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thinking about a power amp, how would you do this?

Discussion in 'Amps and Cabs [BG]' started by Josh Ryan, Oct 22, 2001.


  1. Josh Ryan

    Josh Ryan - that dog won't hunt, Monsignor. Staff Member Supporting Member

    Mar 24, 2001
    the specs are as folloows for the Mackie 800fr
    800 watts @ 4 ohms bridged
    550 watts @ 8 ohms bridged
    400 + 400 watts @ 2 ohms stereo
    275 + 275 watts @ 4 ohms stereo
    140 + 140 watts @ 8 ohms stereo
    here are the specs for the Hafler P3000
    400 Watts
    • Trans•nova
    • 150x2 @ 8ohms
    • 200x2 @ 4ohms
    • 400x1 @ 8ohms

    I have an 8ohm, 400watt 4x10 (SWR) and a fifteen that's unknown that I hardly ever use. I have no interest in buying a "bass" head. I'm leaning towards the Hafler, because it seems to match my needs best, any advice/help appreciated. Thanks.
     
  2. jasonbraatz

    jasonbraatz

    Oct 18, 2000
    Oakland, CA
    more power is always better.


    too much power for your cab and you can always turn down.


    too little and you risk driving the poweramp into clipping and taking out speakers.



    jason
     
  3. Ideally, in a solid state power amp you want two to three times the rating of your speakers. This will give you lots of headroom and a reserve for difficlut conditions like low voltage.

    Real deep bass, especially on an open stage outdoors, can eat up lots of watts. I play in a not-very-loud calypso band, and recently outgrew a 1200 watt Stewart World 1.2 when we were on an outdoor stage with low voltage. It's not fun when an amp goes into thermal protect even after you've turned way down to reduce distortion, in the middle of a gig.

    Check out the QSC PLX units. They are light and bulletproof and sound great. A good amp will last you a long time.

    Aloha,

    Jonathan Starr
    kalepa@maui.net
     
  4. Josh Ryan

    Josh Ryan - that dog won't hunt, Monsignor. Staff Member Supporting Member

    Mar 24, 2001
    So it's OK to buy an amp rated at say 550 watts at 8 ohms for a cab that says its a 400watt at 8 ohms? Thanks guys, let me know if I have this wrong. My trace elliot is a 250watt amp, and if I turn up too much it sounds like crap. This amp does fine for most bars, but we are occasionally playing bigger places, and it seems to me that I really need more juice. I just don't want to wreck my 4x10. Thanks again. -Josh
     
  5. Amen to that.

    Get the biggest amp you can find, and take advantage of all that clean power and head room.
     
  6. Josh Ryan

    Josh Ryan - that dog won't hunt, Monsignor. Staff Member Supporting Member

    Mar 24, 2001
    I can get aq 1200watt Mackie or Hafler if I want, but I'm still a little worried about blowing up the cab. (400watt) Is it hard to do?
     
  7. LowfreqB

    LowfreqB

    Nov 10, 2000
    United States
    I have a mackie 1400i and a carvin 4x10vt which is rated 400 watts peak. That means I run 1 channel of my mackie 300 watts at 8 ohms full power and not blow my amp. While my pre amp is set low as to not clip. The mackie your looking at is okay for bridged modes, but you lose the option of running in sterio with enough power. The 1400i or other larger power amps would be better for playing bass. The one thing I like most about the sterio option is running 2 different ohm rated cabinets.

    frodinkb
     
  8. Josh Ryan

    Josh Ryan - that dog won't hunt, Monsignor. Staff Member Supporting Member

    Mar 24, 2001
    So oif I plug my 400watt 8ohm 4x10 in and plug my 275watt 4ohm in I can somehow not wreck them with that amp?
     
  9. LowfreqB

    LowfreqB

    Nov 10, 2000
    United States
    If you run the amp in sterio you have 2 seperate channels. So the ohm ratings dont matter. Like they would for mono amp. The Mackie can run as low as 2 ohms which you shouldnt see with your set up.
     
  10. Josh Ryan

    Josh Ryan - that dog won't hunt, Monsignor. Staff Member Supporting Member

    Mar 24, 2001
    Cool, thanks very much! That clears things up a lot.
     
  11. Hey Jason,

    How is that Carvin amp working out for you? I'm thinking about getting the 600 watt version.