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What would happen, a question about tubes and cabs

Discussion in 'Amps and Cabs [BG]' started by jazzmonkey, Oct 8, 2010.


  1. jazzmonkey

    jazzmonkey

    Mar 7, 2010
    N.VA
    So if watts are watts, how would an Aggie DB112 handle an Ampeg SVT Classic?
     
  2. JimmyM

    JimmyM

    Apr 11, 2005
    Apopka, FL
    Endorsing: Ampeg Amps, EMG Pickups
    not recommended. the db112 is 8 ohms and you need a 4 or 2 ohm cab rig with an svt cl.
     
  3. ^^

    This, but two of them would probably start to fart out at 12:00 if you didn't bridge the channels.
     
  4. Selta

    Selta

    Feb 6, 2002
    Pacific Northwet
    Total fanboi of: Fractal Audio, AudiKinesis Cabs, Dingwall basses
    :confused:
     
  5. Selta

    Selta

    Feb 6, 2002
    Pacific Northwet
    Total fanboi of: Fractal Audio, AudiKinesis Cabs, Dingwall basses
    He has an SVT-CL, that doesn't apply here.
     
  6. Gotcha... Didn't see that.
     
  7. JimmyM

    JimmyM

    Apr 11, 2005
    Apopka, FL
    Endorsing: Ampeg Amps, EMG Pickups
    i used to do that briefly when i first got my svt working again, but i stopped because i was able to duplicate the sound i like with both channels bridged with a single channel and some eqing.
     
  8. With a Y cable or A/B/Y box or something similar? I'm pretty much doing that now w/ my Blowtorch... Effected signal into one and uneffected into the other. Just was trying to make a point that bridging gives you a bigger tone, which will fart speakers more quickly.
     
  9. JimmyM

    JimmyM

    Apr 11, 2005
    Apopka, FL
    Endorsing: Ampeg Amps, EMG Pickups
    i've done it both ways and didn't think there was much of a difference. i also don't really hear the extra bigness doing it. however, i'm certainly behind those who want to do it, especially if they use effects. back in the day i did clean into 1, effects into 2. i'd do it again if i had effects that required it.
     
  10. So how would an Aggie DB112 or GK Neo112 handle say a 200w Traynor YBA200?
     
  11. JimmyM

    JimmyM

    Apr 11, 2005
    Apopka, FL
    Endorsing: Ampeg Amps, EMG Pickups
    better.
     
  12. Is there a "but...."?

    I guess where I get lost is that I asked a question a while back of how will my (then) new 200w tube amp compare to my 830w SS power/pre amp and I was told that "a watt is a watt", but then in another thread I had asked about bulding a 1x10 or 1x12 isolation box for recording said tube head at moderate volume in my garage and was told that I would need a speaker in the 600-800w range if I didn't want to blow it....
    :confused:
     
  13. staindbass

    staindbass

    Jun 9, 2008
    not all info on the site is correct, (especially mine). you only need a speaker that will handle what you are putting into it.(depending on what you mean by moderate volume). you can run an svt at 8 ohms, it just wont produce full power. probably 150 watts. its ok to go above rated impedance, but not below it. johnny a.
     
  14. jazzmonkey

    jazzmonkey

    Mar 7, 2010
    N.VA
    I don't actually have a tube head, it's just that whenever I think of an all tube bass amp the first thing that comes to mind is SVT CL. I guess I should have asked about an Aggie DB359.

    Interstatejoe has pretty much nailed what I'm getting at. Although watts are watts, it does seem to be the general concensus that tubes sound louder from more harmonics. Doesn't this ultimately push your drivers harder? Would the DB112 paired with the DB359 fart out with the quickness, or would it take it like a champ and be perceivably louder than with my GBMAX 12?
     
  15. Selta

    Selta

    Feb 6, 2002
    Pacific Northwet
    Total fanboi of: Fractal Audio, AudiKinesis Cabs, Dingwall basses
    To be blunt, but it really depends on far too many factors to really give a simple yes/no answer. Gain stages, EQ settings, bass, player, cabs, FX, etc. are all contributing here.
     
  16. billfitzmaurice

    billfitzmaurice Commercial User

    Sep 15, 2004
    New Hampshire
    Owner, Bill Fitzmaurice Loudspeaker Design
    Tubes are comfortable running with the load impedance lower than the tap rating, not higher. With SS it's the other way around.
    No. Tubes can sound louder because of compression, which increases the power density of the signal, but not the voltage swing. As far as blowing drivers is concerned, both electrically and mechanically, that's the result of excess voltage swing. A watt is a watt, so a 200w tube amp and 200w SS amp will have the same voltage swing, so you'll no more blow a cab with SS or tube with amps that have the same voltage swing into the same load, and therefore the same power.
     
  17. I agree that not all info on the site is correct, which is why I asked the question again. Well technically jazzmonkey asked it and I'm just in the same boat...but we seem to keep getting conflicting answers. Even you said I "only need a speaker that will handle what I'm are putting into it" yet followed up with "(depending on what you mean by moderate volume)". If "a watt is a watt" then a 200 watt tube head should be able to pair up to a 350 watt speaker just fine whether the volume knob is at 1 or 10, right?

    When I said moderate volume it wasn't in reference to the volume of the head, but of the volume outside my garage since I live in an apartment. In my scenario I wanted to crank my 200w tube head through a single 350w 10" or 12" speaker built into an isolation box similar to this:
    51ADlVxBW8L._SS400_.jpg 51dpkK-XTqL._SS400_.jpg

    But I was told over and over that I'd more than likely blow the speaker doing that and I should either scrap the idea, use multiple speakers, or go with a 600-800w speaker and even then I should be careful. Now I'm no mathmagician, but the numbers aren't quite adding up to me.
     
  18. Bassmec

    Bassmec

    May 9, 2008
    Ipswich UK
    Proprietor Springvale Studios
    Part of what makes an SVT a very good use of 300 tube watts
    is the fact that the designers thought that eight 10 inch speakers would compliment this design perfectly.
    There are huge differences between these technologies, either you go for some kind of modeling think sans amp + huge lightweight transistor amplifier power driving phenomenal X max on a heavy coned 12 or 15 inch loudspeaker probably ported with a 6 inch for mids.
    Think Fearful or BFM to get good displacement and dispersion from a very small footprint.
    Or you have far less amplifier power but blisteringly efficient loudspeakers, this is achieved by coupling together a great many similar far lower wattage drivers of considerably less X max and cone/voicecoil mass in a sealed box.
    Which technology are you currently following mate! because
    you can do one or the other...... but if you try to mix the two you will soon find that big heavy SVT tube amps like big heavy 8 X 10's.
    PS. NB two 8 X 10 cabs being far better with an SVT than just the one, its not about watts its all about coupling. :bassist:
     
  19. Bassmec

    Bassmec

    May 9, 2008
    Ipswich UK
    Proprietor Springvale Studios
    I think you would do far better to record a big valve amp set at 16 ohms output with the two outer output tubes pulled to loose 100 odd watts.
    Then using a motherload set on 8 ohms:
    http://www.motherload.co.uk/
    Just take the line out instead of rigging a speaker or mic.
    Unless you have a great loud room, mic pre and mic you wont get as straightforward great sound as a motherload direct out.
    And those isolation boxes are all really incredibly poopiee anyway.:bassist:
     
  20. Primary

    Primary TB Assistant

    Here are some related products that TB members are talking about. Clicking on a product will take you to TB’s partner, Primary, where you can find links to TB discussions about these products.

     
    Feb 27, 2021

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