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DIYAudiphileElliottBridge
(@diyaudiphileelliottbridge)
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02/09/2019 9:30 am  

@lindelium18

Unfortunately if those were more spiked then it could be they were filtered out when doing the graph smoothing which they all do. You can see how much they smoothed it out next to the graph.


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123Toid
(@123toid)
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03/09/2019 11:40 am  

@123toid you were right. My 1k - 2k rise was (is) coming from the woofers but at this point, there’s very little chance I’m going to change it since I’d have to change the components not only on the woofers, but also the mid. 

It's up to you, but if you have a 10uF cap I would try to replace the 5.6 with a 10, I think that will help your rise.  If you don't have a 10, you could put two 5.6 caps in parallel to give you an 11.2uF just to try. 


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Lindelium18
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03/09/2019 1:43 pm  

@123toid

Yeah, I actually decided to basically just start all over. I found a work around for my measuring error on the woofers so I re-designed the crossover for all three and re-used any components I could (not many unfortunately). I also took the tweeter back to PE for an exchange and see if I get the same thing.  Sounds perfect, right?

Well, PE forgot to put one of the inductors (a big 5.5 mH) in the bag. Crap!  Well, they said they’d ship it to me for free.  Ok, patience isn’t my strong suit but ok... Then it got worse. I went to test the new tweeter before heading off to work. Guess what... dead on arrival. I hooked up another speaker just to be sure it wasn’t on my end and it was fine. So...back to PE to return this one and pick up my inductor. Unfortunately I can’t get back out there till next week probably. As the world turns I guess...


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123Toid
(@123toid)
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03/09/2019 10:56 pm  

@lindelium18

Lol, ah the joys of speaker building.  If you want to send me over the raw frequency response and impedance when you take the measurements, feel free.  I'll mess around with them to see if I can help the crossover design for you.  Or help you out if you get stuck in an area.


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Lindelium18
(@lindelium18)
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04/09/2019 1:40 am  

@123toid

Just checking, is there a way to get impedance besides DATS?  Otherwise, I’d be happy to send them over to you just to see what you come up with (at your leisure of course). Once I get the new tweeter, I’ll get a new response from it and send them over. Where should I send them?


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123Toid
(@123toid)
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04/09/2019 3:39 am  

@lindelium18

There's other ways to capture it, but you need a device like Dats to do it.  So, no.  You should be able to attach it here.  Just make it a rar/zip file or something equivalent and attach all the files on here.  If not, I'll PM you my e-mail.  But if you put them on here, others might also be able to chime in. 


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TVOR-Ceasar
(@tvor-ceasar)
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04/09/2019 9:38 am  

If you have a computer, Audacity, and a good amp you trust as your reference amp, then you could use this method.

http://sound-au.com/tsp.htm

As a matter of course, I suggest most people here take a gander at this whole site. So much goodness to absorb.

Use Audacity to create a slow sweep and take note of where the impedance starts to rise, peaks and flattens back out, then you can plot them and use Word or some other type of program that does graphs to plot up the curve.

-Charlie


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123Toid
(@123toid)
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04/09/2019 8:02 pm  

@tvor-ceasar

Cool. I didn't realize that was an option. That's why I love this forum!


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TVOR-Ceasar
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04/09/2019 8:58 pm  

We are not "All Knowing", but as a collective, we know A LOT. 😀

-Charlie


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TVOR-Ceasar
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04/09/2019 10:41 pm  

Then watch this video  by HexiBase and it's follow up, then the one labeled Measuring Woofer Break-in. Lots of T/S formulae there and how to use them.

-Charlie


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123Toid
(@123toid)
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05/09/2019 3:24 am  

I forgot about this one.  BUt this guy shows you how to built your own Dats module for pennies on the dollar. 

https://www.avsforum.com/forum/155-diy-speakers-subs/1340740-lilmikea-s-diy-impedance-measurement-jig.html


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ImCoKeMaN
(@imcokeman)
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05/09/2019 10:25 am  

Well I just spent a little time reading schematics and posts about that impedance tester, and the lilmike mic.  I don't really have any projects in mind that I need to make these, but I wouldn't be surprised if I end up ordering some parts anyway haha.  I feel like I'm close to starting down a slippery DIY speaker slope.  Still have a car to wrench on as a project though.  


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TVOR-Ceasar
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05/09/2019 3:03 pm  

I know I've seen something like the LilMike box in the past. You're talking 10-20 years ago, at least, so don't expect a pinpoint from me. I do know I was contemplating doing a computer hookup via either Serial Port or Parallel Port. Would have been the 386 or the Win98 computer, both ran QuickBasic which would have accepted the inputs. 

Hrmmm...

-Charlie


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Lindelium18
(@lindelium18)
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12/09/2019 12:07 pm  

E6836635 9272 4E19 B85F BD55CFA7D44E
BE19BED5 D983 4549 B325 7183D68657A7

Im not sure “hurray” is even close to what I shouted when I finally got a respectable frequency response to come out of this center channel!  The lows are there. (Most of) the highs are there! Vocals sound good and forward. And it even hits low too. I’m happy enough with it at this point (I’m not opening this thing up...ever) that I started finishing it; which is a pleather wrap in black. Once that is all wrapped up (see what I did there) she will be finished. Then, a short hiatus waiting for my DATS V3 and hopefully a response from hexibase before I start on my next two projects...entries for MWAF 2020. 

C406D880 660D 4352 98EE CB9F8D0C817C


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Lindelium18
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13/09/2019 2:51 pm  

50F6BB08 C011 40E2 A697 CE85A941ED65
C1DD0904 E13E 465B 9BC4 598CF5AF32DB

Fully finished. Grill cloth matches the room. Held on by magnets.  For never doing it before, I’m happy with the pleather wrap!  Thanks to everyone for their help along the way, especially @123toid


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