Phil
Senior Engineer
Posts: 178
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Post by Phil on Jun 1, 2006 20:39:36 GMT 1
Hi, I have just been told that my band is going a busk at my old school for their summer fair.
We are a trio with a drummer bass player and me on guitar and vocals. I will be using my pa but I have never done anything outdoor with my band before. I will be using 2 subs (250w) 2 tops (200w) that will be wired in parallel .3 monitor wedges (powered by a small power amp). I will be using a behringer ub1832 fx pro mixer.
I will be using 2x vocal mics 2x DI's acoustic guitar Bass amp DI out Drum mics on: Kick Snare x2 overheads
Would it be wise to use a active crossover for the FoH if i can get my hands on one.
Does anyone have any tips for me?
Thanks
Phil
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Post by ian hasell on Jun 1, 2006 22:09:50 GMT 1
Yes an active crossover could help but you should be able to get away without one, are there passive crossovers in the cabs you've already got? ;DSee I told you it's a downward spiral of buying gear as you may also need another amp after the active crossover!! ;D
Ian
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Phil
Senior Engineer
Posts: 178
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Post by Phil on Jun 1, 2006 22:55:45 GMT 1
Is a active crossover a amplified signal going in and splitting it or not. - I was told that by a teacher at school (who is a average club act/ ex DJ) ;D
If not can you get rackmount crossovers (like a one inside a speaker) which takes amplified signals or in that case would i just need to put a crossover in my subs to take out the mid/high freq. and go out to the other jack?
Thanks
Phil
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Post by ian hasell on Jun 2, 2006 8:06:35 GMT 1
An active crossover splits the signal before the amplifiers (often rack mounted) Passive crossovers are usually built into the speaker cabinets, it is rare for them to have specific output on the back of a cabinet (for other speaker cabs). There are several types of passive that are combined to produce the desired effect.
Low pass = filters off all frequencys above a predetermined frequency used for bass for instance
Hi pass = filters off all frequencys below a predetermined frequency used for tweaters for instance
Hi/Low pass = filters off all frequencys above and below a predetermined set of frequency used for mid range for instance
Ian
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Post by John Bell on Jun 2, 2006 9:52:03 GMT 1
Hi Phil, I may have misinterpreted your comments, but if your lyonforge 250w amp is mono ( as you said that you were going to wire all of your FOH cabs in parallel ), the amplifier would need to be capable of handling the 2 ohm load and the Sub's would need to have internal passive crossovers. My 18" & 15" subs, have internal passive crossovers, with speakon output sockets for the full range and mid/high cabs. John.
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Phil
Senior Engineer
Posts: 178
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Post by Phil on Jun 2, 2006 10:48:56 GMT 1
Hi John sorry I didnt put enough info in above. My FoH will be in parallel but it will be L+R so I will have a sub and top on Left channel and the same on the right. So I will be using stereo. So I think that is 4 ohm load per side.
Is there anything I should be aware of or some little tips to make the band sound better. I want to get the kick drum and the bass vibrating a bit in your stomach - which I know I wont be able to do that well because of the power and my gear but I should get a bit of that effect if I just boost the low freq. on the graphic EQ?
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Post by John Bell on Jun 2, 2006 11:19:03 GMT 1
Hi Phil, a compressor works really well on the kick, but if you don't have one, you can boost the graphic around 80hz. Don't boost below 40hz, if your subs don't extend further, or they could be damaged by excessive excursions or by overheating the voice coils. It would also waste amplifier power. It is also best to leave a bit of headroom on the kick channel, (I/P level), as the peaks often don't register on the meters, but the clipping can be heard and cause problems. You will find that it will be difficult to get any real low-end energy, with a small PA outside, so it will be a balancing act. Let the back-line do as much as it can, without being over-the-top and balance the drums and vocals to it. Above all, enjoy it and things will gradually improve with experience and more/better equipment. John.
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Phil
Senior Engineer
Posts: 178
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Post by Phil on Jun 2, 2006 20:31:25 GMT 1
Thanks for the tip. Does anyone know if you use a active crossover do both channels that have been split (high and low) stay at say 8ohm if you use 2 8 ohm speakers, rather that if they were in parallel how they would go to 4 ohm. - if that makes sence ;D I have been told this by someone but I just want some back up to be certain. I will have to be really kind to a teacher at school if he still has his active crossover that he doesnt use ;D
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Post by soundmanjim on Jun 5, 2006 18:33:44 GMT 1
yes phil. the crossover wont have any effect on the speakers. what WILL have an effect is the amp connected to them. if you are using two subs either side, 8ohms, they will be connected to one of your amps. then the other amp will be connected to the mid-high speakers. then all you do is connect the crossover to the amps, low out to the bass amp, and hi out to the mid-high speakers. are you on myspace? if so, add me, im 'soundmanjim' , im always on there!!! (if you need any more help)
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Phil
Senior Engineer
Posts: 178
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Post by Phil on Jun 5, 2006 18:52:36 GMT 1
Thanks
I am not on my space but I will get on it soonish
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Post by ian hasell on Jun 5, 2006 19:55:05 GMT 1
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Phil
Senior Engineer
Posts: 178
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Post by Phil on Jun 5, 2006 21:57:04 GMT 1
Thanks i was actually looking at getting that - once I payed off £260 det
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