Speaker combinations?

Discussion in 'Amps and Cabs [BG]' started by Bassmonty1981, Dec 2, 2015.


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  1. Bassmonty1981

    Bassmonty1981

    Nov 28, 2015
    Hey guys,
    Relatively new to the whole amphead/speaker system setup. I have an Ampeg SVT Pro7 head with 1000W capability at 4 ohms. However, the cab I have (SVT HLF 4x10) only has an output of 500W at 4 ohms. I really like the tone, although I have issues with having to crank up my amp head to get loud enough at times and I would eventually like to try and get the whole 1000W output or close to it. I'm thinking about adding a 1x12 speaker to my rig to get some more low end, but had questions about the electrical needs. Most I have seen are about 300W, which would give me about 800W output, but is it super important that they be rated at 4ohms as well? I remember reading that my amp head is only rated at 600W at 8ohms for example. If I had a 4 ohm speaker and an 8ohm speaker, what would happen? Does it matter that I have 2 parallel speaker channels coming out of my amp head so I wouldn't have to daisy-chain the speakers? Thanks for your help guys.
     
  2. cfsporn

    cfsporn

    Aug 20, 2011
    New York City
    So first of all, you can not add another cab to your rig. Doing so will drop the total impedance below 4 ohms causing damage to the amp.

    Second, why do you think adding a 112 would add lows? You all ready have the bassiest cab Ampeg offers.

    Third, that amp int that cab should peel the paint off of walls. What are your controls set at?

    Fourth, cabs don't make power, they receive it from the head and turn it into sound. Therefore, your SVT Pro 7 is putting all 1000 watts into the 410HLF.
     
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  3. groove pump

    groove pump

    Oct 24, 2006
    Agree. If you want more volume than you're currently producing with this rig, I'd say you need to probably look for a pair of 8 ohm cabs. Paired together, that will give your head a 4 ohm load.

    Unless you've got some of your mids eq'ed out of your sound (scooped), you'll likely need to look for more speaker to get more volume. A pair of 8 ohm 4x10's is one possibility.
     
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  4. Bassmonty1981

    Bassmonty1981

    Nov 28, 2015
    Thanks for the response. Maybe I've been getting bad information, but I've been told that 10 inch cabs are good for the midrange and 12s are better for getting the low end out. I should specify that I play on a 5 string. Also, I was under the impression that while the head can put out up to 1000W, that speaker cab is only rated to 500W and will not put out any more power. Lastly, I heard that parallel outputs would not affect the ohms vs trying a chain of speakers.
     
  5. ChefKen

    ChefKen

    Aug 30, 2014
    NW CT
    You need to stop listening to those who speak this.....There are so many threads on these subjects I do not know where to start. Speaker cabinets emit sound waves measured in decibels.....if they produced power you would be getting a shock from the speakers.....Speaker size does not translate like you have been mislead....4x10 can produce all the deep and mid tones you will ever need. Adding a single 12' to any rig with 4x10 will blow up the single 12" unless you have a way to independently control the power to each cab....ie. bi-amp. Others know way more than I....like i said there are hundreds of threads...
     
  6. Can't reply to the daisy-chaining but I'm sure someone will chime in shortly.
    Adding a 4 om cab and a 8 ohm cab would mean your amp would need to be stable at 2 ohms (4x8/8+4=2.6666). Since it's a 4 ohm amp, no way josé. Everyone's going to remark on the size of the speaker, so I won't. Agree with above, you need more speakers. An 8x10 will probably be at 4 ohms, so that would probably work well or as suggested above 2 4x10s at 8 ohms.
    In the medium term, you may want to lift the cabinet off the ground so you can hear yourself better if in a band situation.
     
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  7. mbelue

    mbelue Supporting Member

    Dec 11, 2010
    "Daisy chaining" or connecting one cabinet into another and then into an amplifier is electrically the same as plugging both cabinets into the amplifier.

    What you are attempting to describe is a "series" connection. These require a specially wired box or cable to do so. These are not sold at guitar center.
    By any stretch of imagination you do not have one of these.
    Therefore:you cannot connect another cabinet to your amplifier in conjunction to the cabinet you already own, without damaging your amplifier.

    For more loudness of any variety you need to get an entirely different cabinet( to be used by itself). Most likely some variety of high Xmax premium driver cabinet if you want more "lows".
     
    Last edited: Dec 2, 2015
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  8. cfsporn

    cfsporn

    Aug 20, 2011
    New York City
    Whoever told you that was wrong on all three counts.
     
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  9. ahc

    ahc

    Jul 31, 2009
    No. Virginia
    Daisy chaining cabs will give the same impedance as plugging the cabs individually into the head. In other words, two daisy chained 8 ohm cabs will produce a 4 ohm load as will plugging two 8 ohm cabs into your head. Two 4 ohm cabs connected either way will produce a 2 ohm load which will let the magic smoke out and fry your head.
     
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  10. Bassmonty1981

    Bassmonty1981

    Nov 28, 2015
    Ok, I'm getting a lot of good info here and thank you guys for that. Last question that I still don't get yet, however. As I said, the amp gives out 1000W and the speaker is rated at 500W. Does that mean that only 500W goes through regardless of how much volume I put through the amp? I don't want to blow anything out here and this is the only part I'm not quite getting. If I had two 8 ohm speakers each rated at 500w, I'd be able to use the full amount of power from the amp, right?
     
  11. ChefKen

    ChefKen

    Aug 30, 2014
    NW CT
    You are getting there!!!! The second part is correct. Two 8ohm cabs could safely use ALL the power....However. The amp is going have all 1000 watts on tap into your 4x10....You have a volume control. Use it. The Amp will be plenty loud before you max the cab.
     
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  12. mbelue

    mbelue Supporting Member

    Dec 11, 2010
    500w is your speaker's rating. Using more than that will damage it. Kind of like a speed limit. They tell you not to but what you do is your choice.

    Your amplifier can supply twice what is safe for that cabinet. It doesn't care about your cabinets rating.
     
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  13. cfsporn

    cfsporn

    Aug 20, 2011
    New York City
    No. Amps make the power, cabs take the power. Since your cab is a 4 ohm cab, it is getting the full 1000W.

    The rating means that the cab should only be used with a head that has a rated output of 500W or less (sometimes).
     
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  14. mbelue

    mbelue Supporting Member

    Dec 11, 2010
    Or he can ride the volume knob and listen for farts. Most likely the cabinet is already blown.
     
  15. ChefKen

    ChefKen

    Aug 30, 2014
    NW CT
    many many folks here run huge amps.....very few 1200 watt cabs out there. I think its a headroom thing. Its all in the players hands. Crank the knobs at your own risk.
     
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  16. Bassmonty1981

    Bassmonty1981

    Nov 28, 2015
    The part that is weird for me is that the amp and cabinet came as a package through ampeg and guitar center. Why would they combine those two if it could potentially blow out the speaker?
     
  17. mbelue

    mbelue Supporting Member

    Dec 11, 2010
    Why does Ferrari sell cars?

    Because they can. Capitalism at it's finest.
     
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  18. ChefKen

    ChefKen

    Aug 30, 2014
    NW CT
    You can blow nearly any speaker with any amp.....You need to use the rig responsibly.....So few gigs require more than you have. What kind of music do you play? Outdoors with no PA support to thousands???
     
  19. cfsporn

    cfsporn

    Aug 20, 2011
    New York City
    What are your eq settings?
     
  20. B-string

    B-string Supporting Member

    Guitar Center "put the package" together, not the manufacturer. You can put anything together as a "package" (deal), doesn't mean it is a well matched package. You could sell a half gallon of milk and half gallon of orange juice as a
    breakfast "package", I wouldn't combine the two in the same glass.
     
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    Primary TB Assistant

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