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Introducing The Arias - my Black Box design. RS150-4 + XT25SC90-04

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  • DinoRhinoDance
    replied
    ​​​​Click image for larger version

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  • DinoRhinoDance
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  • DinoRhinoDance
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  • DinoRhinoDance
    replied
    It's almost been a year since I started this build, but I'm finally finished! Thanks for the reply and posting your write-uptyger23 Mine looks much different since the recipient asked for them to be "stealthy." I've been doing some A/B testing with my desktop setup and have been pleasantly surprised by how well they fair against my CAT 308 and Dynavox LW6004PMR bookshelves. The vocals seem to shine on these and the Peerless tweeter really is a bargain! Great stuff!
    Last edited by DinoRhinoDance; 10-25-2022, 09:42 PM.

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  • tyger23
    replied
    Here is the document that was missing from post #2. This was my full writeup on the project, and it contains most all my thoughts and information taken during the project.

    https://docs.google.com/document/d/1...f=true&sd=true

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  • tyger23
    replied
    All - yeah, I don't post much here anymore. Sorry for dredging this up many months later, but I thought I would answer the questions asked.

    I think most of the information being asked was listed in post#2, which appears to have been a document that's now gone into the internet ether. I'll post that information below. DinoRhinoDance yes - this was 3/4MDF, and the cutlist was on post 1. The bracing and corner slices really don't factor into the calculations much at all. I believe the corner slices were about 1.5" on the 90-degree angle sides. The cross bracing pieces were about 2" or so wide. Something in that realm. The port was 2" PVC, and the total length from the back of the port to the front of the baffle is 6 ¾“.

    I will say that I did prefer the 4-ohm version. They 8-ohm version was good, too. Just make sure your amp can handle 4-ohms if you build that.

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  • Operandi
    replied
    Originally posted by DinoRhinoDance View Post
    I'm eager to build the 8-ohm version of these but I have two questions I'd like to sort out before committing to ordering parts.

    What are the port dimensions?

    Was this made with 3/4" MDF?

    Thanks!
    Just curious, did if you started building these yet?

    Looking at building the 4ohm version myself and am getting close to buying the parts.

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  • DinoRhinoDance
    commented on 's reply
    Thanks for the detective work a4audio. I don't fully trust my own work with WinISD and XSim so I'd like to follow in footsteps for a few more projects before I go solo!

    I just ordered parts for the 4-ohm version after picking out an amp. I'll use the same port tuning from the C-Killa build by the late Lou.

    Thanks for the help!

  • a4eaudio
    replied
    Originally posted by DinoRhinoDance View Post
    I'm eager to build the 8-ohm version of these but I have two questions I'd like to sort out before committing to ordering parts.

    What are the port dimensions?

    Was this made with 3/4" MDF?

    Thanks!
    tyger23 doesn't post a lot of on the forum these days, so I'll take a guess...

    I bet this is 3/4" MDF looking at the pics and that he mentioned using a 1/2" roundover instead of chamferring in post #5.

    You can get the dimensions from the cut-list in post #1 for gross volume. Estimate displacement of driver, port and bracing for net volume. He says he used 2" PVC pipe in post #5 and tuned to 48Hz in post #30. Using WinISD you can get a good approx of what the length of the port would need to be. Box tuning is regardless of the driver, so if you have net volume, tuning and port diameter you'll get port length. If you have the ability to measure the TS parameters on actual woofers, you could modify the box volume if needed, as tyger mentioned he wasn't getting the bass response from the 8 ohm version that he remembered from the 4 ohm version. (Also, RS150 is a popular driver, you could use someone else's design for box volume and tuning and keep tyger's baffle layout and crossover.)

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  • DinoRhinoDance
    replied
    I'm eager to build the 8-ohm version of these but I have two questions I'd like to sort out before committing to ordering parts.

    What are the port dimensions?

    Was this made with 3/4" MDF?

    Thanks!

    Leave a comment:


  • tyger23
    replied
    Re: Introducing The Arias - my Black Box design. RS150-4 + XT25SC90-04

    Just FYI - I always order all my parts from www.erseaudio.com. Even when their website shows "out of stock", I've never had an issue with that. I guess they always find one to send me or perhaps they wind one to spec. Unwinding the 2.5mH coil should work as well, but I don't know how many turns it would require....

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  • Wolf
    replied
    Re: Introducing The Arias - my Black Box design. RS150-4 + XT25SC90-04

    Originally posted by saabracer23 View Post
    I'm trying to source all of the crossover parts from PE. The 8R version uses an iron core 18ga 2.2mH coil. PE stocks an 18ga 2.5mH coil and the DCR Is close. Will that work? I can unwind a few turns to get it to 2.2.

    Dan
    Try a P-core...
    Wolf

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  • saabracer23
    replied
    Re: Introducing The Arias - my Black Box design. RS150-4 + XT25SC90-04

    I'm trying to source all of the crossover parts from PE. The 8R version uses an iron core 18ga 2.2mH coil. PE stocks an 18ga 2.5mH coil and the DCR Is close. Will that work? I can unwind a few turns to get it to 2.2.

    Dan

    Leave a comment:


  • Pete Basel
    replied
    Re: Introducing The Arias - my Black Box design. RS150-4 + XT25SC90-04

    That dip sounds quite good so, you might just be surprised if you were to remove it.

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  • tyger23
    replied
    Re: Introducing The Arias - my Black Box design. RS150-4 + XT25SC90-04

    Pete, I was not specifically targeting that response. I was targeting a good phase response with a deep reverse null, and the result was as pictured.

    I'd love to get those speakers back someday and re-take some of those measurements. I've learned a lot since then and I wouldn't be surprised if the dip was actually measurement related.

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