Announcement

Collapse
No announcement yet.

Filter help forTechtonic Elements 3.5" in single driver speaker, please.

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Chris Roemer
    replied
    Yup. John's showing you a more exact substitution for what rpb suggests.
    Using more common values, a 22uF cap matches pretty well w/a 0.50mH coil (and a slightly smaller resistor - but keeping the 25n is NOT far enough off to worry about ).

    If I were you though (and it SEEMs like you're using npe caps), just parallel a 22uF w/a 4.7uF (and keep the orig. coil & resistor). Easy, and cheap !

    Leave a comment:


  • jhollander
    replied
    I'm using Xsim for my x-o work

    Leave a comment:


  • rpb
    replied
    For notch filters, you can make the cap 10% bigger, and coil 10% smaller, and it should do about the same thing. (Or bigger coil, and smaller cap.)The other option is to parallel two caps to get the value needed. They simply add. Keep in mind that caps sometimes have 20% tolerances. If you have a coil that needs to be smaller, you can unwind a few turns.

    Leave a comment:


  • mmu7
    replied
    Since I can't find a 27uF capacitor on parts-express, the nearest values are a 33uF and a 22uF. How would these modify the inductor value? I'm guessing the 33uF is the safest since it'll notch it down slightly lower, rather than higher and potential interfere with the existing null in the frequency response.

    jhollander did you use a formula I could use to change things up ? I found https://www.diyaudioandvideo.com/Cal...chFilter/Help/ but the values you used don't adhere to the calculation there.

    Leave a comment:


  • jhollander
    replied
    The difference is due to the actual driver measurement on the baffle.

    Leave a comment:


  • mmu7
    replied
    Originally posted by jhollander View Post
    Here's the FR without the notch, with .3 mH on baffle compared to with the notch and .3mH.

    When I tried your filter with the response provided by Tectonic through an SPL trace the filter was adding to the dip. Is this due to measurement difference and theoretical driver response?




    Click image for larger version

Name:	Annotation 2020-07-21 130635.png
Views:	210
Size:	277.1 KB
ID:	1446537

    Leave a comment:


  • jhollander
    replied
    Here's the FR without the notch, with .3 mH on baffle compared to with the notch and .3mH.

    Leave a comment:


  • 3rutu5
    replied
    I actually like it. Used it on a few occasions, but honestly my ears arent as tuned as most as i'm a visitor in this realm....Chris gave me some great advice on a BSC which in my opinion took the drivers to the next level.

    http://techtalk.parts-express.com/fo...or-pc-speakers

    back then i didnt go a cross over and tweeter as i was a bit afraid of the concept, but would consider it now or next time i go for some small desktop speakers.

    I'll be interested in what comes out of your research Drjay

    Leave a comment:


  • mmu7
    replied
    Also do you think I could get away without the notch and just the 0.3 mH inductor that roll of the highs

    Leave a comment:


  • djg
    replied
    tyger23 used it in the Mariposas.

    I swear someone made a speaker using 4 of these stacked like a little desktop line array, but I haven't been able to find it.

    http://techtalk.parts-express.com/fo...fa-hibm65c20-8

    Leave a comment:


  • Drjay
    replied
    Reporting back with listening impressions. First of all, there is a substantial improvement over the unfiltered version by implementing the filter suggested by John H. above. Sound is significantly smoother and instrumental tonalities more accurate. Using the filter, I feel that this is probably a better overall single driver speaker in about 5L than anything else I hve built. The main reason is because of the bass range which is deeper and cleaner than the TB W4 1320, Dayton PS95, Peerless TC 9 FD, and HiVi B3n, all which I have tried in a single driver format. If you are looking for a very simple to build single driver speaker with very good bass for its size and a decent midrange it woulld be a viable option.
    However, when I compared it to my Duane Brown Deluxe speakers it was no contest. While the TE 3.5 was decent, the DB 4 had a lot more "air", detail and transparency and just as much extention on the low end. One other comparison I made was the TE 3.5 vs. my old, restored, Polk mini-monitor which was considered a pretty decent commercial speaker back in the day. The TE not only had a much nicer measured FR, but sounded clearly better overall, so don't get the impression that it doesn't sound pretty decent, it is just that it doesn't measure up when compared to a very nice, highly affordable, DIY 2 way.
    I am going to pull my Pico Neos out of storage and am finishing up some Redeyes (a MLTL single driver speaker using the Aura NS3) soon and will do a shootout with them also, but that's all for now.

    Best,
    Jay

    Leave a comment:


  • Drjay
    replied
    WOW! Thanks a bunch John. The FR looks MUCH better. Listening starts tomorrow and I'll get back with impressions after I've listened to a pair of them for a few days.

    Thanks again,
    Jay

    Leave a comment:


  • jhollander
    replied
    try this

    Leave a comment:


  • Drjay
    replied
    I knew about John's project using the BMR 3.5 as a mid-woofer. This made me hopeful that the BMR 3.5 inch had potential to be used by itself in a single driver, extended range speaker with no tweeter, but just an in line filter to provide some BSC and correct its 12 db dip from 1700Hz to 1800Hz and its gradual10 db rise from 2K to 10 K. That is what I'm hoping to get some help with.
    I'm pretty sure that it would be a complex filter since it would need to provide at least some BSC and shelf filtering of the 2 to 10K band.
    I think that the deep1700 to 1800 Hz dip is a function of some kind of inherent diaphram characteristic. In a discussion with John quite a while ago, he said that it was basically inaudible in his BMR- 3L design, so I'm not necessarily looking for a filter that would address that. Does anyone have any suggestions for a starting point for a filter that would address the needed BSC and 10 db rise from 2K to 10K?
    Thanks!
    Jay

    Leave a comment:


  • PWR RYD
    replied
    This was a very nice sounding little pair of speakers. John brought them to Iowa a couple years ago.

    Leave a comment:

Working...
X