Problems with my cab, show in 2 weeks

Discussion in 'Amps and Cabs [BG]' started by Darkwulf77, Jul 17, 2013.

  1. Darkwulf77


    Aug 26, 2012
    Hello, recently i blew a voice coil in one of the speakers in my acoustic 400w cab. (Its paired with a 600w head, acoustic brand.) All stock b410 100w 8ohm speakers. Looking online everyone said to go to Guitar center for a replacement. Well when i went they called Acoustic, and they said they cant send a replacement speaker. So the guy told me to just get one aftermarket. Well looking at speakers they have for 8 ohm bass, it was a fender 100 8ohm for 110 or a eminence legend 200w 8ohm. I asked him if there would be any problems hooking up the 200w, he said no. So i got it, just plugged it in today, now everything sounds off, i'll start to play up on the 8th fret and i get a really bad sound like its hitting something. (From all speakers BUT the eminence.) CHecking inside theres nothing that it could hit, and also, its to big to put the screen back over it. Please give me some advice on what i should do now. I really need this cab. (And not much money in my pocket, actually owe people money for this)
  2. P Town

    P Town

    Dec 7, 2011
    It is not a good idea to randomly select a replacement speaker for a cabinet.

    Speakers can be rebuilt.

    In my area, (Milwaukee, Wisconsin), there are at least two, or three people who do this work.
    If you can't find someone nearby, there are places who do it where you send the speaker to them, and they mail it back to you.
    It takes some skill, and knowledge, but you can buy rebuild kits, and do it yourself, as well.
  3. Floyd Eye

    Floyd Eye Inactive

    Feb 21, 2010
    St. Louis
    Borrow a cab for the gig.

    Quit throwing money at what is really a POS to begin with.

    Don't mean to sound like a ****, but the fact is that neither your head nor cab are worth spending one more penny on. Save up and get something better.
  4. Unfortunately, you took the advice of someone who did not know what they are talking about.

    You CANNOT just put another 10" speaker in there, it needs to match the other 3 exactly or you get what is happening to you right now. It can even get worse and cause damage to the other 3 remaining original speakers.
  5. Fat Steve

    Fat Steve The poodle bites, the poodle chews it.

    Out of curiosity, what is the science behind this? I'm genuinely interested.
  6. Floyd Eye

    Floyd Eye Inactive

    Feb 21, 2010
    St. Louis
    Difference in impedance and/or wattage ratings. And as we all know, speakers work best in the cabinets that are designed for them.
  7. Return the speaker, if you can, so you're not out the $.
    I'd borrow someone else's entire rig if you can. That way you don't take your 600 W amp and blow their cabinet and make things worse for yourself. Another idea is to place an ad for the exact speaker you're looking for to buy it used. Another idea: rent a speaker cab.
    Good luck.
  8. Fat Steve

    Fat Steve The poodle bites, the poodle chews it.

    I get that, but even if it's a generic manufacturer with the same wattage and ohms ratings? It seems like if the speaker will fit, is very similar in construction, and all the numbers line up regarding wattage and ohm ratings, it should work. Is this a case of optimum performance/gear snobbery, or is this actually a potentially damaging combo?
  9. The wattage and impedance are two of the least important specs when determining if a speaker works with a particular cab.
  10. Floyd Eye

    Floyd Eye Inactive

    Feb 21, 2010
    St. Louis
    If impedance and wattage match I doubt if it will damage anything. It may not sound very good. Then again it may sound fine. It's a crapshoot. Looks like the one the OP got isn't matching up too well.
  11. Floyd Eye

    Floyd Eye Inactive

    Feb 21, 2010
    St. Louis
    Unless you are speaking about potential damage to the remaining speakers.
  12. Of all the specs that determine how a speaker will work and sound in a particular cab, the wattage and impedance are the least important.

    Since the speakers are operating in the same open cab environment, HOW they work to produce sound can interfere with each other.
  13. Floyd Eye

    Floyd Eye Inactive

    Feb 21, 2010
    St. Louis

    Again, unless we are discussing potential damage to the remaining speakers and/or the amp.
  14. agreed re posts to not mix your drivers (crapshoot) and that you shouldn't invest any further in that cab.

    From my own experience and that of others I've spoken with or heard playing if you're looking for low cost but decent quality/sounding 4-10s go for a used Peavey TVX410 or SWR Workingman 410T. Can be had for under $200.
  15. Darkwulf77


    Aug 26, 2012
    The speaker matches with everything except what its rated for. The 3 other speakers will put out 100w as the new one will put out 200w. That's why i thought it would work. (I only push out maybe 300w max.) Could it be with how i wired it messing the others up? It seems to all be connected like a circuit. When i pulled out the broken speaker none of the other speakers worked, so maybe i just hooked it up wrong?
  16. No, it is not..............

    See my post above to learn about the specs of a speaker that matter.

    Not all 10" 8ohm, 100w rated speaker SOUND the same. The way they actually WORK to make the sound can be in harmony, or can be destructive.
  17. A big +1 if you really want to know. If you are looking for a fast and dirty answer, that one new different speaker reacts differently than the other three. It can cause the other three to be mechanically over-driven when sharing the same cabinet air space. You can't just throw a different speaker in a multi speaker cab. The cab was built to match the speakers that it came with. You don't buy a speaker to "fit a box", you build a box to fit the speaker's operating parameters.

  18. Did you hook it up exactly like it was before ?

    If not, you could have polarity reversed on one or more speakers which will cause bad sound.

    What is more troubling though is that you say with one speaker removed, NONE of the others worked - that is a problem.

    An 8 ohm 4X10 cab, loaded with 8 ohm speakers are wired series/parallel to achieve the total 8 ohm load. With only one speaker removed, two other speakers should still be working. To have no speakers working sounds like at least one other speaker is toast (or you completely changed the cabs wiring).
  19. Example of the info necessary to match up an existing speaker Specifications:

    Nominal Basket Diameter: 15"/381mm
    Impedance: 4 ohms
    RMS Power Rating: 300 Watts
    Frequency Response: 52Hz-2.5kHz
    Sensitivity: 98dB SPL
    Voice Coil Diameter: 2.5"/63.5mm
    Net Weight: 5.7lbs./2.6kg.
    Shipping Weight: 8.6 lb./3.9 kg
    Rec. Enclosure Volume (Sealed): 1.6-2.9 cu.ft./45-82 Liters
    Rec. Enclosure Volume (Vented): 3.0-4.2 cu.ft./85-119 Liters

    Thiele & Small Parameters
    Resonant Frequency (fs): 38Hz
    DC Resistance (Re): 3.72
    Coil Inductance (Le): 0.39mH
    Mechanical Q (Qms): 4.7
    Electromagnetic Q (Qes): 0.5
    Total Q (Qts): 0.45
    Compliance Equivalent Volume (Vas): 260 liters/9.2 cu. ft.
    Peak Diaphragm Displacement Volume (Vd): 381cc
    Mechanical Compliance of Suspension (Cms): 0.26mm/N
    BL Product (BL): 11.1 T-M
    Diaphragm Mass inc. Airload (Mms): 70 grams
    Efficiency Bandwidth Product (EBP): 76
    Maximum Linear Excursion (Xmax): 4.5mm
    Surface Area of Cone (Sd): 856cm2
    Maximum Mechanical Limit (Xlim): 8.5mm