Forums Music Sound Engineering Sound System Plan: Sound Good? Re: Sound System Plan: Sound Good?

    sheffield-junglist;226625 wrote:
    Oh yeh back to the 220Hz port-tuning thing (ElRetardo sed that the mid box should be tuned to 220Hz), this is what happens when I tell WinISD that:

    Looks a bit dodgey to me (Not sayin elretardos idea was dodgey,just the graphs) Probably coz I’m not usin winisd properly but I dunno all you wise-ones take a look

    Dunno why the pics look so wierd when you click on em.

    The pics look wierd because the tuning frequency is wrong – you should tune your boxes to a value slightly higher than the Free air resonance frequency (Fs) given in the driver specs. You do this so the unnatural peak in response at resonance is damped by the air mass of the box and ports (your box response will have a steep rolloff below the tuning frequency, essentially damping the tendency to resonate inherent in the driver).

    The response curves show a box tuned way above the right frequency for the driver, resulting in a large peak in response at the tuning frequency – this is very bad (the main reason for a box in the first place is to make the response as flat as possible – your speakers and amps should be as linear as possible, meaning they should introduce as little alteration in the character of the sound reproduced as possible.)

    sheffield-junglist wrote:
    (From Xover post) Rete, basically know wot I’m doin now cept I cant figure out exactly what cables I need. Also dont know exactly wot order everythin goes in and coz these are the only problems I have for now hopefully I can kill 2 birds with 1 stone with this post!
    Heres how I think it should be done but I’m most likely wrong

    Decks>Mixer>Graphic EQ>3 amps>X-over>Bass-bin/mids/tops

    I think that the X-over might go before the amps but I’m not rete sure.
    Yeh so can people tell me
    a) Which order this shit goes in
    b) What cables I need (the only ones I know for sure are the ones that connect the decks n mixer cuz I’m just THAT useless:cry:)

    Coz I havent got a clue:crazy:


    You wire it:

    //////////////////////////////////////////// |—3–Amp—4—Bass Speakers
    \\\\\\\\\\\\\\\\\\\\\\ |
    Decks—>—-Mixer–1–EQ—2–Xover|—3–Amp—4—Mid Speakers
    \\\\\\\\\\\\\\\\\\\\\\ |
    //////////////////////////////////////////// |—3–Amp—4—Top speakers

    The Actual wires needed will need you posting the makes and models of each piece of kit – what I would generally expect to find on the equipment is:

    1) Mixer to Eq – 2 cables, one for left and one for right channel would likely be female XLR to either male XLR, or 1/4″ TRS jack (the XLR cables are wired with pins: 1=Earth, 2=Hot signal, 3=Cold signal… If wired to a TRS jack, it will be wired: T=Hot signal, R=Cold signal, S=Earth. If one end is not balanced line – likely the mixer if any, then just short the cold signal to the earth one at the non-balanced line end)
    2) Eq to X-over, again one for each channel likely female XLR to male XLR, wired as above.
    3) X-Over to amps – one stereo pair per frequency band (ie lo, mid and hi). Should be Female XLR to male XLR, but may be female XLR to 1/4″ jack – see the wiring for 1 for wiring info. You will have 3 pairs (ie 6 cables)
    4) Amps to speakers – could be various combinations depending on the amps and speakers. Basically each is a 2 core cable, with a +ve and -ve. Hopefully it’ll be speakons both ends in which case 1+ and 1- need to be connected at each speakon – ie 1+ to 1+, 1- to 1-. If you have Jacks, then the tip will be +ve, and the sleeve -ve. If XLR, pin 1 will be the -ve, and pin 2 the +ve….

    Hope that helps – if you need more help, post the makes and model numbers of each piece of kit for me and I will go and check the connectors etc…raaaraaaraaa