1. Please take 30 seconds to register your free account to remove most ads, post topics, make friends, earn reward points at our store, and more!  

Two 4 ohms in series Vs two 16 Ohms in parallel

Discussion in 'Amps and Cabs [BG]' started by LowGrowl, Jul 14, 2014.


  1. LowGrowl

    LowGrowl

    Jan 20, 2011
    Mexico City
    Talking about the same drivers in the same properly tuned enclosure:

    Is there any difference in tone using 2 of the 4 ohms version wired in series Vs 2 16 ohm wired in parallel?

    Haven't found anything about that.
    Any thoughts or experiences?

    Ray
     
  2. I think you should also take in to account that the other T/S specs may shift as your impedance changes. Means the pairs of drivers may not be swap-able in what ever cab is built around them.
     
    LowGrowl likes this.
  3. RoadRanger

    RoadRanger Supporting Member

    Feb 18, 2004
    NE CT
    One advantage of two 4 ohm in series is that if one burns out the other will quit too and not try to drive a now mistuned cab - thus over excurting and ruining it too.
     
  4. will33

    will33

    May 22, 2006
    austin,tx
    The 4 and 16 ohm versions of the "same" driver won't be exactly the same. Changing the voice coil will affect other parameters as well, though they can make tweaks to the design to give the two a similar tone.

    Electrically, the impedance will end up the same. In the series connection, if one driver blows, it's mate can lose signal/stop playing as well, leaving no load (not good for tube amps). In the parallel connection, if one blows, the other will still play/present some load to the amp.
     
    CL400Peavey likes this.
  5. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa, Product Support-Genz Benz
    In general, and assuming "identical" TS parameters, there would not be any performance differences as the motors see exactly the same electrical parameters and function effectively as a single motor of 8 ohms.

    In practice, there will be some differences in TS parameters no matter how hard we try to make them identical.

    RR makes a good point regarding driver failure, applied mainly to guys driving beyond the rig's safe limits.
     
    CL400Peavey likes this.
  6. LowGrowl

    LowGrowl

    Jan 20, 2011
    Mexico City
    Yes, there are differences!
    Fortunately the guys at Faital-Pro have a very nicely setup website.

    Take a look at this:
    CompTS_zps149feb53.
     
  7. RoadRanger

    RoadRanger Supporting Member

    Feb 18, 2004
    NE CT
    Good point, an SVT cab (meant for a tube amp) has ALL the drivers in parallel - eight 32 ohm drivers = 4 ohms :) .
     
  8. RoadRanger

    RoadRanger Supporting Member

    Feb 18, 2004
    NE CT
    In today's world with stoopid big bass amps driving small, light cabs that seems to be common :( .
     
  9. basscooker

    basscooker Commercial User

    Apr 11, 2010
    cincy ky
    Owner, ChopShopAmps
    Yeah, as stated the TS numbers really won't be the same. I've been working on offering a 2x12 in 4 or 8 ohms, and the cabs model very differently with "the same" driver.
     
  10. Right so it isnt apples to apples. The pro's and cons to each driver would depend on which cab each was loaded in to.
     
  11. mrmills

    mrmills

    Jun 22, 2009
    Kent, UK
    Yes there will be differences, some important, some not. Most important is the fact the TS specs will be different but this has been mentioned more than once.

    Lest assume you can find a 4ohm speaker that is identical to a 16ohm speaker in its TS specs (except for voice coil resistance) to keep things simple. As speakers are not ideal loads (i.e. only resistive), we would need to think about the capacitive and inductive nature of the speakers. Like with pickups, two parallel speakers will double the capacitance but half the inductance. This will change how the parallel speakers will sound compared to the series speakers.
     
  12. will33

    will33

    May 22, 2006
    austin,tx

    I've been eyeballing Faitals little 10FE200 for a couple uses, but the 4 and 8 ohm versions are so different that one wants a sealed cab and the other wants ported. :|
     
  13. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa, Product Support-Genz Benz
    While it might seem like L & C differences are large, in fact not so much when you look at the ratio of L & C to the DCR and nominal impedance curves.
     
  14. LowGrowl

    LowGrowl

    Jan 20, 2011
    Mexico City
    Hi!
    Yesterday night I made a very quick check with bass box pro and unibox.
    The two versions model quite differently!
    The 4 ohms version is better suited for a small hight output cab with a very wide boost in the mids (300hz to 800 hz). Definitely not what I want.

    The 16 ohms version on the other side goes flat all the way down to 50hz in a 110L cab. No problems with excursion or vent air with 1000 watts. Impressive!

    Too bad it's not in stock anywhere!

    So, do you know any other good candidate (4 or 16 Ohms) to make this 2x12 @ 8 ohm bass cabinet possible?

    Thank you very much!!
    Ray
     

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.