with amp to buy? (1 Viewer)

[Bryan Michael]

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.

 

[Jason Dalton]

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.

 

[Chris Brock]

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.

 

[Bryan Michael]

like i said i am seting them up in a IB

 

[Jason Dalton]

and...

 

[Chris Brock]

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

 

[Seth_L]

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.

 

[Jason Dalton]

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.

 

[RandyMathis]

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

An IB setup does not require much power.

 

[Chris Brock]

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.

 

[Seth_L]

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).

 

[Jason Dalton]

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

 

[Seth_L]

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

 

[Bryan Michael]

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.

 

[Seth_L]

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.

 

[Tom Rosback]

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.

 

[Bryan Michael]

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?

 

[Robert_Gaither]

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

 

[Bryan Michael]

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