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XTI and SRX problems


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#1 ampeg610

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Posted 20 March 2010 - 11:35 AM

I am almost forumed out.  I cant read anymore posts.  Could you make me up some form of a diagram on how to hook up my pa the most efficient and powerful way possible. I have JBL SRX725's and JBL SRX718's, 2 Crown XTI 1000's, 1 Crown XTI 2000 and 1 Crown XTI 4000. Right now I have the 4000 set to Bridge mono running the Subs, X-over set at 90 and the 2000 set to stereo running the 725s, no X-over. The 1000's just sit there.  I think useing the 1000's for the 725's set to bridge mono would give me more power to them. that would leave the 2000 just sitting there. If i need to buy another amp I will do so, I just need to know the best solution to my problem. Would love to use the internal dsp setting for X-ing over everthing but I'm at my wits end on how to do that with the internal setting and different wiring for the speakons. To many posts about setting and wiring configurations. I would love to use band manager but just getting it hooked up with out that is becoming ever increasingly impossible at this point.  If I could get it all connected the best way possible I would use Band Manager and or an external crossover, whatever is the best. PLEASE PLEASE PLEASE. CAN I GET SOME HELP

Kevin

#2 Kevin Heber

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Posted 22 March 2010 - 09:32 AM

The SRX725 is a monster of a speaker and really needs a monster amp to drive it.  The XTi4000 is underpowered for the job but will have to do.

I would therefore use one of the XTi1000's and the XTi2000 to drive the 718's in bridged-mono.

#3 ampeg610

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Posted 22 March 2010 - 02:34 PM

View PostKevin Heber, on 22 March 2010 - 09:32 AM, said:

The SRX725 is a monster of a speaker and really needs a monster amp to drive it.  The XTi4000 is underpowered for the job but will have to do.

I would therefore use one of the XTi1000's and the XTi2000 to drive the 718's in bridged-mono.
OK Now we're getting somewhere. Now do I set it up as 2 way stereo? The 4000 set to stereo and the 1000 and 2000 set to bridge mono, but how do i go about hooking those two to the 718's so that they both get fed an equal amount? What would you suggest I get to run the 725's and the 718's, keeping in mind what I already own?

#4 ShaneF

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Posted 22 March 2010 - 08:33 PM

View Postampeg610, on 22 March 2010 - 02:34 PM, said:

View PostKevin Heber, on 22 March 2010 - 09:32 AM, said:

The SRX725 is a monster of a speaker and really needs a monster amp to drive it.  The XTi4000 is underpowered for the job but will have to do.

I would therefore use one of the XTi1000's and the XTi2000 to drive the 718's in bridged-mono.
OK Now we're getting somewhere. Now do I set it up as 2 way stereo? The 4000 set to stereo and the 1000 and 2000 set to bridge mono, but how do i go about hooking those two to the 718's so that they both get fed an equal amount? What would you suggest I get to run the 725's and the 718's, keeping in mind what I already own?
An excellent resource in addition to this forum is Pro Sound Web. Read the first sticky for new forum members and post in the Lab Lounge. http://srforums.pros...x.php/f/5/2797/

The SRX 725's need approx 2,400 watts at 4 ohms. I would run 1 bridged XTI 2000 into each (approx 2,000 watts). The SRX 718's need approx 1,600 watts at 8 ohms. A bridged XTI 4000 will give you 2,400 watts into 8 ohms that will provide you some headroom. I also read that you purchased SRX 728's. The XTI 4000 into 4 ohms is 3,200 watts. You do not have all of the correct amps to run the speaker that you have.

The SRX speakers are very power hungry and will take all of the power you can throw at them. That being said, the best setup would be an I Tech 8000 on the subs in stereo and an XTI6000 on the SRX725's in stereo. While the XTI's give a lot of power, the Itech is the best match for subs. The Itech's also have additional voltage limiting that would make it virtually impossible to overpower the drivers.


There are a few issues that you will need to struggle with and learn.

1) The best setup would be to use the DSP in the XTI's or Itechs. The JBL Website has the files to import for the XTI's. http://www.jblpro.co...CatID=18&Run=1. You should connect to your laptop and work with System Architect or Band Manager to make these changes. Since you are running Biamp, you will need to copy and paste the settings into the amp to make the configuration work. For eg., the SRX 725 passive with a sub setting has the DSP crossover for the sub on channel 1 and crossover for the 725 on channel 2. After you import and find the DSP setting in one of the presets, you would need to copy the crossover from channel 2 onto channel 1 so that channel 1 will have the settings for the SRX 725. You then need to click on Bridge-Mono in the output Mode link.

2) Speaker cabling. If your running Bridged amps, you need to make a patch panel fpor your amp rack. I.e. the speakon to the amp requires the positive wire to be 1+ and the negative wire to be 2+. Going to the speaker the 1+ goes to 1+ and the 2+ from the amp needs to go to 1- on the speaker. If you just change the Speakon on one of your speaker wires (in lieu of making a speaker patch bay) you must carefully label the Speakon end and make sure you don't forget to plug the approriately wired cabled to the amp and speaker. If your running a more powerful amp in stereo, you will not have this issue.

3) If you have someone local that could help you, that would be your best bet. Talk to the sound guys with some of the local bands and see if they can help you.

4) If you leave an e-mail address on this forum, I will e-mail you mine and can set up the DSP files for the XTI's to get you going.

#5 ShaneF

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Posted 22 March 2010 - 08:42 PM

View Postampeg610, on 22 March 2010 - 02:34 PM, said:

View PostKevin Heber, on 22 March 2010 - 09:32 AM, said:

The SRX725 is a monster of a speaker and really needs a monster amp to drive it.  The XTi4000 is underpowered for the job but will have to do.

I would therefore use one of the XTi1000's and the XTi2000 to drive the 718's in bridged-mono.
OK Now we're getting somewhere. Now do I set it up as 2 way stereo? The 4000 set to stereo and the 1000 and 2000 set to bridge mono, but how do i go about hooking those two to the 718's so that they both get fed an equal amount? What would you suggest I get to run the 725's and the 718's, keeping in mind what I already own?
I sent you a pm in this forum with my e-mail address.

#6 BaldGuyBrit

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Posted 28 September 2012 - 12:51 PM

Just wanted to say to Shane - Wow. What an excellent answer. Think I would have to read it a few times to understand. So glad I joined this forum.Very very cool.