I always planned on the using an EP2500 with 4 Q18s (as seems to fit so many here) but with the new IB 18s from Scott will the EP2500 be overkill? Or maybe I should ask are there any dangers? Because I know you can NEVER have too much power!
Well, I haven't looked at the clip lights lately when playing loud bassy movies. Though you may remember I had some clipping when playing test tones. When I bought the drivers, Scott said they could handle 600W each. At 8 ohm each driver is only seeing a max of 225 W. At 2 ohm the EP2500 supposedly puts out 1200 W per channel, that would give me 600w per driver. kadiddle
Work is for people who haven't learned how to plunder
While the amp will drive the subs easily at low frequencies (if you have 600 watts or more per sub) the sub can take more power at higher frequencies, say 40hz and up, before hitting mechanical limits. That being said i'm going to drive them with my plx 3602 with is rated for 3600watts x 1 at 4 ohms. Now since I can't get 4 ohms final load times 1 or 2 ohm stereo times 2 it will be a bit less then that. Give them as much power as you can afford, that would be my suggestion. Good luck!
Digging this up from the grave again as I plan to build an 4x IB318 array and have two EP4000 amps. Was planing on getting 4ohm drivers and running one off each channel for a nice 4ohm load on the amps. Will this be complete overkill (I'm a BIG fan of amplifier headroom) or will I be fine?
Point is I have the EP4000s lying here, might as well use them if there's any point.
So, is it recommended to go for one 4ohm driver on each channel for a 4 ohm load on two amps, or go for 2ohm drivers in series for a 4ohm load on one amp? I'm partial to more power on tap and limit exursion through highpass, but I've never built an IB before so I'm in a little over my head.
I've shared this many times, I hope this helps; I have four Fi, IB3-18s, and two EP4000 amplifiers.
Currently, I'm powering my 4ohm drivers in series, so 8ohms and only using one EP4000, no high pass protection. That's around 225w/per driver.
I can bottom my drivers if I bridge my amp and use a 4ohm mono load ~400w-500w per driver. I can bottom my drivers if I use both amps, and one channel per driver, which is around 650w per driver.
The good thing is simply experiment with both test tones and material, in free air, in advance. Use varying load configs, 2ohm parallel, up to 8ohm series. It's not for me, but if you want to employ a HP filter, go for it.
Free air in advance, with your entire signal path in place, ease up to the limits
Post by atledreier on Dec 31, 2013 18:00:49 GMT -7
Excellent! I've ordered the drivers, so now the waiting game begins.
I'll give the different constellations a go, but so far it seems two amps with limited gain/ loads of attenuation is the best choice. That way I'll keep a high damping factor even as levels increase. I'll just have to be careful if I feel the need to push the system at all. Don't really think so though, the sims I've done indicate there'll be plenty of SPL on tap.
What was the excursion like at that level, and how much was "in reserve" for a 10Hz spike?
Ah, 10hz, therein lies the problem.
If I power my drivers with more than the 225w a piece, I'll bottom them with soundtrack material. Albeit not very frequent, but I want absolute bullet-proof/worry free operation. So, I'm opting for wide open unfiltered bottom octaves, no high pass. There are those using the same driver, just a newer version, that seem to get much more excursion prior to bottoming, so results may vary.
My best guess, there's at least two versions of this driver; the version I own has a bit less clearance than the more recent version, with the heavily bumped, uncolored back plate (mine has the slightly bumped black color back plate).
Much below 10hz doesn't seem to be an issue, it's typically just not high enough in level on the source material.
I agree single digits is not an issue. I used to have LLT sonotubes with a 13 Hz tuning, and unloading under tuning was never an issue, even with sources that allegedly dipped into the singles. I am confident it'll be plenty. My current system struggle to reach past 18Hz, but is VERY capable above 20, so it'll be a change, and a new experience.
Behringer now makes a 4 channel power amp, the iNuke NU4-6000 for ~ $350. It, "Delivers 4 x 1500 Watts into 2 Ohms, 2 x 3000 Watts into 4 Ohms and weighs less than 12 lbs / 5.5 kg"
So this simplifies things for me, contemplating the best way to wire up a 4x18 manifold. No longer having to worry about bridging all 4 together, if that was the right way anyway with the older EP-4000.