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Speaker Suggestions

Discussion in 'Amps and Cabs [BG]' started by until.tomorrow, Jul 27, 2005.

  1. until.tomorrow

    until.tomorrow Guest

    May 5, 2003
    US - Milwaukee
    I just purchased an unloaded 215 cabinet and needed suggestions for the type of 15’s to equip it with. The dimensions of the cabinet are 40.5” x 22” x 15” (h x w x l). It’s a smaller cabinet so hopefully I’ll have some choice in what kind of sound I want to get.

    I would “like” my sound to be tight low end that will be able to handle D tuning. The head I am using is a Ampeg v4 with a MM Sterling. I’m looking to spend around $250 and I am willing to wait it out (ebay) if necessary. (I have a 412 cabinet currently)

    I can provide more information if needed.

  2. Petebass


    Dec 22, 2002
    QLD Australia
    Ok lets attack the cab size issue first.

    By my calcs, yout cab is about 6.5 cubic feet (185 litres) all up, so 3.25 cu.ft (92.5l) per driver.

    There's lots of 15's that will work in a cab that size. I'll leave you to research the prices, but I'll insert the cab tuning frequency and -3dB point in brackets in that order:-

    Eminence Kappa 15c (31Hz, 75Hz)
    Eminence MCM 55-1125 (53,69)
    Beyma 15G350 (32,73)
    Thruster PE 293-150 (25,84)
    Peavey 1502-DT8(42,67)
    JBL 2234H (23,67)
    Peavey 1501-DT4(47,67)
    Fane Studio 15L (45,64)
    Eminence Kilomax Pro 15(41,49)
    Beyma 15K200 (27,62)
    Peavey 1505KA-DT8 (44,60)

    All of these -3dB points are for one driver only. 2 speakers will produce more lows again, so all of these should be Low D capable. And they're all reasonably efficient speakers so you should be plenty loud.

    The next issue to attack is the cab's porting. Does is have any ports at the moment? If so, what are the dimensions of the port?
  3. until.tomorrow

    until.tomorrow Guest

    May 5, 2003
    US - Milwaukee
    Thank you so much for the help Petebass!!!!

    It is a closed back 215 cabinet. It looks quite aged with a Vox grill cloth (missing the vox logo). I find it hard to believe that it IS a Vox cabinet but who knows. Anyhoo, I don't remember seeing any ports on the front of the cabinet BUT I will let you know on Friday because it is at my practice space. Hope we can continue this then.

    Thanks again!
  4. MJ5150

    MJ5150 Terrific Twister

    Apr 12, 2001
    Olympia, WA
    I put Peavey Black Widows in my old 215 cabinet, and it rocked!

  5. until.tomorrow

    until.tomorrow Guest

    May 5, 2003
    US - Milwaukee
    There isn't any porting on the cabinet. What's the next step from here?
  6. Petebass


    Dec 22, 2002
    QLD Australia
    OK no ports. None of the speakers listed above will work to their full potential in a sealed enclosure, so we're going to have to port it. This isn't such a bad thing because installing porting from scratch is often much easier then trying to adjust existing porting. It should be as easy as buying a round plastic port from partsexpress or somewhere similar and fitting it to the cab. Once we know which speaker we'll be using, we'll calculate the correct diameter and length to achieve the correct cabinet tuning frequency.

    The next step is for you to investigate the availability and prices of the speakers listed above. Some will cost more than you're prepared to pay. Others may not be available in your area. I suggest searching around online at places like partsexpress, US Speakers, Maddisound, or any one of the many retailers of raw drivers. Once you do this, that list of speakers above will most likely shorten and you'll probably start to develop a preference of one or 2 of them. At this point I'll start running some detailed computer simulations and see if we can narrow the choice to one model of speaker.
  7. until.tomorrow

    until.tomorrow Guest

    May 5, 2003
    US - Milwaukee
    I've started a simple search and found most are around $140 but I wont be able to get into it until I get the internet at me house which should happen tomorrow.

    I'll get back with the list of my preferences.
  8. Thor

    Thor Moderator Staff Member Gold Supporting Member

    Madisound is up in Madison WI, Larry Hitch is a good
    contact there. Though you will want to do more
    design research before you contact him, or someone like him.

    But if you intend to be in Madison at some point ANYWAY,
    and know what you want, they are a good company to do
    business with.

    I have checked pricing before at US Speaker and they
    weren't that competitive.

    I did see a JBL 2234 go to a friend of mine from Ebay
    last week for 108.00 ,used, which was a steal.

    If you go the Eminence route, Martin Sound in Cleveland OH
    had excellent prices when I did business with them on
    new drivers. I actually dealt with them thru Low Down Sound
    in Ferndale ( Detroit) area, MI. Ask for Ryan.

    Sounds like a fun project. Enjoy!
  9. watspan


    Nov 25, 2002
    madison, wi
    I work two blocks from his shop and never knew he existed! I think I have my answer as to how to replace my 15's in my Acoustic 106 bottom!
  10. billfitzmaurice

    billfitzmaurice Commercial User

    Sep 15, 2004
    New Hampshire
    Owner, Bill Fitzmaurice Loudspeaker Design
    Maybe, maybe not. Madisound specializes in hi-fi, I don't believe they carry any pro-sound drivers.
  11. Thor

    Thor Moderator Staff Member Gold Supporting Member

    I got a Peerless 831759 from them for a Len Moskowitz 'Compact Bass Speaker' project. ( Speaker Builder Feb 1994, pp. 10-17).

    Depending on what driver is in there, you might want to recone.

    ( Let me know as I have never opened my 106 up,
    and I forget what they were loaded with.)
  12. watspan


    Nov 25, 2002
    madison, wi
    Finally opened up the Acoustic 106 and removed a driver. Here's whats on the magnet:

    13 14
    67 7309

    with 1552 stamped on the cone.

    I know it's an eminence speaker, from their website.

    Does anyone know what would be a direct replacement? Any suggestions on an upgrade from stock?
  13. Thor

    Thor Moderator Staff Member Gold Supporting Member

    Note this page here.


    This is an excellent resource for old Acoustic info.

    The below info is courtesy of Funkengrooven:

    Also, note the 146 rig ( 140+106) is offered below with an
    Altec upgrade in the 1972 catalog.

    I would look for a used JBL K-140 on Ebay. Or a blown one
    and have it reconed to factory specs.

    I have exactly the same bottom, and in your shoes I
    wouldn't hesitate to replace it with a JBL.

  14. Thor

    Thor Moderator Staff Member Gold Supporting Member

    PS, I also got this note from FG ...

  15. until.tomorrow

    until.tomorrow Guest

    May 5, 2003
    US - Milwaukee
    Would Altec 421a speakers sounds nice (or be tuned correctly) to this size of a cabinet?
  16. jerm


    Jul 10, 2005
    Put an EV speaker in it
  17. Petebass


    Dec 22, 2002
    QLD Australia
    It's hard to say. I did a google search on this speaker and it appears to be vintage. The speaker you're being offered are likely to be more than 30 years old.

    I couldn't really get any T/S data either. The best I could come up with was

    This Website.

    Unfortunately, I couldn't get much useful info out of it.
  18. until.tomorrow

    until.tomorrow Guest

    May 5, 2003
    US - Milwaukee
    Would this image help? I found it on Here . It gives a frequency
  19. until.tomorrow

    until.tomorrow Guest

    May 5, 2003
    US - Milwaukee
    This image is terrible due to constraints on attachments BUT the actual image can be found (Image #04) in this Zipped file.

    Ziped File

    The resonant frequency of the 421a is 40hz (the graph shows 39hz)

    Attached Files:

    • 04.
      File size:
      47.3 KB
  20. Thor

    Thor Moderator Staff Member Gold Supporting Member

    The 106 cab was produced from 72 on.

    Thiele/Small published their papers in the early 80's.
    You are really shooting blind on it.

    The JBL K-140 is a solid replacement vintage bass speaker.

    You can buy it for 200 right now just about anyhere. If you haunt Ebay, you can buy it for less. Blown ones that can be reconed to new factory specs are readily available, and people buy them because they are excellent quality construction, cast frame baskets and so forth.

    Like I said, I have this same cab, and would do this in
    a heartbeat.

    Check here:

    JBL K-140

    He's got one for 179.00 plus shipping.

    Take out your credit card.