General Speaker Advice and Recommendations

Discussion in 'Speakers' started by shotgunshane, Mar 7, 2017.

  1. Hrodulf

    Hrodulf Prohibited from acting as an MOT until year 2050

    Friend
    Joined:
    Sep 28, 2015
    Likes Received:
    3,751
    Trophy Points:
    113
    It's incredibly hard if not downright impossible to physically do anything for these super low frequencies. My approach has always been about smart positioning to avoid true nulls and then iron out the peak electronically. Even our huge soviet anechoic chamber with 1m long rockwool spikes is rated to circa 50Hz or so.
     
    • Like / Agree Like / Agree x 6
    • List
  2. Sunflower_sutra

    Sunflower_sutra Acquaintance

    Joined:
    Mar 13, 2018
    Likes Received:
    50
    Trophy Points:
    18
    Location:
    London
  3. GoodEnoughGear

    GoodEnoughGear Evil Dr. Shultz‎

    Friend
    Joined:
    Oct 25, 2015
    Likes Received:
    2,702
    Trophy Points:
    113
    Location:
    Cape Town, South Africa
    I looked at subwoofer distortion specs...and no-one really publishes them (suspiciously). Then I found this article: https://hometheaterreview.com/why-subwoofer-distortion-is-different-from-amplifier-distortion/ relative to which the 7050B is no slouch at all. I guess I'll put my fomo away again :).

    I am impressed that Genelec actually steps up and publishes their spec.
     
  4. mitochondrium

    mitochondrium Friend

    Friend
    Joined:
    Sep 1, 2017
    Likes Received:
    830
    Trophy Points:
    93
    Location:
    A Cell
    One more reason to buy pro stuff, the documentation which comes with these products is much better than for the typical HiFi stuff. I wonder whether some of the HiFi brands even know the directivity of their speakers and are therefore able to be specific about minimum and maximum listening distance.
     
  5. Cakecake

    Cakecake Guest

    May I join the cool BWC too?

    PAP Trio 15 owner here, although not DIY
     
  6. Senorx12562

    Senorx12562 Case of the mondays

    Friend
    Joined:
    Oct 26, 2015
    Likes Received:
    3,068
    Trophy Points:
    113
    Location:
    Limbo
    My membership in the EWC precludes membership in the BWC.
     
  7. Azimuth

    Azimuth FKA rtaylor76, Friend

    Friend
    Joined:
    Nov 9, 2015
    Likes Received:
    3,624
    Trophy Points:
    113
    Location:
    Nashville, TN
    Home Page:
    I use two 10" sealed powered subs in a stereo configuration. Running this way let's the sub amp and subs do all the heavy lifting without much distortion. The subs are barely at 9'oclock on the gain knob, and that is almost too much bass in my large bonus room.

    Top end is handeled by KEF Q300's. Although, whenever I get my garage setup in my New house, I'd like to build the DIYSG HTM-10's. Although in my setup, I still wish they had the Fusion 8's. Either way, those efficient big mid drivers would be a good match for use with active stereo subs.

    Has anyone built any kits from DIYSG?
     
  8. briskly

    briskly Friend

    Friend
    Joined:
    Oct 3, 2015
    Likes Received:
    59
    Trophy Points:
    18
    Location:
    New York
    Size influences the frequency of the standing modes on the cone, also called break up modes. The geometry of the cone diaphragm and material will affect the particular frequencies of those modes, and the damping of cone material will determine how problematic or helpful they may be. The cone shape implicates high-frequency roll-off, which may be partially countered by the non-rigid motion of the cone.
    There is also the lossy inductance in the motor that serves to slope off the high frequency response.
     
    • Like / Agree Like / Agree x 2
    • List
  9. Priidik

    Priidik MOT: Estelon

    Friend BWC
    Joined:
    Sep 27, 2015
    Likes Received:
    1,824
    Trophy Points:
    93
    Location:
    Estonia
    Curious way to say about inductance. How is it defined?
    VC inductance (reactive) + VC series resistance acts like low pass filter, though.
     
  10. Priidik

    Priidik MOT: Estelon

    Friend BWC
    Joined:
    Sep 27, 2015
    Likes Received:
    1,824
    Trophy Points:
    93
    Location:
    Estonia
    Ehh, you buy some old factory building and suspend your listening room (with soft walls) in the middle of it.
    Kinda like Noisia did, but they didn't really go balls to the wall (too close to the floor).
     
    • Like / Agree Like / Agree x 1
    • List
  11. briskly

    briskly Friend

    Friend
    Joined:
    Oct 3, 2015
    Likes Received:
    59
    Trophy Points:
    18
    Location:
    New York
    The inductance itself is frequency dependent. The permeability of iron in the motor drops off at higher frequencies from eddy currents inside.
    As for how to model this, that's the tricky part. The L2R2 model adds to the existing T-S terms an inductor shunted by a parallel resistor. Thorborg's model used by Scan-Speak adds a fractional order term, semi-inductance.

    Some reading:

    [1]

    [2]
     
    • Like / Agree Like / Agree x 1
    • List
    Last edited: Jun 21, 2019
  12. mscott58

    mscott58 Friend

    Friend
    Joined:
    Oct 13, 2015
    Likes Received:
    2,142
    Trophy Points:
    113
    Location:
    Philly - Yo
    I used to rock a big-ass Paradigm subwoofer in my 2-channel setup that was the size of a coffee table. Can't remember if it was the 12 or 15", I think it was 12". The finish on it was really nice, so it just barely passed the WAF*...but then we had kids and the paradigm shifted (pun intended) and I was told it had to go. Eventually worked two Sunfire Super-Juniors back into the set-up, but they're little pups compared to that big ol' dog. When it really barked you could rattle paint off the walls. Sigh...


    *Wife Acceptance Factor (for those not used to the term)
     
  13. msommers

    msommers High on Epipens

    Friend
    Joined:
    Nov 6, 2016
    Likes Received:
    2,848
    Trophy Points:
    113
    Location:
    Calgary, Alberta
    Home Page:
    • Like / Agree Like / Agree x 2
    • List
  14. philipmorgan

    philipmorgan Member of the month

    Friend BWC
    Joined:
    Sep 28, 2015
    Likes Received:
    3,127
    Trophy Points:
    93
    Location:
    In the wind, so to speak (actually, Taos NM)
    Home Page:
    Holy crap the stack of magnets on that midwoofer!
     
    • Like / Agree Like / Agree x 2
    • List
  15. fraggler

    fraggler A Happy & Busy Life

    Friend
    Joined:
    Oct 1, 2015
    Likes Received:
    3,919
    Trophy Points:
    113
    Location:
    Chicago, IL
    Anyone have ideas for cheap, DIY remedies for a cracked surround? The catch is that this is for a set of Audioengine A2s that have a 3"ish "woofer." Think some liquid electrical tape would hold up?
     
  16. yotacowboy

    yotacowboy McRibs Kind of Guy

    Friend
    Joined:
    Feb 23, 2016
    Likes Received:
    5,330
    Trophy Points:
    113
    Location:
    NOVA
    Home Page:
    I've "repaired" some old torn car audio rubber surrounds with a small square of plain electrical tape on the inside and outside of the surround. didn't seem to make any funny noises, but i definitely wasn't doing much critical listening with them.
     
    • Like / Agree Like / Agree x 1
    • List
  17. Armaegis

    Armaegis Friend

    Friend BWC
    Joined:
    Sep 27, 2015
    Likes Received:
    4,654
    Trophy Points:
    113
    Location:
    Winnipeg
    @fraggler Is it a foam or rubber surround? If rubber, maybe one of those cheap bike tube repair kits that you can stick on? If foam... maybe some contact cement or rubber epoxy? Also of note is now the crack happened in the first place. If it's rot, the patch may be very temporary.
     
    • Like / Agree Like / Agree x 1
    • List
  18. fraggler

    fraggler A Happy & Busy Life

    Friend
    Joined:
    Oct 1, 2015
    Likes Received:
    3,919
    Trophy Points:
    113
    Location:
    Chicago, IL
    Thanks guys. It looks like a thin rubber surround. Speakers are just for the TV in the bedroom, so high fidelity isn't necessary, just tired of the buzzing sound it makes any time they try to make any kind of bass. Only about 5-6 years old, so not sure why it would crack (always in climate controlled area), but then again, these are tiny little things that attempt to defy physics with the bass they do create. May have just watched Lord of the Rings too many times and they gave up.
     
  19. ergopower

    ergopower Friend

    Friend
    Joined:
    Mar 21, 2018
    Likes Received:
    408
    Trophy Points:
    63
    Location:
    South Central PA
    A bicycle tube patch might work very well. Use this one, the patches are very thin and would be a better choice than some of the other brands out there. You can trim the patch down with scissors to the appropriate size before you apply it.
     
    • Like / Agree Like / Agree x 1
    • List
  20. Druid

    Druid Hyperactive Tree

    Contributor
    Joined:
    Dec 26, 2017
    Likes Received:
    91
    Trophy Points:
    18
    Location:
    Portland, OR
    Speaker noob here. I'll be moving into my own house soon and want to start my journey into the world of speakers. I have an EC AF and was thinking of buying a pair of speakers with the appropriate sensitivity to power with my AF. Any recommendations below 2k? Am I better off using the AF as a preamp to a power amp to less sensitive speakers?
     

Share This Page