Announcement

Collapse
No announcement yet.

Jims 3 way speaker build

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

  • jimbones
    replied
    no I meant schematic wise would it just be a series resistor after the coil?? or parallel

    Leave a comment:


  • rpb
    replied
    This coil, or something similar.

    https://www.parts-express.com/Dayton...856?quantity=1

    Leave a comment:


  • jimbones
    replied
    rpb what would that look like a 9 mh and 2 ohm resistor?? I assume were talking pretty hi power resistor like 40-50 watt??

    Leave a comment:


  • rpb
    commented on 's reply
    You can do a shelf with the x-over. Remove some padding, and use a 9mH 2 ohm coil on the woofer.

  • jimbones
    commented on 's reply
    rpb DSP only in roon when streaming, sounds way better reduced by 3.5 db. Yes I will be doing a complete set of measurements, zma, each driver separately and together and I want to learn about impulse response as well. absolutely check phase.

  • rpb
    commented on 's reply
    If the mid wiring was changed, you should again check for proper polarity.

  • rpb
    commented on 's reply
    You reduced the bass with the DSP?

  • jimbones
    replied
    Update: Good news for once lol. I had a wiring error in the mid section of the XO. Fixed it and of course makes a world of difference when the wiring is correct. Second I looked up some guides to speaker placement and there was "some" improvement as I moved the speakers 6 feet of the front wall and 4 feet of the side walls. It beings the speakers only 6 ft apart and then had to move the listening position in as well. Third, I use Roon for streaming. It has a built in DSP function so I put in a bass shelf 375hz and down -3.5db. That really helped. I adjusted the subs so they only contribute from 45hz and down. Now I can make minor tweaks as they will be meaningful with the XO wired correctly. Thanks for all the help I will publish the XO as it changes. The only issue is I dont only stream and I play vinyl, CD and play YouTube concerts from my large screen TV connected via Toslink to my DAC. So those wont have a DSP.
    The only way I see around this is to put in my Mini dsp 2x4 for the woofer only and get another amp so I will BiAmp. But I dont want the mid/Twt going theoug the Mini dsp as it doesnt have the best clarity so I can go passive on the upper section. Thoughts??

    Leave a comment:


  • DeZZar
    replied
    Originally posted by jimbones View Post
    OK so lets say I wanted more "Pop" out of it. would I have to tune higher say 40 hz? I'm not getting down to 30 anyway.....
    Previously I had an Eminence BP102 in a sealed cabinet and that had pop but it didnt go low but sounded better. Now that I know the tuning is not wrong here I just want to see how tuning will affect the sound characteristics​
    Your tuning is under 30hz - from eyeballing it I'd say more around 28hz. Not a big deal but here is an indication of how that models - 28hz tuning in blue.

    Green is ideal, 32hz tuning - giving the deepest f3 and flattest magnitude.

    If you start doing silly things like tuning all the way up at 40hz you end up with the third line there - a narrow peak that will likely boom and not sound great. End up with a sort of 'one note' system.

    Click image for larger version  Name:	image.png Views:	0 Size:	29.5 KB ID:	1494064

    Leave a comment:


  • DeZZar
    commented on 's reply
    Can we get the FRD files for these?

  • jimbones
    replied
    here are the port and woofer with a 3rd order XO
    Attached Files

    Leave a comment:


  • jimbones
    commented on 's reply
    rpb the reason you see the 500hz bump is I was operating the woofer full range. Im pretty sure it goes away when I have the XO in place. Ok so yea my in room response is seeing a lot of output between 65 and 85 hz. Thanks so much for your input Im getting an education.Cant thank you guys enough

  • rpb
    commented on 's reply
    It's likely very room dependent, but I like to tune low. Real low. I'd rather pick up 5dB at 25hz, if I can, and loose some of the 50hz and higher.

    If you look at the woofer transfer function in your sims, you will see a peak below 100hz. This makes 80hz a lot louder than 30hz. You can remedy that in the x-over Also, the port resonance at 500hz could use some attention. I think it was 4thtry that did something unique with the ports on one of his speakers, where he tuned out the resonance. If you don't hear this resonance, then don't bother .

  • jimbones
    commented on 's reply
    OK so lets say I wanted more "Pop" out of it. would I have to tune higher say 40 hz? I'm not getting down to 30 anyway.....
    Previously I had an Eminence BP102 in a sealed cabinet and that had pop but it didnt go low but sounded better. Now that I know the tuning is not wrong here I just want to see how tuning will affect the sound characteristics

  • johnny5jz
    commented on 's reply
    This looks so much better now.
Working...
X