Extension Cabinet for 5E3 Tweed Deluxe: What would you recommend?

Discussion in 'Amps and Cabs' started by iim7v7im7, Dec 20, 2009.

  1. iim7v7im7

    iim7v7im7 Member

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    Hi,

    I had Jim Nicholsen of Li'l Dawg amps build me a D-Lux (5E3) head. I was fortunate enough to outfit with Mercury Magnetics PT/OT and a complete set of NOS 1950s RCA tubes. Peter Mather built me a beautiful pine cabinet (blond tolex, not tweed). I have been using it with my extension cabinet that I use with my Allen Accomplice (AB763).

    Dave Allen's cabinet is 24"W x 18-1/2"Hx 10-1/2"D, pine, open backed, tolexed and has an 8 ohm, 12" Tone Tubby Alnico H1E speaker. I really like this speaker with the Allen, it is full spectrum, compresses when pushed and is very smooth sounding (Had a Eminence R,W&B and Scholz Sugarcone prior to this). This speaker is a bit dark for the 5E3 circuit, especially when playing with humbuckers on the normal (microphone) channel. So I have decided to have a dedicated cabinet built. I am looking for advice.

    My Li'l Dawg D-Lux head is quite small and portable (18"Wx9-1/2"Hx8"D). I want to have a 1 x 12 open backed cabinet built specifically for the amp. In terms speakers, I know that a Weber 12A125 is the typical replacement for an old Jenson, but I am considering a 25W, non-doped 12A150 or 12A150A to have better bass handling (1-1/2 vs. 1-1/4"). These speakers project about 6-3/4" from the inside of a baffle. I am thinking that these speakers will be brighter than my TT.

    I want to keep the cabinet as small and as light as feasable, but not at the expense of tone. So it does not need to be over 18"W to match the head mechanically, but I am not sure acoustically with an open backed cabinet how much X by Y by Z matters? So minimally, I mechanically could have something built say 18"Wx18"Hx10"D. This is smaller than most cabinets. Will I pay an acoustic price by going so small?

    Thanks,

    Bob

    [​IMG]
     
    Last edited: Dec 20, 2009
  2. gkoelling

    gkoelling Member

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    This is a 1x12 cab with an Eminence Black Mountain. The speaker is 30 watts and seemed to add a touch of headroom and volume over the last speaker I used.

    [​IMG]

    I'm real happy with it, it isn't cheap but none of them are.
     
  3. iim7v7im7

    iim7v7im7 Member

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    A 5E3 Tweed Deluxe combo is 20"Wx16"Hx9-1/2"D for reference.

    Some 1x12 open backs that I have found:

    Mojotone GT Small Tweed: 16"Hx14-1/2W"x12"D
    JDesign: 18-1/2"Hx19-1/2"Wx10-1/4"D
    Mesa Boogie: 15-3/4"Hx18-3/4"Wx11"D
    Fender HRD 112: 18"Hx22.5"Wx11"D
    Weber: 15"Hx15"Wx13"D
    Trutone: 18"Hx24"Wx11"D
    Jenkins: 19"Hx25"Wx11"D
    Dr Z:19-1/2"Hx22-3/4Wx10-1/4"D
    Hermida: 16"Hx20-3/4Wx11"D

    So the empirical ranges that I see on the small sample are:

    15" to 19-1/2" High
    14-1/2" to 25" Wide
    9-1/2" to 13" deep

    I am uncertain if size is driven by the commercial desire to large enough to place most amplifier heads on top (width x depth) or by acoustics?
     
  4. KGWagner

    KGWagner Member

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    There are a lot of variables involved, so it's somewhere between difficult and impossible to say. Those examples will use different construction material of different thicknesses assembled with various types of joinery and reinforcements and have a variety of coverings which may use different adhesives. Then, it's a pretty safe bet no two of them use the same speaker, and they're all certainly different amplifiers. The only comparison point is they're all open back speaker enclosures.
     
  5. iim7v7im7

    iim7v7im7 Member

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    I understand, but I find that it is likely that an 18"W x 16-18"H will be acceptable providing plenty of perimter baffle for a 12" speaker. Depth is more of a question. The speaker that I am thinking of is 6-3/4" deep from the baffle so a 10" depth should be more than adequate. I will have a conversation with Peter Mather about this and seee what he says.

     

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