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Hello to the DIY community!!!
Not sure if this is the best place to post; admin feel free to move it to where appropriate.
I picked up a DBX driverack 481(University surplus, $200!!!!) and finally got it to communicate with the ancient (just over system requirements) DELL laptop from the 90's (gift from the glassblower) that is serving as the dedicated control unit for my rig. Today I purchased euroblock connectors and balanced 1/4" plugs to build cables for connections to the amps.
I have some questions on ideal positioning of speakers. I want many opinions on this as I am a newbie/hobbyist and will be adding more and more speakers as I rebuild/refurbish them. My first project will be to set up 4 subwoofers and 2 sets of mains. This is the equipment: subs 4x Yamaha SW118IV, 2x JBL SF25, and 2x JBL SR4722( one 4722 and one 4722A). the JBL speakers have dispersion patterns of 90x50 degrees(SF25) and 100x100 degrees(4722's).
What I would like to know are any recommendations about the physical positioning of the units. This system will most probably be tested outside. My idea is that the subs will all be flush in a row and the JBLs in some configuration on top. How to best configure for maximum coherence?
Any and all suggestions are welcome!
Thanks,
Phil
Follow Ups:
What is the venue type, size and shape where these will be installed?
My second thought is why do you want to mix dissimilar two-way boxes?
They will probably never be "installed" per se. I will load them on a bus and drive out of town where i can make a lot of noise. generator power. perhaps the pawnee nat'l grasslands. where ever I can get away with it.. whaty would you do differently in a small cramped bar vs a concert hall? In regards to mixing boxes: it's what I've got!
ohh, i can't get some opinions without wasting folk's time! ok then quit wasting your own time by posting a callous reply.
Thanks to those who DID provide constructive suggestions! Unfortunately my advisor is on my ass to get some experimental results in the lab, so the experimental audio excursion will have to wait some time. I did pick up enough shielded/balanced cable, euroblock connectors, and TRS plugs to build cables to run from the driverack to my amps! One baby step at a time!
If you have enough cable, try a "quad" arrangement. 2 front, 2 rear. The effect outdoors can be very nice, since there's no mud from room resonances. Like wearing headphones, except they cover your entire body and are invisible.
Alternatively, if you have a Dolby Surround processor, try that, or maybe you can configure the Driverack to simulate one (rear = L-R plus a bunch of delay, 50 to 100 ms). (Or buy one on eBay for next to nothing if you can find one that's realistically priced.) On tracks with considerable out-of-phase content, this can be startlingly effective. For surround, the rear subs wouldn't do much, so I'd stick them up front, or feed them the same as the front subs.
Or, find some software that turns two into 4 channels and does interesting things. There's gotta be some app that can shift the sound field around, contract it to mono, expand it to enhanced stereo (something like Carver's Sonic Holography or Radio Shack's "Stereo-Wide"), maybe make it rotate.
"They will probably never be "installed" per se. I will load them on a bus and drive out of town where i can make a lot of noise. generator power. perhaps the pawnee nat'l grasslands. where ever I can get away with it.."
You asked for advice. Then you say that you're just going to take them out of town and play with them in the country.
Have fun, and stop wasting our time.
I agree, been drinkin that Colorado Coolaid! I enjoy a "Banquet" now and again, but I don't "Drink an Drive".
Vista Ultimate 64 bit/e5300 Intel 45nm cpu/ASRock G41M-LE/VIA HD Audio 7.1 channel/YamahaRX-V465 HT receiver/ Infinity RS1001 & Cambridge SoundWorks speakers/Yamaha YST-SW216 subwolf
If you are gonna use them outside simply place two subs up against each
other and place on high pac on one sub and place the tower high pac
on the other sub. Turn the outside cabinet toed "OUT"
The reason you want to do this is to avoid comb filter effects
Do this on each side
If you are outside you want to space the right and left at least 20ft
apart or more
WOW great score on that DBX driverack! Funny thing a guy gave me
a driverack PA and the behringer measurement mic for nothing last week
:)
I have not messed with it yet
I looked over the cabs you have and here is my suggestion
For inside the home use one 18 per side and put the 4722's on top
of them and biamp at anywhere from 100hz to 150hz
Using four 18's and those entry level JBL towers is overkill
You will get the best results inside with the combo above
IMHO
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