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Another Ohms and Watts Question
- Thread starter jaxstarke
- Start date
Well, thanks for all the responses everyone. I will have everything together by Wednesday night's rehearsal and we'll see how it works. I have the series wiring box already made, the 15" 300 watt 4 ohm driver will be here Monday and I have a few speaker cables coming in Wednesday afternoon. I have a feeling it will all be for naught and I'll probably end up going with the power amp option. I have the Behringer NU1000 in my sights (I know. Behringer to a lot of folks= garbage but meh, it's relatively inexpensive and they do offer a 3 year warranty so....) 300 watts at 4 ohms per channel sounds like a good plan to me.
At least enjoy the experiment if nothing else. You never know how well it will work for you till you try. I have had decent luck with Behringer's PA line of products if you wind up going that route.
And, as I said before, if you go that route, get a decent used pre-amp out of the classifieds, run those together, the rig will power both cabs easily, and sell the backline, or keep it for use when you only need to run with a smaller rig, and as a backup amp. (I'd keep it!)
I'm not sure that you are aware that the iNuke is a power amp only. The additional pre-amp unit required to run the rig handles your tone shaping, EQ, effects send/return and such.
Your Backline unit has both a preamp and power amp in it now. When you slave the signal it produces, you are basically taking the signal after it has gone through the Backline pre-amp. Some pre-amps give you an option to take the signal pre or post EQ. Post EQ would be better in that application for you. I'd have to look at its features more closely to advise you there.
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Thank you, I appreciate that. (I wish the text editor supported superscripts. I'll have to ask Paul later if it is possible to upgrade the editor at all.)
@Thor- Yes the BL 600 can be run pre or post EQ. The plan is to just use the BL 600 for the preamp and run XLR direct out, post EQ to the power amp and just run both cabs from it.
You may need to run the effects send to the power amp. The DI's voltage level may not be high enough. Just keep that in mind if the power amp's output seems low. 
If you also note B-Strings comment, then looks like you have set the rig from 'punch' to 'stun' and you looks like you got the bases covered my man!
Just got an e-mail from Luis Santoyo at GK and he said run from the FX loop to the power amp if you just want to use the Backline as a preamp. Useful bit of info for anyone wanting to do the same.
Just got back from rehearsal and the rig worked like a charm. Was actually pretty loud for only pushing 90-100 watts per cab. Nice and crisp and clean yet thunderous and floor rumbling. lol In a couple months I'll probably add a power amp but for now I think it's just fine.
Well, well, well. Just got a new Behringer NU3000 power amp. Plugged it up using the XLR out from the Backline 600 and then from the FX send and tested it. No discernible difference in output that I can tell. Think I'm going to stick with the XLR out since I have the cable now. By the way, the output ratings for these iNuke power amps posted all over the internet are all peak. NU3000 I have is actually 2100 watts at 4 ohms RMS bridged mono. 570 watts per channel @ 4 ohms stereo. 280 watts per channel @ 8 ohms stereo.
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May sound weird but I noticed this evening that the 15" cab wasn't working. Probably hasn't been working since I hooked everything up so I did a little experiment and ran a line from the XLR direct out AND one from the FX send to the 2 inputs on the power amp. Both cabs are working fine now. I wasn't aware that if you wanted to run 2 cabs you had to run two inputs.
three pages of off-topic quibbling over ohm's law, and this was the actual answer, i think; with the original head, probably not much point in losing all that power just so you can add a mis-matched, less efficient cab.
with the power amp, just switch the power amp to "mono" (not bridge!) so one input goes to both sides.
