Ampeg V4 cab for bass

Discussion in 'Amps [BG]' started by johnk_10, Mar 24, 2009.


  1. johnk_10

    johnk_10 vintage bass nut Supporting Member

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    I just finished restoring one of the three early 70's Ampeg V4 (4x12) cabs that i currently own. i started with the one that was in the roughest shape (and i mean rough!). the cabinet itself was structurally sound but on two sides of it, the tolex was completely gone, there were deep gashes in the plywood, and the grill cloth had some large rips in it. i filled all of the imperfections, sanded it smooth and retolexed it in the same manner that Ampeg did them (i.e. one long piece wrapped around the side with a single seam, and a large rectangular piece covering the back). on the inside of the cab, i stapled egg crate foam to the back and sides of the cab. Since i am keeping this one, i installed a neutrik speakon connector to replace the 4 pin cannon jack, and added a rocker switch to make the cab switchable (2 or 8 ohms).

    for this cab's speakers, i chose four new Eminence-neo deltalite 2512's, for several reasons. first, i like the sound of them. second, they are very light-weight, at around 5 lbs each. third, they handle alot of power (250 watts each) making it a 1000watt cab), fourth they are pretty efficient 99.9db @ 1w/1m), and fifth, i get them wholesale ;). to give them just a tiny bit more high end, i removed their paper dust caps and replaced them with aluminum JBL ones. To me, this gives them just a little more sparkle and detail without having to boost the amps' high end ( & i've always been a big fan of D and K series jirbles).

    After plugging one of my SVT heads into it with one of my p basses, i was blown away. i don't know why the cab is so efficient, but i'm running the volume's gain at a little more than half of where i run it with my SVT610HLF or 8x10 SVT cabs. this makes for ALOT of available headroom. it has a ton of low end as well as a ton midrange punch.

    with most of my previous and current cabs having multiple 10's, two 15's, one 18, or two twelves i forgot just how nice FOUR twelves can sound in a sealed cab. in the mid 70's i used to use two Sunn coliseum 4x12 cabs, but that was with a solid state Sunn Coliseum bass head which i found those heads to be too sterile sounding (for my taste) as well as it being a lonnnnnnng time ago.

    anywhoo, here's a pic of the cab with my VR head. I'm going to use this configuration at this weekend's gig. (i'll be regrilling it tomorrow). BTW, the feetcups on the top of the cab not only line up perfectly with my old V4 heads, the new VR fits into them perfectly as well.

    [​IMG]
     
  2. JimmyM

    JimmyM Supporting Member

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    Ampeg porn is good porn! Really interested in this because of the modded neos. I'd like to hear your gig impressions of it.
     
  3. johnk_10

    johnk_10 vintage bass nut Supporting Member

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    yeah, and i'll have alot of ampeg porn pics to show in a week or so. i'm going to try and fit all of my ampegs in the living room for a group photo.

    my gig is this friday night so i'll post my impression of the cab's performance in a real live band situation, but i can already tell that i'm going to love it. i've used an SVT610HLF, two 2x10's and a 2x12 at the same club on different occasions, so at least i have something to compare it to. of the previous cabs that i used there, the 610 was the best, then the two 4x10's, but i have a gut feeling that this 4x12 is gonna be the best of all.
     
  4. demon666

    demon666

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    Nice. Now you just need to finish up another one so you can stack 'em:D
     
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  6. johnk_10

    johnk_10 vintage bass nut Supporting Member

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    or finish the other two and stack 'em three high.:eek:
     
  7. davelowell2

    davelowell2 Uhh... FaFaFooey is BaBaBooey... Supporting Member

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    I've wanted to do this for a long time! Please report back. Any idea on weight for that thing?

    Dave
     
  8. Bassmec

    Bassmec

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    I bet thats the sort of cab that makes getting a decent microphone out really worth while. The answer to the bass pod right there!.
    Well done!, love the Ally voice coil caps idea looks stunning and on axis
    my old JBL K120's made my strings sound about 4 gigs newer.
    I still have them but they are in floor monitors now:
    [​IMG]
     
  9. Chuck King

    Chuck King Supporting Member

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    I am glad to see that you put actual bass speakers in it---I was worried when I saw this thread title because I had visions of somebody shredding the old speakers in a V4 cab by playing bass through guitar speakers. But you did it right. I have a V4 cab and it has great bass response for a guitar cab. I'm sure with bass speakers it would be great. I don't know what it is about those cabinets that makes them sound so incredible, but I haven't heard a better sounding 4x12.
     
  10. karter2000

    karter2000

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    I have one of those cabs as well (came with my V4) and I think it sounds pretty good as well (even with the old CTS speakers). Like the previous poster said, I don't want to use it with the old CTS speakers, so I'm looking at doing something similar.

    The Eminence-neo deltalite 2512's are 8ohms each, correct? I would also be interested in how you wired it, ie the 2/8 ohm switch and neutrik connector.

    Lyle
     
  11. johnk_10

    johnk_10 vintage bass nut Supporting Member

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    yeah, i think that i would blow the original speakers easily with an SVT. i'm sure you could get away with it using the stock speakers if you used two cabs (eight 12's!). its funny, i have heard others say (both in person and on other forums) how great these cabs are for guitar or bass. the funny thing is, looking inside it, it doesn't appear to have anything special about it, other than it being very well built and braced.

    and yes, they are 8 ohm speakers. i'll post a diagram of the wiring.

    i'll also weight with the neos as i'm curious as to how much it weighs now.
     
  12. johnk_10

    johnk_10 vintage bass nut Supporting Member

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    Here's a pic of the back of the cabinet showing the speakon jack and the 8ohms/2ohms switch ( i inlaid them so they wouldn't get damaged if the cab was loadded on its back):

    [​IMG]

    and here's a wiring diagram that i quickly drew up for it:

    [​IMG]

    I also weighed the cab and it weighs 74 lbs which, to me, isn't all that bad for such a large cab.
     
  13. karter2000

    karter2000

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    Thank you very much for the diagram!

    Sorry for all the questions, but what type of DPDT switch did you use?

    Thanks,


    Lyle
     
  14. johnk_10

    johnk_10 vintage bass nut Supporting Member

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    i used this one that i got at radio shack:

    http://www.radioshack.com/product/index.jsp?productId=2062525

    i generally don't use "rat-shack" parts, but this particular switch is made pretty well and has a low profile. i also used one of them on my SVT610HLF so i could bypass the x-over and horn completely if i want to.
     
  15. megadan

    megadan

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    Really nice John! Hope to hear some clips or a gig review.
     
  16. kraigo

    kraigo

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    What are the external dimensions of the V4 cab?

    That looks really cool and is a little too GAS inducing.

    KO
     
  17. johnk_10

    johnk_10 vintage bass nut Supporting Member

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    the cab's dims are: 30" H x 27" W x 14" D
     
  18. johnk_10

    johnk_10 vintage bass nut Supporting Member

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    btw, i regrilled it yesterday. here's a pic of it :

    [​IMG]

    i've been playing/testing the cab a bit more and i just can't get over how good it sounds & i'm really glad that i built it up this way. and since its lower, its ALOT easier to lift the head up onto it than my 610 and 810 cabs.
     
  19. notforrobots

    notforrobots

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  20. kraigo

    kraigo

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    Where did you find the aluminum JBL dust caps? I have a sealed 4x10 with Jensen Mod 10's in it. It needs some high end, but I don't want to hook the horn back up in the cab...

    KO
     
  21. Whaaaapsh

    Whaaaapsh

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    Despite the abuse I probably dealt it, I practiced with a V4 + the guitar cab for a while and it sounded great. Non only that, but the cab size is nice and proportional to the wide 70's V4's head size (26.5"). My V4 always looks like a bit of a bobble head on my modern-sized 24" cabs.

    I've been toying with this same idea, although I can't justify it because I couldn't cram it all in my car if I needed to gig! Nice to see someone livin' the dream :bassist::bassist:!
     

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