ShaneF

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  1. XTI and SRX problems

    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.
  2. XTI and SRX problems

    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.prosoundweb.com/index.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.com/catalog/general/technicallibrary.aspx?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.
  3. David, I'm looking for some guidance in setting up the Peak Voltage and RMS Power within the I-Tech 6000 for a pair of VRX 932's on each side of the amp. Looking to protect the speakers. Can you provide the settings for this set up? Thanks, Shane Fleming
  4. XTI 4000 and 2x VRX 932LA

    I am running the VRX 932 cabs set to passive. And the amps is running in dual mode (Left and Right). so to sum it up i am running 1 Vrx cab on each channel. The SRX user guide gives recommended crossover frequencies (HPF: 80Hz, 24dB/Octave - LPF: 80Hz, 24dB/Octave) for my SRX 718S Subs. this is great as i can make a preset that follows these setting. But in the VRX user guide the only information they give you is what i wrote in my first post, no HPF or LPF setting are given, nothing as easy and detailed as in the SRX guide. Haydn, You are underpowering the VRX's running each cab off each side of the XTI. If your running dual mode 1 VRX cab on each channel, they are only getting 650W at 8 ohms. You want to bridge the XTI's and run 2 cabinents off of each amp. At 4 ohms bridge the cabinets will get 3200W combined at 4 ohms (each cabinet will get 1,600W). Dedicate 1 amp as a left and the other as a right to get stereo. See the system specs for the VRX 932's. For the crossovers. since your running passive, hook up the amp to a PC using System Architect and manually input the crossover setting. The tunings on JBL's website has the highpass at 81.1Hz L-R filter 48db/Oct for the VRX 932's. The lowpass is run out. Hipass on the subs is 31.3Hz BW 18 db/Oct Low pass 81.1 db/Oct L-R 48 db/Oct. Shane Thanks for the help Shane. Running in bridge mode am i not then over powering the VRX's? Should i run the amps in bridge mode when driving the SRX 718 subs, giving them 1,600W each too and run one amp for left and one amp for right? Oh also, the crossover frequencies you gave me, are they for the SRX 718S? Thanks Again No your not overpowering the VRX's running the XTI's bridged into them. Please see the specs for the VRX's - 800 / 1,600 / 3,200. I'm running 1 XTI bridged per VRX 932 box. At 8 ohms that is 2,400 W per box with headroom. Sorry on the subs - If you go to JBL's site and look in the tunings downloads for the SRX's the SRX 718 has tunings as follows: highpass 31.5 HZ butterworth 18 / lowpass 80HZ LR24. The SRX 718 says its 8 ohms 800 /1,600 / 3,200W. So bridging an XTI 4000 (2,400W at 8 ohms) into the SRX 718 would be a good match with ample headroom.
  5. XTI 4000 and 2x VRX 932LA

    I am running the VRX 932 cabs set to passive. And the amps is running in dual mode (Left and Right). so to sum it up i am running 1 Vrx cab on each channel. The SRX user guide gives recommended crossover frequencies (HPF: 80Hz, 24dB/Octave - LPF: 80Hz, 24dB/Octave) for my SRX 718S Subs. this is great as i can make a preset that follows these setting. But in the VRX user guide the only information they give you is what i wrote in my first post, no HPF or LPF setting are given, nothing as easy and detailed as in the SRX guide. Haydn, You are underpowering the VRX's running each cab off each side of the XTI. If your running dual mode 1 VRX cab on each channel, they are only getting 650W at 8 ohms. You want to bridge the XTI's and run 2 cabinents off of each amp. At 4 ohms bridge the cabinets will get 3200W combined at 4 ohms (each cabinet will get 1,600W). Dedicate 1 amp as a left and the other as a right to get stereo. See the system specs for the VRX 932's. For the crossovers. since your running passive, hook up the amp to a PC using System Architect and manually input the crossover setting. The tunings on JBL's website has the highpass at 81.1Hz L-R filter 48db/Oct for the VRX 932's. The lowpass is run out. Hipass on the subs is 31.3Hz BW 18 db/Oct Low pass 81.1 db/Oct L-R 48 db/Oct. Shane
  6. Xti4000 driving vrx system

    Sounds like your gain structure is not correct somewhere along the chain. I'm assuming your running a bridge XTI 4000 into a pair of VRX 932's? I also hook my XTI's up to a PC while running to monitor the inputs and outputs. If your outputs are running behind the inputs add some gain within the amps crossover (amp output) to get the SPL and to keep the input out of clip. Check the crossover output gains on the drivearck as well and try to get all the inputs and outputs along the gain structure equal.
  7. John I'm currently using SRX 722's and have a pair of VRX 932's coming in this week. I have been reading posts all week on the set up. Currently I have all XTI 4000 amps. The VRX 932's are looking for 1,6000 watts into 8 ohms. They could run on as little as 1,200 and as high as 2,000 as a range. XTI 4000 is 650 watts at 8 ohm and 2,400 at 8 ohm bridged. If you were running mono, 1 XTI 4000 bridged would give you 1,6000 per cab which is right in the money (2 cabs on one bridged XTI 4000). I'm setting my system up for this weekend with (1) XTI 4000 bridged per VRX 932 which will give 2,4000 watts at 8 ohms. I have read from users that these boxes eat the power. I just wouldn't under power them with 650 watts (VRX run on each side of the amp stereo) and risk jeopardizing those 3 horns. If you have (2) XTI 4000's sounds like you would need one more to run stereo. (2) bridged for each VRX 932 and run each sub off each side of an XTI 4000 - at 4 ohms 1,200 watts per side. If you run mono, you could do this with (2) XTI 4000's. A perfect match is a bridged XTI 2000 per VRX 932 - 1,600 watts at 8 ohms. I know I will get another pair of VRX 932's soon, so will run 2 cabinets off (1) XTI 4000 to get each box 1,600 watts. Also the XTI measurements are at 1kHz, so the power available will be slighlty lower.
  8. (2) 4 ohm speakers run in parallel will result in a 2 ohm load. You can not put a 2 ohm load on a bridged amp. You would only be able to use the XTI 2000 bridged on (1) of the single 18's. That much power if run hard may burn the voicecoil. Also look into connecting the amp to your PC and use the software within System Architect. Easy to set up the amp and great digital processing for Low Pass and High Pass crossovers.
  9. XTi 1000 or XTi 2000

    The JRX 18 is a 4 ohm cabinet. You should not run an amp bridged at less than 4 ohms, so do not put both speakers on the amp bridged. The best you can do is run each speaker off each side of the amp. At 4 ohms that will give you 500 watts per speaker on the XTI 1000. You can Y the input so both sides of the amp get the same signal. Some things to experiment with. Download the System Architect software. Go to insert, Crown and insert an XTI. Play with the software. Go to JBL's site and download the JRX tunings. Inport one with a sub and look at the crossover settings. Use the settings for the sub on each channel. You will not need a crossover or EQ outside of using the amp. Download the settings in the amp.
  10. wiring subs

    See the Pro Sound Web Forum. Wealth of information. http://www.prosoundweb.com/home/forum_jump/
  11. Will the newest version of System Architect 1.6 configure and control USP2's? Thanks, Shane Fleming
  12. Thank You that is what I was looking for.
  13. David, How do I order the 3 prong barrier strip adapter to XLR for the USP3? I called the parts department and they were not sure what I was asking for. Do the USP3's usually come with a plug adapter when new? These I beleive are called Phoenix plugs but they come in different molds. Thanks, Shane Fleming