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Old 31st July 2004, 06:36 PM   #1
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Location: Columbus, OH
Default Got my line array speakers and did a quick test setup

Got (32) of the Infinity speakers which are actually 6.5" drivers. I figured they were, as I've never really seen a 7" driver used by Infinity.

http://www.partsexpress.com/pe/showd...number=299-493

I also got 64 of the Onkyo tweeters:

http://www.partsexpress.com/pe/pshow...number=269-702

And I picked up 64 of the 69 cent wonders:

http://www.partsexpress.com/pe/pshow...number=269-568


For a quick and pathetic test of driver/tweeter ratio I got a cardboard box, roughly 1.25 cubic feet and mounted (2) of the Infinity drivers in it, along with (1) 3/4" Onkyo tweeter externally. I used a leftover Infinity Kappa car crossover to cross the speakers over. MY GOD. They sound UNBELIEVABLE! I A/B them to a Polk LSi7 ($400 each bookshelf) and I enjoy the mids/highs better with the cardboard box speaker! The bass isn't quite there, due to air leaks and using a cardboard box, but the vocals and mids are just...unreal...for $17! I even called my brother over and my fiancee, and both were floored with how good the cardboard box speaker sounds!

With this, I see that a 1:2 tweeter:woofer ratio sounds pretty damn good. Only problem is I'll be using (8) of the Infinity speakers in my line array, so if I went with (4) 3/4" tweeters the whole point behind having a line array will be shot. SO, should I do 4, 8, 16, 32 tweeters? In order for them to span the height of the Infinities and be mounted closely I pretty much have to go the 32 tweeter route. Then I could just build the x-over to not give much power to the tweeters, right? Guys, I'm a COMPLETE newbie to this kind of stuff so bear with me

The bass really isn't that bad, and I remember reading in another post about the Infinities that they would need roughly 3.5 ft3 of airspace per pair to get good low bass response. Is this the case? I still don't know how to read the numbers very well

Thanks a million guys, and any input is EXTREMELY appreciated! Any thoughts on how to build these speakers will help me sleep better at night. Looking at the speakers in my basement is making me pretty overwhelmed. What the hell did I get myself into?!?!
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Old 31st July 2004, 06:44 PM   #2
sqlkev is offline sqlkev  United States
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hey...go all out and go with as many mids as u can
im doing 16 of the 69cents driver per side...hope to get at least one side finish today and wire them up...

take some pics as u go along...

btw...i hope u have all the proper tools already...
doing buncha circles can be a pain in the A
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Old 31st July 2004, 10:43 PM   #3
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Quote:
SO, should I do 4, 8, 16, 32 tweeters? In order for them to span the height of the Infinities and be mounted closely I pretty much have to go the 32 tweeter route
The radiation characteristics of both the woofer and tweeter lines are dependant on their hieght, and you don't want them to be different around the crossover point, so keep both the woofer and tweeter lines as close as possible to the same hieght, with the drivers spaced as close to each other and the two lines as close to each other as you can.

1 tweeter to 2 woofers in an MTM alignment is best for a variety of reasons, but not in arrays.
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Old 31st July 2004, 11:04 PM   #4
cjd is offline cjd  United States
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Those tweeters match up almost perfectly with a single one of those 4" drivers (I have a whole pile of designs using the 4"ers, including some delightful open baffles with a buyout Audax tweet very similar to those Onkyos). As such, one tweeter per mid. For voicing reasons, I would go that way anyhow. Dipole may be worth considering also...

They like to cross just shy of 4000hz in my experience. I have a passive topology somewhere for that pairing of drivers as well if you're interested.

Have fun and let us know how it goes!

C
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Old 1st August 2004, 01:32 AM   #5
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Thanks for all the replies!

cjd, any information you can provide me is going to help me out, so please feed me the info

I think what I'm going to do first is build a set of line arrays using the 4" and 3/4" tweeters, and wait until my speaker building skills enhance before using the $8/each Infinities. With 64 of the woofers both of my brothers want me to build them a set of speakers, but they don't want them gigantic (like mine hehe) because of their spouses. Mine is a little more forgiving, and having a dedicated theatre room helps as well.

With that in mind, I think I'm going to use 8-12 of the 4" drivers. Optimally, how far off the ground should I start the drivers? I have seen some people starting them immediately and others higher up. Using less drivers, I think maybe starting them 6-12" off the ground would help. 8 drivers would be 32" high, 12 would be 48" high. Then add on another say 12" off the ground so the speakers would be 44-60" high, good in their wives books.

Another worry is how wide to make the front baffle. The smaller the better, but I don't want to sacrifice sound quality by making a really small baffle. How narrow can I make it? Also, how well will using only 8 4" speakers fair?

Tons of questions. My apologies
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Old 1st August 2004, 08:44 AM   #6
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I got mine in too the other day.

Heres a comparison of the the 4.5" and the 7"

The 4.5" has a bucking magnet for shielding, the 7" doesn't....the actual magnet looks very similar...although the voice coil looks bigger on the 7"...maybe 1" versus 3/4" on the 4.5"

Click the image to open in full size.
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Old 1st August 2004, 07:47 PM   #7
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Thanks for the pics, Hybrid fourdoor. I almost got some of the 4.5" Infinities but after seeing the price and performance on the 69 cent wonders I just stuck with those.

Now, does anyone feel like helping me out?
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Old 2nd August 2004, 10:06 AM   #8
onis_uk is offline onis_uk  United Kingdom
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does anyone know of a cheep place to buy drivers from in th uk because i really want to have ago at a line array set up
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Old 2nd August 2004, 10:23 AM   #9
sqlkev is offline sqlkev  United States
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I'm semi done with my 69c line array project...
I have mine started at 10" off the ground...
16drivers with 1/2" spacing = 72"
add another 10" on top = 92"
the baffle is 15.5" wide

4"ers playing fullrange...and 16 apex jr. tweet per side playing from 7,000hz and up..

the sound is quite satisfying..
very dynamic as expected..and not overbearing...
soundstage is incredible as well
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Old 2nd August 2004, 02:38 PM   #10
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Default Re: Got my line array speakers and did a quick test setup

Quote:
Originally posted by mazeroth
Got (32) of the Infinity speakers which are actually 6.5" drivers. I figured they were, as I've never really seen a 7" driver used by Infinity.

Haha, maybe thats why their a buyout


As far as UK speaker companies, I don't know. Do you have a PartsExpress equivalent in England? Also try searching for surplus electronic websites in your area (country). Check places like seller/reseller rating websites to see if they have any comments on them.
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