4 Titan 39's and 4 O 12's amp question.

[fluid4]

First post, have read many though and feel like I have a small understanding of Bills designs and power requirements but want to just run a question by the group. I'm sure when I buy my plans this question may be answered but I want to unload some gear while keeping what I may need.

I plan to build 4 Titans and 4 Omni top 12's would I be ok to run 2 titans per side on a crown xls2500 at a combined 4 ohm load and have enough power? (Will build 24 inch model with the eminence 3012lf driver).
Would this amp work well to do the same with the O 12's? (Not sure on drivers yet but likely the premium setup).

Essentially one xls2500 would run the titans and one would run the O12 tops


If all goes to plan I will keep my 4 powered EV ekx 18's and 2 powered ekx 15 mains and do a comparison out in a wide open bean field in the spring. I gather from all that I have read that the EKX line will begin to gather dust after that point or be readily sold off.

Awesome forum, awesome site, awesome designs... can't wait to get started.

Brian

[LelandCrooks]

Should be plenty for the subs. 440w into 8 is just about right. Voltage limit the amps, there are many threads here on how to do that. If it were me I'd probably bridge it and then voltage limit it. Running unbridged it's right at it's limit, bridged into 4 ohms it should be coasting. Limiting is absolutely required if you bridge it.

Otops run 4 ohms stereo. Picture perfect.

[fluid4]

Thanks for the response, I am kicking myself as I just sold a drive rack PA two prior to discovering this website!

[Bruce Weldy]

. 440w into 8 is just about right. Voltage limit the amps, there are many threads here on how to do that. If it were me I'd probably bridge it and then voltage limit it. Running unbridged it's right at it's limit, bridged into 4 ohms it should be coasting.

Time out!

Bridging to a 4 ohm load is fine for two T39s. You can't do that with four.

Either go with the XLS1500s and bridge two of them for subs (that's what I do), or just run the 2500 in parallel mode.....personally, I don't think the 2500 has enough headroom for this job....but, it will work.

I do use a 2500 for my 4 OT12s, but I run mono.

[fluid4]

Bruce,
I assumed I would run the 4 Titans in parallel mode but was worried they may not get enough power in this configuration with the XLS 2500, if I use the XLS 1500 in bridge mode my only real concern is Bills advice against using bridge mode. Have you had any problems using the 1500 bridged?

[Bruce Weldy]

Bruce,
Have you had any problems using the 1500 bridged?

Nope. Been doing it for a few years now.....I have three of 'em running six subs. Driverack provides the limiting.

I've considered stepping up to a much larger amp that could run all of 'em, but I really like the fact that I have 3 amps running....if one craters, I've only lost 1/3 of my lows. It takes a little more room and a little more weight, but I really think it's worth it.

[fluid4]

I can agree with that logic!

[kkip]

I am running four 3012lf loaded T39s on one Crown XLS-2500 amp. The amp is configured in two channel mode (not bridged). Two subs are connected to each channel in parallel for a four ohm load. The amp has enough power to easily drive the subs to the 55 volt limit. Crown's engineer said that the class 'D' XLS amps work well as long as you don't drive them into clipping and don't load them below 4 ohms. Clipping and a lower impedance load will causes significant heat and can quickly overheat the amp. I measured clipping at just over 60v on the XLS-2500. So the amp is at about 90% when the limiter engages. I'd prefer 80% or less, but the amp stays nice and cool even when driven hard.

I have also driven the four T-39s with a Crown XTi-2000. The XTI has more headroom but weighs twice as much and is less tolerant of power line voltage issues.

For the OT-12s, you could use a much smaller amp. I run mine with a Peavey IPR1600.

[LelandCrooks]

Need to read a little slower I guess. I read 2 instead of 4..