question for QSC users

Discussion in 'Amps and Cabs [BG]' started by thetaxmiser, Jun 23, 2003.

  1. thetaxmiser

    thetaxmiser Supporting Member

    Feb 23, 2002
    Sonoma County, CA, USA
    My new QSC PLX 3002 arrived over the weekend. I hooked it up to my alembic pre and gave it a spin. I ordered this based on reputation and reviews...I had never heard one. The fan seems kinda loud...more than just air whines a bit. How quiet are these fans supposed to be? Its been a while since I have had a high powered rig but the fan seems quite a bit louder than the one in a Mesa Boogie D-180 I used to own.

    Any input is appreciated. By the way, it sounds great with my older red knob F2B.


  2. Petebass


    Dec 22, 2002
    QLD Australia
    A bit of fan noise is a small price to pay for the benefits the fan provides. Remember that heat is the natural enemy of all things electronic, especially amps. Amps with active cooling blow up a lot less often and last heaps longer than those without.

    You shouldn't have a problem with the fan noise at gigs. The dull roar of crowd chat will usually be much louder than even the noisiest fans. You may have a problem in the recording studio but there isn't a a fan out there that is quiet enough for the studio. The way around this is to put the amp in a seperate room to the cab. You'll need long speaker cables for this though.
  3. thetaxmiser

    thetaxmiser Supporting Member

    Feb 23, 2002
    Sonoma County, CA, USA
    I understand some noise is to be expected. This fan just seems a bit noisier than I expected.

    This would never be a problem in a club or on a casual gig but now a good portion of my playing is done at church. I love having the power/headroom and I like just having one rig for any occasion but perhaps I will need to change that for the variety of situations I play in...there were never any pauses for silent prayer in my club playing days!

  4. Piezoman


    Nov 29, 2002
    Bronx, New York
    I was not aware that this happens:eek: :eek: :eek:
  5. It's not an issue if you're in a large place w/ people in there. I played an outdoor show w/ mine. Someone asked me about how bad the fan noise was on it before playing. We were standing 3 feet away. I told him to put his hand in front of it so he could feel that the fan was on, and he couldn't hear it.

    Complaining about fan noise is really nitpicky folks. You know it's gotta have one, but yet it bugs you. Do you all have some kinda OCD? ;)
  6. Petebass


    Dec 22, 2002
    QLD Australia
    I just had a thought. Some amps have a variable fan speed so you can turn it down if it's blowing too hard. I'm not sure about QSC but it can't hurt to check.
  7. jerry

    jerry Doesn't know BDO Gold Supporting Member

    Dec 13, 1999
    I have the 3002 & 2402....and fan noise is not a issue at all.....great amps!!
  8. lneal


    Apr 12, 2002
    Lee County, Alabama
    I don't notice a noise per se, but rather a drone from the fan on my PLX3002. I have a PLX 1602 and it sounds the same way. I don't find it annoying. If you want fan noise, you should try my QSC model 1700 amp!! :eek:
  9. Jerry J

    Jerry J Supporting Member

    Mar 27, 2000
    P-town, OR
    I don't find that fan noise, in my PLX's any louder than what is in my EBS Fafner or my WT-800. But the PLX doesn't seem to vary the fan speed as much as the the one in the Eden stuff.

    That PLX is a wonderful amp. I'm very happy with mine.
  10. PLX2402 here.
    Great Amp
    No fan noise issue. I can hear it but it doesn't squeel. Sounds like a defective fan. It happens.
    My fan keeps me cooler when I sit in front of it practicing.

    It does run harder and possibly louder when I bridge. I'm still going back and fourth with bridging though. For the most part I don't with 2402's extra power.
  11. FunkySpoo

    FunkySpoo Supporting Member

    Feb 6, 2002
    I have a 1602 and the fan on mine is drowned out by the guitar players single coil hum amd the keyboard players vintage tube buzz. The fan on mine isn't any louder than any other fan cooled amp I've heard.
  12. Fan noise: small price to pay for 3000 watts in a 25 pound package!!!!!!

    Stewart have some fanless high powered amps (not 3K watts, though).

    (I've got an Alembic F1X + PLX 3002 also)
  13. Bob Lee (QSC)

    Bob Lee (QSC) In case you missed it, I work for QSC Audio! Gold Supporting Member Commercial User

    Jul 3, 2001
    Costa Mesa, Calif.
    Technical Communications Developer, QSC Audio
    Petebass: the fan speed in the PLX amp varies with the heat sink temperature; if the heat sink is hotter, the fan will move more air than when it's cooler.

    thetaxmiser: Well, it's a subjective thing, but I use my PLX 1602 every week in church and no one's ever complained about the fan noise.

    FWIW, the RMX amps have noticeably noisier fans, but no one's ever mentioned them being objectionable ... only the PLX! ;)
  14. rickbass

    rickbass Supporting Member

    Just dumping a rock on top of a mountain that already exists in this thread - I was surprised by the PLX's fan noise, too, when I first hooked it up. In relation to my Carvins, it is loud.

    BUT - when it's time to go to work, it doesn't matter one bit............unless you place a mic by the fan!
  15. lo-freq

    lo-freq aka UFO

    Jan 19, 2003
    The Republic of Texas
    I have a PLX1602. The fan on mine is barely audible in a quiet room 10 ft away, no whine at all. Maybe you need to have your amp checked.
  16. Petebass


    Dec 22, 2002
    QLD Australia
    :) I'd hate to work in marketing.
  17. I have a PLX1202 and on the gig I don't notice the fan noise at all. In the studio it is distracting. I think that when you play it in a live situation you won't notice any noise.