will drop the bottom end a good bit, FB ~63 Hz and F3 ~59 Hz, assuming the same 0.09 Cu.Ft. box. Port will change, but we can discuss that too. I'll have to download the files and re-run the simple X-over, but I can see the tweeter will need some attenuation, as it's about 12 dB louder.

-Charlie
https://www.youtube.com/user/TheTrueVoiceOfReason


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123Toid
(@123toid)
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@tvor-ceasar

I'll make sure to get the z offset and the anechoic chamber files for you guys as soon as I build the box. That way we can get an accurate representation of what it'll do.

https://www.youtube.com/123toid


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TVOR-Ceasar
(@tvor-ceasar)
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Simplest I could come up with that flattened out the massive hump of the tweeter vs. the full range. A little under $4 per speaker at PE. And yes, the tweeter is reversed. Looked real ugly in the normal position. And a lowpass on the Full range really didn't do anything to help, so why add complexity where it's not necessary.

ND90 8 ND16FA 4 X over
ND90 8 ND16FA 4 X over Freq
ND90 8 ND16FA 4 X over Imp

-Charlie
https://www.youtube.com/user/TheTrueVoiceOfReason


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123Toid
(@123toid)
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I really want to apologize for this being put on hold.  This was not my intention.  I didn't tell anyone, but my father got really ill and was in and out of the hospital.  THen we found out my brother in law was being deployed for an entire year.  So I helped him out, jsut getting his families new house (they just bought) ready.  THat way his family shouldn't need anything while he is gone.  But I am back and will get started on this in about a week.  I have a few other designs that I am finishing up.  I'll post some of them on here, including a $3,500 Home Theater speaker clone for about $350. I am in the process of finishing the design of those those. 

https://www.youtube.com/123toid


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TVOR-Ceasar
(@tvor-ceasar)
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Health and family first. You can't give a hobby/passion (even if it might bring income) the attention it deserves if you are divided over much bigger worries. Especially in the climate of today. To quote Charles M. Schulz, "You're a good man, Charlie Brown."

I do hope your father is better and better every day and that your brother-in-law comes back safe and whole.

Whenever you get around to the build is ok by me. I've got a lot to do in the next 2 months before I start the journey to a new me. That starts mid October, so hopefully by then I'll be better able to participate.

-Charlie
https://www.youtube.com/user/TheTrueVoiceOfReason


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pwarren3030
(@pwarren3030)
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I just found this thread. But I fear I've missed something. What is the aim of this speaker? Eg main speakers? bookshelf, bedroom, size, cost? You know all that basic stuff. Cheers Peter in Sydney.


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TVOR-Ceasar
(@tvor-ceasar)
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Currently, the goals are desktop use, preferably with an accompanying sub, such as the Mini Earthquake, designed by 123Toid. The beginning of this thread gives the generalities, but there is a point where the decision was made to change from the PC83 to the ND90, mostly because that is what is on hand. It's a good driver, just a bit lower output. Should be interesting once we get back into it.

Go ahead and start at the beginning to catch up. I welcome any and all input. This is, after all, a community build. Glad you could join in. Can't wait to see what your thoughts are.

***By "I", I mean we. After all, we are a small but growing family.

-Charlie
https://www.youtube.com/user/TheTrueVoiceOfReason


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