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  • adam215
    started a topic New Build Advice...

    New Build Advice...

    Hey Guys,

    I want to build some new mains for my living room and I was looking for some advice. I was considering the original Continuums as I already have a pair of RS28A-4 tweeters from my last build that I could recycle. I also see that the first Continuum is available as a kit with woofers only at another website. My only hesitation is that I would like to have the option to add a center channel in the future and I know that there is no specific matching center for these speakers.

    For that reason I am also considering the Swope HT because it has a matching center.

    The limiting factors are as follows: The speaker needs to be a bookshelf that performs well when placed near the wall due to space restrictions, there is built-in cabinetry near the front of the room so floor standers are out. My room is pretty big, about 25' x 30', and sometimes I like to play music loud. I have 2 subs placed at the front of the room so bass extension isn't a huge priority. I really just want a nice, wide and detailed soundstage that can play loud if needs be.

    I also have a pair of Vifa NE180W-4 woofers from my last build. So if anyone knows of a build that incorporates the RS28A-4 and NE180W-4 and meets my above needs, let me know.

    Thanks for any help.

  • adam215
    replied
    Originally posted by rpb View Post

    Correct, and the resistor values can be changed to tweak different frequencies by a few dB in the area of the notches. Buy extra parts for tweaking if you don't have some already. Also, assemble the x-over external, so that you can touch resistors, and see if they get warm at all under high spl conditions.
    Thx everyone, I'm away on a camping trip (ugh) right now but when I get back I'm going to start building the cabs. Do you think this general xo design, barring any tweaks, is my best bet? If so, I'll start pulling together the parts. Thx again!!

    Leave a comment:


  • Kornbread
    replied
    And if you have some of those cheap alligator jumpers you can easily switch between crossover components and see what kind of difference that makes.

    Leave a comment:


  • rpb
    replied
    Originally posted by Wolf View Post
    Note that some resistors are not real resistors, and are coil DCR or a combination of DCR and real resistor.
    Wolf
    Correct, and the resistor values can be changed to tweak different frequencies by a few dB in the area of the notches. Buy extra parts for tweaking if you don't have some already. Also, assemble the x-over external, so that you can touch resistors, and see if they get warm at all under high spl conditions.

    Leave a comment:


  • Wolf
    replied
    Note that some resistors are not real resistors, and are coil DCR or a combination of DCR and real resistor.
    Wolf

    Leave a comment:


  • rpb
    replied
    Originally posted by adam215 View Post
    Click image for larger version

Name:	Last Schema.png
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    Does this look like what you have?
    Yes. That's correct.

    Leave a comment:


  • adam215
    replied
    Click image for larger version

Name:	Last Schema.png
Views:	1
Size:	8.7 KB
ID:	1419577
    Does this look like what you have?

    Leave a comment:


  • rpb
    replied
    Woofer

    ne180 on baffle simulated.frd

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  • rpb
    replied
    Tweeter

    rs28 on a baffle simulated.frd
    Attached Files

    Leave a comment:


  • rpb
    replied
    ne180 on baffle simulated.frd
    Originally posted by adam215 View Post

    Wow, that's a big xover. I'll put those values into my software and see if I get similar results
    There's a spot for many parts, and different layouts. Most are unused in our sim. The funny thing is, after you use the software a while, you seldom need to look at this layout.

    I need to post the modified files for the 9 x 14 baffle. Let me see if I can find them.

    Leave a comment:


  • adam215
    replied
    Originally posted by rpb View Post

    The layout is pretty much like the one in post 48, and 56. Here's the PCD layout. Some of the x-over locations are labeled on my sim. The notches are not, since there are three potential positions. (All three are on the far right side.)

    Click image for larger version  Name:	PCD LAYOUT.jpg Views:	1 Size:	177.3 KB ID:	1419507
    Wow, that's a big xover. I'll put those values into my software and see if I get similar results

    Leave a comment:


  • rpb
    replied
    Originally posted by adam215 View Post

    Do u mind posting the schematic so I can see how it should be laid out?
    The layout is pretty much like the one in post 48, and 56. Here's the PCD layout. Some of the x-over locations are labeled on my sim. The notches are not, since there are three potential positions. (All three are on the far right side.)

    Click image for larger version

Name:	PCD LAYOUT.jpg
Views:	1
Size:	177.3 KB
ID:	1419507

    Leave a comment:


  • a4eaudio
    replied
    Originally posted by adam215 View Post
    Do u mind posting the schematic so I can see how it should be laid out?
    In Passive Crossover Designer there is a grey button below the woofer and tweeter sections that says "View PCD Circuit Layouts". If you click it, it will unhide a tab called Printout (you can actually see the grey tab in rpb's image in post #114). This shows a generic layout for the woofer and tweeter with inductors (L1, L2, L3,...), capacitors (C1, C2...) and resistors (R1,...) labeled. If you hover the mouse over the cells in the woofer and tweeter areas a comment box will will pop-up showing what position that cell refers to. You should be able to look at rpb's values in certain cells and match them up to the generic circuit layout.

    I don't have time to do it now, but if it is too complicated I'm sure someone will take the time to sketch it out; it may just take a little bit for someone to have time to do it.

    Leave a comment:


  • rpb
    replied
    Same idea on the woofer. Second order low-pass using 1.3mH, and 5.6uf. Then two notches just like the tweeter notch.
    One notch is centered around 1k to shape that area, the other around 5k to hammer that 5k spike in the response.

    Leave a comment:


  • rpb
    replied
    I don't have a good easy way to draw it. Not tonight anyway. You did some sims. The tweeter is a 3rd order. 18uf, .12mH. 36uf. Then there's a notch with the other three values shown They are in series with easch other, and across the tweeter terminals. Two ohm resistor in front of the x-over.,

    Leave a comment:

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