with amp to buy?

Discussion in 'Home Theater Projects' started by Bryan Michael, Feb 24, 2005.

  1. Bryan Michael

    Bryan Michael Supporting Actor

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    ok i am going with 4 Avalanche 18 in a ib setup witch amp should i buy?
    qsc plx 1202,1602,2402,3002,or 3402?

    the 3002 and 3402 has the best dollar a watt but i dont know if i need that much power.
     
  2. Jason Dalton

    Jason Dalton Stunt Coordinator

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    Well, even the 3402 will barely drive the woofers to their excursion @20Hz.

    It really comes down to headroom and how loud you want to play it. With the 3402 you're looking at well over 120dB @20Hz. The 1602 has about half the power of the 3402 so you'll be down a little over 3dB. Is that 3dB worth the extra cost to you?

    Also,have you considered the Behringer EP line of amps? The EP-2500 is similar to the PLX2402 and its only ~$300. I haven't used it but it gets good reviews and from what I've heard is very solidly built.
     
  3. Chris Brock

    Chris Brock Second Unit

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    I would really also have to recommend that you look at the Behringer line as well. You could get 2 EP2500's for far cheaper and have more wattage and flexibility. 1 should be plenty though IMO. I would go with 1 Behringer EP2500 and go series parallel with the wiring and end up with a single 4 ohm load. With that amp you will have 2400wrms for only $299 from www.musiciansfriend.com.

    I have 2 BP 1804 drivers that I am only sending 300wrms a piece and I don’t think I could take anymore output. So 4 comparable 18's with double the wattage would be enough output to fill most gymnasiums IMO.
     
  4. Bryan Michael

    Bryan Michael Supporting Actor

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    like i said i am seting them up in a IB
     
  5. Jason Dalton

    Jason Dalton Stunt Coordinator

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    and...
     
  6. Chris Brock

    Chris Brock Second Unit

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    my 1804's are in an IB right now as well.
     
  7. Seth_L

    Seth_L Screenwriter

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    Unless I'm missing something you can bottom out one of those drivers in an IB with a little more than 150W at 10Hz. IBs do not have the air in the box to act as a restoring force on the driver, so they will go much further with small amounts of power.
     
  8. Jason Dalton

    Jason Dalton Stunt Coordinator

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    True, but thats @10Hz. Its not really practical to base your power requirents on 10Hz. It takes 600W per driver to reach the linear excursion limits @20Hz, so we're talking 2400W for four.

    Also, bottoming out the driver and hitting the linear excursion limit (Xmax) are generally not the same. It can be, but usually there are a few more millimeters of non-0linear excursion before the driver reaches the suspension/mechanical limits.
     
  9. RandyMathis

    RandyMathis Stunt Coordinator

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    I would consult with Thomas W but I think that Seth is right.

    An IB setup does not require much power.
     
  10. Chris Brock

    Chris Brock Second Unit

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    it is true that IB's do not require as much power and are mechanically limited but we are not talking about a PE IB 15 here. this is an XBL^2 18" driver with a linear xmax of 27mm and a mechanical limit that is greater then that. 150wrms on one of these in an IB would be like putting a honda civic motor in and Hummer. My IB with the 1804's laughs at the 300wrms per driver I send it now. There is another person on the forum with 2 1804's that drive then with 500wrms and they still laugh. Maby the Avalanche 18 is completly different from my 1804's but I am pretty sure that they would need far more then 150wrms to truly tap into their potential.
     
  11. Seth_L

    Seth_L Screenwriter

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    The Avalanche 18 takes less power than an 1804 to meet max excursion. An 1804 looks to take about 350W to meet it's max excursion in an IB (at 10Hz).
     
  12. Jason Dalton

    Jason Dalton Stunt Coordinator

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    Why are you basing how much power a driver can take based on its excursion @10Hz?
     
  13. Seth_L

    Seth_L Screenwriter

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    Because you're not likely to encounter any content at any apreciable volume below 10Hz.
     
  14. Bryan Michael

    Bryan Michael Supporting Actor

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    black halk down has some 8 hz bass. well i am going to order my subs and amp on monday. do =you think i will need more than 26l of displacement.
     
  15. Seth_L

    Seth_L Screenwriter

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    I'm not expert on IB subs, and I don't have any first hand experience, but there are a lot of people happy with IB's that move a lot less air.

    I'm sure ThomasW can offer some advice here. Maybe send him a PM with a link to the thread.
     
  16. Tom Rosback

    Tom Rosback Stunt Coordinator

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    26l? That's scary. Holy Buckets.

    I've been running a Beringer EP2500 and a single Tumult in a sealed enclosure. 5l. I can also heartily recommend the Behringer 2500. I've tested it and the review is on my website.
     
  17. Bryan Michael

    Bryan Michael Supporting Actor

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    ordered the subs they will be here tomarrow shiping weight of 57 lbs each. i have a few more questons. should i do a manafold type or asingle 4 ft by 2 ft pannel with all of them mounted in?
     
  18. Robert_Gaither

    Robert_Gaither Screenwriter

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    I'd suggest manifold due to most likely the stud spacing of your home.
     
  19. Bryan Michael

    Bryan Michael Supporting Actor

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    stud placement is not a factor i bult the walls and i can fix the walls.
     

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