JohnMcConnell Posted March 1, 2004 Posted March 1, 2004 Does anyone else make the first track on a minidisc a L/R 1KHz 0dB ref tone to match levels through the system and a pink noise check to do all the drivers? Very useful, same idea as a lamp check cue on the lx board Where can I get this 0dB ref tone? or is that a really silly question, that I should just record a tone @ 0dB? Pink noise??? know about white noise, whats pink? Cheers
Peter Russell Posted March 1, 2004 Posted March 1, 2004 Where can I get this 0dB ref tone? or is that a really silly question, that I should just record a tone @ 0dB?You can use a 1Khz sine wave so that everything is referenced to one level, ie. set your fader to 0db on the sound desk play the track and adjust the input gain so that the meters read 0db that way when you play at -10db on the fader it will always come out at the same level through your speakers.To create this tone either use the one bulit into your sound desk (if it has one) or you could use a tone generator or the Sound Check CD.NB don't put this through your PA system as it can damage it.Pink noise??? know about white noise, whats pink?Pink noise is a type of noise with equal energy in each octave vs white noise which has its energy distributed throughout the frequency range of audio. Pink noise more closely approximates the frequency/energy distribution of conventional music.HTH Peter :blink:
JohnMcConnell Posted March 1, 2004 Author Posted March 1, 2004 where can I get a 1kHz sine wave??Peter, thanks so far
James Posted March 1, 2004 Posted March 1, 2004 The A&H RTA (see the download section on their site) provides 100Hz 1K and 10K tone (Pluss all normal noises) James http://www.allen-heath.com/rta.asp
JohnMcConnell Posted March 1, 2004 Author Posted March 1, 2004 both of you have been really helpful, cheers
Peter Russell Posted March 2, 2004 Posted March 2, 2004 Have a look at Sound Check which is a great collection of tones and noises.Another option is either a Minirator or if that is a bit pricey for you then Behringer make a Cable Tester that has a tone generator built in.HTH Peter
JohnMcConnell Posted March 3, 2004 Author Posted March 3, 2004 Hijacking my own topic, thanks for the help BTW, What size of amplifier should be used to power speakers? I only ask because I thought that the speakers should always be a slightly higher wattage than the amp, otherwise the amp could overload/blow the speakers. However, having just got advice from some funny looking electrician, he says the amps should be bigger than the speakers installed, and I just thought that people in the industry would be able to clear up the matter for me? Our amp has just packed in an I am trying to find out what size amp to hire to run our 200W speakers for an upcoming fashion show.... Cheers
misterbassman Posted March 3, 2004 Posted March 3, 2004 An amp driven into clipping due to being too small will do more damage than slightly over powering your speakers
IanG Posted March 4, 2004 Posted March 4, 2004 Our amp has just packed in an I am trying to find out what size amp to hire to run our 200W speakers for an upcoming fashion show....I'd be looking at something that could do 400 Wpc at the impedance of your speakers. If any inexperienced operators will be using this rig, a limiter would be a good investment.
James Posted March 4, 2004 Posted March 4, 2004 It's not quite an acurate analogy but you wouldnt' worry about putting a 650W lamp on a dimmer ch that gan give 1000W If you put a 650W lamp on a 500W dimmer ch then you run the risk of popping the dimmer. Similar logic with speakers I wouldnt' want to run a 650W speaker off a500W amplifier I would much rather use a 1000W amplifier. Iappreciate this is a grosely oversimplified example but I hope it puts it in context. James
JohnMcConnell Posted March 4, 2004 Author Posted March 4, 2004 So does that mean I can run the amp at full power say, if it was 1000W and the speaker was 650W, without blowing the driver in the speaker? Or should I just run it at about 65% ? Also just looking to install a multicore into the studio, can you get multicore down which speaker signals can be sent aswell as mic lines? or do I have to keep inputs/amped outputs separate? finally for today :), is there some sensible way to set up an amp with terminals that have to have the speaker wire screwed into it so that I can rig/de-rig it often without unscrewing every 5 mins?only I had a real job trying to fit the thick speaker wire we use into a female jack socket because I was going to leave that permanently attached, but the wires didn't fit! Thanks EDIt: maybe one of the moderators should change the title to 'John's daily question' or something to stop me being accused of going :wacko: . Only covering my own back!
Brian Posted March 4, 2004 Posted March 4, 2004 So does that mean I can run the amp at full power say, if it was 1000W and the speaker was 650W, without blowing the driver in the speaker?No, run it at 65%. can you get multicore down which speaker signals can be sent aswell as mic lines?No, I'm not aware of anyone who makes such a cable and you wouldn't want to do it anyway. Too much risk of the speaker siganl getting back into the mic inputs. is there some sensible way to set up an amp with terminals that have to have the speaker wire screwed into it so that I can rig/de-rig it often without unscrewing every 5 mins?Not quite sure I understand the question but could you not make a short adaptor lead with a bit of choc-block on the end?
IanG Posted March 4, 2004 Posted March 4, 2004 finally for today , is there some sensible way to set up an amp with terminals that have to have the speaker wire screwed into it so that I can rig/de-rig it often without unscrewing every 5 mins?only I had a real job trying to fit the thick speaker wire we use into a female jack socket because I was going to leave that permanently attached, but the wires didn't fit!Assuming your amp is in a flight case, mount a 1U panel on the back and hard wire two speakon connectors to the amp (you could put a couple of XLRs on it too for inputs). Then put speakon plugs on your speaker cable and connecting them up is a simple matter of pushing and twisting!
misterbassman Posted March 4, 2004 Posted March 4, 2004 sorry Brian I would minorly disagree with your comment, I would say the amp could easily be run upto 75% because the volume controls are far from linear
Tomo Posted March 5, 2004 Posted March 5, 2004 can you get multicore down which speaker signals can be sent aswell as mic lines? Short answer: No. Longer answer:As Brian said, it's a bad idea as you will almost certainly get a significant amount of crosstalk between the high-power speaker output and the low-power mic inputs. Worst case would be getting instant feedback from your cable rather than individual mics. However, you can get multicore speaker cable and multicore mic cable.Get one of each and have fun. And misterbassman -I think Brian means running them up to 65% power o/p.Exactly where on the dial this will be depends a lot on the control behind them, but it's unlikely to be lower than 6.5 so this is a safe bet.
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