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About ronboskz650sr

  1. Eureka! By bridging my qsc and using the parallel function, I daisy-chained it to my soundcraftsmen reverse-phase adaptor and Voila! 600 bridged watts into 8 ohms to each sub. Now I have the crown running parallel input at 400 watts/channel into my 4 ohm mains for a cool 2000 watts foh. Everything is running stone cold and crystal clear! It's nice to know I can bridge the crown, just in case. Thanks for the help really helped me think through this. When you buy equipment in pawn shops because the budget requires it, every watt/dollar counts. God bless! -Ron
  2.'s my plan: I just paralleled the inputs and went back to one sub per channel. I will try this first at the next gig to see if the headroom is adequate. I will couple the subs together on the floor in front of the stage and see what we get at soundcheck. Maybe I won't need to bridge at all! Good to know it may be an option, though. Frankly, in my studio the difference is pretty dramatic, especially the comparative attenuator settings for the mains to get the balance I want. I had to drop them 12 db and bring up the mixer main fader to get the same mix I had with the amp bridged. There's still plenty of clean volume, but it's pretty obvious the extra power will matter. How much remains to be seen in the live gig. I could bridge my qsc into one sub for 600 watts and bridge my soundcraftsmen for 600 into the other, leaving the crown for mains (4 ohm mains for 400 watts each). Then I'm back to using our old beatup monitor amp..whatever it takes. God bless! -Ron
  3. Thank you. I am using a crossover freq of 60 hz, but could go higher if you think that would give me a little margin for safety. The drivers in my woofers are pyle pro (used subs, got em cheap) and no freq graph is available. The cabs are peavy sub118 hc, so I could upgrade the drivers to the original black widows later...that was the plan, but these really sound very very good. SO far, I've never driven them very low and very hard at the same time with our style of music. They sound really nice, but I guess it may be kind of a crap shoot...I do have a good backup plan to just use one sub per side in regular stereo, with reduced output to get us through if the bridged method didn't work and the amp shutdown...30 second fix not counting amp cool-down. The speakers are rated 300/600/1000... rms/program/peak...I downloaded the spec sheet, no graph. With the bridged wattage, our bass player can move items in my house with great ease ....hopefully that will translate to something useable in our typical venues. The soundcraftsmen amp puts out 900 and was very stable with the load. I could use it again and use the crown for mains and use my qsc for monitors if the stability becomes an issue. It has no attenuators, though. I really like the additional control of the crown for matching the bass levels. I am very careful to keep them both in the same spot when bridged. Thanks for the reply! Great site, BTW...very professional and helpful. God bless! -Ron
  4. Okay, I guess that was a little wordy.... Does anyone use a three unit xls402 bridged into 4 ohms as a subwoofer amp? Any problems this way? God bless! -Ron
  5. Hello! I have a question a little different than the ones I found in the search. I have an older xls402 rated 400 watts/ at 4 ohms...570 at 2 ohms, but no bridged at 4 ohm rating. I built a y cable and am powering two 8 ohm subs rated at 300 rms/600 program/1000 peak. I once built a phase reversing trs cable for an old soundcraftmen shoebox amp and it worked great, but I took some flak on another forum for doing it. The amp was rated for 2 ohm operation and I never had any trouble with it bridged this way. It is now my monitor amp and I really want the extra headroom from the crown if bridging it won't damage it. Now the other forum has some similar information about the xlz series amps. Basically one old head engineer is saying they won't handle a 4 ohm bridged load. I understand the rating for this was removed, and I understand the reason, but the spec has been posted here for our use anyway. SO my question is, who's right? Is there something I should be watching for to ensure safe reliable operation of this older amp at 4 ohms bridged? It is the three rack unit model with the "razor" front, and gorgeous blue and black paint...nice amp that I've configured and reconfigured in every concievable stereo, parallel, and bridged configuration. I also use a simple mic cable for paralleling the inputs, is there any reason not to do this? I haven't seen so much as a clip light yet. I run the attenuators the same number of clicks up from the bottom, about the 1/3 mark or 10 o'clock...the amp is not accessible to anyone but me as I run sound from the stage while we play. All my gain structure is clip-free at every stage prior to the amp as well. We play rooms seating up to about 450, use mains that are 101db efficient with 300 watts to each one from a qsc amp. They are rated 300/600/1200 rms/program/peak. The subs are 98 db efficient (300/600/1000) and we look for around 90-93db at the back wall during peaks...around 90-105 in the typical listening area for the variety of music we play...fairly dynamic, but not all that loud always. We achieved this with 900 watts on the subs via the soundcraftsmen amp, with occasional clip flicker. I would like to see if the extra 240 watts will eliminate that at the same spls. We used to use a 250 watt/channel behringer powered mixer for the mains (they are 4 ohm) problem getting the spls we needed. Please clarify a little for me. Thanks! God bless! -Ron