bucksarge

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  1. This is a good link that illustrates how speaker placement affects the sound. It doesn't cover one of the most recommended speaker placement which is placing one speaker on top of the other when the top speaker is up side down to make the HF drivers as close as possible which is what I suggest you do. http://homepage.mac.com/randyhyde/webster....audioStuff.html The other option is to bi amp the two speaker sets and subs of the FOH, lets say 100Hz and below goes to the 18 inchers that are on the floor, 105Hz and all the way up goes to one set of JBLs, the other set of JBLs would get 105Hz to 400Hz. This combined configuration would give you quasi three way configuration. The speakers have to be placed with a distance of less then 1/4 wave length of the higher frequency fed to the driver (400Hz here so less then 8.5") and mounted up on speaker stands to get rid of boundary cancellation from the floor and walls. This configuration needs three separate amps and one dedicated DRPA. Dakos, Very good info, thanks!! Regards, RogerB
  2. Dear Roger, The Line Outs on the back of the amp are connected in parallel to the inputs, no processing or conversion of any kind is done to the signal on that stage so it's safe to daisy chain amps like that. A few pointers: Make sure the cables are not too long - You really have to ever do it here, anything under 100ft is fine, even longer is fine. Use balanced twisted cables - Ground can be lifted on one end of the cable, not on both ends. If you need Phantom Power then both grounds need to be connected, in this case pay attention to the next pointer. You need to try and connect all your gear to wall sockets that are grounded the same way otherwise you will need to "lift the ground" to eliminate ground loop hum (not possible when using phantom power). Make sure they are not running in the vicinity of the power cords or where disturbances might be picked up. Now for the configuration:The 4 X monitors are fine from the aux, they should get a full range signal. I don't know which amps you are using (with the exception of one IT4000) on which speaker model, I didn't see any crossover in the gear list and you need one for FOH or use the internal amps DSP or built in crossover but you need one in every amp except for the monitors amp. One more thing, I see you use 4 X 15" JBLs for FOH, it's not recommended for getting higher SPL due to comb filtering, only for wider coverage. If you need more clarifications please ask. Hello Dakos, As usual you are very informative.......Thank You! About your pointers: The units will be plugged in to a Furman 20 amp power conditioner. The cables will be less than 50 ft. I'll ensure the use of balanced twisted cables. About your comments on the equipment: We'll use a combo of internal DSP on those that have it and Driveracks on the others. We normally use only 2 JBL's for FOH but have used the other 2 when in an outside environment. Thanks, again, for all your help! Regards, RogerB
  3. Hello, What, if any, degradation in signal strength occurs in using the line outs on a Crown amp as a pass through to more amps? I'm thinking of using one Crown amp connected to the Main Out L and R of a Mackie Mixer (1604 VLZ) for 2 x 15" JBL's for FOH. I would then connect another Crown amp via the 1st amps line outs to power 2 more 15" JBL's for FOH. To that amp I'd connect a third Crown amp via the 2nd amps line outs to power 2 x 18" JBL subs. FYI, I'd power 4 X 12" JBL monitors with a fourth Crown amp connected to the Aux 1 and 2 of the Mackie Mixer. Please critique my methods/thoughts and give me any other suggestions you might provide. Regards, RogerB
  4. Dear Roger, Sorry for the delay in replying to you, I had to make sure how subsynth works before answering your questions. Subsynth preset activates a few DSP features, the sub harmonic synthesiser, a 90hz low pass filter, a bit of EQ'ing and last is signal summing, you can change the crossover frequency and add the EQ needed to flatten your specific speakers. Tuning files are downloaded to the amp and saved as a different custome preset so if you load it you wouldn't have subsynth so first load subsynth and then add the tunings manually. Dakos, Thanks for the informative reply. I'll use your suggestion and report back how the overall setting sounds. You've been very helpful! RogerB
  5. Running the 4002 at 4 ohm bridge is not recommended so your option is to use one channel for now and when you get the other sub connect it to the other channel. Definitely use the JBL tuning files but only as a starting point to configure away. By all means try to set subsynth and see, if you like it use it. As for connecting in stereo, the answer is no, you should use signal summing which is a feature your amp has. Thanks Dakos. This leads to few more questions, please. Before the questions though, I agree, bridged mode would not be good. I apologize if I gave the impression I was considering doing so. The Sub is rated @ 4 Ohms So that I understand, you are suggesting either subsynth (which is a preset) or turn DSP on and use the input mode SUM (CH1 + CH2), detailed on page 10 and 11 in the manual. If so, and I use SUM (CH1 + CH2) I'm assuming that after I load the tuning files, I'll tweak the signal with the EQ settings......correct? Page 11 mentions Subharmonic Synth, but I don't see it as part of the DSP processes on page 10. Is this the same as the subsynth preset? Sorry for the "newbie" questions. Just want to get the best sound out of the system Regards, RogerB
  6. Hello, I need input on the following: Equipment = 1, XTi 4002 and 1, JBL MRX 518s Subwoofer @ 4 Ohms I plan on acquiring another sub at a later date (not soon). How best should I configure the 4002 - a. Sub Synth or b. Stereo with the sub connected to one channel and using the internal EQ to maximize the lows, or c. Use System Architecture to maximize the Sub using the JBL files provided with. Yes, I'm new to all of this. Thanks in advance
  7. We've (the band) decided on either the 22FX or the 24.........just trying to determine if we want FX features or not. Thanks, again, for your help! Oh, I found a used IT4000 at a reasonable price, so that piece of the puzzle is solved. Regards, RogerB
  8. Hello Again Dakos, And thanks again for the quick response! Your input is greatly appreciated. We'll pursue the 4002 or used IT4000 route. It's a treat to have this forum and your expertise to help musicians who are uneducated in the Live Sound arena. Sure saves a lot of headache (and bucks) later on if the wrong equipment is purchased. Realizing this forum is about Crown Amps, would you have a suggestion on a mixer (Mackie or Peavey) that would work well with our setup.....16channel. We plan on adding a Driverack PA shortly, also. Regards, RogerB You probebly mean a budget mixer, correct? If so the I'll take you to a different company, Allen & Heath ZED series mixer, the most value for the money, best in class pre amps, a very usable noise free USB port (playback or recording) and most important as reliable as it gets. The IT4000 route is much better then the 4002 route, find one with low hours that still has some warranty left and you're all set. Dakos, Thanks for all your input. You've been a tremendous help! I'll look at the ZED series.....It all depends on what one calls a "budget mixer", lol. Regards, RogerB
  9. Hello Again Dakos, And thanks again for the quick response! Your input is greatly appreciated. We'll pursue the 4002 or used IT4000 route. It's a treat to have this forum and your expertise to help musicians who are uneducated in the Live Sound arena. Sure saves a lot of headache (and bucks) later on if the wrong equipment is purchased. Realizing this forum is about Crown Amps, would you have a suggestion on a mixer (Mackie or Peavey) that would work well with our setup.....16channel. We plan on adding a Driverack PA shortly, also. Regards, RogerB
  10. What is currently running the 518s? Hello Dakos, Thanks for the quick reply. The 518s is new, never been used. We've previously only been running the 4 JBLs through the Crown amps and the bass player was using his Fender bass amp separately. Now, with the new 518s, we'll eliminate the Fender bass amp and will run the bass through the mixer and Crown amps, using the sub to power the lows with the bass and beefing the low end for the guitars and kick drums. So the amp we buy will run the 518s. Your input on our thoughts for the XTi 2002 or your suggestion on another Crown amp is appreciated before we buy it. Hopefully, this answers your question. Regards, RogerB
  11. Hello, The Band: 6 members - Two electric guitars, one acoustic guitar, bass, drums, vocalist. The Setup: Behringer PMP 1680S powered mixer, 2 x JBL MRX 512M speakers used for FOH, 1 x JBL MRX 518S Sub, 2 x JBL JRX 112M speakers used for monitors, 1 x XTi 4002 amp, and 1 x XLS 802 amp. Playing Venues: Small clubs - 50 to 100 people. We just added the sub and would appreciate some input on what amp to purchase to power it. Presently the 4002 is running the MRX 512s and the 802 is running the JRX 112s. The bass is using his own amp. The Behringer is used as a mixer/equalizer only with the Crown amps running off the main and mono out. We are going to purchase a new mixer (Mackie) and with the new sub, the bass will run through the new mixer which will negate the need for a separate bass amp. The new mixer will also allow us to mic the drums. Our thoughts lean toward an XTi 2002, bridged, to power the sub. The feeling is this would also work if we, at a later date, add another sub. If we do, the 2002 (running in subsynth mode) will suffice for both subs. Please give me your comments, suggestions, and observations on our setup and thoughts. Regards, RogerB