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About djthunder

  1. If it was me, since the SRX728's are 4 ohm cabs, I'd just run one per channel (not-bridged) on that XTi6000. Not a perfect match, but decent headroom. The SRX722 cabs are reasonably efficient, if I felt like 660 Watts RMS into each cab was going to be loud enough, I'd just run one per channel on that XTI4000 amp, but if I really wanted to try to match it for power ratings, I'd bridge that XTi4000 and run the two SRX722 cabs parallel off the single bridged channel of the XTi4000. Not a perfect x2 RMS, but a decent 1.5xRMS match. This would mean that you would be running your tops in mono, but it's the only way you'd get close to a power match with the XTi4000. Although neither alignment gives you a perfect x2 RMS for ideal headroom, also remember that when you start pushing really high power, you are not gaining all that much for your effort anyway, given the law of diminishing returns states that for every doubling of power you only gain +3dB, which in PA applications, is just enough to know the volume has changed. Hence, by my standards, the above suggestion would be just fine Anyway, that is just my humble thought on the matter, hope it helps
  2. Yes, another question about the Subharmonic Synth in the DSP of the XTI series amplifiers... This sounds like a cool feature, but I am trying to determine if I can use if safely or not. I am running a Mobile DJ setup, and I am using the XTI4000 to run my subwoofers. The drivers I am using are Peavey Low Rider subs, and have a lot of Xmax (9.6 mm, 17 mm Xlim), so they are capable of dealing with some low content, and will be installed into cabinets that will also allow low content down to about 35 Hz. However, I don't believe in being wasteful. Being that every time you go down an octave, it requires TWICE the excursion, I plan to set my low pass filter at 38 Hz, at a stiff -48dB per octave (Butterworth). With that said, I used TrueRTA to analyze some of the music content (source) to see where various music types I will be playing, hit in the Low bass. I play everything from top40, to the latest Hip Hop/R&B, techno, and so forth (and also the 50's - 2000's, country, for the weddings and so forth, but I don't plan to use the Subharmonic Synth feature for those events). A lot of the Hip Hop & R&B hits pretty low already, some having a bass line as low as around 40 Hz. Some of the tech and other music has it's bass line quite a bit higher, and I think the sub synth would be cool for those tunes, but I would assume it would be a waste for music that already has a bass line close to 40 Hz. Now, I don't want to be constantly enabling or disabling, adjusting the level and so forth on the Sub Synth throughout the night, if I am playing a mix of things. I would like to set it at a moderate level, enough for a nice effect, but not overbearing of course, and that is kind of what I am planning to do. Now that I have hopefully explained my application, here is my question: 1. If I have the HP filter set at 38 Hz, with a nice stiff -48 dB Butterworth cutoff, does that subharmonic synth ignore that cutoff? Or will that cut off prevent any subharmonics below that HPF? 2. Where would you all recommend I set the Sub Synth, for a nice deep effect, but not overbearing? (Range being from 0 to +15 dB) Thanks for your time and advice
  3. XTI4000 Input EQ vs. Output EQ

    By having two EQ sections the speaker manufactures tunings can be added into the Output EQ sections allowing you to obtain the optimum manufacture settings for the speaker. Then the Input EQ section can be used for other EQ adjustment without having to overlay them on the same graph as the speaker tunings. Now you don't have to remember which filter was from the manufacture and which one you added. Okay, that makes good sense. Basically, one could be used to "get it flat", and the other to adjust for your own preferences? Nice.
  4. Hello, I am having an XTI4000 shipped to me as I type this. I've done my homework, and this looks like a great amplifier for my needs. I've been playing around with system architect for a bit, with an XTI Crown amp loaded as the profile, and looking through the different controls (yes, I was too impatient to wait for the actual amp to get here before checkout out the software and settings in system architect). I am a bit new to DSP, I'm more used to external crossovers and EQ's with knobs to adjust, but I think I've got this thing pretty well figured out, but I don't quite understand the dual EQ going on. I see two parametric EQ's for the XTI in the software, one listed as Input EQ, which also has the Sub Synth control and is before the crossover, and another listed as Output EQ, which is also a parametric EQ, but without the Sub Synth control, which is listed as after the crossover in the chain. I am wondering what the purpose of this the "Output" EQ is? I would assume that one parametric EQ would be enough, unless somehow this second EQ, listed as the "Output EQ" must have some other kind of effect on the sound, other than what the input EQ would. I am wondering what the purpose of this second EQ, listed as the Output EQ is? And how is it different than the "Input" EQ? Thanks in advance