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About JPM.

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  1. Except for the Thermal Limiter. It says to use nominal. The wizard uses what ever you enter on all of them. But yeah, when you look at JBL specs on some drivers the Thermal Limiter is lower in comparision. 51 Volts looks like a go. Marty retired a while a go and I've been down this path before with Peavey. When you use different brands in a system no one can be sure what is right as they can't validate each others settings for their equipment. They don't always translate well over other platforms. I don't think I will mix brands next purchase. It is a lot easier to get support that way. I think it could be a case of operator error and nothing is bullet proof even with 3 limiters. I will try the Thermal at 51 volts at least as the rest of the settings seem right. Thanks for your input Avi.
  2. Bi amped sorry. The 12 inch woofer has its own amplifier channel and processing. I have looked at the nice brown voice coil. The new ones also have some brown in them but this one is way more brown and open circuit. The thermal rating is set as the guide says to. Lets say the 2 hour rating is 500 watt. Square root of (0.8 of 2 Hour Rating x Nominal Impedence). It is the first thing I'm thinking of changing with maybe less response time.
  3. Hey Avi, Its all cool. After reading through my posts I'm not quite explaining it right. Such as the 100hz to 2k bandpass could still mean a passive network etc. My config is clear in my head but I deal with it all the time. I'm still irritated that I send out systems with operators that have wireless monitoring of limiter action on all amps yet damage still occurs. Another thing is I don't like bringing brands and models into it on a public forum. It disputes advertised ratings which can be circumstance dependent. I have for example seen the Crown Itech HD specs put under scrutiny on a public forum by someone who works for another brand. I don't think that is right. Lets just deal with ratings. I have stated everything that is available. Any way, you should have a read of this. It shows how I come to some of my settings. I do not use auto mode except to set the release times. There is a limiter wizard there to but it doesn't fully follow the guide for some reason. It only deals with nominal impedence, not minimum. As for power compression, sure it has an effect but we are not talking about subs here. Its a mid driver and it really only drags down performance. It is more of a side effect of voice coils heating up but not really the cause of them burning out. But maybe accounting for it might provide the protection needed. Still, with a 3 step limiter system, do you need to allow for it? Itech HD guru may be able to answer that.
  4. No, I actually do mean thermal limiter. With respect, it's apparent you do help to a lot of people on this forum but I don't think you are able to help in this case. I'm not chasing a lesson in speakers 101 but someone with extensive Itech HD knowledge. I can tell you are not familiar with this particular amp. Thanks
  5. Sorry, I assumed you picked up that it is biamped since it was a 12 inch woofer with a bandpass of 100hz to 2K. The driver is a Peavey TC 12, rated to 500 Watt Continuous, 2000 Watt Peak, Minimum Impedence is 6.5 Ohms, Nominal Impedence is 8 Ohms. I have been entering 57 Volts for RMS Limiter, 0.193 Release and 114 Volts for Peak Limiter, 0.060 Release and 56.5 Volts for Thermal Limiter, 10 Sec response.
  6. Thanks for the reply. Speaker is a Peavey 500 watt Rms 12" woofer, 100hz to 2k. Nominal Impedence 8 ohm, min 6.5 ohms. Rms limiter @ 57volts, Peak Limiter @ 114volts attack not adjustable, release set by amp @ 0.193 sec and 0.0600 respectively. Thermal limiter setting I cant remember exactly but set using the Crown guide for setting Limiters on HD amps. It was slightly lower than the Rms limiter and 10 seconds response.
  7. Hello, I have burnt out the voice coil on some drivers using Itech HD amps. I set the limiters as per the guide on the Crown website using the speakers RMS and Peak voltage ratings. . A lot of the time I am not driving the system so I do not know exactly how it has been run. I do have my sound guy there with amp monitoring who claims it isn't flogged. Anyway, if I was to better protect my drivers from being cooked should I lower the RMS voltage or the THERMAL voltage? Thanks
  8. Hello IT5000HD is rated at 1250Watts 8 ohm, 2500 4 Ohms on the website. BTW, My manual says only 2000 Watts at 4 Ohms, what is the go with that? Anyway, If I hooked 3 x Nominal 8 Ohm Speakers to each side of the amps, what sort of power should I expect? Each 8 Ohm speaker is 500 RMS, 1000 Watts Program, 2000 Peak. Thanks Justin
  9. Hello I dont know how long it has been there but one of my IT5000hd amps has an exclamation mark sitting in the middle of the screen between the ATT levels. May have always been there. Anyone know what it means? Thanks Justin
  10. One Itech IT6000 or even better one IT8000 or IT9000HD. Itech has much better limiters and DSP than XTI series. XTI series limiters are not really useable for protecting speakers in my opinion. Justin
  11. Thanks again Kevin. Good info.
  12. Hello Just wondering about the thermal limiter. Say I have a 1200 Watt Rms, 2400 Watt Program, 4800 Watt Peak 4 Ohm Speaker. I set my RMS Limiter @ 69 Volts, Peak Limiter @ 138 Volts. What voltage should the thermal limiter be set at? Thanks Justin
  13. What are the model and brand of speakers? and why 4000 watts@ 2 ohms would be more 2000 watts@ 4 ohms but again will depend on the speaker them self. Hi Stephane 4 x 8 ohm 500 Watt rms speakers on one amp is 2000Watt rms at 2ohms. Speaker is Versarray 112 mid driver x 4. I usually double my rms value for my amp power to drive the speakers which is where 4000watts came from. What I'm wanting to confirm is that should I use the same formula using Itech amps? Something I noticed using my IT5000HD, I had attached to one side a 1400 Watt RMS 4 Ohm Sub. I set the rms limiter to 74 Volts(1400 Watts), which means the peak limiter should be set to 149 volts(5600 Watts) by default. When driving the system both the rms and peak limiters were active at high volume. The amp is rated to 2500 watts at 4 ohms but no indication it was near clipping. I thought I'd be a bit short on power. This is what got me thinking about when matching speaker power to amp power does the same formula apply when using Itech. That is, Twice your rms value of your speaker for amp power.
  14. Hello, Just want to confirm some things. I have 4 x 8 ohm drivers at 500 watt rms. So 2000 watt rms. I would need about 4000 watt at 2 ohms of amp power to power this properly, so a IT12000 hd? I would normally match 2 x rms speaker power to my amp power using my old stuff. Just checking it applies for Itech power. What is the Itech power rating? RMS or Peak? Also, at 2 ohm operation, the sound quality of Itechs is the same as 8 ohm operation? Thanks Justin
  15. Thats the prob I was having. Output was lower than the input. I will try more gain for each band pass in the X-over Dsp since signal/noise will not matter. Thanks again Kevin