Help! I don't know how to choose a replacement speaker for a ported/vented cab

Discussion in 'Amps and Cabs [BG]' started by mr80htz, May 27, 2018.

  1. mr80htz


    May 15, 2018
    I know that there are many things to consider, but I have a GK 12" ported/vented cab I picked up for $100 and the speaker in it is dreadful... Very little low end and a lot of treble and it doesn't have any labels. I don't know which models or brands of speaker may be a good choice. I've seen some frequency response stuff but only for Emenence speakers. There's no tweeter and I don't know the model of cab cus it doesn't say and I can't find a pic of it online. It isn't the current low end GK stuff. Suggestions folks??
  2. BadExample


    Jan 21, 2016
    Is that the original or replacement. If replaced or original but damaged, maybe call GK and see if you can get an original replacement.
  3. Mushroo

    Mushroo Guest

    Apr 2, 2007
    Did you try the cab before you bought it? Is it too late to return it?

    I agree with @BadExample that (assuming you decide to keep the cab) your best bet is to get the proper GK replacement speaker.
  4. BadExample


    Jan 21, 2016
    If it is returnable, that might be a pretty good option since you'll be in for a lot more than $100 if you replace the speaker, and there's no guarantee you will like the result.
    AstroSonic likes this.
  5. Rick James

    Rick James Inactive

    Feb 24, 2007
    New Jersey
    Ask Eminence customer service. Be sure to have complete and exact cab measurements.
    /\/\3phist0 likes this.
  6. BadExample


    Jan 21, 2016
    Specifically, need internal dimensions of the cab and internal dimensions of the port(s). Rectangle ports HxWxD, round diameter x depth.
  7. mr80htz


    May 15, 2018
    OK cool. I could call customer service but I just want to throw a good quality speaker that is put into ported cabs already. I am aware that the specs are important but I'm not into it that to a super high degree. I don't know if the speaker in it right now is original or not because there's no info on it but I'm weary to get a GK speaker cus it currently sounds shat. What Emenence 12" are suitable for ported cabs?
  8. You need to decide what you want to accomplish. For example; just get the cab to 'work', maximum volume, fat punchy bass tone, deep pillowy bass, aggressive mids, etc. Any driver that fits in that cab will make sound. To get maximum volume or a particular tone you'll need to tell us what your goals are, and, as others have said, provide interior cab dimensions and porting details (if any).
    BadExample likes this.
  9. BadExample


    Jan 21, 2016
    You could end up with a great speaker that sounds worse if you don't do the measuring. @AstroSonic is really good at picking out speakers for existing cabs. If you absolutely need to get a speaker without measuring, like if you have no thumbs, I'd suggest getting one of those that work in both sealed and vented cabs. If the tuning is totally wacked for the new speaker, you could at least seal the port(s).
    mr80htz and AstroSonic like this.
  10. Eminence Beta 12 is a good 250W budget priced driver, but you need to check the cab dimensions match their specs for vented enclosures. And think about what power handling you need of course.
  11. Fun Size Nick

    Fun Size Nick

    Feb 21, 2006
    London, UK
    It's worth doing a little bit of homework as others have said, because the bad sound that you're trying to fix might actually have been the result of doing exactly what you're talking about and just throwing in a 'good' speaker without finding out if it would work well in that particular cab!
  12. jchrisk1


    Nov 15, 2009
    Northern MI
    Post pics of the cab, and the offensive driver.
  13. BadExample


    Jan 21, 2016
    Also, you might inspect the cone and frame closely for any numbers, if you haven't already. It would be good to know if it's a junk or wrong replacement.
  14. JimChjones


    Aug 6, 2017
    SE England
    There really is no such thing as a good speaker for a ported cabinet. The driver and the box need to match and that's the beginning and end of it.

    A possibly revealing expedient, before you spend any money, would be to simply block the port with a blanket or something and see how it changes the sound.

    Those of a experimental bent might choose to go further and try adjusting the port size to see if they could tune the enclosure to suit the speaker, but you need to be of a nerdy disposition to get into that stuff, and without knowing what the driver is it might not be possible to get a good result anyway, for example if you have a specialist guitar speaker in there a good bass sound is probably unachievable.
  15. two fingers

    two fingers Opinionated blowhard. But not mad about it. Inactive

    Feb 7, 2005
    Eastern NC USA
    You can also measure the inside and cal US Speaker. They will put the dimensions you give them into their software and offer you several ootions based on budget and tone goals.

    But, as other have said, the answer you want doesn't exist. There is no do all good speaker for all ported cabs. There are only crapshoot speakers (meaning it might sound great and it might not) and speakers made for a cab with the dimensions of yours.

    Best of luck with your hunt.
  16. mr80htz


    May 15, 2018
    So after reading all your lovely posts I'm getting the feeling that speakers are not categorized as being for ported/vented cabs? So these cabs are supposed to have an extended bottom end and it wouldn't matter if a speaker, like the Emenence Deltalite II 2512 that has less lower end frequency response (from what the graph on Emenence's website says) wouldn't be a match made in heaven...frequency response-wise?
  17. Bass drivers can be classified as being optimized for either vented or sealed cabs. Some are made to work in both, but are not optimized for either. Ported cabs differ in tuning frequency and internal volume. These are both critical, and are chosen to work with a drivers engineering characteristics (TS parameters). So some drivers that are optimized for ported cabs require larger cab volumes, while others work best in smaller cabs. This choice (cab volume and tuning) also strongly affects the excursion limited power handling.

    So, in order to help you, we need the cab internal volume and dimensions of any ports, your tone goals and your budget.
    BadExample likes this.
  18. BogeyBass

    BogeyBass Inactive

    Sep 14, 2010
    Basslite S2012
    Deltalite II 2512
    Kappalite 3012HO

    Are the usual canidates for 12" fullrange system.
    Sure didn't post it but as long your box is around 1.6 to 2 cubic feet and tuned around 48 to 55hz any those drivers be fine. Its newer GK box so sure its within tolerance of many 12" drivers.

    Keep in mind the thermal ratings will vary with those drivers from 150 to 400 watts. But realistically with typical 4 to 6mm xmax speakers and a single 12 " expect to get 100 to 170 watts of powerhandling before 10% distortion. With a single driver.
    Last edited: May 29, 2018
    mr80htz likes this.
  19. Rick James

    Rick James Inactive

    Feb 24, 2007
    New Jersey
    Some will only work well in sealed cabs, some will only work well in ported cabs, some will work OK, but not great, in either. All will give a different result depending on the cab specifics. That's why there are hundreds of drivers to choose from.
    That's not what it says. Read the fine print. The data sheet chart is with the driver mounted on a 2x2 foot baffle placed in a wall. Below roughly 150 Hz everything changes, depending on the cab it goes into.
    The expertise to successfully do what you want to do takes years of study and practical experience to learn. Why not take advantage of the expert sources you've been pointed to?
    BadExample and AstroSonic like this.
  20. mr80htz


    May 15, 2018
    Thanks for all the posts people. I'm going with the Em. Deltalite 2512 and I'll see how it goes. This is for a backup cab so I'm not into all the effort some have suggested. If it turns out terrible I'll be happy to post it so everyone can say I told you so :)